JP2009107178A - Structure of laser welding part and laser welding method - Google Patents

Structure of laser welding part and laser welding method Download PDF

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Publication number
JP2009107178A
JP2009107178A JP2007280537A JP2007280537A JP2009107178A JP 2009107178 A JP2009107178 A JP 2009107178A JP 2007280537 A JP2007280537 A JP 2007280537A JP 2007280537 A JP2007280537 A JP 2007280537A JP 2009107178 A JP2009107178 A JP 2009107178A
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laser welding
baffle plate
tip surface
wall
bent
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JP4935625B2 (en
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Tetsuya Kuno
哲也 久野
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Toyota Boshoku Corp
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Toyota Boshoku Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1635—Laser beams characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. laser transmission welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/114—Single butt joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/124—Tongue and groove joints
    • B29C66/1244—Tongue and groove joints characterised by the male part, i.e. the part comprising the tongue
    • B29C66/12441—Tongue and groove joints characterised by the male part, i.e. the part comprising the tongue being a single wall
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/343—Making tension-free or wrinkle-free joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/344—Stretching or tensioning the joint area during joining
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
    • B29C66/53461—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/542—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles joining hollow covers or hollow bottoms to open ends of container bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/61—Joining from or joining on the inside
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1696—Laser beams making use of masks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/434—Joining substantially flat articles for forming corner connections, fork connections or cross connections
    • B29C66/4344—Joining substantially flat articles for forming fork connections, e.g. for making Y-shaped pieces
    • B29C66/43441—Joining substantially flat articles for forming fork connections, e.g. for making Y-shaped pieces with two right angles, e.g. for making T-shaped pieces, H-shaped pieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/748—Machines or parts thereof not otherwise provided for
    • B29L2031/749—Motors

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Toxicology (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To realize the crack-free and strong welding of a second member to the tip surface of the projected wall of a first member. <P>SOLUTION: A baffle plate 14 is joined to the tip surface 13a of the projected wall 13 provided on a cylinder head cover 12 by being pressurized at positions outside from the positions corresponding to the tip surface 13a of the projected wall 13. Under the state, by irradiating the tip surface 13a of the projected wall 13 with laser beams L through the baffle plate 14, the baffle plate 14 is welded to the tip surface 13a of the projected wall 13 under the condition that flexible parts 23 composing of recessed parts or stepped parts, which are more easily flexible than other portion, are provided at a portion between a joining position corresponding to the tip surface 13a of the projected wall 13 in the baffle plate 14 and pressurizing positions outside the joining position. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

この発明は、例えばエンジンのシリンダヘッドカバー内にバッフルプレートをレーザ溶着する場合等に適用されるレーザ溶着部の構造及びレーザ溶着方法に関するものである。   The present invention relates to a structure of a laser welding portion and a laser welding method applied when, for example, a baffle plate is laser welded in a cylinder head cover of an engine.

従来、この種のレーザ溶着方法として、特許文献１に記載されている技術がある。この特許文献１の技術は、相互に溶着される２つの合成樹脂材の一方を透過するレーザ光によって両合成樹脂材を溶着させるものである。そして、一方の合成樹脂材に突条を設けて、両合成樹脂材間の初期面圧を向上させ、これによって溶着部にボイド等の欠陥が生じないようにすることを意図している。しかしながら、レーザ溶着方法においては、溶着時に両合成樹脂材に対して密着方向への加圧力を付与する必要があるが、加圧力を付与する加圧部材がレーザ光の照射の邪魔にならないように、その加圧部材をレーザ光照射領域の外側に配置する必要がある。このため、従来は以下に述べるような問題点が存在する。   Conventionally, as this type of laser welding method, there is a technique described in Patent Document 1. The technique of this patent document 1 welds both synthetic resin materials with the laser beam which permeate | transmits one of the two synthetic resin materials welded mutually. Then, it is intended to provide a protrusion on one synthetic resin material to improve the initial surface pressure between the two synthetic resin materials, thereby preventing the occurrence of defects such as voids in the welded portion. However, in the laser welding method, it is necessary to apply a pressing force in the adhesion direction to both synthetic resin materials at the time of welding, but the pressurizing member that applies the pressing force does not interfere with laser light irradiation. The pressurizing member needs to be disposed outside the laser light irradiation region. For this reason, there are conventional problems as described below.

すなわち、図７（ａ）〜（ｃ）は、合成樹脂製のシリンダヘッドカバー３１と、その内側に配置される同じく合成樹脂製のバッフルプレート３３との溶着方法を示している。そして、シリンダヘッドカバー３１の内側面に突壁３２が形成され、この突壁３２の先端面３２ａにバッフルプレート３３が溶着されている。バッフルプレート３３と突壁３２とシリンダヘッドカバー３１の頂壁との間には、ブローバイガスから潤滑オイルを分離するためのオイルセパレート室等が区画形成されている。   7A to 7C show a method of welding a cylinder head cover 31 made of a synthetic resin and a baffle plate 33 made of the same synthetic resin disposed inside the cylinder head cover 31. A projecting wall 32 is formed on the inner surface of the cylinder head cover 31, and a baffle plate 33 is welded to the tip end surface 32 a of the projecting wall 32. Between the baffle plate 33, the projecting wall 32, and the top wall of the cylinder head cover 31, an oil separation chamber for separating lubricating oil from blow-by gas is defined.

この従来構造の溶着時には、図７（ａ）（ｂ）に示すように、シリンダヘッドカバー３１が上下を逆にした状態で治具３４上に載置され、その突壁３２の先端面３２ａにバッフルプレート３３が配置される。バッフルプレート３３は、溶着が適切に行われるように加圧部材３５により加圧されるが、このとき、加圧部材３５はレーザ光の照射領域を避けて突壁３２の先端面３２ａと対応する位置よりも外側の位置を加圧する。このため、バッフルプレート３３は突壁３２の先端面３２ａに圧接されるが、加圧位置が前記先端面３２ａの外側であるため、バッフルプレート３３は突壁３２の先端面３２ａの角部を起点として撓曲される。そして、この状態で、バッフルプレート３３を透過して突壁３２の先端面３２ａにレーザ光Ｌが照射されることにより、突壁３２の先端面３２ａにバッフルプレート３３が溶着される。
特開２００５−２８８９３４号公報 At the time of welding of this conventional structure, as shown in FIGS. 7A and 7B, the cylinder head cover 31 is placed on the jig 34 in an upside down state, and the baffle is placed on the tip surface 32a of the protruding wall 32. A plate 33 is arranged. The baffle plate 33 is pressed by the pressing member 35 so that the welding is appropriately performed. At this time, the pressing member 35 corresponds to the tip surface 32a of the protruding wall 32 while avoiding the irradiation region of the laser beam. Pressurize the position outside the position. For this reason, the baffle plate 33 is pressed against the distal end surface 32a of the projecting wall 32. However, since the pressing position is outside the distal end surface 32a, the baffle plate 33 starts from the corner of the distal end surface 32a of the projecting wall 32. Bend as In this state, the baffle plate 33 is welded to the distal end surface 32 a of the projecting wall 32 by passing through the baffle plate 33 and irradiating the distal end surface 32 a of the projecting wall 32 with the laser light L.
JP 2005-288934 A

以上のように、レーザ溶着に際してバッフルプレート３３が突壁３２の先端面３２ａの角部の位置から撓曲される。このため、溶着終了にともない、加圧部材３５による加圧が解除されて、図７（ｂ）に示すように、バッフルプレート３３が撓曲状態から平板状態に復元されたとき、突壁３２の先端面３２ａとバッフルプレート３３との溶着部３６には剥離方向の力が作用する。このため、図７（ｃ）に示すように、溶着部３６の両端縁に亀裂Ｋが発生して、溶着強度が低下するおそれがあった。そして、このような亀裂Ｋが発生した場合、場合によっては２カ所の亀裂Ｋが連続してしまい、両端縁間に跨る細隙が形成されることもある。このように細隙が形成された場合は、溶着強度がさらに低下するばかりでなく、例えば図７（ａ）〜（ｃ）において、突壁３２を介した左右の空間の間に圧力差が必要であっても、その圧力差を保つことができず、構造物としての本来の機能が損なわれるおそれもあった。   As described above, at the time of laser welding, the baffle plate 33 is bent from the position of the corner of the front end surface 32a of the protruding wall 32. For this reason, when the pressurization by the pressurizing member 35 is released along with the end of the welding and the baffle plate 33 is restored from the bent state to the flat plate state as shown in FIG. A force in the peeling direction acts on the welded portion 36 between the distal end surface 32 a and the baffle plate 33. For this reason, as shown in FIG.7 (c), there existed a possibility that the crack K might generate | occur | produce in the both-ends edge of the welding part 36, and welding strength might fall. And when such a crack K generate | occur | produces, the crack K of two places will continue in some cases, and the slit which straddles between both edges may be formed. When the slits are formed in this way, not only the welding strength is further reduced, but also, for example, in FIGS. 7A to 7C, a pressure difference is required between the left and right spaces via the protruding wall 32. However, the pressure difference cannot be maintained, and the original function as a structure may be impaired.

この発明は、このような従来の技術に存在する問題点に着目してなされたものである。その目的は、第１の部材の突壁の先端面に対して第２の部材を、亀裂が生じることなく堅固に溶着することができるレーザ溶着部の構造を提供することにある。   The present invention has been made paying attention to such problems existing in the prior art. An object of the present invention is to provide a structure of a laser welded portion capable of firmly welding the second member to the front end surface of the protruding wall of the first member without causing a crack.

上記の目的を達成するために、請求項１の発明においては、第１の部材に設けられた突壁の先端面に対して、板状をなすとともに、レーザ光透過性を有する第２の部材をレーザ溶着させたレーザ溶着部の構造において、前記第２の部材における突壁の先端面対する接合位置から外側に離隔した位置には、他の部分よりも撓みやすい撓曲部を設けたことを特徴とする。   In order to achieve the above object, according to the first aspect of the present invention, the second member has a plate shape with respect to the front end surface of the protruding wall provided on the first member and has laser beam transparency. In the structure of the laser welded portion in which laser welding is performed, a bending portion that is more flexible than other portions is provided at a position spaced outward from the joining position with respect to the tip surface of the protruding wall in the second member. Features.

請求項２の発明においては、前記撓曲部は、薄肉部であることを特徴とする。
請求項３の発明においては、前記撓曲部は、段差部であることを特徴とする。
請求項４の発明においては、前記撓曲部は、応力集中抑制構造を有することを特徴とする。 The invention according to claim 2 is characterized in that the bent portion is a thin portion.
The invention according to claim 3 is characterized in that the bent portion is a stepped portion.
According to a fourth aspect of the present invention, the bent portion has a stress concentration suppressing structure.

請求項５の発明においては、第１の部材がシリンダヘッドカバー、第２の部材がそのシリンダヘッドカバーの内側に固定されるバッフルプレートであって、それらの両部材の間にブローバイガスから潤滑オイルを分離するためのオイルセパレート室が形成されていることを特徴とする。   In the invention of claim 5, the first member is a cylinder head cover, and the second member is a baffle plate fixed to the inside of the cylinder head cover, and the lubricating oil is separated from the blow-by gas between the two members. An oil separation chamber is formed for this purpose.

請求項６の発明においては、請求項１〜５のうちのいずれか１項に記載のレーザ溶着部の構造において、第１の部材に設けられた突壁の先端面に対して、第２の部材における撓曲部間の位置を接合した状態で、前記撓曲部よりも外側の位置において第２の部材を前記接合方向に加圧し、この状態で第２の部材を透過して突壁の先端面にレーザ光を照射することにより、突壁の先端面に第２の部材を溶着させることを特徴とする。なお、ここで、撓曲部よりも外側の位置とは、撓曲部の外側の位置だけではなく、撓曲部の位置も含むものとする。   According to a sixth aspect of the present invention, in the structure of the laser welding portion according to any one of the first to fifth aspects, the second surface of the projecting wall provided in the first member is In a state where the positions between the bent portions of the member are joined, the second member is pressurized in the joining direction at a position outside the bent portion, and in this state, the second member is transmitted through the second wall. The second member is welded to the distal end surface of the protruding wall by irradiating the distal end surface with laser light. Here, the position outside the bent portion includes not only the position outside the bent portion but also the position of the bent portion.

従って、この発明においては、レーザ溶着に際して第２部材が第１の部材の突壁の先端面に対する接合位置の外側の加圧位置において加圧されたとき、第２の部材が接合位置から離隔した撓曲部を中心に撓曲される。このため、レーザ溶着後に加圧が解除されて、第２の部材が撓曲状態から平板状態に復元される際に、突壁の先端面と第２の部材との間の溶着部に剥離方向への力が作用することはない。よって、溶着部に亀裂が生じるおそれを防止することができる。   Therefore, in the present invention, when the second member is pressed at the pressurizing position outside the joining position with respect to the front end surface of the first member during laser welding, the second member is separated from the joining position. It is bent around the bent portion. For this reason, when the pressure is released after laser welding and the second member is restored from the bent state to the flat plate state, the peeling direction is applied to the welded portion between the tip surface of the protruding wall and the second member. The force on is never applied. Therefore, it is possible to prevent the possibility of cracks in the welded portion.

以上のように、この発明によれば、第１の部材の突壁の先端面に対して第２の部材を、亀裂が生じることなく堅固に溶着することができるという効果を発揮する。   As described above, according to the present invention, it is possible to firmly weld the second member to the tip surface of the protruding wall of the first member without causing a crack.

（第１実施形態）
以下に、この発明の第１実施形態を、図１〜図３に基づいて説明する。
図１に示すように、この第１実施形態においては、エンジンのシリンダブロック（図示しない）上に固定されたシリンダヘッド１１上に、合成樹脂製の第１の部材としてのシリンダヘッドカバー１２が装着されている。シリンダヘッドカバー１２の頂壁１２ａの内面には、複数（実施形態では２条）の突壁１３が突出形成されている。突壁１３の先端面１３ａには、板状をなす合成樹脂製の第２の部材としてのバッフルプレート１４が溶着されている。このバッフルプレート１４は、レーザ光の透過性を有する。そして、バッフルプレート１４，突壁１３及びシリンダヘッドカバー１２の頂壁１２ａの間には、ブローバイガスから潤滑オイルを分離するためのオイルセパレート室１５が形成されている。なお、このオイルセパレート室１５内には、図示しないオイル分離のための構成を備えている。 (First embodiment)
Below, 1st Embodiment of this invention is described based on FIGS. 1-3.
As shown in FIG. 1, in the first embodiment, a cylinder head cover 12 as a first member made of synthetic resin is mounted on a cylinder head 11 fixed on a cylinder block (not shown) of an engine. ing. On the inner surface of the top wall 12a of the cylinder head cover 12, a plurality (two in the embodiment) of protruding walls 13 are formed to protrude. A baffle plate 14 as a second member made of a synthetic resin having a plate shape is welded to the distal end surface 13 a of the protruding wall 13. The baffle plate 14 has laser beam transparency. An oil separation chamber 15 for separating lubricating oil from blow-by gas is formed between the baffle plate 14, the protruding wall 13 and the top wall 12 a of the cylinder head cover 12. The oil separation chamber 15 has a structure for oil separation (not shown).

バッフルプレート１４における突壁１３の先端面１３ａと対応する接合位置とその両外側の加圧される位置との間において、前記接合位置から所定距離離隔した部分には、他の部分よりも撓みやすいように凹部よりなる一対の撓曲部２３が形成されている。従って、撓曲部２３は薄肉部により構成されている。前記撓曲部２３の内コーナ２３ａは、円弧状に形成されて、応力集中抑制構造となっている。ちなみに、各部の寸法は、例えば以下のような値が設定される。すなわち、前記突壁１３の厚さＴ１は１〜３ｍｍ、バッフルプレート１４の厚さＴ４は（Ｔ１＋（０．３〜５））ｍｍである。このような場合、凹部よりなる各撓曲部２３の幅Ｔ２が０．５〜１．５ｍｍ、両撓曲部２３の内側面間の間隔Ｔ３が（Ｔ１＋０．３）〜（Ｔ１＋１）ｍｍとなるように設定される。また、撓曲部２３を形成した部分，すなわち薄肉部におけるバッフルプレート１４の厚さＴ５が（Ｔ３×（０．７〜０．９））ｍｍとなるように設定される。   Between the joining position corresponding to the front end surface 13a of the protruding wall 13 on the baffle plate 14 and the pressurized positions on both outer sides thereof, the part spaced apart from the joining position by a predetermined distance is more flexible than the other parts. Thus, a pair of bending parts 23 which consist of a recessed part are formed. Therefore, the bending part 23 is comprised by the thin part. The inner corner 23a of the bent portion 23 is formed in an arc shape and has a stress concentration suppressing structure. Incidentally, for example, the following values are set as the dimensions of each part. That is, the thickness T1 of the protruding wall 13 is 1 to 3 mm, and the thickness T4 of the baffle plate 14 is (T1 + (0.3 to 5)) mm. In such a case, the width T2 of each bent portion 23 made of a concave portion is 0.5 to 1.5 mm, and the interval T3 between the inner side surfaces of both bent portions 23 is (T1 + 0.3) to (T1 + 1) mm. Is set as follows. Further, the thickness T5 of the baffle plate 14 in the portion where the bent portion 23 is formed, that is, the thin portion is set to be (T3 × (0.7 to 0.9)) mm.

図１に示すように、前記バッフルプレート１４の下面には、合成樹脂製の溝部材１６が溶着されている。溝部材１６の幅方向の中央部には、溝部材１６の長手方向に延びる凹溝１６ａが形成されている。凹溝１６ａの内面とバッフルプレート１４の下面との間には、潤滑オイルの流路１７が形成されている。オイルセパレート室１５と流路１７とを連通するように、バッフルプレート１４には連通孔１８が形成されている。流路１７から下方に開口するように、凹溝１６ａの底壁には複数の供給孔１９が形成されている。そして、オイルセパレート室１５内でブローバイガスから分離された潤滑オイルが、連通孔１８を介して流路１７内に流下された後、各供給孔１９からシリンダヘッド１１内の図示しないカムシャフト等に向かって供給される。なお、前記シリンダヘッドカバー１２，バッフルプレート１４及び溝部材１６は同材質により構成されている。   As shown in FIG. 1, a synthetic resin groove member 16 is welded to the lower surface of the baffle plate 14. A concave groove 16 a extending in the longitudinal direction of the groove member 16 is formed at the center in the width direction of the groove member 16. Between the inner surface of the recessed groove 16a and the lower surface of the baffle plate 14, a lubricating oil flow path 17 is formed. A communication hole 18 is formed in the baffle plate 14 so as to communicate the oil separation chamber 15 and the flow path 17. A plurality of supply holes 19 are formed in the bottom wall of the groove 16a so as to open downward from the flow path 17. Then, the lubricating oil separated from the blow-by gas in the oil separation chamber 15 flows down into the flow path 17 through the communication holes 18, and then from each supply hole 19 to a camshaft (not shown) in the cylinder head 11. Supplied towards. The cylinder head cover 12, the baffle plate 14, and the groove member 16 are made of the same material.

次に、レーザ溶着方法について説明する。
さて、レーザ溶着時には、図２（ａ）に示すように、シリンダヘッドカバー１２が上下を逆にした状態で治具２１上に載置される。そして、シリンダヘッドカバー１２内の突壁１３の先端面１３ａ上にバッフルプレート１４の撓曲部２３間の位置が配置される。その後、撓曲部２３と対応する位置よりも両外側の位置において、加圧部材２２によりバッフルプレート１４がシリンダヘッドカバー１２側に加圧される。このため、バッフルプレート１４の下面が突壁１３の先端面１３ａに圧接状態で接合される。 Next, a laser welding method will be described.
Now, at the time of laser welding, as shown in FIG. 2A, the cylinder head cover 12 is placed on the jig 21 in an upside down state. And the position between the bending parts 23 of the baffle plate 14 is arrange | positioned on the front end surface 13a of the protrusion wall 13 in the cylinder head cover 12. FIG. Thereafter, the baffle plate 14 is pressed toward the cylinder head cover 12 by the pressing member 22 at positions outside both sides of the position corresponding to the bent portion 23. For this reason, the lower surface of the baffle plate 14 is joined to the front end surface 13a of the protruding wall 13 in a pressure contact state.

この場合、バッフルプレート１４における突壁１３の先端面１３ａと対応する接合位置とその両外側の加圧される位置との間において、接合位置から離隔した位置には、一対の撓曲部２３が形成されている。そして、撓曲部２３の位置はバッフルプレート１４の他の部分よりも薄くなっており、加圧部材２２による加圧時には、図２（ａ）に示すように、バッフルプレート１４の加圧された部分が、突壁１３の先端面１３ａに対する接合位置の両端付近を起点とすることなく、それよりも外側の撓曲部２３を起点として撓曲変形される。なお、前記撓曲部２３の内コーナ２３ａは、円弧状に形成されているため、この内コーナ２３ａの部分に集中応力が生じることは抑制される。   In this case, a pair of flexures 23 is provided at a position spaced from the joining position between the joining position corresponding to the tip surface 13a of the protruding wall 13 on the baffle plate 14 and the pressurized positions on both outer sides thereof. Is formed. And the position of the bending part 23 is thinner than the other part of the baffle plate 14, and when the pressurization by the pressurizing member 22, the baffle plate 14 was pressurized as shown in FIG. The portion is bent and deformed with the bending portion 23 on the outer side as a starting point without starting near both ends of the joining position with respect to the tip surface 13a of the protruding wall 13. In addition, since the inner corner 23a of the bent portion 23 is formed in an arc shape, the occurrence of concentrated stress in the inner corner 23a is suppressed.

この状態で、バッフルプレート１４を透過して突壁１３の先端面１３ａにレーザ光Ｌが照射される。この場合、レーザ光Ｌは少なくとも突壁１３の先端面１３ａの厚さＴ１の幅で、最大でもバッフルプレート１４の撓曲部２３間の間隔Ｔ３の領域を照射する。このレーザ光Ｌの照射により、突壁１３の先端面１３ａ及びその先端面と１３ａと接しているバッフルプレート１４の面が溶融されて、突壁１３とバッフルプレート１４とが溶着される。その後、加圧部材２２による加圧が解除されると、図２（ｂ）に示すように、バッフルプレート１４が撓曲状態から平板状態に復元される。このとき、バッフルプレート１４が撓曲部２３を起点として復元変形されるため、突壁１３の先端面１３ａとバッフルプレート１４との間の溶着部２４に剥離方向への力が作用することはない。   In this state, the laser beam L is irradiated to the tip surface 13 a of the protruding wall 13 through the baffle plate 14. In this case, the laser beam L irradiates at least the region of the interval T3 between the bent portions 23 of the baffle plate 14 with the width of the thickness T1 of the tip surface 13a of the protruding wall 13 at the maximum. By irradiation of this laser beam L, the tip surface 13a of the protruding wall 13 and the surface of the baffle plate 14 in contact with the tip surface 13a are melted, and the protruding wall 13 and the baffle plate 14 are welded. Thereafter, when the pressurization by the pressurizing member 22 is released, the baffle plate 14 is restored from the bent state to the flat plate state as shown in FIG. At this time, since the baffle plate 14 is restored and deformed starting from the bent portion 23, a force in the peeling direction does not act on the welded portion 24 between the tip surface 13a of the protruding wall 13 and the baffle plate 14. .

従って、この第１実施形態においては、以下の効果がある。
（１） レーザ溶着終了にともなうバッフルプレート１４の復元に際して溶着部２４に剥離方向への力が作用することがないため、溶着部２４の両端縁に亀裂が生じるおそれを防止することができる。このため、高い溶着強度を得ることができるとともに、突壁１３の両側における空間の間に圧力差が必要な場合、その圧力差を維持できる。 Therefore, the first embodiment has the following effects.
(1) Since the force in the peeling direction does not act on the welded portion 24 when the baffle plate 14 is restored upon completion of laser welding, it is possible to prevent the possibility of cracking at both edges of the welded portion 24. For this reason, while being able to obtain high welding strength, when a pressure difference is required between the spaces on both sides of the protruding wall 13, the pressure difference can be maintained.

（２） 突壁１３とバッフルプレート１４との間に亀裂が発生するおそれがないため、バッフルプレート１４を突壁１３の先端面１３ａに対して高い圧力で加圧できる。このため、高い溶着強度を得ることができる。   (2) Since there is no possibility of cracking between the protruding wall 13 and the baffle plate 14, the baffle plate 14 can be pressed against the tip surface 13 a of the protruding wall 13 with a high pressure. For this reason, high welding strength can be obtained.

（３） 撓曲部２３の内コーナ２３ａが円弧状に形成されているため、加圧時にその内コーナ２３ａに対して応力が集中することを防止でき、バッフルプレート１４の割れ等を防止できる。   (3) Since the inner corner 23a of the bent portion 23 is formed in an arc shape, stress can be prevented from concentrating on the inner corner 23a during pressurization, and cracking of the baffle plate 14 can be prevented.

（第２実施形態）
次に、この発明の第２実施形態を、前記第１実施形態と異なる部分を中心に説明する。
さて、この第２実施形態においては、図４に示すように、バッフルプレート１４における突壁１３の先端面１３ａと対応する接合位置とその両外側の加圧位置との間の部分において、先端面１３ａから離隔し、レーザ光の照射部より板厚が薄く形成された他の部分よりも撓みやすい段差部よりなる一対の撓曲部２６が形成されている。この撓曲部２６の内コーナ２６ａは円弧状に形成されている。そして、レーザ溶着に際してバッフルプレート１４が加圧されたとき、バッフルプレート１４が、突壁１３の先端面１３ａの角部を起点とすることなく、それよりも外側の撓曲部２６を起点にして撓曲変形される。 (Second Embodiment)
Next, a second embodiment of the present invention will be described with a focus on differences from the first embodiment.
In the second embodiment, as shown in FIG. 4, the tip surface of the baffle plate 14 is located at the portion between the joint position corresponding to the tip surface 13 a of the projecting wall 13 and the pressurizing position on both outer sides. A pair of bending portions 26 are formed which are spaced apart from 13a and are stepped more easily than other portions formed thinner than the laser light irradiation portion. The inner corner 26a of the bent portion 26 is formed in an arc shape. Then, when the baffle plate 14 is pressurized during laser welding, the baffle plate 14 does not start from the corner of the front end surface 13a of the protruding wall 13 but starts from the bent portion 26 on the outer side. It is bent and deformed.

従って、この第２実施形態においても、前記第１実施形態に記載の効果と同様な効果を得ることができる。
（第３実施形態）
次に、この発明の第３実施形態を、前記第１実施形態と異なる部分を中心に説明する。 Therefore, also in the second embodiment, the same effects as those described in the first embodiment can be obtained.
(Third embodiment)
Next, a third embodiment of the present invention will be described with a focus on differences from the first embodiment.

さて、この第３実施形態では、図５に示すように、撓曲部２６が断面円弧状に形成されている。
従って、この第３実施形態においては、撓曲部２６における応力集中をさらに避けることができる。 Now, in this 3rd Embodiment, as shown in FIG. 5, the bending part 26 is formed in cross-sectional arc shape.
Therefore, in the third embodiment, stress concentration in the bent portion 26 can be further avoided.

（第４実施形態）
次に、この発明の第４実施形態を、前記第１実施形態と異なる部分を中心に説明する。
さて、この第４実施形態では、図６に示すように、ケースにおいて、第１の部材としての合成樹脂製の下部ケース２７の外周縁に、突壁としての周壁２８が形成されている。第２の部材としての上部ケース２９の外周縁には、下部ケース２７の周壁２８に対応するフランジ状の板状部２９ａが形成されている。板状部２９ａにおける周壁２８の先端面２８ａと対応する接合位置とその両外側の加圧位置との間において先端面２８ａから離隔した位置には、他の部分よりも撓みやすい溝状の凹部よりなる一対の撓曲部３０が形成されている。そして、前記第１実施形態と同様な方法により、周壁２８の先端面２８ａに対して板状部２９ａが溶着されて、ケースが密閉状態に保持されている。 (Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with a focus on differences from the first embodiment.
In the fourth embodiment, as shown in FIG. 6, a peripheral wall 28 as a protruding wall is formed on the outer peripheral edge of the synthetic resin lower case 27 as the first member in the case. A flange-shaped plate-like portion 29 a corresponding to the peripheral wall 28 of the lower case 27 is formed on the outer peripheral edge of the upper case 29 as the second member. A groove-shaped recess that is more flexible than other portions is located at a position spaced apart from the tip surface 28a between the joint position corresponding to the tip surface 28a of the peripheral wall 28 in the plate-like portion 29a and the pressurization position on both outer sides thereof. A pair of bent portions 30 are formed. And by the method similar to the said 1st Embodiment, the plate-shaped part 29a is welded with respect to the front end surface 28a of the surrounding wall 28, and the case is hold | maintained in the airtight state.

従って、この第３実施形態においても、前記第１実施形態に記載の効果とほぼ同様の効果を得ることができる。特に、この第３実施形態においては、周壁２８と板状部２９ａとが強固に溶着されることから、ケースの密閉性を高めることに有用である。   Therefore, also in the third embodiment, substantially the same effect as that described in the first embodiment can be obtained. In particular, in the third embodiment, the peripheral wall 28 and the plate-like portion 29a are firmly welded, which is useful for improving the sealing performance of the case.

（変更例）
なお、この実施形態は、次のように変更して具体化することも可能である。
・ 前記実施形態において、撓曲部を凹部または段差部とは異なった薄肉部等の他の形状にすること。例えば、バッフルプレート等の第２の部材に、その溶着部から所定距離離隔した位置から両側に向かって厚さが次第に薄くなる傾斜部を設けて、その傾斜部を撓曲部とすること。 (Example of change)
In addition, this embodiment can also be changed and embodied as follows.
In the above-described embodiment, the bent part is formed in another shape such as a thin part different from the recessed part or the step part. For example, a second member such as a baffle plate is provided with an inclined portion whose thickness gradually decreases toward both sides from a position separated from the welded portion by a predetermined distance, and the inclined portion is used as a bending portion.

・ この発明を、前記実施形態とは異なった部材間のレーザ溶着部の構造に具体化すること。例えば、合成樹脂製のオイルパンの周壁とと蓋板との溶着部の構造において具体化すること。   -The present invention is embodied in a structure of a laser welding portion between members different from that of the above embodiment. For example, it is embodied in the structure of the welded portion between the peripheral wall of the oil pan made of synthetic resin and the lid plate.

第１実施形態のレーザ溶着部の構造を示すシリンダヘッドカバー部分の断面図。Sectional drawing of the cylinder head cover part which shows the structure of the laser welding part of 1st Embodiment. （ａ）は図１のレーザ溶着部の構造における溶着方法を示す部分拡大断面図。（ｂ）は溶着後の状態を示す部分断面図。(A) is the elements on larger scale which show the welding method in the structure of the laser welding part of FIG. (B) is a fragmentary sectional view showing the state after welding. 図１のレーザ溶着部の構造を分解して示す部分斜視図。The fragmentary perspective view which decomposes | disassembles and shows the structure of the laser welding part of FIG. 第２実施形態のレーザ溶着部の構造を示す部分断面図。The fragmentary sectional view which shows the structure of the laser welding part of 2nd Embodiment. 第３実施形態のレーザ溶着部の構造を示す部分断面図。The fragmentary sectional view which shows the structure of the laser welding part of 3rd Embodiment. 第４実施形態のレーザ溶着部の構造を示す部分断面図。The fragmentary sectional view which shows the structure of the laser welding part of 4th Embodiment. （ａ）は従来のレーザ溶着部の構造における溶着方法を示す部分断面図。（ｂ）は溶着後の状態を示す部分断面図、（ｃ）は亀裂の発生状況を示す一部拡大断面図。(A) is a fragmentary sectional view which shows the welding method in the structure of the conventional laser welding part. (B) is the fragmentary sectional view which shows the state after welding, (c) is a partially expanded sectional view which shows the generation | occurrence | production state of a crack.

符号の説明Explanation of symbols

１２…第１の部材としてのシリンダヘッドカバー、１３…突壁、１３ａ…先端面、１４…第２の部材としてのバッフルプレート、１５…オイルセパレート室、２１…治具、２２…加圧部材、２３…凹部よりなる撓曲部、２４…溶着部、２６…段差部よりなる撓曲部、２７…第１の部材としての下部ケース、２８…突壁としての周壁、２８ａ…先端面、２９…第２の部材としての上部ケース、２９ａ…板状部、３０…凹部よりなる撓曲部、Ｌ…レーザ光。   DESCRIPTION OF SYMBOLS 12 ... Cylinder head cover as 1st member, 13 ... Projection wall, 13a ... Front end surface, 14 ... Baffle plate as 2nd member, 15 ... Oil separation chamber, 21 ... Jig, 22 ... Pressure member, 23 DESCRIPTION OF SYMBOLS ... The bending part which consists of a recessed part, 24 ... Welding part, 26 ... The bending part which consists of a level | step-difference part, 27 ... The lower case as a 1st member, 28 ... The peripheral wall as a protruding wall, 28a ... Tip surface, 29 ... 1st 2 is an upper case, 29a is a plate-shaped portion, 30 is a bent portion comprising a concave portion, and L is a laser beam.

Claims (6)

第１の部材に設けられた突壁の先端面に対して、板状をなすとともに、レーザ光透過性を有する第２の部材をレーザ溶着させたレーザ溶着部の構造において、
前記第２の部材における突壁の先端面対する接合位置から外側に離隔した位置には、他の部分よりも撓みやすい撓曲部を設けたことを特徴とするレーザ溶着部の構造。 In the structure of the laser welding portion in which the second member having a plate shape and laser light transmittance is laser welded to the tip surface of the protruding wall provided in the first member,
A structure of a laser welding portion, wherein a bending portion that is more easily bent than other portions is provided at a position spaced outward from a bonding position with respect to a tip surface of the protruding wall in the second member. 前記撓曲部は、薄肉部であることを特徴とする請求項１に記載のレーザ溶着部の構造。 The structure of the laser welding part according to claim 1, wherein the bent part is a thin part. 前記撓曲部は、段差部であることを特徴とする請求項１または２に記載のレーザ溶着部の構造。 The structure of the laser welding part according to claim 1, wherein the bent part is a step part. 前記撓曲部は、応力集中抑制構造を有することを特徴とする請求項１〜３のうちのいずれか一項に記載のレーザ溶着部の構造。 The structure of the laser welding part according to any one of claims 1 to 3, wherein the bent part has a stress concentration suppressing structure. 第１の部材がシリンダヘッドカバー、第２の部材がそのシリンダヘッドカバーの内側に固定されるバッフルプレートであって、それらの両部材の間にブローバイガスから潤滑オイルを分離するためのオイルセパレート室が形成されていることを特徴とする請求項１〜４のうちのいずれか一項に記載のレーザ溶着部の構造。 The first member is a cylinder head cover and the second member is a baffle plate fixed to the inside of the cylinder head cover, and an oil separation chamber for separating lubricating oil from blow-by gas is formed between the two members. The structure of the laser welding part as described in any one of Claims 1-4 characterized by the above-mentioned. 請求項１〜５のうちのいずれか１項に記載のレーザ溶着部の構造において、第１の部材に設けられた突壁の先端面に対して、第２の部材における撓曲部間の位置を接合した状態で、前記撓曲部よりも外側の位置において第２の部材を前記突壁に向かって加圧し、この状態で第２の部材を透過して突壁の先端面にレーザ光を照射することにより、突壁の先端面に第２の部材を溶着させることを特徴とするレーザ溶着方法。 In the structure of the laser welding part of any one of Claims 1-5, the position between the bending parts in a 2nd member with respect to the front end surface of the protrusion wall provided in the 1st member In a state where the second member is joined, the second member is pressurized toward the projecting wall at a position outside the bent portion, and in this state, the second member is transmitted and laser light is transmitted to the tip surface of the projecting wall. A laser welding method, wherein the second member is welded to the tip surface of the protruding wall by irradiation.
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