JPH05245670A - Method for welding high damping steel sheets with laser beam - Google Patents
Method for welding high damping steel sheets with laser beamInfo
- Publication number
- JPH05245670A JPH05245670A JP4051824A JP5182492A JPH05245670A JP H05245670 A JPH05245670 A JP H05245670A JP 4051824 A JP4051824 A JP 4051824A JP 5182492 A JP5182492 A JP 5182492A JP H05245670 A JPH05245670 A JP H05245670A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- laser beam
- damping steel
- resin layer
- butt
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、制振鋼板の突合せ継手
のブローホールを防止した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 capable of preventing blowholes in a butt joint of a damping steel plate.
【０００２】[0002]
【従来の技術】制振鋼板は２枚の鋼板の間に薄い樹脂層
をサンドイッチした構造を持つ複合材料であり、防音・
防振機能を有するため振動発生源の筐体等に幅広く利用
されている。かかる制振鋼板を突合せ溶接する場合、中
間の樹脂層が絶縁物であるため、アーク溶接ではアーク
が不安定になり、また溶接熱により樹脂層が蒸発し、そ
の樹脂の蒸気が溶融金属中に混入して継手に多数のブロ
ーホールやピットなどを発生させる。したがって、アー
ク溶接で制振鋼板の突合せ溶接をすることはほとんど不
可能であり、通常は、例えば特公平６２−１９７５３号
公報に示すように、連結のための普通鋼板を用い、この
普通鋼板と制振鋼板を重ね隅肉継手で溶接する方法をと
っている。しかしながら、このような従来法では連結用
の普通鋼板が必要なため、溶接個所が増加するだけでな
く、この部分で制振性能を低下させたり、板厚が厚くな
ったりする。2. Description of the Related Art A vibration-damping steel plate is a composite material having a structure in which a thin resin layer is sandwiched between two steel plates.
Since it has an anti-vibration function, it is widely used as a housing of a vibration source. When butt-welding such damping steel plates, since the intermediate resin layer is an insulator, the arc becomes unstable in arc welding, and the resin layer evaporates due to the welding heat, and the vapor of the resin becomes molten metal. When mixed, many blow holes and pits are generated in the joint. Therefore, it is almost impossible to butt-weld a vibration-damping steel plate by arc welding, and normally, as shown in Japanese Patent Publication No. 62-19753, a normal steel plate for connection is used, and A method of welding vibration-damping steel plates with overlapping fillet joints is used. However, in such a conventional method, since ordinary steel plates for connection are required, not only the number of welded portions increases, but also the vibration damping performance deteriorates and the plate thickness increases at this portion.
【０００３】一方、レーザ溶接で制振鋼板の突合せ溶接
をした場合、上記アーク溶接と同様に樹脂が蒸発し、そ
の蒸気が溶融池内に侵入し、継手の欠陥が発生する。On the other hand, when butt-welding a vibration-damping steel plate is performed by laser welding, the resin evaporates as in the case of the arc welding, the vapor penetrates into the molten pool, and a joint defect occurs.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、レーザ
溶接の場合、高速度でかつ狭ビード幅で溶接すると、樹
脂の蒸発量が減少するため制振鋼板の突合せ溶接が可能
になるが、反面、樹脂の蒸発した炭素を溶接部に含有す
る結果、溶接部の炭素含有量が多くなって継手の延性が
大きく低下するという課題があった。However, in the case of laser welding, when welding at a high speed and a narrow bead width, the evaporation amount of the resin decreases, so that it is possible to butt-weld vibration-damping steel sheets. As a result of containing the vaporized carbon of the above in the welded portion, there was a problem that the carbon content of the welded portion increased and the ductility of the joint significantly decreased.
【０００５】本発明は、上記のような突合せ継手の欠陥
を防止するとともに、継手の延性を向上させることがで
きる制振鋼板のレーザ溶接方法を得ることを目的とす
る。It is an object of the present invention to provide a laser welding method for a vibration damping steel plate which can prevent the above defects of the butt joint and improve the ductility of the joint.
【０００６】[0006]
【課題を解決するための手段】本発明に係る制振鋼板の
レーザ溶接方法は、制振鋼板同士または制振鋼板と通常
の金属板との突合せレーザ溶接法であって、その突合せ
部の樹脂層を、まずデフォーカスレーザビームの照射で
蒸発させて除去し、しかるのちフォーカスレーザビーム
（溶接用の集光レーザビーム）で該突合せ部を溶接する
こととしたものである。A method for laser-damping a vibration-damping steel plate according to the present invention is a butt-laser welding method between vibration-damping steel plates or a vibration-damping steel plate and a normal metal plate, and a resin of the butt portion is a resin. The layer is first evaporated and removed by irradiation with a defocus laser beam, and then the abutting portion is welded with a focus laser beam (focusing laser beam for welding).
【０００７】[0007]
【作用】突合せ部にデフォーカスレーザビームを照射す
ることにより、その予熱効果で突合せ部近傍の樹脂層が
蒸発し除去される。その後、通常のフォーカスレーザビ
ームで溶接すれば、樹脂の蒸気が溶融池内に侵入するこ
とがなく、継手の炭素含有量が著しく減少する。よっ
て、継手の延性が向上し、欠陥の少ない良好な継手が得
られる。By irradiating the abutting portion with the defocused laser beam, the resin layer in the vicinity of the abutting portion is evaporated and removed by its preheating effect. After that, if welding is performed with a normal focus laser beam, the resin vapor does not enter the molten pool, and the carbon content of the joint is significantly reduced. Therefore, the ductility of the joint is improved, and a good joint with few defects can be obtained.
【０００８】[0008]
【実施例】図１は本発明の一実施例を示す説明図であ
り、図中、１，２は突合せ部３を構成する制振鋼板、４
は制振鋼板１，２の樹脂層である。まず、図１（ａ）の
ように制振鋼板１と制振鋼板２を突き合わせ、その突合
せ部３にデフォーカスレーザビーム１０を照射する。突
合せ部３はデフォーカスレーザビーム１０の照射により
４００℃程度以上に予熱されるため、突合せ部３近傍の
樹脂層４が蒸発し、その蒸気５は矢印で示すように突合
せ部３の隙間を通って外部に排出され、後に樹脂が除去
された空洞部６が残る。なお、樹脂の蒸気を排出しやす
くするため、突合せ部３の隙間を少しあけ、溶接時に正
常の突合せ状態にセットするという方法でもよい。次い
で、図１（ｂ）に示すように、集光した溶接用のフォー
カスレーザビーム１１で樹脂層４の除去された突合せ部
３を溶接する。突合せ部３には樹脂層４が無いため、溶
接時、樹脂の蒸気はほとんど発生しない。したがって、
溶融池内に樹脂の蒸気が侵入することもなく、樹脂中の
炭素が固溶することもないので、突合せ継手７にブロー
ホールやピット等の欠陥が発生せず、良好なビード形状
が得られる。また継手７の炭素含有量が低減する結果、
継手７の延性も母材レベル程度に向上する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view showing an embodiment of the present invention, in which 1 and 2 are damping steel plates constituting a butt portion 3 and 4
Is a resin layer of the damping steel plates 1 and 2. First, as shown in FIG. 1A, the damping steel plate 1 and the damping steel plate 2 are butted, and the butted portion 3 is irradiated with the defocus laser beam 10. Since the butt section 3 is preheated to about 400 ° C. or more by the irradiation of the defocus laser beam 10, the resin layer 4 near the butt section 3 evaporates, and the vapor 5 passes through the gap of the butt section 3 as shown by the arrow. Is discharged to the outside, and the cavity 6 from which the resin has been removed remains. In order to facilitate discharge of the resin vapor, a method may be used in which a small gap is formed in the butt portion 3 and a normal butt state is set during welding. Next, as shown in FIG. 1B, the butt portion 3 from which the resin layer 4 has been removed is welded by the focused focus laser beam 11 for welding. Since the butt portion 3 does not have the resin layer 4, resin vapor is hardly generated during welding. Therefore,
Since the vapor of the resin does not enter the molten pool and the carbon in the resin does not form a solid solution, defects such as blow holes and pits do not occur in the butt joint 7, and a good bead shape can be obtained. Further, as a result of the carbon content of the joint 7 being reduced,
The ductility of the joint 7 is also improved to the level of the base metal.
【０００９】なお、レーザビームは１つの溶接ヘッドで
最初はデフォーカスビームに、次いでフォーカスビーム
にするといった方法で照射してもよいし、複数の溶接ヘ
ッドをタンデムに配置し、先行溶接ヘッドをデフォーカ
スビーム用に、後行溶接ヘッドをフォーカスビーム用と
して実施してもよい。突合せ溶接されるべき母材は、少
なくとも一方が制振鋼板であればよく、実施例のように
制振鋼板同士だけでなく、制振鋼板と通常の金属板との
突合せ溶接にも本発明を適用することができる。The laser beam may be radiated from one welding head to a defocused beam first, and then to a focused beam, or a plurality of welding heads may be arranged in tandem to decouple the preceding welding head. For the focus beam, a trailing welding head may be implemented for the focus beam. At least one of the base materials to be butt-welded may be a vibration-damping steel plate, and the present invention is not limited to the vibration-damping steel plates as in the embodiment, but may be applied to the butt-welding of the vibration-damping steel plate and a normal metal plate. Can be applied.
【００１０】次に具体的実施例について述べる。母材材
料及びレーザ照射条件を下記のとおりとして実験した。 ａ．母材材料 Ａ：熱硬化性樹脂制振鋼板（エポキシ樹脂層の制振鋼
板）（鋼板０．４mm厚×樹脂層５０μｍ厚×鋼板０．４
mm厚） Ｂ：熱可塑性樹脂制振鋼板（ポリエチレン樹脂層の制振
鋼板）（鋼板０．４mm厚×樹脂層５０μｍ厚×鋼板０．
４mm厚） ｂ．レーザ照射条件 (i) デフォーカスビーム ＣＯ2 レーザ 出力２ｋｗ ビーム径 ３mm ビーム走査速度 ４ｍ／min (ii)フォーカスビーム ＣＯ2 レーザ 出力３ｋｗ ビーム径 ０．２mm ビーム走査速度 １〜１２ｍ／min 実験結果を図２に示す。図２は従来法と本発明法を比較
したものであり、欠陥の無い継手が得られるビーム走査
速度の範囲を斜線部で示してある。なお、従来法は上記
ｂ(i) は適用せず、直接ｂ(ii)の条件で溶接を実施した
ものである。また、表１に溶接部のビッカース硬さ、炭
素含有量（ｗｔ／％），全伸び（％），及び欠陥の有無
について比較した結果を示す。ただし、レーザ出力３ｋ
ｗ，溶接速度６ｍ／min の条件で突合せ継手を作成し、
その引張試験片は図３に示すように、ＪＩＳ Ｚ ２２
０１により作成した。Next, concrete examples will be described. An experiment was conducted with the base material and laser irradiation conditions as follows. a. Base material A: Thermosetting resin damping steel plate (damping steel plate of epoxy resin layer) (steel plate 0.4 mm thickness × resin layer 50 μm thickness × steel plate 0.4)
mm thickness) B: Thermoplastic resin damping steel sheet (polyethylene resin layer damping steel sheet) (steel sheet 0.4 mm thickness x resin layer 50 μm thickness x steel sheet 0.
4 mm thick) b. Laser irradiation conditions (i) Defocused beam CO 2 laser output 2 kw, beam diameter 3 mm, beam scanning speed 4 m / min (ii) Focus beam CO 2 laser output 3 kw, beam diameter 0.2 mm, beam scanning speed 1 to 12 m / min 2 shows. FIG. 2 is a comparison between the conventional method and the method of the present invention, in which the range of the beam scanning speed at which a joint having no defect is obtained is indicated by a hatched portion. In the conventional method, b (i) is not applied, and welding is performed directly under the condition of b (ii). Table 1 shows the results of comparison of Vickers hardness, carbon content (wt /%), total elongation (%), and presence / absence of defects of welded portions. However, laser output 3k
w, create a butt joint under the conditions of welding speed 6m / min,
The tensile test piece is, as shown in FIG. 3, JIS Z 22.
01.
【００１１】[0011]
【表１】 [Table 1]
【００１２】図２から明らかなように、本発明法は従来
法に比べて無欠陥継手を得るビーム走査速度の適用範囲
が著しく広い。溶接速度を従来以上に速くできる。ま
た、表１によれば、本発明法では継手の炭素含有量及び
硬さが著しく低減しており、全伸びが母材と同じになっ
た。As is apparent from FIG. 2, the method of the present invention has a remarkably wider range of application of the beam scanning speed for obtaining a defect-free joint than the conventional method. Welding speed can be faster than before. Further, according to Table 1, in the method of the present invention, the carbon content and hardness of the joint were remarkably reduced, and the total elongation was the same as that of the base metal.
【００１３】[0013]
【発明の効果】以上のように本発明によれば、溶接条件
の適用範囲が大巾に拡大し、突合せ継手の延性が母材レ
ベルに向上するという効果が得られる。また、本発明は
突合せ部の樹脂層を実際のレーザ溶接に先立って物理的
に除去するものであるから、除去された樹脂層の範囲が
狭く、かつ狭ビード幅で溶接できるため、制振性能を低
下させることなく効率の良い良好な突合せ溶接ができ
る。As described above, according to the present invention, the range of application of welding conditions is greatly expanded, and the ductility of the butt joint is improved to the base metal level. Further, since the present invention physically removes the resin layer of the abutting portion prior to actual laser welding, the range of the removed resin layer is narrow, and since it is possible to weld with a narrow bead width, vibration damping performance is obtained. Butt welding with good efficiency can be achieved without reducing
【図１】本発明の一実施例を示す説明図である。FIG. 1 is an explanatory diagram showing an embodiment of the present invention.
【図２】本発明法と従来法のビーム走査速度の比較結果
を示す図である。FIG. 2 is a diagram showing a comparison result of beam scanning speeds of the method of the present invention and the conventional method.
【図３】突合せ継手の引張試験片を示す図である。FIG. 3 is a view showing a tensile test piece of a butt joint.
１，２ 制振鋼板 ３ 突合せ部 ４ 樹脂層 ５ 樹脂の蒸気 ６ 空洞部（樹脂除去部） ７ 突合せ継手 １０ デフォーカスレーザビーム １１ フォーカスレーザビーム 1, 2 Damping steel plate 3 Butt part 4 Resin layer 5 Resin vapor 6 Cavity part (resin removal part) 7 Butt joint 10 Defocus laser beam 11 Focus laser beam
Claims (1)
せ部近傍の樹脂層を蒸発させて除去した後、フォーカス
レーザビームで該突合せ部を溶接することを特徴とする
制振鋼板のレーザ溶接方法。1. In butt welding of vibration-damping steel plates, the butt portion is irradiated with a defocus laser beam, the resin layer in the vicinity of the butt portion is evaporated and removed, and then the butt portion is welded with the focus laser beam. A method for laser-damping a vibration-damping steel plate, characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4051824A JP2713000B2 (en) | 1992-03-10 | 1992-03-10 | Laser welding method of damping steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4051824A JP2713000B2 (en) | 1992-03-10 | 1992-03-10 | Laser welding method of damping steel plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05245670A true JPH05245670A (en) | 1993-09-24 |
| JP2713000B2 JP2713000B2 (en) | 1998-02-16 |
Family
ID=12897640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4051824A Expired - Fee Related JP2713000B2 (en) | 1992-03-10 | 1992-03-10 | Laser welding method of damping steel plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2713000B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10315976A1 (en) * | 2003-04-08 | 2004-10-21 | Volkswagen Ag | To prepare coated metal sheets for soldering/welding, for vehicle bodywork parts, the surface coating is removed by a laser beam at the joint surface zones |
| JP2008290080A (en) * | 2007-05-22 | 2008-12-04 | Sumitomo Metal Ind Ltd | Laser welding method and equipment for steel plate |
| US8070907B2 (en) | 2002-11-07 | 2011-12-06 | Nhk Spring Co., Ltd. | Jointing method for obtaining a joint structure formed of a plurality of parts |
| US8872446B2 (en) | 2010-02-17 | 2014-10-28 | Mitsubishi Heavy Industries, Ltd. | Welding method and superconducting accelerator |
| WO2016103385A1 (en) * | 2014-12-25 | 2016-06-30 | 地方独立行政法人大阪府立産業技術総合研究所 | Method for producing surface-modified base |
| DE102019212923A1 (en) * | 2019-08-28 | 2021-03-04 | Thyssenkrupp Steel Europe Ag | Process for the material connection of workpieces as well as workpieces that are materially connected to one another in the butt joint |
-
1992
- 1992-03-10 JP JP4051824A patent/JP2713000B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8070907B2 (en) | 2002-11-07 | 2011-12-06 | Nhk Spring Co., Ltd. | Jointing method for obtaining a joint structure formed of a plurality of parts |
| DE10315976A1 (en) * | 2003-04-08 | 2004-10-21 | Volkswagen Ag | To prepare coated metal sheets for soldering/welding, for vehicle bodywork parts, the surface coating is removed by a laser beam at the joint surface zones |
| JP2008290080A (en) * | 2007-05-22 | 2008-12-04 | Sumitomo Metal Ind Ltd | Laser welding method and equipment for steel plate |
| US8872446B2 (en) | 2010-02-17 | 2014-10-28 | Mitsubishi Heavy Industries, Ltd. | Welding method and superconducting accelerator |
| WO2016103385A1 (en) * | 2014-12-25 | 2016-06-30 | 地方独立行政法人大阪府立産業技術総合研究所 | Method for producing surface-modified base |
| JPWO2016103385A1 (en) * | 2014-12-25 | 2017-07-06 | 地方独立行政法人大阪府立産業技術総合研究所 | Method for producing surface modified substrate |
| DE102019212923A1 (en) * | 2019-08-28 | 2021-03-04 | Thyssenkrupp Steel Europe Ag | Process for the material connection of workpieces as well as workpieces that are materially connected to one another in the butt joint |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2713000B2 (en) | 1998-02-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |