JP3115456B2 - Laser welding method for galvanized steel sheet - Google Patents
Laser welding method for galvanized steel sheetInfo
- Publication number
- JP3115456B2 JP3115456B2 JP05195247A JP19524793A JP3115456B2 JP 3115456 B2 JP3115456 B2 JP 3115456B2 JP 05195247 A JP05195247 A JP 05195247A JP 19524793 A JP19524793 A JP 19524793A JP 3115456 B2 JP3115456 B2 JP 3115456B2
- Authority
- JP
- Japan
- Prior art keywords
- galvanized steel
- steel sheet
- laser
- gap
- welding
- 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.)
- Expired - Fee Related
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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
Description
【０００１】[0001]
【産業上の利用分野】本発明は亜鉛めっき鋼板をレーザ
を用いて重ね溶接（以後、重ねレーザ溶接あるいはレー
ザ重ね溶接という）する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of lap welding galvanized steel sheets using a laser (hereinafter referred to as lap laser welding or laser lap welding).
【０００２】[0002]
【従来の技術】亜鉛めっき鋼板２枚を重ねレーザ溶接す
ると、鋼板間に急速に発生する亜鉛蒸気が溶融金属を吹
き飛ばすためにスパッタが激しく発生し、また溶接ビー
ドにピット、ブローホールを多発して溶接ビードの良好
な外観および機械的強度を確保できないことは古くより
知られている。また、亜鉛めっき鋼板間に適当な隙間を
形成することにより、良好な重ね溶接を行えることも良
く知られているところであり、隙間を形成する方法とし
てさまざまなものが知られている。たとえば、特開昭６
１−２７１８９号公報によれば、亜鉛めっき鋼板間に適
当な間隔の空隙を形成できるように、予め塑性加工を施
すとしている。このような手法は重ねレーザ溶接に限っ
たことではなく、特開昭６２−１７９８６９号公報に見
られるようにアーク溶接においても有効である。この発
明によれば、溶接すべき各母材の少なくとも一方に凸部
を設け溶接部周囲に隙間を形成し、アーク溶接を行うと
している。2. Description of the Related Art When two galvanized steel sheets are overlapped and laser-welded, spatter is generated intensely because zinc vapor rapidly generated between the steel sheets blows away molten metal, and pits and blow holes frequently occur in a weld bead. It has long been known that good appearance and mechanical strength of a weld bead cannot be ensured. It is also well known that good lap welding can be performed by forming an appropriate gap between galvanized steel sheets, and various methods for forming a gap are known. For example, JP
According to Japanese Patent Application Laid-Open No. 1-27189, plastic working is performed in advance so that voids at appropriate intervals can be formed between galvanized steel sheets. Such a technique is not limited to lap laser welding, but is also effective in arc welding as disclosed in Japanese Patent Application Laid-Open No. Sho 62-179869. According to the present invention, a projection is provided on at least one of the base materials to be welded, a gap is formed around the welded portion, and arc welding is performed.
【０００３】上記のように亜鉛めっき鋼板間に予め隙間
を設ける方法以外に、亜鉛めっき鋼板間に第３の部材を
挿入し、隙間を形成する方法も開示されている。たとえ
ば、特開平４−２７９２９１号公報では鋼板間に紙を挟
み込む溶接方法、また特開平４−２８８９８６号公報で
は鋼板間に可燃性多孔質材からなる薄いシートを挟み込
んで溶接を行う方法が開示されている。In addition to the method of providing a gap between galvanized steel sheets in advance as described above, a method of forming a gap by inserting a third member between galvanized steel sheets is also disclosed. For example, Japanese Patent Application Laid-Open No. 4-279291 discloses a welding method in which paper is inserted between steel sheets, and Japanese Patent Application Laid-Open No. 4-288896 discloses a method in which a thin sheet made of a combustible porous material is inserted between steel sheets and welding is performed. ing.
【０００４】この他、亜鉛めっき鋼板間に隙間を設ける
方法以外に、溶接前に被溶接部の亜鉛を除去する方法も
開示されている。たとえば、特開平４−２３１１９０号
公報による方法では、レーザ光をエネルギー密度の高い
集光レーザ光と低い集光レーザ光の２つに分離し、エネ
ルギー密度の低いレーザ光により被溶接部の亜鉛を蒸発
・離散させ、エネルギー密度の高いレーザ光により溶融
・溶接するとしている。また、特開平４−２５１６８４
号公報に開示されている方法では、レーザ光の出力を制
御してピークの低いパルスのレーザ光と高いレーザ光の
２つを交互に照射し、ピークの低いレーザ光で亜鉛めっ
きを除去し、高いレーザ光で溶接を行うとしている。[0004] In addition to the method of providing a gap between galvanized steel sheets, a method of removing zinc from a portion to be welded before welding is disclosed. For example, in the method disclosed in Japanese Patent Application Laid-Open No. 4-231190, a laser beam is separated into two laser beams, one with a high energy density and the other with a low energy density. It is said to be vaporized and separated, and melted and welded by laser light with a high energy density. Further, Japanese Patent Application Laid-Open No. 4-251684
In the method disclosed in Japanese Patent Application Publication No. H10-216, the laser beam output is controlled to alternately irradiate two of a low peak pulse laser beam and a high laser beam, and the zinc plating is removed by the low peak laser beam. It is said that welding is performed with high laser light.
【０００５】[0005]
【発明が解決しようとする課題】以上記した従来の方法
には、それぞれに問題点があった。すなわち、特開昭６
１−２７１８９号公報、特開昭６２−１７９８６９号公
報に示されているように被溶接材に予めプレス加工など
を施して、亜鉛めっき鋼板間に隙間を設ける方法では、
溶接前の加工工程が１つ増えてしまう。また、亜鉛めっ
き鋼板間に紙、多孔質材などを挿入する特開平４−２７
９２９１号公報、特開平４−２８８９８６号公報にそれ
ぞれ開示されている方法では、鋼板間に挟み込んだ第３
の部材が保水材となって、亜鉛めっきが損傷を受けた溶
接部近傍の腐食が加速されてしまう。また、レーザ光を
用いて被溶接部の亜鉛を除去しようとする特開平４−２
３１１９０号公報、特開平４−２５１６８４号公報に開
示された方法では、スパッタやブローホールの原因とな
る、重ねられた鋼板の内面の亜鉛めっきの除去が十分に
は行われず、完全にはスパッタやブローホールの発生を
抑制することができなかった。Each of the above-mentioned conventional methods has its own problems. That is,
In the method disclosed in Japanese Unexamined Patent Application Publication No. 1-227189 and Japanese Unexamined Patent Application Publication No. Sho 62-179869, a material to be welded is subjected to press working in advance to provide a gap between galvanized steel sheets.
The number of processing steps before welding increases by one. In addition, Japanese Patent Application Laid-Open No. 4-27 inserts paper, porous material, etc. between galvanized steel sheets.
According to the methods disclosed in Japanese Patent No. 9291 and Japanese Patent Laid-Open No. 4-288896, respectively, a third steel sheet sandwiched between steel plates is used.
The member becomes a water retention material, and the corrosion near the welded portion where the galvanization is damaged is accelerated. In addition, Japanese Patent Application Laid-Open No. 4-2 discloses an attempt to remove zinc from a welded portion using a laser beam.
In the method disclosed in Japanese Patent Application Laid-Open No. 31190 and Japanese Patent Application Laid-Open No. Hei 4-251684, the removal of zinc plating on the inner surface of the stacked steel sheets, which causes spatter and blowholes, is not performed sufficiently, and the spatter The generation of blow holes could not be suppressed.
【０００６】本発明は、亜鉛めっきの重ねレーザ溶接に
おいてスパッタやブローホールの発生を防止するために
なされたものであり、上記のような従来技術の問題を解
決して健全な溶接部を簡便に形成することを目的とす
る。SUMMARY OF THE INVENTION The present invention has been made to prevent the occurrence of spatters and blowholes in lap laser welding of zinc plating. The purpose is to form.
【０００７】[0007]
【課題を解決するための手段】本発明は前記課題を解決
するものであって、レーザを用いた亜鉛めっき鋼板の重
ね溶接において、レーザ照射側にある前記亜鉛めっき鋼
板の端部は拘束せずに前記亜鉛めっき鋼板を支持し、レ
ーザ照射側の前記亜鉛めっき鋼板のみを重ね溶接部の中
心位置より拘束側へ１〜１５ｍｍ離れた位置において予
めレーザを用いて溶融させて端部を変形させることによ
り前記亜鉛めっき鋼板の間に隙間を形成し、その後前記
亜鉛めっき鋼板を重ね溶接することを特徴とする亜鉛め
っき鋼板のレーザ溶接方法である。またここにおいて、
前記亜鉛めっき鋼板の切断面を溶融させないこと、亜鉛
めっき鋼板の前記隙間Ｇ（μｍ）は、鋼板（１、２）の
重ね合わされた面にある目付け量の合計をＸ（ｇｒ／ｍ
2 ）として、Ｇ＝２５／１２０×Ｘ以上であり、かつ鋼
板（１、２）の薄い方の板厚の５０％以下であることも
特徴とする。なお、ここで端部とは切断面より２０ｍｍ
以内の領域と定義する。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In lap welding of a galvanized steel sheet using a laser, the end of the galvanized steel sheet on the laser irradiation side is not restricted. the galvanized steel sheet to a support, in the only lap weld said zinc plated steel sheet of the laser irradiation side
To form a gap, welding superimposed then the galvanized steel sheet between the galvanized steel sheet by by melting using pre-laser at a position away 1~15mm to restraining side sincerely position deforming the end portion A laser welding method for a galvanized steel sheet. Also here
Do not melt the cut surface of the galvanized steel sheet, zinc
The gap G (μm) of the plated steel sheet is the same as that of the steel sheet (1, 2).
The sum of the basis weights on the superposed surfaces is represented by X (gr / m
2 ) As G = 25/120 × X or more and steel
It is also characterized in that it is 50% or less of the thinner plate thickness of the plates (1, 2) . In this case, the end is 20 mm from the cut surface.
Defined as the area within.
【０００８】[0008]
【作用】図１は本発明を用いて亜鉛めっき鋼板を重ねレ
ーザ溶接した場合の溶接部の断面図である。図１中１、
２は亜鉛めっき鋼板であり、これらは拘束具３ａ、３ｂ
および４ａ、４ｂにより重ね合わされている。図１では
レーザ光源と反対側の亜鉛めっき鋼板２の端部は拘束具
３ａ、３ｂにより拘束されていないが、図２に示すよう
に亜鉛めっき鋼板２の端部を拘束具３ａ、３ｂにより拘
束する場合においても同様の効果が得られる。FIG. 1 is a sectional view of a welded portion when a galvanized steel sheet is overlapped and laser welded using the present invention. 1 in FIG.
Numeral 2 denotes galvanized steel sheets, which are restrainers 3a, 3b
And 4a, 4b. In FIG. 1, the end of the galvanized steel sheet 2 on the side opposite to the laser light source is not restrained by the restraints 3a, 3b, but as shown in FIG. 2, the end of the galvanized steel sheet 2 is restrained by the restraints 3a, 3b. In this case, the same effect can be obtained.
【０００９】上記のような拘束を行った状態で、予め重
ね溶接位置よりも拘束側位置においてレーザにより亜鉛
めっき鋼板１のみを溶融させて溶融部７を形成し、熱収
縮により端部５をレーザ照射トーチ６による照射側に変
形させた後、その後重ね溶接ビード８を形成する。この
場合において、溶融部７は鋼板１を貫通しないように形
成する。したがって、この溶融部はピット、ブローホー
ルなどの欠陥なく形成することができる。In a state where the above-described restraint is performed, only the galvanized steel sheet 1 is melted by a laser at a position on the restraint side of the lap welding position in advance to form a fused portion 7, and the end portion 5 is thermally shrunk to form the molten portion 7. After being deformed to the irradiation side by the irradiation torch 6, a lap welding bead 8 is formed thereafter. In this case, the fusion part 7 is formed so as not to penetrate the steel plate 1. Therefore, this fused portion can be formed without defects such as pits and blow holes.
【００１０】ところで、レーザを鋼板に照射するとレー
ザの照射される側は溶接金属幅が広く、反対側は溶接金
属幅が狭い溶融部が形成される。このとき、溶融金属の
凝固、冷却過程で溶融金属に体積収縮が生じるが、上記
のような溶融部の構造からレーザ照射側の収縮が大き
く、反対側の収縮が少なくなる。したがって、鋼板１は
溶融部のビードを中心にレーザ照射側に角変形を起こす
が、鋼板１は拘束具３ａ、３ｂに拘束されているため、
拘束されていない端部５側に変形が集中し、結果的に隙
間９が形成される。By the way, when a steel sheet is irradiated with a laser, a welded metal is formed with a wide weld metal width on the side irradiated with the laser and a narrow weld metal width on the opposite side. At this time, volumetric shrinkage occurs in the molten metal during the solidification and cooling processes of the molten metal. However, due to the structure of the molten portion as described above, the shrinkage on the laser irradiation side is large and the shrinkage on the opposite side is small. Therefore, although the steel plate 1 undergoes angular deformation on the laser irradiation side around the bead of the fusion part, since the steel plate 1 is restrained by the restraints 3a and 3b,
The deformation concentrates on the side of the end 5 that is not restrained, and as a result, the gap 9 is formed.
【００１１】隙間９が形成された後、溶接ビード８を形
成するが、隙間９が形成されているため鋼板１、２間で
発生した亜鉛蒸気は隙間９に逃げ、溶接ビード８はピッ
ト、ブローホールなど溶接欠陥の発生なく形成すること
ができる。After the gap 9 is formed, the weld bead 8 is formed. Since the gap 9 is formed, the zinc vapor generated between the steel plates 1 and 2 escapes to the gap 9 and the weld bead 8 is formed by pits and blows. It can be formed without occurrence of welding defects such as holes.
【００１２】溶融部７はレーザ照射側の溶融幅を広くす
るほど、また反対側の溶融幅を狭くするほど隙間９を広
くすることができるので有利である。ところで亜鉛めっ
き鋼板にレーザを照射すると、鋼板表面の亜鉛が蒸発
し、溶接プラズマを大きく成長させる方向に働くため、
レーザ照射側の溶融幅を広くするには有利である。溶融
部７を形成するためのレーザ照射条件には特に制限はな
く、焦点をずらす、またはレーザ照射出力を抑制するな
どの方法を適宜選択することができる。また、本発明は
レーザの種類にはよらず、効果を期待できる。The gap 9 of the fusion zone 7 can be advantageously increased by increasing the fusion width on the laser irradiation side and by decreasing the fusion width on the opposite side. By the way, when irradiating a galvanized steel sheet with a laser, the zinc on the steel sheet surface evaporates and works in the direction of growing the welding plasma greatly,
This is advantageous for increasing the melting width on the laser irradiation side. There are no particular restrictions on the laser irradiation conditions for forming the fusion zone 7, and a method such as shifting the focus or suppressing the laser irradiation output can be appropriately selected. Further, the present invention can be expected to have an effect irrespective of the type of laser.
【００１３】溶融部７と溶接部８の間隔が狭すぎると、
溶融部７により角変形を起こさせても溶接位置において
隙間が形成されないので本発明の効果はなくなる。した
がって溶接部８の位置を決めたあと、溶融部７の位置
は、少なくとも溶融部７と溶接部８が重ならない位置を
選択することが必要である。通常、溶融部７の中心と溶
接部（溶接ビード８）の中心間を１ｍｍ〜１５ｍｍ程度
とすることにより適当な隙間９を形成することができ
る。１ｍｍ未満では上述のように溶接位置において隙間
９が形成されないという問題が生じる。一方鋼板には角
変形以外の熱変形も生じるため、１５ｍｍ超では角変形
以外の熱変形が加わって溶接部８では部分的に隙間９が
形成されない場所が生じるという問題がある。If the distance between the fusion zone 7 and the welding zone 8 is too small,
Even if the molten portion 7 causes angular deformation, no gap is formed at the welding position, so that the effect of the present invention is lost. Therefore, after the position of the welded portion 8 is determined, it is necessary to select at least a position where the welded portion 7 does not overlap with the welded portion 7 as the position of the welded portion 7. Usually, an appropriate gap 9 can be formed by setting the distance between the center of the fusion zone 7 and the center of the weld zone (weld bead 8) to about 1 mm to 15 mm. If it is less than 1 mm, there is a problem that the gap 9 is not formed at the welding position as described above. On the other hand, since thermal deformation other than angular deformation also occurs in the steel plate, if it exceeds 15 mm, thermal deformation other than angular deformation is applied, and there is a problem that a gap 9 is partially formed in the welded portion 8.
【００１４】重ね溶接を行って健全な溶接ビードを形成
するために必要な隙間９は、使用する鋼板の目付け量に
応じて変化する。最低必要な溶接ビード位置における間
隙Ｇ（μｍ）は、鋼板１および２の重ね合わされた面に
ある目付け量の合計をＸ（ｇｒ／ｍ2 ）として、Ｇ＝２
５／１２０×Ｘであらわされる。健全な溶接ビードを形
成するために必要な隙間９の溶接部における間隙の量は
広ければ広いほど良いわけではない。あまり広すぎると
溶接部９が凹形状になるばかりか、疲労強度の低い溶接
部となってしまう。このため、間隙Ｇは鋼板１あるいは
２の薄い方の板厚の５０％以下とすることが必要であ
る。The gap 9 necessary for forming a sound weld bead by performing lap welding varies depending on the basis weight of the steel plate used. The gap G (μm) at the minimum required weld bead position is G = 2, where X (gr / m 2 ) is the sum of the basis weights on the superposed surfaces of the steel plates 1 and 2.
5/120 × X. The larger the amount of gap at the weld of the gap 9 required to form a sound weld bead, the greater the better. If it is too wide, not only the welded portion 9 will have a concave shape but also a welded portion having low fatigue strength. Therefore, the gap G needs to be 50% or less of the smaller thickness of the steel plate 1 or 2.
【００１５】溶接部８の位置は、望ましくは鋼板１の切
断面を溶融させない位置を選択する。これは切断面を溶
融すると溶接ビードが乱れる傾向があるためで、外観良
好なことが特に強く望まれる用途では、鋼板１の切断面
を溶融させない溶接位置を選択することが必要である。The position of the weld 8 is desirably selected so that the cut surface of the steel plate 1 is not melted. This is because the weld bead tends to be disturbed when the cut surface is melted. Therefore, in applications where it is strongly desired that the appearance be good, it is necessary to select a welding position that does not melt the cut surface of the steel sheet 1.
【００１６】[0016]
【実施例】以下に本発明を実施例をあげて説明する。 ［実施例１］図３は本発明の実施例を示す溶接部の平面
図である。図３中１、２は板厚０．８ｍｍで片面当たり
目付け量６０ｇｒ／ｍ2 の両面めっきの合金化処理溶融
亜鉛めっき鋼板（ＧＡ６０／６０）である。これらは拘
束具３および４により図３のごとく拘束されている。The present invention will be described below with reference to examples. [Embodiment 1] FIG. 3 is a plan view of a welded portion showing an embodiment of the present invention. In FIG. 3, reference numerals 1 and 2 denote galvannealed steel sheets (GA60 / 60) having a plate thickness of 0.8 mm and having a basis weight of 60 gr / m 2 on one side, both sides being alloyed. These are restrained by restraints 3 and 4 as shown in FIG.
【００１７】この状態で熱源に炭酸ガスレーザを用い、
レーザ光を焦点距離１０インチのレンズを用いて鋼板上
３ｍｍに集光し、３ｋＷを照射し、４ｍ／ｍｉｎの走査
速度で鋼板１のエッジより５ｍｍ位置に溶融部７を形成
した。その後、本発明例１として５ｋＷ照射、４ｍ／ｍ
ｉｎ、焦点位置を鋼板直上として鋼板１のエッジより２
ｍｍの位置に溶接ビード８を形成し、鋼板１と２の溶接
を行った。In this state, using a carbon dioxide laser as a heat source,
Laser light was condensed on a steel plate at 3 mm using a lens with a focal length of 10 inches, irradiated with 3 kW, and a fused portion 7 was formed at a position 5 mm from the edge of the steel plate 1 at a scanning speed of 4 m / min. Then, as Example 1 of the present invention, 5 kW irradiation, 4 m / m
in, the focal position is just above the steel plate and 2 from the edge of the steel plate 1
A weld bead 8 was formed at a position of 1 mm and the steel plates 1 and 2 were welded.
【００１８】また、本発明例２として、溶融部７の形成
は本発明例１と同じ条件で実施した後、５ｋＷ照射、４
ｍ／ｍｉｎ、焦点位置を鋼板直上として鋼板１のエッジ
より０．５ｍｍの位置に溶接ビード８を形成し、鋼板１
と２の溶接を行った。この時、鋼板１の切断面も溶融し
ている。As Example 2 of the present invention, the formation of the fusion zone 7 was carried out under the same conditions as in Example 1 of the present invention, and then irradiated with 5 kW.
The weld bead 8 was formed at a position 0.5 mm from the edge of the steel sheet 1 with the focus position right above the steel sheet 1 m / min.
And 2 were welded. At this time, the cut surface of the steel plate 1 is also molten.
【００１９】ビード形状および内部の健全性を調査する
ために、目視による外観検査とＪＩＳ Ｚ３１０４に準
拠したＸ線透過試験を行った。すなわち、目視によって
ピットの発生状況を調べ、ピットがビード全長に対し、
５％以下の発生に留まったものを良好（○）、５％超２
０％以下をやや不良（△）、２０％超を不良（×）とし
て判定を行った。さらに、ピット発生がビード全長の５
％以内の留まっていても、外観形状のやや不良（△）、
不良（×）とを判定した。また、Ｘ線透過試験によって
ピットおよびブローホールの発生状況を調査し、ピット
およびブローホールがビードの全長に対し、５％以下の
発生に留まったものを良好（○）、５％超２０％以下を
やや不良（△）、２０％超を不良（×）として判定を行
った。In order to investigate the shape of the bead and the soundness inside, a visual appearance inspection and an X-ray transmission test according to JIS Z3104 were performed. That is, the occurrence of pits is visually inspected, and the pits
Good if less than 5% occurred (O), more than 5% 2
0% or less was judged as poor (△), and more than 20% was judged as bad (×). In addition, the occurrence of pits
%, The appearance is slightly poor (△),
Poor (x) was determined. In addition, the occurrence of pits and blowholes was investigated by X-ray transmission test. If the occurrence of pits and blowholes was less than 5% of the total length of the bead, it was good (○) and more than 5% and less than 20% Was judged as slightly defective (△) and more than 20% as defective (×).
【００２０】溶融部７を形成せずに、溶接ビード８のみ
を上記条件で、鋼板１のエッジより０．５ｍｍの位置と
２ｍｍ位置に形成した比較例とともに判定結果を表１に
示す。The results of the determination are shown in Table 1 together with comparative examples in which only the weld bead 8 was formed at the positions 0.5 mm and 2 mm from the edge of the steel sheet 1 under the above conditions without forming the fusion zone 7.
【００２１】[0021]
【表１】 [Table 1]
【００２２】［実施例２］図３においては溶融部７と溶
接ビード８は連続的であるが、その必要はない。図４も
図３と同様の溶接部の平面図であるが、溶融部７ａ、７
ｂ、７ｃ、・・・、溶接ビード８ａ、８ｂ、８ｃ、・・
・におけるように断続的にしても良い。この時、レーザ
照射を７ａ、８ａ、７ｂ、８ｂ、７ｃ、・・・の順に行
えば、溶融部と溶接ビードを順に形成していくことがで
きる。以下詳細に本実施例について説明を行う。[Embodiment 2] In FIG. 3, the fusion zone 7 and the weld bead 8 are continuous, but this is not necessary. FIG. 4 is a plan view of a welded portion similar to FIG.
b, 7c,..., welding beads 8a, 8b, 8c,.
It may be intermittent as in. At this time, if the laser irradiation is performed in the order of 7a, 8a, 7b, 8b, 7c,..., The molten portion and the weld bead can be formed in order. Hereinafter, this embodiment will be described in detail.
【００２３】図４中１、２は板厚０．７ｍｍで片面当た
り目付け量６０ｇｒ／ｍ2 の両面めっきの合金化処理溶
融亜鉛めっき鋼板（ＧＡ６０／６０）である。これらは
拘束具３および４により図４のごとく拘束されている。
本発明例３として、まず溶融部７ａを溶接速度４ｍ／ｍ
ｉｎで５ｍｍ長さ形成し、その後溶接ビード８ａを溶接
速度４ｍ／ｍｉｎで５ｍｍ長さ形成し、その後７ｂ、８
ｂ、７ｃ、８ｃ、・・・の順に繰り返しレーザ照射を行
った。この時、溶接ビード位置は鋼板端より２ｍｍ、溶
融部位置は鋼板端より４ｍｍであり、レーザ照射出力を
３ｋＷ一定として、焦点距離１０インチのレンズを用
い、溶融部では鋼板上１０ｍｍ位置に焦点をおき、溶接
部では鋼板上に焦点をおいてレーザ照射を行った。In FIG. 4, reference numerals 1 and 2 denote galvannealed steel sheets (GA60 / 60) having a thickness of 0.7 mm and having a basis weight of 60 gr / m 2 on one side, both sides being alloyed. These are restrained by restraints 3 and 4 as shown in FIG.
As Example 3 of the present invention, first, the fusion zone 7a was set to a welding speed of 4 m / m.
5 mm in length and then 5 mm long welding bead 8a at a welding speed of 4 m / min.
Laser irradiation was repeatedly performed in the order of b, 7c, 8c,. At this time, the welding bead position is 2 mm from the steel plate end, the fusion position is 4 mm from the steel plate end, the laser irradiation output is fixed at 3 kW, and a lens with a focal length of 10 inches is used. At the weld, laser irradiation was performed focusing on the steel plate.
【００２４】本発明例３と同じ条件で溶接ビード８ａ、
８ｂ、８ｃ、・・・のみを５ｍｍおきに、それぞれ５ｍ
ｍ長さ形成した比較例とともに、実施例１で記した判定
基準を用いて判定した結果を表２に示す。Under the same conditions as Example 3 of the present invention, the weld bead 8a,
8b, 8c,... Only every 5 mm, 5 m each
Table 2 shows the results of the determination using the criteria described in Example 1 together with the comparative example in which the m length was formed.
【００２５】[0025]
【表２】 [Table 2]
【００２６】［実施例３］また、溶融部と溶接ビードは
三角波あるいは図５の溶接部の平面図において１０のレ
ーザ照射軌跡に示すように正弦波状に連続的に形成する
こともできる。この場合、焦点位置ないしはレーザ照射
出力を変えることで拘束側では鋼板１のみを溶融させ、
端部側では鋼板１と２を重ね溶接を行う。以下、詳細に
本実施例について説明を行う。[Embodiment 3] Further, the welded portion and the weld bead can be formed continuously in a triangular wave or a sinusoidal shape as shown by a laser irradiation locus of 10 in the plan view of the welded portion in FIG. In this case, only the steel plate 1 is melted on the constraint side by changing the focal position or the laser irradiation output,
On the end side, the steel plates 1 and 2 are overlapped and welded. Hereinafter, the present embodiment will be described in detail.
【００２７】図５中１、２は板厚０．８ｍｍで片面当た
り目付け量６０ｇｒ／ｍ2 の両面めっきの合金化処理溶
融亜鉛めっき鋼板（ＧＡ６０／６０）である。これらは
拘束具３および４により図５のごとく拘束されている。
このような状態で、鋼板１のエッジより４ｍｍ位置を中
心に、図６の上段のグラフに示すような正弦波軌跡でレ
ーザ照射を行った。すなわち図６において、Ｘ軸は鋼板
１のエッジに沿った位置を表し、Ｙ軸の増加方向は鋼板
１の端部に向かう方向である。レーザ照射を行った正弦
波軌跡の振幅は２ｍｍであり、したがってレーザ照射軌
跡で最もエッジに接近したところで、軌跡とエッジの距
離は２ｍｍであり、最もエッジから離れたところの距離
で６ｍｍである。また、正弦波軌跡の周期は８ｍｍであ
る。In FIG. 5, reference numerals 1 and 2 denote galvanized steel sheets (GA60 / 60) having a thickness of 0.8 mm and having a basis weight of 60 gr / m 2 on one side, both sides being alloyed. These are restrained by restraints 3 and 4 as shown in FIG.
In such a state, laser irradiation was performed with a sinusoidal locus as shown in the upper graph of FIG. That is, in FIG. 6, the X axis represents a position along the edge of the steel sheet 1, and the increasing direction of the Y axis is a direction toward the end of the steel sheet 1. The amplitude of the sinusoidal trajectory subjected to laser irradiation is 2 mm. Therefore, the distance between the trajectory and the edge at the point closest to the edge of the laser irradiation trajectory is 2 mm, and the distance at the point farthest from the edge is 6 mm. The period of the sine wave trajectory is 8 mm.
【００２８】図６においてＸ軸方向の区間ａ、ｂおよび
ｄ、ｅは溶融部形成区間であり、区間ｃは溶接部形成区
間である。これら区間毎に、レーザ出力は図６の中段の
グラフに示すごとく、焦点位置は下段のグラフに示すご
とく制御を行ってレーザ照射を行った。ここで、レーザ
出力は最大４ｋＷ、最低２ｋＷの範囲内で、焦点位置は
最大鋼板上１０ｍｍ、最低鋼板直上の範囲内で制御を行
っている。この時使用した集光ミラーの焦点距離は１０
インチである。In FIG. 6, sections a, b, d, and e in the X-axis direction are sections where a fusion zone is formed, and section c is a section where a weld zone is formed. In each of these sections, laser irradiation was performed by controlling the laser output as shown in the middle graph of FIG. 6 and controlling the focus position as shown in the lower graph. Here, the laser output is controlled within a range of a maximum of 4 kW and a minimum of 2 kW, and the focus position is controlled within a range of 10 mm above the maximum steel plate and directly above the minimum steel plate. The focal length of the focusing mirror used at this time was 10
Inches.
【００２９】上記のように溶接し、実施例１で用いた判
定基準を適用したところ、外観検査およびＸ線透過試験
とも良好と判定された。When welding was performed as described above and the criteria used in Example 1 were applied, both the appearance inspection and the X-ray transmission test were determined to be good.
【００３０】[0030]
【発明の効果】本発明によれば、亜鉛めっき鋼板のレー
ザによる重ね溶接をブローホールの欠陥の発生なく簡便
に行うことができ、産業上利すること甚大である。According to the present invention, lap welding of a galvanized steel sheet by laser can be easily performed without occurrence of a defect in a blow hole, which is extremely advantageous for industrial use.
【図１】本発明の方法における溶接部の断面図FIG. 1 is a sectional view of a weld in the method of the present invention.
【図２】本発明の方法における溶接部の断面図FIG. 2 is a sectional view of a weld in the method of the present invention.
【図３】本発明の実施例を示す溶接部の平面図FIG. 3 is a plan view of a welded portion showing the embodiment of the present invention.
【図４】本発明の実施例を示す溶接部の平面図FIG. 4 is a plan view of a welded portion showing the embodiment of the present invention.
【図５】本発明の実施例を示す溶接部の平面図FIG. 5 is a plan view of a welded portion showing an embodiment of the present invention.
【図６】本発明の実施例におけるレーザ照射軌跡とレー
ザ出力、焦点位置の制御を示すグラフFIG. 6 is a graph showing control of a laser irradiation trajectory, a laser output, and a focus position in the embodiment of the present invention.
１、２ 亜鉛めっき鋼板 ３、４、３ａ、３ｂ、４ａ、４ｂ 拘束具 ５ 端部 ６ レーザ照射トーチ ７ 溶融部 ８ 溶接ビード（溶接部） ９ 隙間 １０ レーザ照射軌跡 1, 2 Galvanized steel sheet 3, 4, 3a, 3b, 4a, 4b Restrictor 5 End 6 Laser irradiation torch 7 Fused part 8 Weld bead (welded part) 9 Gap 10 Laser irradiation locus
───────────────────────────────────────────────────── フロントページの続き (72)発明者 百合岡 信孝 千葉県富津市新富20−１ 新日本製鐵株 式会社 技術開発本部内 (72)発明者 柄沢 卓二 千葉県富津市新富20−１ 新日本製鐵株 式会社 技術開発本部内 (56)参考文献 特開 昭62−134117（ＪＰ，Ａ) 特開 平２−89522（ＪＰ，Ａ) 特開 昭53−94240（ＪＰ，Ａ) 実開 平１−118889（ＪＰ，Ｕ) 実開 昭58−175888（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) B23K 26/00 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Nobutaka Yurioka 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Corporation Technology Development Division (72) Inventor Takuji Karasawa 20-1 Shintomi, Futtsu-shi, Chiba New (56) References JP-A-62-134117 (JP, A) JP-A-2-89522 (JP, A) JP-A-53-94240 (JP, A) Hei 1-118889 (JP, U) Japanese Utility Model Showa 58-175888 (JP, U) (58) Field surveyed (Int. Cl. 7 , DB name) B23K 26/00
Claims (3)
接において、レーザ照射側にある前記亜鉛めっき鋼板
（１）の端部（５）は拘束せずに前記亜鉛めっき鋼板
（１、２）を支持し、レーザ照射側の前記亜鉛めっき鋼
板（１）のみを重ね溶接部の中心位置より拘束側へ１〜
１５ｍｍ離れた位置において予めレーザを用いて溶融さ
せて端部（５）を変形させることにより前記亜鉛めっき
鋼板（１、２）の間に隙間を形成し、その後前記亜鉛め
っき鋼板（１、２）を重ね溶接することを特徴とする亜
鉛めっき鋼板のレーザ溶接方法。In lap welding of a galvanized steel sheet using a laser, the end (5) of the galvanized steel sheet (1) on the laser irradiation side is not restricted and the galvanized steel sheet (1, 2) is not welded. Support, and place only the galvanized steel sheet (1) on the laser irradiation side from the center position of the lap weld to the restraint side from 1 to
A gap is formed between the galvanized steel sheets (1 and 2) by deforming the end portion (5) by using a laser in advance at a position separated by 15 mm to form a gap between the galvanized steel sheets (1 and 2). Laser welding method for galvanized steel sheet, wherein lap welding is performed.
ことを特徴とする請求項１記載の亜鉛めっき鋼板のレー
ザ溶接方法。2. The laser welding method for a galvanized steel sheet according to claim 1, wherein the cut surface of the galvanized steel sheet is not melted.
は、鋼板（１、２）の重ね合わされた面にある目付け量
の合計をＸ（ｇｒ／ｍ 2 ）として、Ｇ＝２５／１２０×
Ｘ以上であり、かつ鋼板（１、２）の薄い方の板厚の５
０％以下であることを特徴とする請求項１または２に記
載の亜鉛めっき鋼板のレーザ溶接方法。 3. The gap G (μm) of a galvanized steel sheet.
Is the basis weight on the superposed surfaces of the steel plates (1, 2)
Is defined as X (gr / m 2 ), G = 25/120 ×
X or more and 5 of the thinner steel plate (1, 2)
0% or less.
Laser welding method for galvanized steel sheet described above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05195247A JP3115456B2 (en) | 1993-07-13 | 1993-07-13 | Laser welding method for galvanized steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05195247A JP3115456B2 (en) | 1993-07-13 | 1993-07-13 | Laser welding method for galvanized steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0732180A JPH0732180A (en) | 1995-02-03 |
| JP3115456B2 true JP3115456B2 (en) | 2000-12-04 |
Family
ID=16337953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05195247A Expired - Fee Related JP3115456B2 (en) | 1993-07-13 | 1993-07-13 | Laser welding method for galvanized steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3115456B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101272050B1 (en) * | 2011-11-11 | 2013-06-07 | 주식회사 성우하이텍 | Method of laser welding |
| US8610026B2 (en) | 2009-01-20 | 2013-12-17 | Honda Motor Co., Ltd. | Laser welding method |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19605341B4 (en) * | 1995-02-24 | 2009-07-09 | Volkswagen Ag | Method for welding two galvanized sheets to be joined |
| DE10031377B4 (en) * | 2000-06-28 | 2010-07-22 | Volkswagen Ag | Method for joining two sheets by laser welding |
| WO2002087816A2 (en) * | 2001-04-27 | 2002-11-07 | Honda Giken Kogyo Kabushiki Kaisha | Method and appratus for laser beam welding of overlapping sheets |
| JP4099642B2 (en) * | 2002-04-03 | 2008-06-11 | トヨタ自動車株式会社 | Laser welding method for surface-treated steel sheet |
| JP4344221B2 (en) * | 2003-11-17 | 2009-10-14 | 新日本製鐵株式会社 | Lap laser welding method of galvanized steel sheet and welded joint of lap welded galvanized steel sheet |
| JP4537287B2 (en) * | 2005-08-05 | 2010-09-01 | 本田技研工業株式会社 | Laser welding method and apparatus |
| JP5191117B2 (en) * | 2006-11-30 | 2013-04-24 | 本田技研工業株式会社 | Laser welding method |
| CA2819095C (en) * | 2010-12-17 | 2018-09-04 | Magna International Inc. | Laser beam welding |
| KR101429529B1 (en) | 2012-11-06 | 2014-08-19 | 주식회사 성우하이텍 | Method of laser welding |
| KR101368631B1 (en) * | 2013-01-17 | 2014-03-07 | 국립대학법인 울산과학기술대학교 산학협력단 | Laser welding quality improvement by controlling the direction of welding with respect to part-to-part gap |
| CN103785949B (en) * | 2013-11-29 | 2015-10-14 | 邱博 | Laser soldering device and method for laser welding |
| KR102200937B1 (en) * | 2013-12-23 | 2021-01-11 | 주식회사 성우하이텍 | Method of laser welding |
| WO2017035728A1 (en) * | 2015-08-31 | 2017-03-09 | GM Global Technology Operations LLC | Method for laser welding steel workpieces |
| DE112015006848T5 (en) * | 2015-08-31 | 2018-05-17 | GM Global Technology Operations LLC | Method for laser welding of aluminum workpieces |
| CN110369868B (en) * | 2018-04-12 | 2021-07-06 | 中国科学院上海光学精密机械研究所 | Laser welding method for coated metal workpiece |
| JP2019217546A (en) | 2018-06-22 | 2019-12-26 | 株式会社神戸製鋼所 | Joining method and joint structural body of plated steel sheet |
| CN109530953B (en) * | 2019-01-14 | 2021-04-06 | 烟台蓝鲸增材有限公司 | Zero-deformation welding process for combination of ultra-large precision forgings |
| CN109848560B (en) * | 2019-03-18 | 2021-02-02 | 中国科学院上海光学精密机械研究所 | Laser-arc composite heat source device and welding method thereof |
| CN114029619A (en) * | 2021-12-09 | 2022-02-11 | 江苏星河激光科技有限公司 | Method and system for controlling laser lap welding spatter based on broken line scanning track |
-
1993
- 1993-07-13 JP JP05195247A patent/JP3115456B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8610026B2 (en) | 2009-01-20 | 2013-12-17 | Honda Motor Co., Ltd. | Laser welding method |
| KR101272050B1 (en) * | 2011-11-11 | 2013-06-07 | 주식회사 성우하이텍 | Method of laser welding |
| US9873168B2 (en) | 2011-11-11 | 2018-01-23 | Sungwoo Hitech Co., Ltd. | Method of laser welding |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0732180A (en) | 1995-02-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3115456B2 (en) | Laser welding method for galvanized steel sheet | |
| JP6846619B2 (en) | Laser welding method | |
| JP5196128B2 (en) | Laser welding method | |
| US5591360A (en) | Method of butt welding | |
| JP3159593B2 (en) | Laser processing method and apparatus | |
| JP4612076B2 (en) | Laser welding method for metal plated plate | |
| RU2547987C1 (en) | Laser welding method | |
| JP2008049392A (en) | Laser welding method | |
| EP1003624A1 (en) | Method of laser beam welding of zinc-coated steel sheet | |
| JP4344221B2 (en) | Lap laser welding method of galvanized steel sheet and welded joint of lap welded galvanized steel sheet | |
| JP3767375B2 (en) | Method of lap welding of galvanized steel sheet and welded thin sheet | |
| JP5125001B2 (en) | Laser welding method, apparatus and equipment | |
| JP2002178178A (en) | Laser lap welding method for metal with surface coating | |
| JP2011115836A (en) | Method of laser welding metal plated plate | |
| JP4232024B2 (en) | Weld bead structure and welding method | |
| KR101428973B1 (en) | Method of laser welding | |
| EP1118420A2 (en) | Inclined beam lap welding | |
| JP2880061B2 (en) | Laser processing | |
| JP2713000B2 (en) | Laser welding method of damping steel plate | |
| JPH07323386A (en) | Laser welding method | |
| JPH04138888A (en) | Laser beam machining head | |
| JPH02268991A (en) | Laser welding method for galvanized steel sheet | |
| KR102158855B1 (en) | Laser welding apparatus and method | |
| JP2006346709A (en) | Laser welding method for thin sheet edge joint | |
| JPH10156566A (en) | Pulse yag laser beam welding method for lap joint of galvanized steel sheet |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20000912 |
|
| LAPS | Cancellation because of no payment of annual fees |