JPH0780669A - Laser beam welding method - Google Patents
Laser beam welding methodInfo
- Publication number
- JPH0780669A JPH0780669A JP5226145A JP22614593A JPH0780669A JP H0780669 A JPH0780669 A JP H0780669A JP 5226145 A JP5226145 A JP 5226145A JP 22614593 A JP22614593 A JP 22614593A JP H0780669 A JPH0780669 A JP H0780669A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- laser beam
- laser
- center line
- steel sheets
- 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
Links
Landscapes
- Laser Beam Processing (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、亜鉛や樹脂などで表面
処理が施された鋼板の溶接に好適に用いられるレーザ溶
接方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser welding method suitably used for welding a steel sheet surface-treated with zinc or resin.
【０００２】[0002]
【従来の技術】母材となる鋼板よりも融点の低い亜鉛や
樹脂等で表面処理が施された鋼板を相互に重ね合わせて
溶接を行うと、前記亜鉛や樹脂などの被覆材の蒸気によ
って、モルトンプールと称される溶融池の安定した形成
が妨げられるので、溶接部分に吹き出しやブローホール
等の溶接不良を生じることがある。2. Description of the Related Art When steel sheets having surface treatments such as zinc or resin having a melting point lower than that of a base steel sheet are superposed on each other and welded, steam of a coating material such as zinc or resin causes Since stable formation of a molten pool called a molton pool is hindered, a welding defect such as blowout or a blow hole may occur in the welded portion.
【０００３】このような不具合を解決するための典型的
な従来技術は、特開昭６０−４９８８７で示される。こ
の従来技術は、レーザ光を出射するレーザノズルの側方
に吸引ノズルを設け、被覆材の蒸気を吸引するようにし
たものである。A typical conventional technique for solving such a problem is disclosed in JP-A-60-49887. In this conventional technique, a suction nozzle is provided on the side of a laser nozzle that emits laser light to suck the vapor of the coating material.
【０００４】また他の従来技術として、特開昭６０−２
５５２９４が挙げられる。この従来技術は、重ね合わせ
られる鋼板の溶接部付近で、少なくともいずれか一方の
鋼板に塑成変形によって突起を形成しておき、被覆材の
蒸気を、この突起によって形成された層間の隙間から排
出するようにしたものである。As another conventional technique, Japanese Patent Laid-Open No. 60-2 is available.
55294. In this conventional technique, a protrusion is formed on at least one of the steel plates by plastic deformation in the vicinity of the welded portion of the steel plates to be overlapped, and the vapor of the coating material is discharged from the gap between the layers formed by the protrusion. It is something that is done.
【０００５】[0005]
【発明が解決しようとする課題】上述の各従来技術で
は、レーザ溶接装置に加えて、被覆材の蒸気を吸引する
ための装置や、鋼板に塑成変形を行うための装置などの
他の装置が必要となり、また前処理の工程が必要となる
場合がある。したがってコストが嵩むとともに、レーザ
溶接の利点である高速性が損なわれてしまい、効率が悪
いという問題がある。In each of the above-mentioned prior arts, in addition to the laser welding device, other devices such as a device for sucking vapor of the coating material and a device for plastically deforming the steel sheet. May be required, and a pretreatment step may be required. Therefore, there is a problem that the cost is increased and the high speed, which is an advantage of laser welding, is impaired, resulting in poor efficiency.
【０００６】本発明の目的は、低コストで、効率良く溶
接を行うことができるレーザ溶接方法を提供することで
ある。An object of the present invention is to provide a laser welding method which can perform welding efficiently at low cost.
【０００７】[0007]
【課題を解決するための手段】本発明は、母材より融点
の低い被覆材で被覆された被接合材を重ね合わせ、レー
ザ光を照射して溶接を行うレーザ溶接方法において、溶
接すべき箇所、あるいはその近傍に、予めレーザ光で局
所的にスポット溶接を行った後、本溶接を行うことを特
徴とするレーザ溶接方法である。DISCLOSURE OF THE INVENTION According to the present invention, in a laser welding method in which a material to be joined which is coated with a coating material having a melting point lower than that of a base material is superposed, and a laser beam is irradiated to perform welding, a portion to be welded Or in the vicinity thereof, spot welding is previously performed locally by laser light, and then main welding is performed, which is a laser welding method.
【０００８】[0008]
【作用】本発明に従えば、母材より融点の低い被覆材で
被覆された、たとえば亜鉛メッキや樹脂コーティングの
施された鋼板などの被接合材を、重ね合わせてレーザ光
線を照射することによって溶接を行うにあたって、溶接
すべき箇所、あるいはその近傍に、予めレーザ光で局所
的にスポット溶接を行った後、本溶接を行う。According to the present invention, by joining a material to be joined, such as a galvanized or resin-coated steel sheet coated with a coating material having a melting point lower than that of the base material, and irradiating it with a laser beam. When performing welding, spot welding is previously performed locally with a laser beam on a portion to be welded or in the vicinity thereof, and then main welding is performed.
【０００９】前記スポット溶接による歪によって、その
溶接箇所の周辺近傍の合せ面は相互に離間し、僅かな隙
間が生じる。したがって、その後のレーザ光の照射によ
る本溶接時に発生する前記被覆材の蒸気は、溶接箇所の
周囲に充満することなく、この隙間から放散される。Due to the distortion caused by the spot welding, the mating surfaces in the vicinity of the periphery of the welding location are separated from each other, and a slight gap is generated. Therefore, the vapor of the coating material generated at the time of the main welding due to the subsequent irradiation of laser light is diffused from this gap without filling the periphery of the welding portion.
【００１０】したがって、前記蒸気を放散させるために
特別な装置を用いることなく、また特別な前加工などを
行う必要はなく、低コストで、しかもレーザ溶接の高速
性を生かして効率良く溶接を行うことが可能となる。Therefore, it is possible to perform welding efficiently without using a special device for dissipating the vapor, and without the need for special pre-processing, at low cost, and by utilizing the high speed of laser welding. It becomes possible.
【００１１】[0011]
【実施例】図１は、本発明の一実施例のレーザ溶接方法
を説明するための斜視図であり、図２は図１（１）の切
断面線Ａ−Ａから見た断面図である。被接合材である表
面処理鋼板１，１１は、相互に積み重ねられて、以下に
示すようにしてレーザ光によって溶接が行われる。1 is a perspective view for explaining a laser welding method according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1 (1). . The surface-treated steel sheets 1 and 11 which are the materials to be joined are stacked on each other and welded by laser light as described below.
【００１２】各表面処理鋼板１，１１は、図２で拡大し
て示すように、母材である鋼板２，１２の両表面２ａ，
２ｂ；１２ａ，１２ｂに、それぞれ防錆のための被覆材
である亜鉛メッキ層３ａ，３ｂ；１３ａ，１３ｂが付着
形成されて構成されている。Each of the surface-treated steel sheets 1 and 11 is, as shown in an enlarged manner in FIG.
2b; 12a, 12b are respectively formed with zinc plating layers 3a, 3b; 13a, 13b which are coating materials for rust prevention.
【００１３】これらの表面処理鋼板１，１１を重ね合わ
せて溶接するにあたって、まず図１（１）で示されるよ
うに、参照符４で示される本溶接の中心線上において、
またはこの中心線４の近傍で、予め定める間隔Ｌ１をあ
けて局所的に、参照符５，６で示されるようにスポット
溶接が行われる。これによって生じる歪によって、表面
処理鋼板１，１１は、スポット溶接箇所５，６を中心と
して、前記中心線４上となる部分が、図２において参照
符Ｌ２で示されるように、相互に僅かな隙間７を隔てて
離間する。When these surface-treated steel sheets 1 and 11 are overlapped and welded, first, as shown in FIG. 1A, on the center line of the main welding indicated by reference numeral 4,
Alternatively, spot welding is locally performed in the vicinity of the center line 4 with a predetermined interval L1 as shown by reference numerals 5 and 6. Due to the distortion caused by this, in the surface-treated steel sheets 1 and 11, the portions on the center line 4 centering on the spot welded portions 5 and 6 are slightly different from each other, as indicated by reference numeral L2 in FIG. The gap 7 is separated.
【００１４】なお、前記間隔Ｌ１は、２枚の表面処理鋼
板１，１１のうち、上側に積み重ねられる表面処理鋼板
（図１および図２の場合には表面処理鋼板１）の剛性な
どに基づいて決定される。すなわち、板厚が薄いときに
は、たわみが生じやすいので前記間隔Ｌ１は小さく選ば
れ、こうしてスポット溶接箇所５，６のほぼ中間位置付
近でも、表面処理鋼板１，１１間の隙間７の間隔Ｌ２
が、たとえば０．１ｍｍ以上とされる。The interval L1 is based on the rigidity of the surface-treated steel sheet (the surface-treated steel sheet 1 in the case of FIGS. 1 and 2) stacked on the upper side of the two surface-treated steel sheets 1 and 11. It is determined. That is, when the plate thickness is thin, deflection is likely to occur, so the interval L1 is selected to be small, and thus the interval L2 of the gap 7 between the surface-treated steel plates 1 and 11 is also near the intermediate position between the spot welding points 5 and 6.
Is, for example, 0.1 mm or more.
【００１５】このようにして、亜鉛メッキ層３ｂ，１３
ａから発生する蒸気を放散するための流路となる隙間７
が形成されると、図１（２）で示されるように、前記中
心線４上に沿って連続してレーザ光が照射され、本溶接
が行われる。In this way, the galvanized layers 3b and 13 are formed.
A gap 7 that serves as a flow path for dissipating the steam generated from a.
After the formation, the laser beam is continuously irradiated along the center line 4 to perform the main welding, as shown in FIG. 1 (2).
【００１６】図３は、本発明の一実施例のレーザ溶接装
置２１の断面図である。このレーザ溶接装置２１は、大
略的に、レーザ発振器２２と、加工ヘッド２３とを備え
て構成されている。加工ヘッド２３へは、レーザ発振器
２２から出力されたレーザ光が、導波路２５を介して入
力される。加工ヘッド２３は、筒体が略Ｌ字状に屈曲さ
れて形成されるケーシング２６を有し、そのケーシング
２６の屈曲部付近には、前記レーザ光を集光するための
凹面鏡２７が設けられている。FIG. 3 is a sectional view of a laser welding apparatus 21 according to an embodiment of the present invention. The laser welding device 21 is generally configured to include a laser oscillator 22 and a processing head 23. The laser light output from the laser oscillator 22 is input to the processing head 23 via the waveguide 25. The processing head 23 has a casing 26 formed by bending a cylindrical body into a substantially L shape, and a concave mirror 27 for converging the laser light is provided near the bent portion of the casing 26. There is.
【００１７】前記導波路２５を介して加工ヘッド２３に
入力されたレーザ光は、入射口２８から前記凹面鏡２７
に入射し、集光されて出射口２９から出力される。この
ように構成されるレーザ溶接装置２１の前記凹面鏡２７
の焦点付近に前記中心線４が位置するように、相互に重
ね合わせられて加工台３０上に載置された表面処理鋼板
１，１１が配置される。The laser light input to the processing head 23 via the waveguide 25 is input from the entrance 28 to the concave mirror 27.
Is incident on, condensed and output from the emission port 29. The concave mirror 27 of the laser welding device 21 configured as described above
The surface-treated steel plates 1 and 11 placed on the working table 30 and superposed on each other are arranged so that the center line 4 is located near the focal point of the.
【００１８】このように本発明に従う溶接方法では、レ
ーザ光を照射すべき中心線４上またはその近傍に、予め
スポット溶接を行った後、本溶接を行うので、該溶接工
程の前工程で表面処理鋼板１，１１への塑成変形などの
前加工を不要とすることができ、また溶接時に亜鉛メッ
キ層３ａ，３ｂ；１３ａ，１３ｂから発生する蒸気を吸
引するための特別な構成を設ける必要がなく、こうして
低コストで、しかもレーザ溶接の利点である高速性を生
かして効率良く溶接を行うことができる。As described above, in the welding method according to the present invention, the spot welding is performed in advance on or near the center line 4 to be irradiated with the laser beam, and then the main welding is performed. Pre-processing such as plastic deformation to the treated steel sheets 1 and 11 can be eliminated, and a special structure for sucking vapor generated from the galvanized layers 3a and 3b; 13a and 13b at the time of welding needs to be provided. Thus, it is possible to perform welding efficiently at low cost and by taking advantage of the high speed that is an advantage of laser welding.
【００１９】また、前記スポット溶接を行うことによっ
て、仮止めのためのクランプ装置などの治具を不要とす
ることができる。さらにまた、スポット溶接箇所５，６
を、図１（２）において参照符８で示されるような、レ
ーザ光の照射によって一旦溶解した後、再凝固するビー
ド部分に形成することによって、表面の外観を損なうこ
となく、美しく仕上げることができる。Further, by performing the spot welding, it is possible to eliminate the need for a jig such as a clamp device for temporary fixing. Furthermore, spot welding points 5, 6
Is formed in a bead portion that is once melted by irradiation with laser light and then re-solidified as shown by reference numeral 8 in FIG. 1 (2), so that a beautiful finish can be achieved without impairing the appearance of the surface. it can.
【００２０】[0020]
【発明の効果】以上のように本発明によれば、亜鉛メッ
キ鋼板などの被覆材で被覆された被接合材を重ね合わせ
て溶接するにあたって、溶接すべき箇所、あるいはその
近傍に、予めレーザ光を局所的に照射してスポット溶接
を行って、被接合材を相互に僅かに離間させた状態で本
溶接を行うので、被覆材の蒸気を放散させるために特別
な装置や特別な前加工が不要となり、低コスト化を図る
ことができるとともに、レーザ溶接の利点である高速性
を生かして効率良く溶接を行うことができる。As described above, according to the present invention, when the materials to be joined which are coated with the coating material such as the galvanized steel sheet are superposed and welded, a laser beam is preliminarily provided at or near the portion to be welded. Is locally irradiated to perform spot welding, and the main welding is performed with the materials to be joined slightly separated from each other, so a special device or special preprocessing is required to dissipate the vapor of the coating material. It is not necessary and the cost can be reduced, and welding can be efficiently performed by utilizing the advantage of laser welding that is high speed.
【図１】本発明の一実施例のレーザ溶接方法を説明する
ための斜視図である。FIG. 1 is a perspective view for explaining a laser welding method according to an embodiment of the present invention.
【図２】図１（１）の切断面線Ａ−Ａから見た断面図で
ある。FIG. 2 is a cross-sectional view taken along the section line AA of FIG.
【図３】本発明の一実施例のレーザ溶接装置２１の断面
図である。FIG. 3 is a sectional view of a laser welding device 21 according to an embodiment of the present invention.
１，１１ 表面処理鋼板 ２，１２ 鋼板 ３ａ，３ｂ；１３ａ，１３ｂ 亜鉛メッキ層 ４ 中心線 ５，６ スポット溶接箇所 ７ 隙間 ８ ビード部分 ２１ レーザ溶接装置 ２２ レーザ発振器 ２３ 加工ヘッド ２７ 凹面鏡 1, 11 Surface-treated steel plate 2, 12 Steel plate 3a, 3b; 13a, 13b Zinc plating layer 4 Center line 5, 6 Spot welding spot 7 Gap 8 Bead portion 21 Laser welding device 22 Laser oscillator 23 Processing head 27 Concave mirror
───────────────────────────────────────────────────── フロントページの続き (72)発明者 犬塚 雅之 兵庫県神戸市中央区東川崎町３丁目１番１ 号 川崎重工業株式会社神戸工場内 (72)発明者 中澤 裕 兵庫県神戸市中央区東川崎町３丁目１番１ 号 川崎重工業株式会社神戸工場内 (72)発明者 長谷 浩志 兵庫県神戸市中央区東川崎町３丁目１番１ 号 川崎重工業株式会社神戸工場内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masayuki Inuzuka 3-1, 1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries Ltd. Kobe factory (72) Inventor Yu Nakazawa Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo 3-1-1 Kawasaki Heavy Industries, Ltd. Kobe factory (72) Inventor Hiroshi Hase 3-1-1 1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries Ltd. Kobe factory
Claims (1)
被接合材を重ね合わせ、レーザ光を照射して溶接を行う
レーザ溶接方法において、 溶接すべき箇所、あるいはその近傍に、予めレーザ光で
局所的にスポット溶接を行った後、本溶接を行うことを
特徴とするレーザ溶接方法。1. In a laser welding method in which materials to be joined, which are coated with a coating material having a melting point lower than that of a base material, are superposed and welded by irradiating a laser beam, a laser is preliminarily provided at a portion to be welded or in the vicinity thereof. A laser welding method, which comprises performing spot welding locally by light and then performing main welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5226145A JP2728623B2 (en) | 1993-09-10 | 1993-09-10 | Laser welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5226145A JP2728623B2 (en) | 1993-09-10 | 1993-09-10 | Laser welding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0780669A true JPH0780669A (en) | 1995-03-28 |
| JP2728623B2 JP2728623B2 (en) | 1998-03-18 |
Family
ID=16840568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5226145A Expired - Fee Related JP2728623B2 (en) | 1993-09-10 | 1993-09-10 | Laser welding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2728623B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002051580A1 (en) * | 2000-12-22 | 2002-07-04 | Koninklijke Philips Electronics N.V. | Method of laser welding |
| JP2007167916A (en) * | 2005-12-22 | 2007-07-05 | Aisin Takaoka Ltd | Welding method for lap joint |
| US7385157B2 (en) | 2001-04-27 | 2008-06-10 | Honda Giken Kogyo Kabushiki Kaisha | Laser beam welding method and apparatus |
| JP2008178905A (en) * | 2007-01-26 | 2008-08-07 | Nippon Steel Corp | Laser welding method for structure composed of steel plate |
| JP2011089634A (en) * | 2009-09-25 | 2011-05-06 | Seiko Instruments Inc | Method of manufacturing rolling bearing device |
| CN102240852A (en) * | 2011-05-20 | 2011-11-16 | 无锡汉神电气有限公司 | Laser stitch welding device for galvanized plate |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60145295A (en) * | 1984-01-06 | 1985-07-31 | Toshiba Corp | Laser welding device |
| JPH04231190A (en) * | 1990-12-28 | 1992-08-20 | Fanuc Ltd | Method and device for laser welding galvanized steel sheet |
-
1993
- 1993-09-10 JP JP5226145A patent/JP2728623B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60145295A (en) * | 1984-01-06 | 1985-07-31 | Toshiba Corp | Laser welding device |
| JPH04231190A (en) * | 1990-12-28 | 1992-08-20 | Fanuc Ltd | Method and device for laser welding galvanized steel sheet |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002051580A1 (en) * | 2000-12-22 | 2002-07-04 | Koninklijke Philips Electronics N.V. | Method of laser welding |
| CN1325220C (en) * | 2000-12-22 | 2007-07-11 | 皇家菲利浦电子有限公司 | Method of laser welding |
| KR100845911B1 (en) * | 2000-12-22 | 2008-07-11 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | Method of laser welding |
| US7385157B2 (en) | 2001-04-27 | 2008-06-10 | Honda Giken Kogyo Kabushiki Kaisha | Laser beam welding method and apparatus |
| JP2007167916A (en) * | 2005-12-22 | 2007-07-05 | Aisin Takaoka Ltd | Welding method for lap joint |
| JP4593458B2 (en) * | 2005-12-22 | 2010-12-08 | アイシン高丘株式会社 | Welding method of lap joint |
| JP2008178905A (en) * | 2007-01-26 | 2008-08-07 | Nippon Steel Corp | Laser welding method for structure composed of steel plate |
| JP2011089634A (en) * | 2009-09-25 | 2011-05-06 | Seiko Instruments Inc | Method of manufacturing rolling bearing device |
| CN102240852A (en) * | 2011-05-20 | 2011-11-16 | 无锡汉神电气有限公司 | Laser stitch welding device for galvanized plate |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2728623B2 (en) | 1998-03-18 |
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| LAPS | Cancellation because of no payment of annual fees |