JPH0441089A - Method for welding precoated steel plate - Google Patents
Method for welding precoated steel plateInfo
- Publication number
- JPH0441089A JPH0441089A JP2146696A JP14669690A JPH0441089A JP H0441089 A JPH0441089 A JP H0441089A JP 2146696 A JP2146696 A JP 2146696A JP 14669690 A JP14669690 A JP 14669690A JP H0441089 A JPH0441089 A JP H0441089A
- Authority
- JP
- Japan
- Prior art keywords
- steel plate
- welded
- welding
- coated
- laser beam
- 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.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 47
- 239000010959 steel Substances 0.000 title claims abstract description 47
- 238000003466 welding Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims description 19
- 239000002184 metal Substances 0.000 claims abstract description 11
- 229920006254 polymer film Polymers 0.000 claims abstract description 10
- 230000001678 irradiating effect Effects 0.000 claims abstract 2
- 238000005452 bending Methods 0.000 claims 1
- 239000011248 coating agent Substances 0.000 abstract description 18
- 238000000576 coating method Methods 0.000 abstract description 18
- 238000005304 joining Methods 0.000 abstract description 6
- 230000003685 thermal hair damage Effects 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- NFGXHKASABOEEW-UHFFFAOYSA-N 1-methylethyl 11-methoxy-3,7,11-trimethyl-2,4-dodecadienoate Chemical compound COC(C)(C)CCCC(C)CC=CC(C)=CC(=O)OC(C)C NFGXHKASABOEEW-UHFFFAOYSA-N 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/006—Vehicles
-
- 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
Landscapes
- Laser Beam Processing (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、自動車、家電製品等に使用されるプレコート
鋼板の溶接方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for welding prepainted steel sheets used in automobiles, home appliances, etc.
[従来の技術]
表面に高分子膜を有するプレコート鋼板は、脱脂、化成
、塗装といった繁雑な処理工程を省略できること、表面
平滑性に優れること、塗膜物性に優れ、プレス加工も可
能であることなどから、家電製品における外装鋼板等と
して近年需要量が増大している。[Prior art] Pre-coated steel sheets with a polymer film on the surface can omit complicated processing steps such as degreasing, chemical conversion, and painting, have excellent surface smoothness, have excellent coating film properties, and can be press-formed. For these reasons, demand has increased in recent years for use as exterior steel sheets in home appliances.
而して、このプレコート鋼板は、表面のコーティング膜
が絶縁性であることから、通常の薄鋼板の接合に使用さ
れるスポットi接で:;!接合が不可能である。そのた
め、スポットl容接や、その他の電気抵抗溶接を適用し
ようとする場合には、被溶接箇所におけるコーティング
膜を除去したり、相手側の鋼板に突起を形成することが
必要になる。Since the coating film on the surface of this pre-coated steel sheet is insulating, it can be used for spot i-contact, which is normally used for joining thin steel sheets. Bonding is not possible. Therefore, when applying spot I welding or other electric resistance welding, it is necessary to remove the coating film at the welded location or to form protrusions on the mating steel plate.
電気抵抗溶接以外では、機械的嵌合、接着等が行われる
場合もある。In addition to electric resistance welding, mechanical fitting, adhesion, etc. may also be used.
しかるに、スポット溶接等の電気抵抗溶接では、コーテ
ィング膜の除去等に余分な手数がかかるだけでなく、入
熱量が大きいために、溶接部の周囲が熱影響を受けるこ
とにより、コーティング膜が熱損傷し、製品の外観が著
しく損なわれる。熱損傷部を見えなくしようとする場合
には、折り返し行わなければならず、工数の更なる増大
やデザインの制限を招く。However, with electric resistance welding such as spot welding, not only does it take extra time to remove the coating film, but also the amount of heat input is large, so the surrounding area of the weld is affected by heat, which can cause thermal damage to the coating film. However, the appearance of the product will be significantly impaired. If it is desired to make the thermally damaged part invisible, it must be folded back, which further increases the number of man-hours and limits the design.
また、機械的嵌合や接着等では、溶接はどの接合強度は
得られない。In addition, mechanical fitting, adhesion, etc. cannot provide any joint strength with welding.
本発明の目的は、プレコート鋼板が簡単に、しかも外観
を損なうことなく、高強度に接合される溶接方法を提供
することにある。An object of the present invention is to provide a welding method by which prepainted steel plates can be easily joined with high strength without impairing the appearance.
〔課題を解決するための手段]
ところで、薄鋼板の溶接分野では、近年、レーザービー
ムや電子ビームの適用気運が高まっている。レーザービ
ーム溶接によると、周囲への熱影響が極めて少なく、プ
レコート鋼板に適用した場合には、熱伝導によるコーテ
ィング膜の昇温は高々数十度に抑えることができる。た
だし、抵抗溶接では、被溶接部を重ね合せて溶接するの
で、被溶接部が外部に露出されないが、レーザービーム
溶接では、被溶接部に直接レーザービームを照射するた
め、被溶接部が外部に露出していなければならない。ま
た、レーザービームがコーティング面に直接照射された
場合には、コーティング物質が燃焼、ガス化し、健全な
溶接部が得られない。[Means for Solving the Problems] Incidentally, in the field of welding thin steel plates, there has been an increasing trend in recent years to apply laser beams and electron beams. Laser beam welding has extremely little thermal effect on the surrounding area, and when applied to pre-coated steel sheets, the temperature rise of the coating film due to heat conduction can be suppressed to several tens of degrees at most. However, in resistance welding, the parts to be welded are overlapped and welded, so the part to be welded is not exposed to the outside, but in laser beam welding, the part to be welded is directly irradiated with a laser beam, so the part to be welded is exposed to the outside. Must be exposed. Furthermore, if the laser beam is directly irradiated onto the coating surface, the coating material will burn and gasify, making it impossible to obtain a sound weld.
プレコート鋼板のレーザービーム溶接では、この2つの
問題が解決されない限りは、実用的な溶接法は望めない
。In laser beam welding of pre-coated steel sheets, a practical welding method cannot be expected unless these two problems are solved.
薄鋼板の溶接におけるレーザービーム照射法については
、例えば重ね合わせたストリップをロールで連続圧下す
る際に、ロール入側でストリップをV状に開き、その内
奥部にレーザービームを照射することにより、ストリッ
プを貫通溶融させることなく連続溶接する方法が開発さ
れている(Proceedings of LAMP
’87.0saka(May、1987) E。Regarding the laser beam irradiation method for welding thin steel plates, for example, when stacked strips are continuously rolled down with rolls, the strips are opened in a V shape on the entrance side of the rolls, and the laser beam is irradiated deep inside the strips. A method has been developed for continuous welding of strips without penetration melting (Proceedings of LAMP).
'87.0saka (May, 1987) E.
この方法を片面プレコート鋼板に適用すれば、被溶接部
へのビーム照射と、コーティング膜の熱損傷防止とが可
能になる。しかしながら、前記方法はストリップどうし
の接合にしか適用できないため、プレコート鋼板が主に
用いられて家電製品の外装組立には適用することができ
ない。家電製品の外装組立では、予め成形加工された部
材をスボ7)溶接の如く簡便かつ自在に溶接できなけれ
ばならない。If this method is applied to a single-sided pre-coated steel plate, it becomes possible to irradiate the welded part with the beam and prevent thermal damage to the coating film. However, since the method is only applicable to joining strips together, pre-painted steel sheets are mainly used and cannot be applied to the exterior assembly of home appliances. When assembling the exterior of a home appliance, it is necessary to weld pre-formed members easily and freely, such as through-hole welding.
本発明は、片面プレコート鋼板の被溶接部近傍を予め僅
かに加工しておくことにより、被溶接部に直接レーザー
ビームが照射できると共に、コーティング膜へのビーム
照射が防止でき、さらに、スポット溶接部みの機動性を
もって溶接ができるようにしたものである。In the present invention, by slightly processing the vicinity of the part to be welded of a single-sided pre-coated steel plate, the part to be welded can be directly irradiated with a laser beam, and the coating film can be prevented from being irradiated with the laser beam. This allows for welding with minimal mobility.
すなわち、本発明の溶接方法は、片面が絶縁性高分子膜
にてコーティングされた片面プレコート鋼板の非コーテ
ィング面を金属面に溶接するプレコート鋼板の溶接方法
であって、片面プレコート鋼板の非コーティング面にお
ける被溶接箇所と金属面における被溶接箇所とを密着さ
せると共に、その密着部分に接した部分で非コーティン
グ面が外側になるようプレコート鋼板を略U状に折り曲
げて■状開先を形成し、該開先の内奥部に位置する密着
部分に向けてレーザービームを照射することを特徴とし
てなる。That is, the welding method of the present invention is a welding method for a pre-coated steel plate, in which the non-coated surface of a single-sided pre-coated steel plate coated with an insulating polymer film on one side is welded to a metal surface, and the welding method comprises: The part to be welded on the metal surface is brought into close contact with the part to be welded on the metal surface, and the pre-coated steel plate is bent into a substantially U-shape so that the non-coated surface is on the outside in the part that is in contact with the part that is in contact with the part to form a ■-shaped groove, The feature is that the laser beam is irradiated toward the close contact portion located deep inside the groove.
第1図は本発明の溶接方法の一実施!j!4様を示す模
式図で、薄鋼板lにプレコート綱板2を溶接する場合に
ついて示している。Figure 1 shows one implementation of the welding method of the present invention! j! This is a schematic diagram showing four types, and shows a case where a pre-coated steel plate 2 is welded to a thin steel plate l.
プレコート鋼板2は、その片面に絶縁性の高分子膜3が
被覆され、高分子膜3が被覆されていない非コーティン
グ面4が外側になるようにして、被溶接箇所より端部側
を反端部側へU状に折り曲げた状態にされている。この
ような状態で、上記被溶接箇所を綱板lの金属面5にお
ける被溶接箇所に密着させて■状開先を形成し、その開
先の先奥部に位置する密着部に向けて開先入側よりレー
ザービーム6を照射する。The pre-coated steel plate 2 is coated with an insulating polymer film 3 on one side, with the non-coated surface 4 not covered with the polymer film 3 facing outward, and the end side opposite to the welding area. It is bent in a U-shape toward the side. In this state, a ■-shaped groove is formed by bringing the welded area into close contact with the welded area on the metal surface 5 of the steel plate l, and the groove is opened toward the close contact area located at the deep end of the groove. A laser beam 6 is irradiated from the entry side.
このとき、プレコート鋼板2の折り曲げ部にレーザービ
ーム6が当たる事態は避ける必要がある(第2図参照)
。そのために必要があれば、例えばレーザービーム軸に
対して被溶接材料を傾斜させたり、光ファイバーを使用
する。At this time, it is necessary to avoid the situation where the laser beam 6 hits the bent part of the pre-painted steel plate 2 (see Figure 2).
. For this purpose, if necessary, for example, the material to be welded may be tilted relative to the laser beam axis, or an optical fiber may be used.
プレコート鋼板2の端部が非コーティング面を外側にし
て折り曲げられているので、金属露出面が相互に密着し
、かつその密着部分にレーザービーム6が到達して該密
着部分が溶融される。これにより、高分子膜3の除去な
しに、被溶接箇所がスポット溶接的に接合される共に、
被溶接箇所近傍の高分子膜3に熱損傷が生しる事態が避
けられる。更に、万一溶接熱で高分子膜3が損傷しても
、その損傷部がプレコートE板2の折り曲げ部で覆われ
ているので、外観が損なわれるおそれもない。Since the ends of the pre-coated steel plate 2 are bent with the non-coated surface facing outward, the metal exposed surfaces are in close contact with each other, and the laser beam 6 reaches the close contact portion and melts the close contact portion. As a result, the parts to be welded can be joined by spot welding without removing the polymer film 3, and
It is possible to avoid thermal damage to the polymer film 3 in the vicinity of the welded area. Furthermore, even if the polymer film 3 is damaged by welding heat, the damaged part is covered by the bent part of the pre-coated E plate 2, so there is no risk that the appearance will be impaired.
更に叉、密着面に対して平行状にレーザービームが照射
されるので、貫通溶接に至ることもない。Furthermore, since the laser beam is irradiated parallel to the contact surface, penetration welding will not occur.
なお、本発明の溶接方法はプレコート綱板どおしの接合
にも全く同様に適用することができる。Note that the welding method of the present invention can be applied in exactly the same way to joining pre-coated steel sheets.
以下に本発明の実施例を第3図および第4図を参照して
説明する。Embodiments of the present invention will be described below with reference to FIGS. 3 and 4.
JIS 5PCD鋼板の片面にポリエステル系塗料を
コートした板厚0.6閣で円板状のプレコート鋼板2の
中心部に丸孔をあけ、非コーティング面4を内側にして
丸孔の周縁部を全周にわたって外側へ折り曲げた。そし
て、JIS G3193の熱延綱板よりなる厚みが2
閣の円板状で、その中心部にプレコート鋼板2の丸孔よ
り小さい丸孔を有する薄鋼板lに、プレコート鋼板2を
同心状に重ね、プレコート鋼板2における折り曲げ部近
傍を全周にわたって薄鋼板lの金属面5に密着させた状
態で、その密着部に約45°の方向からレーザービーム
を照射した。Drill a round hole in the center of a disc-shaped pre-coated steel plate 2 made of JIS 5PCD steel plate coated with polyester paint on one side and coated with polyester paint on one side. It was folded outward around the circumference. The thickness of JIS G3193 hot-rolled steel sheet is 2.
The pre-painted steel plate 2 is stacked concentrically on a thin steel plate 1 which has a disc-like shape and has a round hole smaller than the round hole of the pre-painted steel plate 2 in the center, and the thin steel plate 1 is placed around the entire circumference near the bent part of the pre-painted steel plate 2. While in close contact with the metal surface 5 of 1, the adhered portion was irradiated with a laser beam from a direction of approximately 45°.
レーザービームの照射は、高速軸流型1.kw炭酸ガス
レーザ発振器と、焦点距離126mmのGaAs製レン
ズを用い、出力500Wで1秒間の照射とした。Laser beam irradiation is performed using a high-speed axial flow type 1. Irradiation was performed for 1 second at an output of 500 W using a kW carbon dioxide laser oscillator and a GaAs lens with a focal length of 126 mm.
ワークを回転させて周方向に16箇所を溶接したところ
、コーティング膜の変色は全く認めみれなかった。また
、接合後にプレコート綱板2および薄鋼板lをそれぞれ
接着剤で丸棒に接合し、インストロン型引張試験機で引
き剥がし強度を測定したところ、120kgfと十分な
接合強度を有することが確認できた。When the workpiece was rotated and welded at 16 locations in the circumferential direction, no discoloration of the coating film was observed. In addition, after joining, the pre-coated steel sheet 2 and the thin steel sheet 1 were each joined to a round bar with adhesive, and the peel strength was measured using an Instron type tensile tester, and it was confirmed that the joint had a sufficient joint strength of 120 kgf. Ta.
比較のために、同じ材料を用いて直上からレーザービー
ムを照射したものでは、第2図に示すように、密着した
被溶接箇所までレーザービームが屈かず、また、引き剥
がし強度は3kgfと極端に小さかった。For comparison, when the same material was irradiated with a laser beam from directly above, as shown in Figure 2, the laser beam did not bend to the welded parts that were in close contact with each other, and the peeling strength was extremely high at 3 kgf. It was small.
また、同し材料をプロジェクション溶接で接合したとこ
ろ、引き剥がし試験では母材破断を生したが、コーティ
ング膜の焼けにより外観が著しく損なわれた。Furthermore, when the same material was joined by projection welding, the base material fractured in a peel test, but the appearance was significantly damaged due to burning of the coating film.
[発明の効果]
以上の説明から明らかなように、本発明の溶接方法は、
プレコート鋼板を高強度で接合できる。[Effects of the Invention] As is clear from the above explanation, the welding method of the present invention has the following effects:
Can join pre-painted steel plates with high strength.
しかも、その接合にあっては、コーティング膜を除去す
る必要がなく、溶接部近傍のコーティング膜に熱損傷が
生しるおそれもない。更に、その溶接においては、スボ
7)溶接部みの機動性が発揮される。従って、家電製品
の外装組立に適用した場合にも、工程数が少なく、優れ
た組立強度が得られ、外観を損なうおそれもない。Moreover, in the joining process, there is no need to remove the coating film, and there is no risk of thermal damage to the coating film in the vicinity of the welded portion. Furthermore, in the welding, the mobility of the welded part (7) is exhibited. Therefore, even when applied to the exterior assembly of home appliances, the number of steps is small, excellent assembly strength can be obtained, and there is no risk of deteriorating the appearance.
第1図は本発明法の一実施態様を示す模式図、第2図は
ビーム照射に問題がある場合の模式図、第3図および第
4図は本発明法の実施例に用いられたワークの平面図お
よび断面図である。
l:薄鋼板、2:プレコー)fl板、3:高分子膜、4
:非コーティング面、5:金属面、6:レーザービーム
。
出 願 人 住友金属工業株式会社
第
図
第
図Fig. 1 is a schematic diagram showing one embodiment of the method of the present invention, Fig. 2 is a schematic diagram when there is a problem with beam irradiation, and Figs. 3 and 4 are workpieces used in the embodiment of the method of the present invention. FIG. l: Thin steel plate, 2: Precor) fl plate, 3: Polymer film, 4
: non-coated surface, 5: metal surface, 6: laser beam. Applicant: Sumitomo Metal Industries, Ltd.
Claims (1)
面プレコート鋼板の非コーティング面を金属面に溶接す
るプレコート鋼板の溶接方法であって、片面プレコート
鋼板の非コーティング面における被溶接箇所と金属面に
おける被溶接箇所とを密着させると共に、その密着部分
に接した部分で非コーティング面が外側になるようプレ
コート鋼板を略U状に折り曲げてV状開先を形成し、該
開先の内奥部に位置する密着部分に向けてレーザービー
ムを照射することを特徴とするプレコート鋼板の溶接方
法。(1) A welding method for a pre-coated steel plate, in which the non-coated surface of a single-sided pre-coated steel plate coated with an insulating polymer film is welded to a metal surface, the welding point being welded on the non-coated surface of the single-sided pre-coated steel plate and the metal The pre-coated steel plate is brought into close contact with the area to be welded on the surface, and a V-shaped groove is formed by bending the pre-coated steel plate in a substantially U-shape so that the non-coated surface in contact with the adhered area is on the outside. A method for welding pre-painted steel plates, which is characterized by irradiating a laser beam to the closely-attached parts located at the parts.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2146696A JPH0441089A (en) | 1990-06-04 | 1990-06-04 | Method for welding precoated steel plate |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2146696A JPH0441089A (en) | 1990-06-04 | 1990-06-04 | Method for welding precoated steel plate |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0441089A true JPH0441089A (en) | 1992-02-12 |
Family
ID=15413492
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2146696A Pending JPH0441089A (en) | 1990-06-04 | 1990-06-04 | Method for welding precoated steel plate |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0441089A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10261562A1 (en) * | 2002-12-23 | 2004-07-01 | Volkswagen Ag | Laser welding process comprises placing a sheet component partially on a further sheet component, and fixing so that a degassing gap for the laser welding seam for connecting the components is formed in the region of the crack |
EP0771605B1 (en) * | 1995-11-04 | 2005-11-16 | Volkswagen Aktiengesellschaft | Laser welding process for coated metal sheets |
-
1990
- 1990-06-04 JP JP2146696A patent/JPH0441089A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0771605B1 (en) * | 1995-11-04 | 2005-11-16 | Volkswagen Aktiengesellschaft | Laser welding process for coated metal sheets |
DE10261562A1 (en) * | 2002-12-23 | 2004-07-01 | Volkswagen Ag | Laser welding process comprises placing a sheet component partially on a further sheet component, and fixing so that a degassing gap for the laser welding seam for connecting the components is formed in the region of the crack |
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