JP2001259830A - One-side welding method for forming groove of steel frame structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems that in conventional steel frame welding, a joint with a backing metal is a standard, in which welding is performed from one side. In this method, the manufacture of the backing metal and tack welding for mounting the backing metal, are required after working a groove. In joint welding after that, since the backing metal is stayed behind, it follows that the tack welding is stayed behind and a harmful notch bringing a stress concentration between the backing metal and a base material, is stayed behind. These become factors blocking joint perfonnance. From the standpoints of the procedure of a manufacturing process and the efficiency of joint welding, man-hours for manufacturing the steel frame are remarkably required. SOLUTION: By performing cladding by welding by a method without using the backing metal and a backing material when welding the joint and using the backing material such as copper which is not melted by a welding heat source on the end face part of the welding of members, etc., after increasing a plate thickness and a plate width, the groove is worked including the tip part of the member of the scheduled part of the joint welding and the part of the cladding by welding. In performing the joint welding, by applying the working part of the groove to a mating member, the joint is welded to the working part of the groove so that an effective throat thickness having the plate thickness and the plate width of the member or over can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welded joint member and a built-up welded portion for a building structure, a bridge structure, a general structure, etc., after performing a build-up welding on the back surface of the end face of the welded joint member. Either including the beveling, or, after performing the beveling of the member, extend the beveled surface of the welded joint member by welding overlay, and use the consumable backing metal or backing material. Is welded from one side by a one-side welding method to obtain a throat thickness exceeding the thickness and width of the member at the end face of the welded joint member.

[0002]

2. Description of the Related Art In the prior art, as shown in FIG. 1 and FIG. 2, a joint with a backing metal, which is constructed from one side, is standard for steel frame welding. In a conventional method, after forming a groove at an end portion of a member to be joined, a backing plate is manufactured and a tack welding for mounting the backing plate is performed. Therefore, joint welding cannot be performed immediately after the groove processing. Also, in the conventional method,
Since the backing is left without being removed after welding, a harmful notch remains between the member and the backing, resulting in stress concentration. For this reason, it is also a factor that causes deterioration of seismic strength and the like. In addition, in the conventional method, before the main welding, a welding bead is placed on the back surface of the steel frame diaphragm 1 in the T joint as shown in FIG. 8, or the back surface of the steel frame diaphragm 1 in the T joint and the facing member as shown in FIG. The method of placing a weld bead on the back side of the groove in advance has been published, but it is difficult to align the groove due to the dimensional tolerance of the members and the irregularity of the build-up weld bead, and the welding position is limited in order to obtain stable backside welding. There is a problem in workability. Also, unlike the circumferential welding of square pipes and round pipes where the welding start point and the end point overlap, when welding the end of the H-section steel flange, the flange width becomes a finite width,
In order to obtain good welding without defects at the beginning and end of welding, the conventional method requires steel end tabs as shown in FIG. 14, so that the production cost of the end tabs and the number of mounting steps are increased. The use of ceramic end tabs instead of the steel end tabs has recently been increasing, but also in this case, expensive production costs and mounting work of ceramics are required.

[0003]

In the conventional method, as shown in FIG. 1, two concave corners 1R and 2R are present at a root portion of a groove 5 where members 1 and 2 are in contact with a backing metal. This portion is difficult to melt and is likely to cause poor penetration. Further, as shown in FIGS. 1 and 2, after the groove 5 is processed, the back metal 3 is manufactured and the back metal is temporarily attached. 4 requires a large number of man-hours from the viewpoint of the efficiency of joint welding, and in the subsequent joint welding 6, the backing metal 3 is left alone. Harmful notches 7 and 7A, which cause stress concentration, remain between the first and second joints, which are factors that impair joint performance such as bending ductility, fatigue strength, and earthquake resistance. Further, the conventional method shown in FIGS. 1 and 2 requires a beveling process of an end face of a member to be joined, and then requires a temporary welding 4 for production of the backing metal 3 and attachment of the backing metal. Since welding 6 of the joint cannot be started immediately, there is a disadvantage that the number of man-hours for manufacturing the steel frame is increased in terms of the manufacturing process procedure. Further, in the related art, if the backing metal 3 is omitted, it is necessary to perform backside welding to form a bead having a regular waveform without defects on the back surface of the first layer from the front side of the groove. Difficulties in maintaining groove accuracy due to the dimensional accuracy of
It is difficult to secure Uranami welding skill and difficult to use large current from the first layer. Also,
Although it is possible to use a consumable backing material to form a good backside bead, this method has a problem that the consumable backing material is expensive and requires installation and removal operations. In the case where the inside is a closed space like the connection part of the building steel frame shown in FIG. 25, there is also a problem that the consumable backing material cannot be removed after welding. On the other hand, as in the construction method of FIG. 8, after the overlay welding 13 is previously placed on the member 1 which is not the end face of the T joint, the member 2 is applied, and the welding 14 of the first layer is applied from the front side of the groove. After that, joint welding 6
There is a way to do it. This method has the advantage that the backing metal can be omitted, but it has the irregularities of the build-up weld bead and the position of the build-up weld 13 is determined in advance. It is not easy to adjust and change the position, it is difficult to work if the welding posture is not horizontal, the member 1 of FIG. 8 needs a certain inclination to form the backside bead, the first layer from the back surface Welding 14 requires skill and large current cannot be used, throat thickness 2A
There is a problem that it does not lead to an increase in Further, as shown in FIG. 9, welding overlay beads 13 and 13A are previously placed on the end face member 2 in addition to the member 1 which is not the end face of the T joint, and then the member 2 is applied to the first layer from the front side of the groove. Is performed, and then the joint welding 6 is performed. This method also has the convenience of omitting the backing money, but has the same problem as that of FIG. Further, it is not easy to perform the welding when the overlay welding is performed on the tip of the member 13A of FIG. 9, and furthermore, it is necessary to previously place the overlay welding on both members of the T-joint, respectively. There is a problem of difficulty in welding work and an increase in the number of manufacturing steps as compared with overlay welding using a backing material that does not melt only on the end face members. In addition, an end tab is used for welding a finite length to a flange end of a H-shaped steel having a finite width to obtain soundness at the start end and the end of the flange. However, the production cost and the installation cost of the end tab are high. Therefore, an inexpensive and easy construction method omitting the end tab is desired.

[0004]

[Purpose] The present invention aims to reduce the number of manufacturing steps from the viewpoint of the above-described joint welding efficiency, reduce the number of steel frame manufacturing steps from the viewpoint of the manufacturing process procedure, improve the ease of position adjustment between joint members, improve welding workability, The increase in throat thickness and the elimination of harmful joint notches that cause stress concentrations between the backing metal or end tabs and the base material eliminate the impediment to joint performance by more than the joint members themselves. An object is achieved by forming a groove surface.

[0005]

In order to solve these problems, the corners at the roots of 1R and 2R in FIG. 1 are eliminated, and the production of the backing metal which requires a lot of man-hours and its temporary welding are omitted. At the same time, it is necessary to eliminate harmful notches and increase the throat thickness. Therefore, in the method according to the first aspect of the present invention, the backing metal or backing material remaining on the joint after welding is not used,
As shown in FIG. 3, a metal or nonmetal backing material 8 that is not melted by a welding heat source such as arc heat is provided on one or both end surfaces of the T-shaped welded joint member or the butt joint member before beveling. After applying the overlay welding in a predetermined shape between the back surface of the weld joint end face and the metal to increase the thickness of the member end face, the opening of the weld joint end member including the overlay weld metal is performed. Perform pre-processing so that they are on the same plane, and then
The joint members are opposed to each other, and the weld joint members are welded to each other while melting the groove of the build-up weld metal from the front side of the groove to secure a throat thickness exceeding the plate thickness of the member at the end surface of the weld joint. Perform one-sided welding. In the method according to the first aspect of the present invention, in the construction of the T-type welded joint and the butt joint, the tip end of the joint member end face portion that has been grooved after the overlay welding is set in contact with a predetermined position of the mating member. Since it is sufficient to perform joint welding to the groove processed portion as it is, the backing metal can be omitted, the ease of setting the member 2 can be obtained, and the back layer is welded to the first layer because there is support from the back surface. A large current can be used for the eyes, and a deep groove without backing metal makes it easy to obtain good penetration of the member roots 1R and 2R. 2G can be reduced to about 50% compared to about 7mm when using the backing metal, and the groove cross-section can be reduced, so the amount of welded metal in the joint can be reduced, shortening welding time and welding distortion. And a combination of these effects Reduction of steel fabrication steps from defect prevention and joint welding surface of the member root portion can be made greatly, it is possible to secure the steel dimensional accuracy. Further, in the method according to the first aspect of the present invention, the support from the back surface of the build-up welded portion is used, as shown in FIGS.
As in the above example, the welding position for performing stable backside welding in terms of welding workability is not limited to the horizontal direction, and stable work can be performed in all positions similarly to ordinary joint welding. At the same time, if the off-line work process of manufacturing and mounting the backing metal after the groove processing is omitted, and if the overlay welding is performed before the groove processing, many joint welding can be continuously performed starting from the groove processing. Therefore, the number of man-hours for steel frame manufacturing can be greatly reduced in terms of the manufacturing process procedure. In the method according to the present invention, FIG.
The notch 7 of the conventional method is eliminated, and even if a notch equivalent to the notch 7A is present, the thickness of the throat can be increased, so that the notch does not become a harmful notch, and the bending ductility and fatigue strength of the joint can be improved. Strength can be easily secured. According to the experiment, when the increase in the throat thickness was 10% or more, the bending ductility of the joint was improved about twice and the fatigue strength was improved about 10 times. In the method according to the second aspect of the present invention, instead of using a backing material that is not melted by a welding heat source such as arc heat in the method according to the first aspect of the present invention, FIGS.
As shown in A, after a predetermined shape overlay welding is performed on the back surface of the groove to be processed, which is the end of the joint member, both the member of the groove and the overlay welding metal are the same as the surface of the member. Since a predetermined groove processing is performed by cutting at an angle, a joint end face portion before joint welding similar to the first aspect as shown in FIG. 4 is obtained. Thereafter, the welded joint members are welded to each other while the weld end faces are welded from the front side of the groove with the joint end face members facing each other, and the throat thickness exceeding the plate thickness of the member at the weld joint end face is reduced. Perform one-sided welding to secure. In the method according to the second aspect of the present invention, a groove shape before welding and a joint shape at the time of completion of welding are obtained as in the method according to the first aspect of the present invention.
As in the method according to the invention of the present invention, the ease of welding workability can be reduced, the number of steps for manufacturing a steel frame can be reduced, and good joint performance can be ensured. In the method according to the third aspect of the present invention, the welding start point and the end point do not overlap each other as in the case of circumferential welding of a square pipe or a round pipe.
When welding is applied to the flange of a mold steel, the steel plate has a finite width, and when the conventional welding method using a backing plate or the method of claim 1 or 2 is applied, defects are found at the start and end of the weld. The purpose of the present invention is to provide a means for omitting the necessity of an end tab as shown in FIG. 14 or a ceramic end tab instead of the end tab as shown in FIG. According to a third aspect of the present invention, there is provided the method according to the first aspect, wherein the overlay welding is performed between the back surface of the end face of the welded joint member having a finite width and the backing material. 2
In the method described in the above, when performing overlay welding on the back surface of the groove to be grooved, which is the end of the steel plate joint member having a finite width, FIG.
5, 15A, 16, 16, 16A, 18 or 18A
After the overlay welding including the side of the steel sheet as shown in FIG.
Alternatively, as shown in FIG. 17A, the groove of the welded joint end member including the build-up weld metal of the steel plate back surface and side surface is formed to form a larger groove surface than that formed by the joint member itself, Thereafter, as shown in FIG. 5, the joint member is opposed to the groove surface including the build-up weld metal from the front side of the groove.
The weld joint members are welded together while melting 10 and the throat thickness in the plate width direction exceeding the plate thickness of the member at the end face of the weld joint or the throat thickness in the plate width direction exceeding the plate width or the plate thickness / thickness direction This is a one-side welding method that secures a throat thickness exceeding both throat thicknesses. That is, according to the present invention, after the joint is welded, as compared with the conventional backing type joint as shown in FIG.
No stress concentration due to harmful notch like 25A of 4,
In the cross section of the joint, the plate thickness and the plate width can be increased, and the in-plane tensile strength of the joint can be increased, and the bending strength, bending ductility, and fatigue strength of the joint in the thickness direction and the plate width direction can be increased. Further, it is possible to omit a steel end tab as shown in FIG. 14 and a ceramic end tab instead of this. It should be noted that welding defects may easily occur in the ceramic end tab, and the construction method according to the present invention is also effective in this respect. In the method according to the fourth aspect of the present invention, when performing the overlay welding according to the method of the first or third aspect, the non-melting backing material and the overlay welding metal have poor compatibility with the non-melting back metal. When it is necessary to perform large overlay welding to obtain the specified leg length on the material side, improve the familiarity between the non-melting backing material and the overlay metal, The present invention relates to a method for forming a smooth build-up weld bead shape between ends. The method according to claim 4 is the method according to claim 1.
Or when performing overlay welding according to the method described in 3,
As shown in FIG. 9, a thin steel plate 29 of the same material as the build-up weld metal or the welded joint member is brought into close contact with the build-up weld side of the non-fusion backing material in advance, and as shown in FIG. Material 8 and member 2
Between the steel sheet 29 and the thin steel sheet 29.
Has the effect of pulling the molten metal toward the thin steel sheet side, that is, in the direction of the non-melting backing material, by the surface tension when partially melted during overlay welding, and the smooth meat from the non-melting type backing material 8 to the member 2 This is effective for obtaining a weld bead shape 9. By this gentle overlay welding bead shape 9, the maximum overlay welding leg length on the non-melting backing material side can be obtained with the minimum overlay amount. As described above, the thin steel plate is useful for forming the shape of the overlay metal gently when it is melted, and the thickness of the thin steel plate is 3 m in consideration of the penetration at the time of welding, economical efficiency, and beveling in the post-process.
m or less is suitable and suitable. The method according to claim 5 is:
If the groove processing is performed before the overlay welding due to the manufacturing process such as outsourcing processing, the invention according to claim 1 cannot be carried out. An object of the present invention is to provide a method for increasing the groove area formed by the end face members by overlay welding using a material.
In the method according to the fifth aspect of the present invention, in a steel frame structure, arc heat or the like is welded to one or both end faces of a T-shaped welded joint member or a butt joint member which has been grooved in advance 32 as shown in FIG. Apply a backing material 8 that is not melted by a heat source,
After the build-up welding 9 is performed between the backing material and the back surface including the back surface or the side surface of the welded joint member end face portion, a part 33 of the backing material contact surface of the build-up welding metal 9 is removed from the main body. As shown in FIG. 5, the weld joint members are welded to each other while the joint members are opposed to each other and the weld-welding metal groove surface is melted from the front side of the groove as shown in FIG. Throat thickness in the plate thickness direction exceeding the plate thickness of the member at the end face of the welded joint or throat thickness in the plate width direction exceeding the plate width or both throat thicknesses in the plate thickness and plate width directions as in 6 are secured. This is a one-sided welding method. Compared with claim 1, the method according to the present invention is characterized in that a part 33 of the backing material contact surface of the build-up welding metal 9 is easily shifted from the body member joint bevel surface 32, However, it is effective as a substitute for the invention according to claim 1 for joint welding of an end face that has already been grooved. In FIG. 24, a partial vertical surface 31 of the non-melting type backing material is shown.
Is provided so that the weld overlay metal is brought into contact with the groove of the mating member and the member 2 is set for positioning in the left-right axial direction. Since the method according to the present invention is carried out in the same manner as in claim 1, it has many advantages as described above, compensating for the disadvantages of the conventional method, and has only the known diaphragm member 1 shown in FIG. The method is different from the method of overlay welding without a material, and the method is also different from the method of overlay welding on both members of FIG. 9 without a backing material.

This is a method which solves the above-mentioned problems and can achieve a part of the effects of the first aspect. Furthermore, the present invention according to claim 5 is effective in obtaining a smooth build-up shape when constructed in conjunction with claim 4.

[0007]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of conventional steel frame welding. The member 1 and the member 2 that has been grooved at 35 degrees are welded and joined by a T-joint. In order to stably weld the steel completely from one side and complete penetration, a backing metal 3 is applied from the back side and a temporary welding 4 is performed. Then, the joint welding 6 is performed as shown in FIG. However, in this case, as shown in FIG. 2, a tack weld 4 for attaching the backing metal 3 to the members 1 and 2 is required prior to the joint welding. Such work requires many man-hours, such as production of the backing plate 3, setting of the backing plate 3, and tack welding of the backing plate. Moreover, the mounting of the backing metal must be performed in the process between the processing of the groove 5 and the welding of the joint 6, and the mounting of the backing metal must be performed off-line, in a factory or on site. Smooth distribution is hindered, resulting in inefficiencies in the manufacturing process procedure. In addition, in the conventional method, after welding is completed, there are unwelded portions 7 and 7A between the backing metal 3 and the members 1 and 2 as shown in FIG. When a load is applied, it causes stress concentration. In the experiment, when the member 2 was subjected to an upward bending load 2B in the joint type shown in FIG. 2, cracks were generated at the harmful notch portions 7 or 7A and the joint was broken.

Therefore, as shown in FIG. 3, a non-metallic backing material 8 or a water-cooled or non-water-cooled copper backing material 8 which is not melted and damaged by a welding heat source is applied to the end of the member 2, and the end face of the welded joint member is provided. A build-up welding 9 is performed between the back surface of the 2T and the backing material, and the end of the member is grooved including the build-up welding as shown in FIG. Assignment, Figure 6
By performing the joint welding as described above, the various operations associated with the mounting of the backing metal described above are eliminated, and a continuous continuous operation from the groove processing to the joint welding becomes possible. Therefore, the backing metal can be omitted, the setting of the member 2 can be easily performed, the large current of the first layer can be used, and the dimensional accuracy of the steel frame can be ensured. I can do it. At the same time, the off-line work process of manufacturing and mounting the backing metal after groove processing is omitted, and many joints can be welded continuously,
The number of man-hours for steel frame manufacturing can be greatly reduced from the viewpoint of the manufacturing process procedure. Further, in the method according to the present invention, harmful notches can be eliminated, the throat thickness can be increased, and dimensional accuracy of the steel frame can be ensured. Therefore, bending ductility, fatigue strength, and earthquake resistance can be easily ensured. By significantly reducing the number of steel frame manufacturing steps by improving the efficiency of the joint welding efficiency and improving the efficiency of the manufacturing process procedure, the average work About 3mm for 25mm joint
0% reduction in manufacturing man-hours became possible. In addition, in FIG. 6, the throat thickness of the joint is 2 A when there is no overlay welding 9, but it is obtained by main welding to the groove including the overlay welding portion integrated with the base material. If the throat thickness 1A of the joint is referred to as the throat thickness according to the present invention, the throat thickness of the joint increases from 2A to 1A in the welding process according to the present invention. According to the experiment, in the conventional joint shown in FIG. 2, when the bending angle of the member 2 is 15 to 25 degrees, a crack is generated from the root portion, and in the construction according to the present invention, the same welding material as the member 1 is used. If the increase in the throat thickness of the welded joint obtained using
Even when an upward bending load 2B was applied to the member 2, the crack generation angle of the member 2 was 50 degrees or more, almost no crack was generated, and the member 2 was only bent. That is, since the throat thickness is increased in the joint according to the present invention, the joint welded portion 6 in FIG.
This indicates that the presence of some unwelded portions in the root portion 9B does not act as an adverse factor of stress concentration. In addition, the root portion 9B of the joint welded portion according to the present invention performs traverse welding by horizontal welding when the rigidity is low such as when the member 1 is thinner than the member 2, and further, the outer portion such as an H-shaped steel flange. When it is exposed, the stress concentration part can be eliminated by additional welding to the root part 9B or by grinding.
As a result, the fatigue strength of the joint can be further improved.

Embodiment 1 FIGS. 6 and 7 show an example according to the first aspect of the present invention. FIG. 6 shows an example of application to a normal T-joint.
Fig. 1 shows an example of a cross-sectional view of a joint between a square pipe column and a diaphragm in a building steel connection or the like. In the conventional method, to attach a backing metal to the inner periphery of the square pipe 11 and weld the joint,
It is necessary to remove the square pipe vertical joint for mounting the backing metal, and it takes time and effort to manufacture the pillar backing metal, align the members, and perform temporary welding. In the method according to the present invention, since the overlay welding 9 is previously performed on the end face of the square pipe, the square pipe 11 can be easily adjusted with respect to the diaphragm 12 simply by applying the square pipe 11 to the diaphragm 12, and the square pipe 11 and the diaphragm 12 can be easily adjusted. It is not necessary to adjust the gap between them and the tack welding, and the joint welding 6 can be performed immediately regardless of the welding position. FIG. 7 shows an application to a square pipe, but the same can be applied to a round pipe.

Embodiment 2 FIG. 10B shows an embodiment of the second aspect of the present invention. In the method according to the second aspect of the present invention, the build-up welding 9 having a predetermined shape is usually performed in one to three passes in advance on the back surface of the groove preparation scheduled portion 15A to be the end of the joint member.
This is an example in which the overlay welding is performed in two passes to obtain a larger overlay than the one-pass overlay, and then the member of the groove portion and the overlay weld metal are both cut at the same angle as the mating member surface. After cutting as in this example, as in the first aspect of the present invention, as shown in FIG. Also,
In FIG. 10C, after performing two-pass build-up welding larger than one pass, cutting is performed at the same angle as the included angle of the planned groove portion, and the cut surface is used as it is. By performing the two-pass build-up welding in this way, a larger groove can be obtained than in the case of one pass. Thereafter, in the example of the T joint, joint welding is performed as shown in FIG. In addition, the dimension 15A of the groove-prepared portion serving as the end portion of the joint member in FIGS. 10, 10A, 10B, and 10C is usually 0 to 500 mm.

Embodiment 3 FIG. 11 is a cross-sectional view showing an example of a conventional method of assembling a butt joint of a square pipe or a round pipe pillar which is set up vertically. Since it is difficult to adjust the gap between the pipes and adjust the groove gap, in this example, one joint has a backing metal
Using a stopper 18 and a stopper 19, the backing metal 18 temporarily attached to the upper member 16 is inserted into the lower member 17 with an inlay to perform skin matching, and the vertical position and length of the backing metal 18 and the stopper 19
The groove gap is adjusted by the vertical position of. In this conventional method, the production and accurate mounting of the backing metal and the stopper require assembling man-hours, and adjustment is difficult due to the variation in the dimensional accuracy of the pipe product. FIG. 12 is a cross-sectional view showing an example of assembling a butt joint of a square pipe or a round pipe which is vertically set in the method according to the first, second, fourth or fifth aspect of the present invention. As is obvious from FIG. 12, even if there is a slight difference between the two members, the gap and the gap between the members are kept constant only by abutting the two members, and as shown in FIG. The penetration and the thickness of the throat exceeding the thickness of the member are easily ensured. In this case, if it is only necessary to stably secure a throat thickness about the thickness of the member, the overlay welding 22 in FIG. 13 can be reduced or omitted. In addition, this construction example can be easily applied not only to construction but also to stable welding construction from outside or inside of pipelines and penstocks, and it is effective for securing the strength and quality of the joint and reducing the number of manufacturing steps. is there.

Embodiment 4 FIG. 25 shows a diaphragm 12 of a building steel connection part according to a conventional method.
And a square pipe column 11, and the diaphragm 12 and H
An example of a joint with a mold steel flange 26 is shown. All joints use backing metal and tack welding frequently. In FIG. 26, FIG.
A case where the joint welding 6 is applied to the same joint as in the method according to claim 1, 2, 4, or 5 of the present invention will be described. In FIG. 26, in the welding of the diaphragm 12 and the square pipe 11, there is shown a situation in which the invention according to claim 1, 2, or 5 is applied, there is no backing metal and tack welding, and there is no deep penetration and no harmful notch. ing. Also, in FIG. 25, a scallop, a backing metal, and a temporary welding, which are large openings, are shown in the joint between the diaphragm 12 and the H-shaped steel flange 26. However, in FIG. In the joint with the above, the overlay welding 9 is performed by the method according to the invention of claim 1, 2, 4, or 5, and the state immediately before the joint welding 6 is performed is shown, and the dotted line shows the joint of the connection part. The weld 6 and the to-be-welded portion 27A of the non-scallop web are shown. In this case, FIG. 26 shows a state in which there is no backing metal and no tack welding for attaching the backing metal, there is no deep penetration and no harmful notch, and no scallops are shown. Therefore, by the method according to the present invention, the joint of the H-shaped steel beam at the steel connection can be easily constructed by the non-scallop method. In the example of the conventional method in FIG. 25, if the scallops are eliminated, special measures such as using two backing plates on both sides of the web 27 are required. In the embodiment according to the present invention, the backing plates and the scallops are not used. It is unnecessary, and is excellent in terms of joint safety and reduction of manufacturing man-hours.

Embodiment 5 In the method according to any one of the first to fourth aspects of the present invention, as a welding material used for a weld overlay 9 to be constructed between the non-melting backing material 8 and the joint end member 2 shown in FIG. However, if a welding material having a lower strength than the joint end member 2 is used, the tensile strength of the joint weld 6 is ensured and the stress concentration is relaxed by dispersing the plastic strain, thereby improving the bending ductility and the fatigue strength of the welded joint. Helped.

Embodiment 6 In the method according to any one of the first to fourth aspects of the present invention, as shown in FIG. 6, the welded joint members 1 and 2 are welded while melting the weld-welded metal groove surface 10 from the front side of the groove. In this case, if a welding material having a lower strength than the welding joint members 1 and 2 is used for welding the root portion of the welding joint, that is, the first layer, cracking susceptibility in the root portion can be reduced, The use of a welding material having a higher strength than the welded joint member improved the strength of the root portion, and all were more effective in improving the bending ductility and fatigue strength of the welded joint.

Embodiment 7 In the method according to any one of claims 1 to 5 of the present invention, when the groove is machined together with the welding member 2 and the build-up welding 9 as shown in FIG. When the groove is formed so as to form a curved surface having a radius of curvature of 1 to 5 mm on the groove bottom 34, the groove bottom 34 is widened and deep penetration at the root portion of the joint weld 6 shown in FIG. Was effective.

[0016]

The effects of the present invention are as follows as compared with the conventional method. (1) The need for a backing metal and its tack welding, which tend to cause stress concentration and welding defects and reduce welding efficiency, is eliminated. 2 The throat thickness can be larger than the member plate thickness, and harmful notches and stress concentration due to the use of backing metal are effectively eliminated,
A more secure joint in terms of bending ductility, fatigue strength and earthquake resistance. 3 There is no backing metal, the groove depth is large, and deep penetration can be obtained, so that defects in the root part are unlikely to occur, and the groove cross-sectional area is reduced by about 20%, so the welding man-hour is greatly reduced. You. (4) Just by applying the member 2 whose build-up is welded to the end to the member 1, the mounting position can be easily adjusted and the dimensional accuracy can be easily secured. 5. Backing material such as copper for overlay welding is non-melting and non-consumable, and wastes less resources. 6 In the construction method according to the present invention, in which the welding is carried out and then the groove is formed together with the member and the joint is welded, the various operations involved in mounting the backing metal are eliminated, and the process from the groove forming to the joint welding is consistent. Continuous work becomes possible, and the efficiency of the joint welding efficiency is improved and the manufacturing process procedure is made more efficient, thereby greatly reducing the number of steel frame manufacturing steps. 7 Since the groove processing is performed together with the member after the build-up welding is performed, a groove surface including the member and the build-up welded portion can be obtained with high precision, which is effective in preventing joint welding defects. 8 When the overlay is welded including the back and side surfaces of the steel plate and the groove is processed including the overlay, the end tab becomes unnecessary,
At the same time, the throat thickness in the plate thickness direction exceeding the plate thickness of the member or the throat thickness in the plate width direction exceeding the member plate width or the throat thickness exceeding both the plate thickness and the plate width in the plate width direction is secured, and the tensile strength, bending strength,
Improved fatigue strength is obtained. 9 When a thin steel sheet is applied in close contact with the non-melting backing material and a weld overlay is applied between the non-melting backing material, the thin steel sheet and a member such as a flange, a smoother overlay welding bead is obtained. Efficiency such as reduction of the welding amount of the weld overlay can be achieved. 10 In the conventional method, it was necessary to remove the vertical seam weld bead on the inner surface of the square pipe in order to attach the backing metal to the inner surface of the square pipe. However, in the overlay welding according to the present invention, the vertical seam weld bead of the square pipe or the like was used. It is not necessary to remove it, which is effective for reducing man-hours. 11 It can be easily applied to the non-scallop construction method with high seismic strength.

[Brief description of the drawings]

FIG. 1 is an example of a sectional view of a conventional joint shape before one-side welding is performed.

FIG. 2 is an example of a cross-sectional view of a conventional joint after performing one-side welding.

FIG. 3 is an example of a cross-sectional view in which a water-cooled or non-water-cooled copper formwork is applied to a member end portion by overlay welding.

FIG. 4 is a cross-sectional view of a state in which a build-up welding is performed on a member end portion and a groove is formed on both the member end portion and the build-up welded portion, and a member 2 is shown upside down from FIG.

FIG. 5 is a cross-sectional view showing a state in which overlay welding and beveling are performed on a member end and the member is applied to a mating member.

FIG. 6 is a cross-sectional view showing a state in which overlay welding and beveling are performed on a member end portion and a contact welding is performed on a mating member.

FIG. 7 is a sectional view of a steel frame welding example according to the present invention in which a square pipe column is welded to a diaphragm.

FIG. 8 is a cross-sectional view showing a one-side welding method in which build-up welding is performed in advance on the back surface of a member such as a diaphragm of a T-joint, which is to be jointed, and both members of the T-joint are back-welded from one side.

FIG. 9 is a one-side welding method in which both the T-joint members are back-welded from one side by overlay welding to both the back surface of a joint such as a diaphragm of a T-joint and a back surface of a grooved joint end surface. FIG.

FIG. 10 is a cross-sectional view in which one-pass build-up welding is performed on a member groove portion and a member and a build-up welded portion are cut together.

FIG. 10A is a cross-sectional view in which one-pass build-up welding is performed on a member groove portion and a member and a build-up weld portion are both grooved.

FIG. 10B is a cross-sectional view in which the member and the welded portion are cut together by two-pass build-up welding on the member groove portion.

FIG. 10C is a cross-sectional view in which both the member and the build-up weld are bevel-processed by two-pass build-up welding on the member bevel expected portion.

FIG. 11 is a cross-sectional view of an example of a conventional method for assembling a butt joint of a square pipe or a round pipe pillar set up vertically.

FIG. 12 is a cross-sectional view of an example of an assembly according to the present invention of a butt joint of a square pipe or a round pipe pillar set up vertically.

FIG. 13 is a cross-sectional view of an example of a welding work according to the present invention for a butt joint of a square pipe or a round pipe pillar set up vertically.

[FIG. 14] An example of installation of an end tab by a conventional method for a column-column joint.

FIG. 15 is a construction drawing of overlay welding between the back and side surfaces of the end face of a steel plate welded joint member having a finite width and a non-melting backing metal.

FIG. 15A is a construction view of overlay welding between the back and side surfaces of the end face of a welded joint member of a finite width steel plate and two non-melting backing metals 8;

FIG. 16 is an external view of a welded joint between a non-fusible backing metal and a back surface and a side surface of a welded member end portion of a finite width steel sheet welding member.

FIG. 16A is an external view of a finite-width H-shaped steel flange welded joint member after the build-up welding has been performed between the back and side surfaces of the end face of the joint member and the non-melting backing metal.

FIG. 17 is a diagram showing a case in which build-up welding is performed between the back surface and the side surface of the end face portion of the finite width steel plate welding joint member and the non-melting backing metal;
External view when beveling is performed

FIG. 17A is an external view of a case in which a beveling process is performed after performing build-up welding between the back surface and the side surface of the end face portion of the flange welding joint member having a finite width and the non-melting backing metal.

FIG. 18: Overlay welding to a finite width steel plate weld joint

FIG. 18A: Overlay welding to a finite width steel plate welded joint using a non-melting backing material

FIG. 19 shows a state in which a thin steel sheet is applied to the overlay welding side of a non-melting backing material and set together with the member 2

FIG. 20 shows a state in which a thin steel sheet is applied to the overlay welding side of the unmelted backing material and overlay welding is performed together with the member 2.

[FIG. 21] After a thin steel sheet is applied to the overlay welding side of a non-melting backing material and overlay welding is performed together with the member 2, the non-melting backing material is removed, and a groove including a weld overlay is formed. Sectional view showing the processing position for

FIG. 22: After applying a thin steel sheet to the overlay welding side of the unmelted backing material and overlay welding together with the member 2, the non-melting backing material is removed, and the groove including the overlay welding portion is removed. Cross section

FIG. 23 is a cross-sectional view in which a thin steel sheet is applied to the build-up welding side of an unfused backing material, build-up welding is performed together with the member 2, a groove including a build-up weld is formed, and a joint is welded.

FIG. 24 is a cross-sectional view showing that a non-melting backing material is applied by overlaid welding to the end face of a grooved joint member;

FIG. 25 shows an example of a column / diaphragm and a diaphragm / beam welded portion of a connection part of a building by a conventional method.

FIG. 26 is an example of a welded portion of a column / diaphragm and a diaphragm / beam of a building connection part according to the present invention.

FIG. 27 is a cross-sectional view showing a state in which a welded portion is welded to the end of the member, and both the end portion of the member and the welded portion are grooved on a curved surface.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Joining welding member, for example, a column of a steel frame of a building, a diaphragm of a connection part, etc. 1A Throat thickness of joint welding 6 in FIG. 6 2 Welding member scheduled to be grooved or performed 2A Plate thickness t of member 2 Throat thickness of joint welding in FIG. 2 2B Upward load or bending moment 2G T-shaped welding groove gap at back surface position of T-shaped welding joint member 2T End surface of T-shaped welding joint member 2 before groove processing 2W H-shaped steel member 3 Backing metal 4 Temporary welding of backing metal 5 Groove 6 Joint welding 7 Stress concentration part due to notch on T-joint end face member side 7A Stress concentration part due to notch on T joint member surface side 8 Welding heat source Backing material which is not melted by the above, that is, non-melting backing material. For example, a water-cooled or non-water-cooled copper backing metal, or a carbon plate 9 Overlay welding 9B Root portion 10 Groove-worked surface where both the joint end face member and the overlaid weld are grooved 11 Square pipe column 12 Diaphragm 13 Overlay welding performed on the surface side of the T-joint member 13A Overlay welding performed on the end member side surface of the T-joint 14 Uranami welding 15 Overlay welding is performed on the planned groove portion of the member, and the member and the overlaid weld portion are formed. Surface cut together 15A Groove to-be-processed portion to be the end of joint member 16 Upper member of square pipe column or round pipe column 17 Lower member of square pipe column or round pipe column 18 Conventional upper backing metal 19 Conventional method Lower stopper 20 of the upper backing attached to the upper member tack welding 21 of the lower stopper 19 attached to the lower member 22 welding welding built up on the upper member before beveling 23 Weld build-up applied to part members before beveling 24 Lateral joint welding 25 End tab 25A Notch generated due to gap between member and end tab 26 H-shaped steel flange 27 H-shaped steel web 27A Non-scallop scheduled welding portion 28 Scallop 28A Column / web Scallop welding 29 Thin steel plate 30 Groove processing line 31 Vertical surface formed on a part of non-melting backing material 32 Groove formed on member 33 Non-melting backing material contact of overlay weld metal Part of surface 34 Groove bottom

Claims (5)

[Claims] In a steel structure, a backing material that is not melted by a welding heat source is applied to an end face of a T-shaped welded joint member or one or both end faces of a butt joint member, and a back surface of the welded joint member end face and the backing material are provided. After performing the build-up welding between and, performing the groove processing of the weld joint end face member including the build-up weld metal,
Thereafter, the welding members are welded to each other while the welding members are melted from the front side of the groove, with the joint members facing each other, and the welded joint members are welded to each other, and in the thickness direction exceeding the plate thickness of the members at the end surfaces of the welded joints. One-sided welding method to ensure throat thickness. 2. The method according to claim 1, wherein, instead of using a backing material that is not melted by a welding heat source, after overlay welding is performed on a back surface of a groove to be processed, which is an end of the joint member.
The member of the groove portion and the build-up weld metal are cut together to perform the groove processing, and thereafter, the joint members are opposed to each other and the welding is performed while melting the groove of the build-up weld metal from the front side of the groove. A one-side welding method in which joint members are welded to each other to secure a throat thickness in a thickness direction exceeding a plate thickness of a member at a weld joint end face. 3. The method according to claim 1, wherein the overlay welding is performed between the back surface of the end face of the welded joint member having a finite width and the backing material. When overlay welding is performed on the back surface of the groove to be processed to be the end portion of the steel plate joint member having a finite width, after overlay welding including the steel sheet side surface, the overlay welding metal on the steel plate rear surface portion and the side surface portion is formed. Welding of the weld joint end face member is performed, and thereafter, the welded joint members are welded to each other while facing the joint members and melting the bead weld metal groove face from the front side of the groove. A one-side welding method for securing a throat thickness in a plate thickness direction exceeding a plate thickness of a member at an end face portion or a throat thickness in a plate width direction exceeding a plate width or both throat thicknesses in both a plate thickness and a plate width direction. 4. A backing material that is not melted by a welding heat source when a build-up welding is performed between a back surface of an end face of a welded joint member and the backing material according to the method of claim 1 or 3. A thin steel sheet of the same material as the build-up weld metal or the weld joint member is applied in close contact with the build-up welding side, and after the build-up welding is performed while melting the thin steel sheet, the weld joint end face including the build-up weld metal is included. The groove processing of the member is performed, and thereafter, the welded joint members are welded to each other while the welded metal groove surface of the overlay is welded from the front side of the groove with the joint members facing each other. A one-side welding method for securing a throat thickness in a thickness direction exceeding a plate thickness or a throat thickness in a plate width direction exceeding a plate width or a throat thickness exceeding both of the thickness in the plate thickness direction and the width direction. 5. In a steel structure, a backing material which is not melted by a welding heat source is applied to one or both end surfaces of a grooved T-shaped welded joint member or a butt joint member, and a back surface of an end surface of the welded joint member. Alternatively, overlay welding is performed between the back surface including the side surface and the backing material, and a part of the backing material contact surface of the overlay welding metal is set as an extension of the body joint groove, and thereafter, the joint member The welded joint members are welded to each other while melting the bead weld metal groove surface from the front side of the groove with the groove facing, and the throat thickness or the plate width in the plate thickness direction exceeding the plate thickness of the member at the weld joint end face portion is increased. A one-sided welding method that secures a throat thickness exceeding the throat thickness in the plate width direction or both in the plate thickness direction and the plate width direction.