JPH07100644A - Inspect member for welding - Google Patents

Abstract

PURPOSE:To form an excellent penetration bead. CONSTITUTION:An excellent penetration bead 8 si always formed by making an insert member body 5 to include a part of sulfur 0.01 to 0.03%, easily melting the insert member body 5, dissolving in complete penetration of the body 5, and forming enough molten pools on grooves 3, 4 in welding a welding base material 1, 2 and forming excellent back bead 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding insert member.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional welding insert member.

In the figure, reference numerals 1 and 2 denote weld base materials arranged in abutting relation with each other, reference numerals 3 and 4 denote grooves formed on both sides of the abutting portions of the weld base materials 1 and 2, and 5 denotes a weld base material 1. , 2 made of the same material as that of the insert member body interposed in the abutting portion of the grooves 3, 4, 6 is a welding torch arranged toward the groove 3, 7
Is a weld bead formed at the groove, and 8 is a back bead formed on the back surface side of the weld base materials 1 and 2 of the weld bead 7.

Then, by generating an arc from the welding torch 6 toward the groove 3, the welding base materials 1, 2 and the insert member body 5 are melted to form a molten pool in the groove 3, The weld base materials 1 and 2 are welded by solidifying the molten pool to form the weld beads 7 as shown by phantom lines in FIG.

When the weld base materials 1 and 2 are welded, the insert member main body 5 is inserted into the grooves 3 and 4 to melt the insert member main body 5 to promote the formation of a molten pool. A back wave 8 is formed in which the weld bead 7 reaches the back surface side of the welding base materials 1 and 2.

[0006]

However, the above-mentioned conventional welding insert member has the following problems.

That is, conventionally, the insert member body 5 is made of the same material as the welding base materials 1 and 2, but if the quality of the welding base materials 1 and 2 is improved as in recent years. However, if welding is performed simply by using the insert member main body 5 made of the same material as the welding base materials 1 and 2, a favorable back seam 8 as shown by a phantom line in FIG. 2 cannot be obtained. It was found that insufficient back seam 8 as shown by the solid line in Fig. 3 was formed, which was a cause of defective welding.

Then, when the cause of the defective welding was investigated,
The reason why the insufficient back seam 8 as shown in FIG. 3 is formed is considered to be as follows.

That is, as the quality of the welding base materials 1 and 2 improves, the content of sulfur in the material tends to decrease.
When the content of sulfur in the material becomes low, the material becomes difficult to be melted. Therefore, when the insert member main body 5 made of the same material as the welding base materials 1 and 2 is used, the insertion member main body 5 has a poor penetration. Since the melt pool does not grow, the surface tension of the melt pool greatly increases, and the melt pool in the groove 4 is pulled up to the groove 3 side. Will be enough.

In addition, if a welding failure occurs in the insert member body 5, the welding voltage is raised by a command from the welding control device that detects this, so that the welding base metal 2 is excessively melted, and the back wave 8 becomes unstable, which is a new problem.

In view of the above situation, it is an object of the present invention to provide a welding insert member capable of forming a favorable back wave.

[0012]

DISCLOSURE OF THE INVENTION The present invention is characterized in that the content of sulfur in the insert member body arranged at the groove of the welding base material is 0.01 to 0.03%. It is related to the member.

[0013]

The operation of the present invention is as follows.

The insert member body is 0.01 to 0.0
The sulfur content of 3% facilitates melting, eliminates defective penetration of the insert member body, and forms a sufficient molten pool in the groove. Is possible.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.

In the figure, reference numerals 1 and 2 denote welding base materials arranged in abutting relation with each other, 3 and 4 are grooves formed on both sides of the abutting portions of the welding base materials 1 and 2, and 5 is a groove 3. 4, an insert member body interposed in the abutting portion 4, 6 is a welding torch arranged toward the groove 3, 7 is a welding bead formed in the groove,
Reference numeral 8 denotes a back wave formed on the back surface side of the welding base materials 1 and 2 of the welding bead 7.

In the present invention, the content of sulfur in the insert member body 5 is 0.01 to 0.03%.

Next, the operation will be described.

By generating an arc from the welding torch 6 toward the groove 3, the welding base materials 1 and 2, the insert member body 5 and the like are melted to form a molten pool in the groove 3 and the molten pool. Are solidified to form the weld beads 7, so that the weld base materials 1 and 2 are welded.

Further, when the welding base materials 1 and 2 are welded, by inserting the insert member body 5 into the grooves 3 and 4,
The insert member body 5 is melted to promote the formation of a molten pool, and the back bead 8 is formed so that the welding bead 7 reaches the back surface side of the welding base materials 1 and 2.

Here, the content of sulfur in the material tends to decrease with the recent improvement in the quality of the welding base materials 1 and 2, but if the content of sulfur in the material decreases, the material Is less likely to be melted. Therefore, if the insert member body 5 made of the same material as the welding base materials 1 and 2 is used, a defective melt will not occur in the insert member body 5 and the molten pool will not grow. , The influence of the surface tension in the molten pool becomes large, and the molten pool in the groove 4 becomes the groove 3
As a result, the back wave 8 is not sufficiently formed.

Therefore, in the present invention, the content of sulfur in the insert member body 5 is set to 0.01 to 0.03.
Percentage

As a result, the insert member main body 5 is easily melted due to the influence of the sulfur content, the defective penetration of the insert member main body 5 is eliminated, and a sufficient molten pool is formed in the grooves 3 and 4. Therefore, it is possible to always form a good backwater 8 as shown in FIG.

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0026]

As described above, according to the welding insert member of the present invention, it is possible to obtain an excellent effect that a favorable back wave can be formed.

[Brief description of drawings]

FIG. 1 is a schematic side view of an embodiment of the present invention.

FIG. 2 is a schematic side view of a conventional example.

FIG. 3 is a diagram showing a state of backside defects in the case of FIG. 2;

[Explanation of symbols]

 1, 2 Welding base metal 3, 4 Groove 5 Insert member body 8 Back wave

Claims (1)

[Claims] 1. An insert member for welding, characterized in that the content of sulfur of the inserter Cg member main body arranged in the groove of the welding base material is 0.01 to 0.03%.