JP2001162387A - Lap laser welding method - Google Patents

Lap laser welding method

Info

Publication number
JP2001162387A
JP2001162387A JP34722399A JP34722399A JP2001162387A JP 2001162387 A JP2001162387 A JP 2001162387A JP 34722399 A JP34722399 A JP 34722399A JP 34722399 A JP34722399 A JP 34722399A JP 2001162387 A JP2001162387 A JP 2001162387A
Authority
JP
Japan
Prior art keywords
punch
laser welding
steel plate
laser
raised
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP34722399A
Other languages
Japanese (ja)
Other versions
JP3614062B2 (en
Inventor
Toshiyuki Takasago
俊之 高砂
Hiroto Usui
浩人 臼井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP34722399A priority Critical patent/JP3614062B2/en
Publication of JP2001162387A publication Critical patent/JP2001162387A/en
Application granted granted Critical
Publication of JP3614062B2 publication Critical patent/JP3614062B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/24—Seam welding
    • B23K26/244—Overlap seam welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/34—Coated articles, e.g. plated or painted; Surface treated articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/02—Iron or ferrous alloys
    • B23K2103/04—Steel or steel alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/08—Non-ferrous metals or alloys

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Laser Beam Processing (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a lap laser welding method, in which a built-up zone for forming a minute gap for gas relief is easily formed for a steel plate. SOLUTION: In a laser welding method for lapping two rust preventive steel plates 11 and 12, a coining is applied on a face of the steel plate 11 with a punch 17 having a round-shaped zone 16 on its tip, an annular built-up zone 15 is formed in the vicinity of the coined zone on the one side of the steel plate and/or a round built-up zone 15 is formed on the other side, the steel plate 11 and the other steel plate 12 are laminated giving a gap 18 made by the built-up zone 15, and a laser welding is applied on a laminated zone 19.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、防錆鋼板（たとえ
ば、亜鉛メッキ鋼板、メッキ鋼板のメッキ層の上にさら
に樹脂をコーティングした複合鋼板等を含む）の重ねレ
ーザ溶接方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lap laser welding method for rust-proof steel sheets (for example, galvanized steel sheets, composite steel sheets further coated with a resin on a plated layer of a plated steel sheet, etc.).

【０００２】[0002]

【従来の技術】防錆鋼板、たとえば亜鉛メッキ鋼板を重
ねレーザ溶接する場合、図１０に示すように、鋼板１
１、１２間のメッキ部１１ａ、１２ａがレーザ熱で高圧
のガス１４となり（母材であるＦｅの融点は約１５００
℃であるのに対し、たとえば、亜鉛メッキに使用される
Ｚｎの沸点は約９０６℃）、溶接ビード１３を吹き飛ば
して吹き出すことがあり、その場合は溶接不良、溶接強
度低下を招く。この溶接ビードを通しての高圧ガス吹き
出しを抑制するには、鋼板間に微小隙間を設けて、メッ
キ金属がガス化して生じた高圧ガスを微小隙間を通して
逃がすことが有効である。この微小隙間は、約０．４ｍ
ｍ以上あると、溶接部がつながらず、また、約０．１ｍ
ｍより小だとガス逃がしが悪くなって溶接ビードを通し
ての高圧ガス吹き出しが生じやすくなるので、隙間を約
０．１〜０．４ｍｍの範囲に管理することが必要である
（トヨタ技術公開集Ｎｏ．９０１８）。重ねレーザ溶接
される２枚の鋼板間に微小隙間を形成するには、従来、
つぎのような、防錆鋼板の一方に隙間形成用の凸部を形
成する方法、または２枚の板の形状を利用する方法など
がある。 エンボス加工 一方の型に凸部を形成し他方の型に該凸部と位置を合わ
せて凹部を形成しておき、型間に鋼板を挟んでプレス
し、鋼板に凸部を成形する。 レーザスポット 特開平１１−４７９６７号公報に開示されているよう
に、鋼板にレーザ光を照射して溶融池を作りそこにガス
を吹き付けて溶融金属を溶融池の周りに押し出し環状の
凸部を形成する。溶融池の部分は凹部となる。 板の打ち抜きばりあるいは断面Ｒ部の利用 鋼板の打ち抜きばりを凸部として利用する。あるいは湾
曲断面の鋼板と直線断面の鋼板を重ねた場合に生じる板
間隙間をガス逃げ用隙間として利用する。2. Description of the Related Art When lap-resistant steel sheets, for example, galvanized steel sheets are overlapped and laser-welded, as shown in FIG.
The plating portions 11a and 12a between the first and the second 12 become high-pressure gas 14 by the laser heat (the melting point of Fe as a base material is about 1500
° C, for example, the boiling point of Zn used for galvanizing is about 906 ° C), and the welding bead 13 may be blown off and blown out, which leads to poor welding and reduced welding strength. In order to suppress the blowing of high-pressure gas through the welding bead, it is effective to provide a minute gap between the steel plates and allow the high-pressure gas generated by gasification of the plated metal to escape through the minute gap. This small gap is about 0.4m
m or more, the weld is not connected, and
If it is smaller than m, gas escape becomes worse and high-pressure gas blowing through the weld bead tends to occur. Therefore, it is necessary to manage the gap in a range of about 0.1 to 0.4 mm (Toyota Technical Publication No. .9018). Conventionally, to form a small gap between two steel plates to be lap laser welded,
There are the following methods of forming a convex portion for forming a gap on one of the rust-preventive steel plates, and a method of utilizing the shape of two plates. Embossing A convex portion is formed on one mold and a concave portion is formed on the other mold in alignment with the convex portion, and a steel plate is pressed between the dies to form a convex portion on the steel plate. Laser spot As disclosed in Japanese Patent Application Laid-Open No. H11-47967, a steel plate is irradiated with laser light to form a molten pool, and gas is blown there to extrude the molten metal around the molten pool to form an annular convex portion. I do. The portion of the molten pool becomes a concave portion. Use of stamped plate or cross section R section A stamped plate of steel plate is used as a projection. Alternatively, a gap between the plates generated when a steel plate having a curved cross section and a steel plate having a straight cross section are overlapped is used as a gas escape clearance.

【０００３】[0003]

【発明が解決しようとする課題】しかし、上記の隙間形
成方法にはつぎの問題があった。上記のエンボス加工
による凸部形成においては、上下型の凹凸を位置合わせ
するのが難しい。また、０．１〜０．４ｍｍ程度の高さ
の微小凸部を作りだすことが難しく、凸部の寸法管理が
困難である。上記のレーザスポットによる凸部形成に
おいては、レーザ照射により凹凸部を形成するため加工
費が高い。また、１点ずつレーザ照射していくため時間
もかかる。また、凸部形成のための工程が鋼板のプレス
工程以外に必要となる。これらの結果、コストアップを
招く。上記の板の打ち抜きばりを利用した隙間形成方
法においては、ばりの高さの管理が難しく隙間の寸法管
理が困難である。また、断面Ｒの形状を利用して隙を作
る場合は、レーザ光の照射位置が少しでもずれると、板
間隙間の寸法が大きくく変化し、隙間の寸法管理が難し
い。本発明の目的は、重ねレーザ溶接される防錆鋼板間
にガス逃がし用の微小隙間を形成するための凸部を、重
ねレーザ溶接される一方の鋼板に、容易に形成すること
ができる重ねレーザ溶接方法を提供することにある。However, the above-described gap forming method has the following problems. In the formation of the convex portion by the embossing, it is difficult to align the concave and convex portions of the upper and lower molds. In addition, it is difficult to create a minute projection having a height of about 0.1 to 0.4 mm, and it is difficult to control the dimension of the projection. In the above-described formation of the convex portion using the laser spot, the processing cost is high because the uneven portion is formed by laser irradiation. In addition, it takes time to irradiate the laser point by point. In addition, a process for forming the projections is required in addition to the steel plate pressing process. As a result, the cost is increased. In the above-described method of forming a gap using a punched plate, it is difficult to control the height of the burrs and it is difficult to control the dimensions of the gap. In the case where a gap is formed by using the shape of the cross section R, even if the irradiation position of the laser beam is shifted even a little, the dimension between the plate gaps changes greatly, and it is difficult to control the dimension of the gap. SUMMARY OF THE INVENTION An object of the present invention is to provide a lap laser capable of easily forming a convex portion for forming a minute gap for gas release between rust-proof steel plates to be lap laser welded on one steel plate to be lap laser welded. It is to provide a welding method.

【０００４】[0004]

【課題を解決するための手段】上記目的を達成する本発
明はつぎの通りである。 （１） ２枚の防錆鋼板の重ねレーザ溶接方法であっ
て、先端に凸形状部を有するポンチの前記凸形状部によ
り一方の鋼板の一面に圧印加工を施して、該一面の圧印
部周囲に環状の盛り上り部および／または他面に山状の
盛り上り部を形成し、一方の鋼板と他方の鋼板を前記盛
り上り部による隙間をもたせて重ね合せ、重ね合せ部に
レーザ溶接を施す、重ねレーザ溶接方法。 （２） 前記圧印加工が施される鋼板をプレス成形する
プレス装置の、前記鋼板のレーザ溶接が施される部分を
挟む２つの型のうち一方の型に、前記ポンチを、ポンチ
先端を型表面から突出させ型に該突出ポンチ先端の周囲
に型表面から後退した凹部を形成して、組み込んでお
き、前記２つの型のうち他方の型の、前記ポンチに対向
する面を平坦面としておき、前記圧印加工が施される鋼
板のプレス成形時に該プレス成形と同時に、前記圧印加
工が施される鋼板の前記２つの型で挟まれる部分に前記
盛り上り部を形成する（１）記載の重ねレーザ溶接方
法。 （３） レーザ溶接すべき部位の長手方向と直交方向
に、前記盛り上り部の中心と前記レーザ溶接すべき部位
の中心との間隔が約３ｍｍ以内となり、かつ前記レーザ
溶接すべき部位の長手方向と平行方向に、盛り上り部の
中心間隔が約１０ｍｍ以内、前記レーザ溶接すべき部位
の端部と前記盛り上り部の中心との間隔が約５ｍｍ以内
となるように、前記圧印加工が施される鋼板に対する前
記ポンチの位置を決定する請求項１記載の重ねレーザ溶
接方法。The present invention to achieve the above object is as follows. (1) A method for lap laser welding of two rust-proof steel plates, wherein a stamping process is performed on one surface of one of the steel plates by using the projecting portion of the punch having a projecting portion at the tip, and the periphery of the stamping portion on the one surface. An annular raised portion and / or a mountain-shaped raised portion is formed on the other surface, and one steel plate and the other steel plate are overlapped with a gap formed by the raised portion, and laser welding is performed on the overlapped portion. , Lap laser welding method. (2) In a press apparatus for press-forming a steel sheet to be subjected to the coining process, the punch is placed on one of two dies that sandwich a portion of the steel sheet to be subjected to laser welding, and the punch tip is placed on the mold surface. A recess recessed from the mold surface is formed around the tip of the projecting punch on the mold, and the mold is set in the other mold of the two molds, and the surface of the other mold facing the punch is flat. The overlap laser according to (1), wherein, at the time of press forming of the steel sheet subjected to the coining process, the bulge portion is formed at the same time as the press forming at a portion between the two molds of the steel sheet subjected to the coining process. Welding method. (3) In the direction orthogonal to the longitudinal direction of the portion to be laser-welded, the distance between the center of the raised portion and the center of the portion to be laser-welded is within about 3 mm, and the longitudinal direction of the portion to be laser-welded. In the direction parallel to the above, the coining process is performed so that the center interval of the swell portion is about 10 mm or less, and the interval between the end of the portion to be laser-welded and the center of the swell portion is about 5 mm or less. 2. The lap laser welding method according to claim 1, wherein the position of the punch with respect to the steel plate is determined.

【０００５】上記（１）の重ねレーザ溶接方法では、ポ
ンチによる圧印加工によって盛り上り部を形成するの
で、従来法に比べて容易かつ安価に盛り上りを形成する
ことができる。上記（２）の重ねレーザ溶接方法では、
２つの型のうちポンチを組み込まない方の型の、ポンチ
に対向する面を平坦面としておくので、ポンチ対向面に
凹部を形成しておく場合（エンボス加工により盛り上り
部を形成する場合）に比べて、ポンチの凸形状部と凹部
との位置合わせが不要となり、盛り上り部形成が容易で
安価になる。上記（３）の重ねレーザ溶接方法では、圧
印加工が施される鋼板に対するポンチの位置が上記
（３）の条件を満足することにより、すべての盛り上り
部がレーザ溶接中に発生した高圧ガスを逃がすのに有効
に働き、高品質なレーザ溶接を実行することができる。In the lap laser welding method (1), the bulge is formed by coining with a punch, so that the bulge can be formed more easily and at lower cost than the conventional method. In the lap laser welding method of the above (2),
Since the surface facing the punch of the one of the two types that does not incorporate the punch is flat, the concave portion is formed in the punch-facing surface (when the embossed portion is formed by embossing). Compared with this, it is not necessary to align the convex portion and the concave portion of the punch, so that the raised portion can be formed easily and inexpensively. In the lap laser welding method of the above (3), when the position of the punch with respect to the steel sheet subjected to the coining process satisfies the condition of the above (3), all the swells remove the high pressure gas generated during the laser welding. It works effectively to escape and can perform high quality laser welding.

【０００６】[0006]

【発明の実施の形態】以下に、本発明実施例の重ねレー
ザ溶接方法を、図１〜図９を参照して説明する。図１、
図２に示すように、本発明実施例の重ねレーザ溶接は、
２枚の防錆鋼板１１、１２の重ねレーザ溶接方法であ
る。防錆鋼板１１、１２は、亜鉛等のメッキ鋼板（図１
ではメッキ部を図示略、図２では１１ａ、１２ａが鋼板
１１、１２のメッキ部を示す）、またはメッキ鋼板の上
に樹脂などを塗装した複合メッキ鋼板からなる。鋼板１
１、１２は、たとえば、自動車用薄鋼板等として利用さ
れる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A lap laser welding method according to an embodiment of the present invention will be described below with reference to FIGS. Figure 1,
As shown in FIG. 2, the lap laser welding of the embodiment of the present invention
This is a lap laser welding method for two rustproof steel plates 11 and 12. The rust-preventive steel plates 11 and 12 are made of a galvanized steel plate such as zinc (FIG. 1).
In FIG. 2, a plating portion is not shown, and in FIG. 2, reference numerals 11a and 12a denote plating portions of the steel plates 11 and 12), or a composite plated steel plate in which a resin or the like is coated on the plated steel plate. Steel plate 1
1 and 12 are used, for example, as a thin steel plate for an automobile.

【０００７】本発明実施例の重ねレーザ溶接は、２枚の
防錆鋼板１１、１２のうちの何れか一方の鋼板１１に盛
り上り部１５を形成する工程と、２枚の防錆鋼板１１、
１２を重ね合わせてレーザ溶接をする工程と、からな
る。盛り上り部１５を形成する工程では、図１に示すよ
うに、先端に凸形状部１６を有するポンチ１７の凸形状
部１６により一方の鋼板１１の一面に圧印加工を施し
て、該一面の圧印部周囲に環状の盛り上り部１５および
／または他面に山状の盛り上り部１５を形成する。凸形
状部１６の先端は、鋭角にすると摩耗が激しいので、平
坦または凸状湾曲とされている。また、レーザ溶接工程
では、図２に示すように、一方の鋼板１１と他方の鋼板
１２を、盛り上り部１５による隙間１８をもたせて重ね
合せ、重ね合せ部１９にレーザ光２０を照射してレーザ
溶接を施す。In the lap laser welding according to the embodiment of the present invention, a step of forming a raised portion 15 on one of the two rust-proof steel plates 11 and 12 is performed.
And performing laser welding by superimposing 12 on each other. In the step of forming the raised portion 15, as shown in FIG. 1, a stamping process is performed on one surface of one of the steel plates 11 by a projecting portion 16 of a punch 17 having a projecting portion 16 at the tip, and stamping of the one surface is performed. An annular raised portion 15 is formed around the portion and / or a mountain-shaped raised portion 15 is formed on the other surface. The tip of the protruding portion 16 is flat or convexly curved because sharp edges cause severe wear. In the laser welding step, as shown in FIG. 2, one steel sheet 11 and the other steel sheet 12 are overlapped with a gap 18 formed by a raised portion 15, and a laser beam 20 is applied to the overlapped portion 19. Apply laser welding.

【０００８】盛り上り部１５を形成する工程では、図１
に示すように、圧印加工が施される鋼板１１をプレス成
形するプレス装置２１の、鋼板１１のレーザ溶接が施さ
れる部分を挟む２つの型２２、２３のうち一方の型２２
に、ポンチ１７を、ポンチ先端の凸形状部１６の先端部
を所定量型表面２２ａから突出させ型２２に該突出ポン
チ先端の周囲に型表面２２ａから後退した凹部２４を形
成して、組み込んでおき、２つの型２２、２３のうち他
方の型２３の、ポンチ１７に対向する面２３ａは平坦面
としておき、圧印加工が施される鋼板１１のプレス成形
時に該プレス成形と同時に、圧印加工が施される鋼板１
１の２つの型２２、２３で挟まれる部分に盛り上り部１
５を形成する。プレス成形と同時に盛り上り部１５を形
成することにより、盛り上り部１５形成のために特別に
余分の工程を設ける必要がなく、工程増、コストアップ
を招かない。In the step of forming the raised portion 15, FIG.
As shown in FIG. 1, one of the two dies 22, 23 of a pressing device 21 for press-forming a steel plate 11 to be coined, which sandwiches a portion of the steel plate 11 where laser welding is performed.
Then, a punch 17 is formed by projecting the tip of the convex portion 16 at the tip of the punch from the mold surface 22a by a predetermined amount, and forming a concave portion 24 recessed from the mold surface 22a around the tip of the projecting punch in the mold 22 and incorporating the punch. The surface 23a of the other die 23 of the two dies 22, 23 facing the punch 17 is set to be a flat surface, and at the time of press forming of the steel sheet 11 to be subjected to the coining, coining is performed simultaneously with the press forming. Steel plate 1 to be applied
The raised portion 1 is located between the two molds 22 and 23 of FIG.
5 is formed. By forming the raised portion 15 at the same time as the press molding, it is not necessary to provide an extra step for forming the raised portion 15, and the number of steps and cost are not increased.

【０００９】ポンチ１７の型２２への組み込みは、望ま
しくは、ポンチ１７を型２２と別体に形成しておいて、
型２２に形成したポンチ受入れ凹部２５に挿入すること
によって行う。ただし、型２２に一体にポンチ１７の凸
形状部１６およびそのまわりの凹部２４を形成してもよ
い。ポンチ１７を型２２と別体に形成しておいて、型２
２に形成したポンチ受入れ凹部２５に挿入する場合は、
ポンチ１７は円筒部１７ａと凸形状部１６を有し、円筒
部１７ａは凸形状部１６の外径より大の外径を有し、円
筒部１７ａの高さはポンチ受入れ凹部２５の深さより小
の高さを有し、これによって円筒部１７ａの上方で凸形
状部１６のまわりに凹部２４が形成されるようにする。Preferably, the punch 17 is incorporated into the mold 22 by forming the punch 17 separately from the mold 22.
This is performed by inserting into a punch receiving recess 25 formed in the mold 22. However, the convex portion 16 of the punch 17 and the concave portion 24 around it may be formed integrally with the mold 22. The punch 17 is formed separately from the mold 22 and
When inserting into the punch receiving recess 25 formed in 2,
The punch 17 has a cylindrical portion 17a and a convex portion 16, the cylindrical portion 17a has an outer diameter larger than the outer diameter of the convex portion 16, and the height of the cylindrical portion 17a is smaller than the depth of the punch receiving concave portion 25. So that a concave portion 24 is formed around the convex portion 16 above the cylindrical portion 17a.

【００１０】他方の型２３のポンチ１７対向部も、ポン
チ受け部を型２３と別体に形成しておき、型２３に形成
したポンチ受け部受入れ凹部に挿入するようにしてもよ
い。こうすることによって、他方の型２３のポンチ１７
対向部の平坦面が、プレスによる盛り上り部１５形成を
重ねるうちに摩耗してきて凹状になった時に、容易にポ
ンチ受け部だけを取り替えて平坦面を維持することがで
きる。The punch receiving portion of the other die 23 may also be formed separately from the die receiving portion and inserted into the punch receiving portion receiving recess formed in the die 23. By doing so, the punch 17 of the other mold 23 is formed.
When the flat surface of the facing portion becomes worn and becomes concave while the raised portion 15 is formed by pressing, the flat surface can be easily maintained by simply replacing the punch receiving portion.

【００１１】プレス装置２１は、下型２２、上型である
曲刃２３、パッド２６からなり、ポンチ１７は下型２２
に組み込まれ、曲刃２３のポンチ対向面を平坦面とした
場合が示されている。ただし、ポンチ１７が曲刃２３に
組み込まれ、下型２２のポンチ対向面を平坦面としても
よい。The pressing device 21 includes a lower die 22, a curved blade 23 as an upper die, and a pad 26.
And the case where the punch facing surface of the curved blade 23 is a flat surface is shown. However, the punch 17 may be incorporated in the curved blade 23 and the punch facing surface of the lower mold 22 may be a flat surface.

【００１２】レーザ溶接工程では、図２に示すように、
２枚の鋼板１１、１２を重ね合わせて強く押さえる。Ｆ
は押え力である。この場合、一方の鋼板１１に盛り上り
部１５が予め形成されているので、２枚の鋼板１１、１
２間には盛り上り部１５の高さだけの隙間１８が形成さ
れる。隙間１８は、レーザ溶接時に２枚の鋼板１１、１
２間に発生する高圧ガスを逃がす通路となる。この状態
で、２枚の鋼板１１、１２の重ね合せ部１９にレーザ光
２０を照射してレーザ溶接を施す。レーザ溶接は、盛り
上り部１５によって２枚の鋼板１１、１２間に隙間１８
が形成されている領域（盛り上り部１５からの距離が大
になり過ぎると型２１、２２によって押されている鋼板
１１、１２が互いに接触し隙間が無くなるので、盛り上
り部１５からの距離が所定距離以内で鋼板１１、１２間
に隙間が存在する領域）に施される。この領域でレーザ
溶接が施されると、鋼板１１、１２のメッキ１１ａ、１
１ｂがレーザ溶接の熱でガス化して高圧ガスが発生して
も、隙間１８を通って外部に逃げるので、溶接ビードを
吹き飛ばして表面側に吹き出すことがなく、正常なレー
ザ溶接ビード１３が形成され、溶接強度が確保される。In the laser welding process, as shown in FIG.
The two steel plates 11 and 12 are overlapped and strongly pressed. F
Is the holding force. In this case, since the raised portion 15 is formed in advance on one of the steel plates 11, the two steel plates 11, 1
A gap 18 having a height equal to the height of the raised portion 15 is formed between the two. The gap 18 is formed between the two steel plates 11, 1 during laser welding.
It becomes a passage for releasing the high-pressure gas generated between the two. In this state, a laser beam 20 is applied to the superposed portion 19 of the two steel plates 11 and 12 to perform laser welding. In the laser welding, a gap 18 is formed between the two steel plates 11 and 12 by the raised portion 15.
(If the distance from the raised portion 15 becomes too large, the steel plates 11 and 12 pressed by the molds 21 and 22 come into contact with each other and the gap disappears. (A region where a gap exists between the steel plates 11 and 12 within a predetermined distance). When laser welding is performed in this region, plating 11a, 1
Even if 1b is gasified by the heat of the laser welding and a high-pressure gas is generated, it escapes to the outside through the gap 18, so that the welding bead is not blown and blown out to the surface side, and a normal laser welding bead 13 is formed. , Welding strength is ensured.

【００１３】レーザ溶接２０が、盛り上り部１５によっ
て２枚の鋼板１１、１２間に隙間１８が形成されている
領域に施されるために、圧印加工が施される鋼板１１に
対するポンチ１７の位置は、図９に示すように、決定さ
れる。すなわち、レーザ溶接すべき部位２７（溶接後、
溶接ビード１３となる部位）の長手方向と直交方向に、
盛り上り部１５の中心とレーザ溶接すべき部位２７の中
心との間隔が約３ｍｍ以内となり、かつレーザ溶接すべ
き部位２７の長手方向と平行方向に、盛り上り部１５の
中心間隔が約１０ｍｍ以内で、レーザ溶接すべき部位２
７の端部と盛り上り部１５の中心との間隔が約５ｍｍ以
内となるように、ポンチ１７の位置が決定される。The position of the punch 17 with respect to the steel sheet 11 to be coined because the laser welding 20 is performed by the raised portion 15 in the area where the gap 18 is formed between the two steel sheets 11 and 12. Is determined as shown in FIG. That is, the part 27 to be laser-welded (after welding,
In the direction perpendicular to the longitudinal direction of the weld bead 13),
The distance between the center of the raised portion 15 and the center of the portion 27 to be laser-welded is within about 3 mm, and the distance between the centers of the raised portions 15 in the direction parallel to the longitudinal direction of the portion 27 to be laser-welded is within about 10 mm. The part to be laser welded 2
The position of the punch 17 is determined so that the distance between the end of the ridge 7 and the center of the raised portion 15 is within about 5 mm.

【００１４】[0014]

【実施例】盛り上り部１５の成形荷重を把握する試験を
行った。図３に試験装置を示す。盛り上り部１５を形成
すべき亜鉛メッキ鋼板１１からなるワークを、下型２２
の上に配置したスペーサ２８およびポンチ１７と、上型
２３との間に挟み、ワーク１１に盛り上り部１５を形成
した。ポンチ１７は凸形状部１６、円筒部１７ａ、基礎
部１７ｂを有し、ポンチ１７の円筒部１７ａまわりにス
ペーサ２８を配置し、凸形状部１６の上端部がスペーサ
２８の上端より０．８ｍｍ突出するセットした。ポンチ
１７は台２９で支持し、台２９をウレタンの筒体３０で
支持して図示略の下型２２上に配置した。EXAMPLE A test was conducted to determine the forming load of the raised portion 15. FIG. 3 shows a test apparatus. The work made of the galvanized steel sheet 11 on which the raised portion 15 is to be formed is moved to the lower mold 22.
A raised portion 15 was formed in the work 11 by being sandwiched between the upper mold 23 and the spacer 28 and the punch 17 disposed on the upper mold 23. The punch 17 has a convex portion 16, a cylindrical portion 17a, and a base portion 17b. A spacer 28 is disposed around the cylindrical portion 17a of the punch 17, and the upper end of the convex portion 16 projects 0.8 mm from the upper end of the spacer 28. I set it. The punch 17 was supported by a table 29, and the table 29 was supported by a urethane cylinder 30, and was placed on a lower mold 22 (not shown).

【００１５】試験仕様はつぎの通りであった。 ポンチの凸形状部のテーパ角度：９０°および６０°の
２種類のポンチを使用した。 ポンチの円筒部と凸形状部との高さ：１０ｍｍ スペーサ高さ：９．２ｍｍ。ポンチの円筒部と凸形状部
との高さ−スペーサ高さ＝０．８ｍｍがスペーサからの
ポンチ先端部突出量となる。 荷重＝６００ｋｇ 鋼板板厚＝１．０ｍｍ ポンチの個数ｎ＝１The test specifications were as follows. Two types of punches having a taper angle of 90 ° and 60 ° of the convex portion of the punch were used. Height between the cylindrical portion and the convex portion of the punch: 10 mm Spacer height: 9.2 mm. The height between the cylindrical portion and the convex portion of the punch-the spacer height = 0.8 mm is the amount of protrusion of the punch tip from the spacer. Load = 600kg Steel plate thickness = 1.0mm Number of punches n = 1

【００１６】試験結果を図４に示す。図４において、縦
軸は試験後の板厚（元板厚１ｍｍ＋ポンチ接触側の盛り
上り部の高さａ＋それと反対側の盛り上り部の高さｂ）
で横軸はかけた荷重６００ｋｇまでを１００ｋｇ間隔で
示す。図４には、ポンチ角が６０°の場合と９０°の場
合の試験結果をプロットしてそれを折れ線の実線で結ん
だものを示してあり、破線は各折れ線の平均を線型の直
線で示したものである。図５、図６はポンチ角が９０°
で、荷重Ｆが６００ｋｇの場合のワークの表裏面の形状
測定を０．２ｍｍピッチで行った結果を示している。図
６はポンチ接触側と反対側の面を示したもので０．１ｍ
ｍ以上の山状の盛り上り部が形成されていることがわか
る。また、図５はポンチ接触側の面を示したもので、ポ
ンチで押された部分が約０．８ｍｍ凹みその周囲が盛り
上がったクレータ状の凹凸となっていることがわかる。
そしてクレータ状の凹凸の盛り上り部の高さはポンチ接
触側と反対側の面の盛り上り部の高さよりは低かった。FIG. 4 shows the test results. In FIG. 4, the vertical axis represents the thickness of the plate after the test (original plate thickness 1 mm + height a of the ridge on the punch contact side + height b of the ridge on the opposite side).
The horizontal axis indicates the applied load up to 600 kg at intervals of 100 kg. FIG. 4 shows test results obtained when the punch angle is 60 ° and 90 ° and plots the results and connects them with a solid line, and the broken line shows the average of each broken line with a linear straight line. It is a thing. 5 and 6 show a punch angle of 90 °.
The figure shows the result of measuring the shape of the front and back surfaces of the work at a pitch of 0.2 mm when the load F is 600 kg. FIG. 6 shows the surface opposite to the punch contact side, and is 0.1 m.
It can be seen that a mountain-like swelling portion of m or more is formed. FIG. 5 shows the surface on the punch contact side, and it can be seen that the portion pressed by the punch is recessed by about 0.8 mm and has a crater-like unevenness with its periphery raised.
The height of the raised portion of the crater-shaped unevenness was lower than the height of the raised portion on the surface opposite to the punch contact side.

【００１７】図４、図５、図６より、板厚増加量（ワー
ク表裏面の盛り上り部の高さの和）は０．０６〜０．１
５ｍｍであり、０．１ｍｍ程度のワークの表裏面の盛り
上り部の高さの和を形成することは圧印加工で可能であ
り、その場合盛り上り部１個につき約３００ｋｇ程度以
上の荷重が必要であることがわかった。鋼板成形のため
のプレス装置の荷重容量はそれより数十倍以上あるか
ら、従来のプレス装置にポンチを組み込んでプレス成形
と同時に圧印加工を施すことが可能であることもわかっ
た。4, 5, and 6, the increase in the plate thickness (the sum of the heights of the raised portions on the front and back surfaces of the work) is 0.06 to 0.1.
It is 5 mm, and it is possible to form the sum of the heights of the raised parts on the front and back of the work of about 0.1 mm by stamping, in which case a load of about 300 kg or more is required for each raised part It turned out to be. Since the load capacity of the press device for forming a steel sheet is several tens of times or more than that, it was also found that it is possible to incorporate a punch into a conventional press device and perform coining simultaneously with press forming.

【００１８】また、ワークの表裏面の盛り上り部の高さ
の和が０．１ｍｍ程度ある場合、ワーク表裏で盛り上り
部の高さに差があるので、片側面で約０．０７ｍｍ以上
の盛り上り部の高さが得られる。そして、片側面に０．
０７ｍｍの盛り上り部を形成した１ｍｍ厚亜鉛メッキ鋼
板を平坦な亜鉛メッキ鋼板と重ねあわせてレーザ溶接を
施したところ、溶接ビードの吹き飛ばしの無い良好な溶
接ビードが得られた。このことから、メッキ高圧ガス逃
がし用に２枚の防錆鋼板間の隙間として従来必要と考え
られていた「０．１ｍｍ以上」の条件は「０．０７ｍｍ
以上」であればよいことがわかった。When the sum of the heights of the raised portions on the front and back surfaces of the work is about 0.1 mm, there is a difference in the height of the raised portions on the front and back surfaces of the work. The height of the swell is obtained. Then, on one side, 0.
When a 1 mm-thick galvanized steel sheet having a bulged portion of 07 mm was overlapped with a flat galvanized steel sheet and subjected to laser welding, a good weld bead without blowing off the weld bead was obtained. From this, the condition of “0.1 mm or more” conventionally considered to be necessary as a gap between two rust-proof steel sheets for plating high-pressure gas release is set to “0.07 mm
Or more. "

【００１９】つぎに、良好な（高圧ガスによるビード吹
き飛ばしのない）溶接ビード１３が得られるための、盛
り上り部１５とレーザ溶接すべき部位２７との位置関係
についての試験を行った。盛り上り部１５を形成した亜
鉛メッキ鋼板１１の試験片を無作為に１０個選び、盛り
上り部高さ（ワーク表裏面の盛り上り部高さの和）を測
定したところ０．１０ｍｍ〜０．１３ｍｍの範囲にあ
り、単純平均で０．１２ｍｍであった。Next, a test was conducted on the positional relationship between the raised portion 15 and the portion 27 to be laser-welded to obtain a good weld bead 13 (without bead blow-off by high-pressure gas). Ten test pieces of the galvanized steel sheet 11 on which the protruding portions 15 were formed were randomly selected, and the height of the protruding portions (sum of the heights of the protruding portions on the front and back surfaces of the work) was measured. It was in the range of 13 mm, with a simple average of 0.12 mm.

【００２０】図７に、溶接ビード１３の中心から１ｍ
ｍ、２ｍｍ、３ｍｍ、４ｍｍの距離でビード中央に位置
するように盛り上り部１５を形成した場合の重ね合わせ
レーザ溶接の結果を示し、図８に溶接ビード１３から２
ｍｍの距離で、中央から７．５ｍｍおよび１２．５ｍｍ
の位置に盛り上り部１５を形成した場合の重ね合わせレ
ーザ溶接の結果を示す。斜線の部分は目視で溶接ビード
に荒れが見られた部分である。図７および図８より、溶
接ビード１３の荒れ防止に有効な盛り上り部１５形成領
域は、溶接ビード１３（溶接すべき部位２７）の中心か
ら、約３ｍｍ以内であり、溶接ビード長手方向に盛り上
り部１５の効果は盛り上り部１５から約５ｍｍまでであ
ることがわかった。図９に有効領域の範囲を示した。た
だし、上記３ｍｍ、５ｍｍは、平板の限定された板厚に
ついてのデータであり、あくまで目安の数字であり、実
験は効果があることを実証したに過ぎない。FIG. 7 shows one meter from the center of the weld bead 13.
m, 2 mm, 3 mm, and 4 mm show the results of superposition laser welding when the raised portion 15 is formed so as to be located at the center of the bead at a distance of 2 mm, and FIG.
7.5 mm and 12.5 mm from the center at a distance of mm
Shows the result of the overlap laser welding when the raised portion 15 is formed at the position of. The hatched portion is the portion where the weld bead was visually rough. 7 and 8, the area where the raised portion 15 is effective to prevent the roughness of the weld bead 13 is within about 3 mm from the center of the weld bead 13 (the part 27 to be welded), and is formed in the longitudinal direction of the weld bead. It was found that the effect of the rising portion 15 was about 5 mm from the rising portion 15. FIG. 9 shows the range of the effective area. However, the above 3 mm and 5 mm are data on the limited thickness of the flat plate, and are merely reference values, and the experiment merely proves that it is effective.

【００２１】[0021]

【発明の効果】請求項１の重ねレーザ溶接方法によれ
ば、ポンチによる圧印加工によって盛り上り部を形成す
るので、従来法に比べて容易かつ安価に盛り上りを形成
することができる。請求項２の重ねレーザ溶接方法によ
れば、２つの型のうちポンチを組み込まない方の型の、
ポンチに対向する面を平坦面としておくので、ポンチ対
向面に凹部を形成しておく場合（エンボス加工により盛
り上り部を形成する場合）に比べて、ポンチの凸形状部
と凹部との位置合わせが不要となり、盛り上り部形成が
容易で安価になる。請求項３の重ねレーザ溶接方法によ
れば、レーザ溶接すべき部位の長手方向と直交方向に、
盛り上り部の中心とレーザ溶接すべき部位の中心との間
隔が約３ｍｍ以内となり、かつレーザ溶接すべき部位の
長手方向と平行方向に、盛り上り部の中心間隔が約１０
ｍｍ以内、レーザ溶接すべき部位の端部と盛り上り部の
中心との間隔が約５ｍｍ以内となるように、圧印加工が
施される鋼板に対するポンチの位置を決定するので、す
べての盛り上り部がレーザ溶接中に発生した高圧ガスを
逃がすのに有効に働き、高品質なレーザ溶接を実行する
ことができる。According to the lap laser welding method of the first aspect, the raised portion is formed by coining with a punch, so that the raised portion can be formed more easily and at lower cost than the conventional method. According to the lap laser welding method of claim 2, of the two types, the one that does not incorporate the punch,
Since the surface facing the punch is a flat surface, the position of the convex portion and the concave portion of the punch is aligned as compared with the case where a concave portion is formed on the surface facing the punch (when a raised portion is formed by embossing). Is unnecessary, and the formation of the raised portion is easy and inexpensive. According to the lap laser welding method of claim 3, in the direction perpendicular to the longitudinal direction of the portion to be laser-welded,
The distance between the center of the raised portion and the center of the portion to be laser-welded is within about 3 mm, and the distance between the centers of the raised portions is approximately 10 in the direction parallel to the longitudinal direction of the portion to be laser-welded.
The position of the punch with respect to the steel sheet to be coined is determined so that the distance between the end of the portion to be laser-welded and the center of the raised portion is within approximately 5 mm. Works effectively to release high-pressure gas generated during laser welding, and high-quality laser welding can be performed.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明実施例の重ねレーザ溶接方法の、盛り上
り部形成工程の、断面図である。FIG. 1 is a cross-sectional view of a bulging portion forming step of a lap laser welding method according to an embodiment of the present invention.

【図２】本発明実施例の重ねレーザ溶接方法のレーザ溶
接工程の、断面図である。FIG. 2 is a sectional view of a laser welding process of the lap laser welding method according to the embodiment of the present invention.

【図３】圧印加工試験に用いた装置の断面図である。FIG. 3 is a sectional view of an apparatus used for a coining test.

【図４】圧印加工の、板厚対荷重の関係を示すグラフで
ある。FIG. 4 is a graph showing the relationship between plate thickness and load in coining.

【図５】圧印加工後ワーク表面を粗さ計で測定した時
の、ワークのポンチ接触側の表面の凹凸図である。FIG. 5 is an uneven view of the surface of the work on the punch contact side when the work surface is measured by a roughness meter after coining.

【図６】圧印加工後ワーク表面を粗さ計で測定した時
の、ワークのポンチ接触側と反対側の表面の凹凸図であ
る。FIG. 6 is an uneven view of the surface of the work opposite to the punch contact side when the work surface is measured by a roughness meter after coining.

【図７】盛り上り部とレーザ溶接すべき部位（溶接ビー
ドとなる部位）の位置関係を変化させた場合のと溶接ビ
ードの荒れ発生状態を示す図である。FIG. 7 is a diagram showing a state in which roughness of a weld bead is generated when the positional relationship between a raised portion and a portion to be laser-welded (a portion to be a weld bead) is changed.

【図８】盛り上り部とレーザ溶接すべき部位（溶接ビー
ドとなる部位）の位置関係を変化させた場合のと溶接ビ
ードの荒れ発生状態を示す図である。FIG. 8 is a diagram illustrating a state in which roughness of a weld bead is generated when the positional relationship between a raised portion and a portion to be laser-welded (a portion serving as a weld bead) is changed.

【図９】良好な溶接ビードが得られるための、盛り上り
部とレーザ溶接すべき部位との位置関係の条件を示す図
である。FIG. 9 is a view showing conditions of a positional relationship between a raised portion and a portion to be laser-welded to obtain a good weld bead.

【図１０】従来の重ねレーザ溶接方法の、溶接ビード近
傍の、断面図である。FIG. 10 is a cross-sectional view showing the vicinity of a welding bead in a conventional lap laser welding method.

【符号の説明】[Explanation of symbols]

１１ 防錆鋼板 １１ａ メッキ部 １２ 防錆鋼板 １２ａ メッキ部 １３ 溶接ビード １４ 高圧ガス １５ 盛り上り部 １６ 凸形状部 １７ ポンチ １７ａ 円筒部 １７ｂ 基礎部 １８ 隙間 １９ 重ね合わせ部 ２０ レーザ光 ２１ プレス装置 ２２ 下型 ２３ 上型 ２４ 凹部 ２５ ポンチ受入れ凹部 ２６ パッド ２７ レーザ溶接すべき部位 ２８ スペーサ ２９ 台 ３０ ウレタン筒体 DESCRIPTION OF SYMBOLS 11 Rust-proof steel plate 11a Plated part 12 Rust-proof steel plate 12a Plated part 13 Weld bead 14 High pressure gas 15 Rising part 16 Convex part 17 Punch 17a Cylindrical part 17b Base part 18 Gap 19 Overlap part 20 Laser beam 21 Press device 22 Lower Mold 23 Upper mold 24 Concave part 25 Punch receiving concave part 26 Pad 27 Part to be laser-welded 28 Spacer 29 Base 30 Urethane cylinder

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 ２枚の防錆鋼板の重ねレーザ溶接方法で
あって、 先端に凸形状部を有するポンチの前記凸形状部により一
方の鋼板の一面に圧印加工を施して、該一面の圧印部周
囲に環状の盛り上り部および／または他面に山状の盛り
上り部を形成し、 一方の鋼板と他方の鋼板を前記盛り上り部による隙間を
もたせて重ね合せ、重ね合せ部にレーザ溶接を施す、重
ねレーザ溶接方法。1. A lap laser welding method for two rust-proof steel plates, wherein a stamping process is performed on one surface of one of the steel plates by using the convex portion of a punch having a convex portion at a tip end. An annular raised portion is formed around the portion and / or a mountain-shaped raised portion is formed on the other surface. One steel plate and the other steel plate are overlapped with a gap formed by the raised portion, and laser welding is performed on the overlapped portion. , Lap laser welding method. 【請求項２】 前記圧印加工が施される鋼板をプレス成
形するプレス装置の、前記鋼板のレーザ溶接が施される
部分を挟む２つの型のうち一方の型に、前記ポンチを、
ポンチ先端を型表面から突出させ型に該突出ポンチ先端
の周囲に型表面から後退した凹部を形成して、組み込ん
でおき、前記２つの型のうち他方の型の、前記ポンチに
対向する面を平坦面としておき、前記圧印加工が施され
る鋼板のプレス成形時に該プレス成形と同時に、前記圧
印加工が施される鋼板の前記２つの型で挟まれる部分に
前記盛り上り部を形成する請求項１記載の重ねレーザ溶
接方法。2. A press device for press-forming a steel plate to be subjected to the coining process, wherein the punch is formed into one of two dies that sandwich a portion of the steel plate to be subjected to laser welding.
The punch tip protrudes from the mold surface, and a recess is formed around the protruding punch tip in the mold, the recess being recessed from the mold surface, and the mold is incorporated. The other mold of the two molds faces the punch. The bulging portion is formed on a portion of the steel sheet to be subjected to the coining process, at the same time as the press forming, at a portion sandwiched between the two molds, while the flat surface is set as a flat surface. 2. The lap laser welding method according to 1. 【請求項３】 レーザ溶接すべき部位の長手方向と直交
方向に、前記盛り上り部の中心と前記レーザ溶接すべき
部位の中心との間隔が約３ｍｍ以内となり、かつ前記レ
ーザ溶接すべき部位の長手方向と平行方向に、盛り上り
部の中心間隔が約１０ｍｍ以内、前記レーザ溶接すべき
部位の端部と前記盛り上り部の中心との間隔が約５ｍｍ
以内となるように、前記圧印加工が施される鋼板に対す
る前記ポンチの位置を決定する請求項１記載の重ねレー
ザ溶接方法。3. A distance between a center of the raised portion and a center of the portion to be laser-welded is approximately 3 mm or less in a direction orthogonal to a longitudinal direction of the portion to be laser-welded, and In the direction parallel to the longitudinal direction, the distance between the centers of the raised portions is about 10 mm or less, and the distance between the end of the portion to be laser-welded and the center of the raised parts is about 5 mm.
The lap laser welding method according to claim 1, wherein the position of the punch with respect to the steel sheet to be subjected to the coining is determined so as to be within.
JP34722399A 1999-12-07 1999-12-07 Lap laser welding method Expired - Fee Related JP3614062B2 (en)

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JP2004082214A (en) * 2002-06-27 2004-03-18 Sumitomo Metal Ind Ltd Joining raw material, method for manufacturing the same, joined articles and method for manufacturing the same
US6797915B2 (en) * 2001-04-05 2004-09-28 Nothelfer Gmbh Method and device for joining coated metal sheets by means of laser welding
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JP2007038241A (en) * 2005-08-02 2007-02-15 Nisshin Steel Co Ltd Welding method for galvanized steel sheet
US7319205B2 (en) * 2005-08-05 2008-01-15 Honda Motor Co., Ltd. Laser welding method and device
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WO2014126172A1 (en) * 2013-02-15 2014-08-21 日産自動車株式会社 Laser welding method, laser welding device, and welded member
JP2016032421A (en) * 2014-07-30 2016-03-07 株式会社デンソー Rotor of dynamo-electric machine and dynamo-electric machine
CN106102984A (en) * 2014-04-15 2016-11-09 白木工业株式会社 The method for laser welding of sheet-metal layers stack and employ the manufacture method of vehicle door frame of method for laser welding of sheet-metal layers stack
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US6797915B2 (en) * 2001-04-05 2004-09-28 Nothelfer Gmbh Method and device for joining coated metal sheets by means of laser welding
JP2004082214A (en) * 2002-06-27 2004-03-18 Sumitomo Metal Ind Ltd Joining raw material, method for manufacturing the same, joined articles and method for manufacturing the same
JP2009255179A (en) * 2002-06-27 2009-11-05 Sumitomo Metal Ind Ltd Material for welding, weld product and automobile body
FR2884448A1 (en) * 2005-04-18 2006-10-20 Renault Sas METHOD FOR ASSEMBLING LASER WELDING BY TRANSPARENCY OF SHEETS COVERED WITH A PROCESS LAYER
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JP2007038241A (en) * 2005-08-02 2007-02-15 Nisshin Steel Co Ltd Welding method for galvanized steel sheet
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FR2939342A1 (en) * 2008-12-09 2010-06-11 Peugeot Citroen Automobiles Sa METHOD AND DEVICE FOR ASSEMBLING TWO SHEETS BY LASER WELDING, IN PARTICULAR TO ASSEMBLE THE SHEET FOR FRAMING A MOTOR VEHICLE DOOR WITH THE LINING OF THIS DOOR
WO2014126172A1 (en) * 2013-02-15 2014-08-21 日産自動車株式会社 Laser welding method, laser welding device, and welded member
JP5958638B2 (en) * 2013-02-15 2016-08-02 日産自動車株式会社 Laser welding method and laser welding apparatus
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CN106102984A (en) * 2014-04-15 2016-11-09 白木工业株式会社 The method for laser welding of sheet-metal layers stack and employ the manufacture method of vehicle door frame of method for laser welding of sheet-metal layers stack
JP2016032421A (en) * 2014-07-30 2016-03-07 株式会社デンソー Rotor of dynamo-electric machine and dynamo-electric machine
WO2019163949A1 (en) * 2018-02-26 2019-08-29 三菱電機株式会社 Lap welding method, and plate-shaped member
JPWO2019163949A1 (en) * 2018-02-26 2020-09-24 三菱電機株式会社 Superposition welding method and plate-shaped member

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