JPH0520191B2 - - Google Patents
Info
- Publication number
- JPH0520191B2 JPH0520191B2 JP60199224A JP19922485A JPH0520191B2 JP H0520191 B2 JPH0520191 B2 JP H0520191B2 JP 60199224 A JP60199224 A JP 60199224A JP 19922485 A JP19922485 A JP 19922485A JP H0520191 B2 JPH0520191 B2 JP H0520191B2
- Authority
- JP
- Japan
- Prior art keywords
- laser beam
- butt
- welding
- energy
- beam 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 - Lifetime
Links
- 238000003466 welding Methods 0.000 claims description 35
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 3
- 230000035939 shock Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 239000010410 layer Substances 0.000 description 17
- 238000005452 bending Methods 0.000 description 11
- 238000005336 cracking Methods 0.000 description 6
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 239000011324 bead Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000010287 polarization Effects 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は表面を絶縁被覆処理した電磁鋼板の突
合せレーザビーム溶接に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to butt laser beam welding of electromagnetic steel sheets whose surfaces have been subjected to insulation coating treatment.
絶縁被覆処理した電磁鋼板をレーザビームで突
合せ溶接する溶接法は、例えば特開昭58−151984
号公報および特開昭58−151985号公報に開示され
ている。電磁鋼板のレーザビーム溶接では、溶接
部にワレを発生し易く、また、溶接部の曲げ強度
が低い。そこで特開昭60−37282号公報には、鋼
板の突合せ部の表面が極く薄い層で溶融する程度
にレーザビーム照射で予熱し、次いでレーザビー
ムで突合せ溶接し、更に、また極く薄い層で溶融
する程度にレーザビーム照射で後熱して溶接部の
ワレを低減するレーザビーム突合せ溶接法が提案
されている。
A welding method for butt welding electrical steel sheets coated with insulation using a laser beam is described, for example, in JP-A-58-151984.
No. 58-151985. Laser beam welding of electromagnetic steel sheets tends to cause cracks in the welded portion, and the bending strength of the welded portion is low. Therefore, Japanese Patent Application Laid-open No. 60-37282 discloses that the surfaces of the butt portions of the steel plates are preheated by laser beam irradiation to the extent that they are melted in an extremely thin layer, then butt welded with a laser beam, and then an extremely thin layer is melted. A laser beam butt welding method has been proposed in which the weld is post-heated by laser beam irradiation to the extent that it melts to reduce cracking in the weld.
しかしながらこれによつても、ワレが発生した
りすることがあり、また、溶接部の曲げ強度の大
幅な上昇は困難である。
However, even with this, cracking may occur, and it is difficult to significantly increase the bending strength of the welded portion.
本発明者の検討によると、電磁鋼板の絶縁被覆
層は、鋼板１に接触するグラス層３（１〜2μ厚
のMgOとSiO2でなる下層）とその表面の絶縁被
覆（４〜5μ厚の、リン酸系被覆）で構成されて
いるが、上記従来のレーザビーム突合せ溶接で
は、レーザビーム照射により上層のＰが溶接ビー
ド中に固溶され、溶接中の鉄の強度を低下させる
原因となり、溶接中にワレ（高温ワレ）を生ずる
ことがあり、また、曲げ強度を著しく低下させ
る。 According to the inventor's study, the insulating coating layer of the electrical steel sheet consists of the glass layer 3 (lower layer made of MgO and SiO 2 with a thickness of 1 to 2 μm) in contact with the steel plate 1 and the insulating coating on the surface thereof (the lower layer made of MgO and SiO 2 with a thickness of 4 to 5 μm). However, in the conventional laser beam butt welding described above, the upper layer of P is dissolved in the weld bead by laser beam irradiation, which causes a decrease in the strength of the iron during welding. Cracks (high-temperature cracks) may occur during welding, and the bending strength will be significantly reduced.
本発明は溶接中のワレを更に低減することを第
１の目的とし、溶接中のワレを更に低減し突合せ
溶接部の曲げ強度を高くすることを第２の目的と
する。 A first object of the present invention is to further reduce cracking during welding, and a second object is to further reduce cracking during welding and increase the bending strength of a butt weld.
上記目的を達成するために本発明においては、
まず突合せ溶接におけるレーザビーム照射（第２
回）のエネルギーの35〜45％のエネルギーで、第
１図に示すように、突合せレーザビームLB1を照
射（第１回）して絶縁被覆を熱衝撃により破砕し
レーザービーム照射に伴なうシールドガスにより
突合せ部より吹き飛ばして除去し、その後第２図
に示すように、全厚溶接に要するエネルギーのレ
ーザLB2で突合せ溶接（第２回）を行う。そし
て、好ましくは、曲げ強度を更に高くするため
に、その後突合せレーザビーム溶接（第２回）の
エネルギーの55〜75％のエネルギーでレーザービ
ームを突合せ溶接部に照射する。（第３回）。
In order to achieve the above object, in the present invention,
First, laser beam irradiation in butt welding (second
As shown in Figure 1, the butt laser beam LB 1 is irradiated (first time) with 35 to 45% of the energy of It is blown away from the butt part using shielding gas, and then, as shown in FIG. 2, butt welding (second time) is performed using laser LB 2 with the energy required for full-thickness welding. Then, preferably, in order to further increase the bending strength, the butt welded portion is then irradiated with a laser beam with an energy of 55 to 75% of the energy of the butt laser beam welding (second time). (Part 3).
突合せ溶接におけるレーザビーム照射（第２
回）のエネルギーの35〜45％のエネルギーで突合
せ部にレーザービームを照射（第１回照射）する
と、鋼板１に接触するグラス層３（１〜2μ厚の
MgOとSiO2でなる下層）とその表面の絶縁被覆
層（４〜5μ厚の、リン酸系被覆）の該上層４が
熱衝撃により破壊し、レーザビーム照射光路に吹
付けられるシールドガスにより吹き飛ばされて、
下層３が露出する（第２図）。これにより鋼板表
面の色が茶色から灰白色に変化する。この第１回
のレーザビーム照射のエネルギーを、突合せ溶接
におけるレーザビーム照射（第２回）のエネルギ
ーの35〜45％の範囲にするのは、鋼板１の厚みに
より、該上層を破砕飛散させるに要する投入エネ
ルギー量が異なるからである。いずれにしても上
限は、Ｐの固溶を防ぐために、鋼板１の表面が溶
融しないものとする。下限は、上層４が破砕くさ
れてシールドガスで飛ばさせるに要するものとす
る。これにより、突合せ部溶接において、溶接中
にＰの固溶がなくなり、ワレ発生が大幅に低減し
曲げ強度が高くなる。突合せ溶接（第２回）後
の、突合せレーザビーム溶接のエネルギーの55〜
75％のエネルギー密度で第３回のレーザービーム
照射を突合せ溶接部に与えると、突合せ部の曲げ
強度が更に高くなる。
Laser beam irradiation in butt welding (second
When the abutting portion is irradiated with a laser beam (first irradiation) with an energy of 35 to 45% of the energy of the glass layer 3 (1 to 2μ thick
The lower layer consisting of MgO and SiO 2 ) and the upper layer 4 of the insulating coating layer (4-5μ thick, phosphoric acid coating) on its surface are destroyed by thermal shock and are blown away by the shielding gas sprayed into the laser beam irradiation optical path. Been,
The lower layer 3 is exposed (FIG. 2). As a result, the color of the steel plate surface changes from brown to grayish white. The reason why the energy of this first laser beam irradiation is set in the range of 35 to 45% of the energy of the laser beam irradiation (second time) in butt welding is due to the thickness of the steel plate 1, in order to crush and scatter the upper layer. This is because the amount of input energy required is different. In any case, the upper limit is such that the surface of the steel plate 1 does not melt in order to prevent solid solution of P. The lower limit is the value required for the upper layer 4 to be crushed and blown away by the shielding gas. As a result, in butt welding, solid solution of P is eliminated during welding, occurrence of cracking is significantly reduced, and bending strength is increased. After butt welding (2nd time), the energy of butt laser beam welding is 55~
Applying a third laser beam irradiation to the butt weld with an energy density of 75% further increases the bending strength of the butt weld.
第３図、第４図および第５図に、厚み0.35mm
の、上記下層３および上層４を有する方向性電磁
鋼板の突合せレーザビーム溶接を行つた結果を示
す。
In Figures 3, 4 and 5, the thickness is 0.35mm.
The results of butt laser beam welding of grain-oriented electrical steel sheets having the lower layer 3 and upper layer 4 described above are shown.
第３図は溶接時のレーザエネルギーに対して、
第１回目のレーザエネルギーを０〜70％まで変化
した場合の溶接部の曲げ強度（回数、Ｒ＝５mm）
を示す。30％から急に曲げ回数が増加し35〜45％
で最大となるが、これ以上では、溶接部の表面の
極く薄い層が溶融するためである。なお第４図は
第１回レーザエネルギーが60％時の溶接ビート中
央部のＰを成分分析した結果であり、明確にビー
ド内にＰの偏折が検出されている。 Figure 3 shows the laser energy during welding.
Bending strength of welded part when the first laser energy is changed from 0 to 70% (number of times, R = 5 mm)
shows. The number of bends suddenly increases from 30% to 35-45%.
This is because the extremely thin layer on the surface of the weld zone will melt if it exceeds this point. FIG. 4 shows the result of component analysis of P in the center of the welding bead when the first laser energy was 60%, and polarization of P was clearly detected within the bead.
また、第５図は、溶接エネルギーに対する、第
３回エネルギーレザーの割合を０〜100％まで変
化した場合の曲げ強度（曲げ回数）を示す（な
お、第１回レーザエネルギーは40％）ように55〜
75％で曲げ回数が向上しており、80％以上になる
と結晶粒が粗大化するために、曲げ回数が低減す
るものである。 In addition, Figure 5 shows the bending strength (number of bends) when the ratio of the third energy laser to the welding energy is changed from 0 to 100% (the first laser energy is 40%). 55～
At 75%, the number of bends increases, and when it exceeds 80%, the crystal grains become coarser, so the number of bends decreases.
［発明の効果］
以上の通り本発明によれば、電磁鋼板のレーザ
ビーム突合せ溶接においてワレの発生が防止さ
れ、しかも溶接部の曲げ強度が大幅に高くなる。[Effects of the Invention] As described above, according to the present invention, cracking is prevented from occurring during laser beam butt welding of electromagnetic steel sheets, and the bending strength of the welded portion is significantly increased.
第１図は、レーザビーム照射前の電磁鋼板の突
合せ断面を示す断面図、第２図は本発明により第
１回のレーザビーム照射直後の電磁鋼板の突合せ
断面を示す断面図である。第３図及び第５図は電
磁鋼板の突合せ部へのレーザビーム溶接エネルギ
ーに対する、第１回及び第３回レーザビーム照射
エネルギーの比率と曲げ回数の関係を示すグラ
フ、第４図は第１回レーザビーム照射60％時の溶
接近傍のＰ濃度分析結果を示すグラブである。
１，２……電磁鋼板、３……下層、４……上
層、LB1，LB2……レーザビーム。
FIG. 1 is a cross-sectional view showing butt cross sections of electromagnetic steel sheets before irradiation with a laser beam, and FIG. 2 is a cross-sectional view showing a butt cross section of electromagnetic steel sheets immediately after the first laser beam irradiation according to the present invention. Figures 3 and 5 are graphs showing the relationship between the ratio of the first and third laser beam irradiation energy and the number of bending times to the laser beam welding energy for the butt part of electromagnetic steel sheets, and Figure 4 is for the first This is a graph showing the P concentration analysis results near the weld when laser beam irradiation is 60%. 1, 2...Electromagnetic steel plate, 3...Lower layer, 4...Upper layer, LB1 , LB2 ...Laser beam.
Claims (1)
ビーム溶接において、突合せレーザビーム溶接の
エネルギーの35〜45％のエネルギーで突合せ部に
レーザービームを照射して絶縁被覆を熱衝撃によ
り破砕しレーザービーム照射に伴なうシールドガ
スにより突合せ部より除去し、その後レーザビー
ム溶接により突合せ部を溶接することを特徴とす
る、電磁鋼板の突合せレーザビーム溶接方法。 ２ 前記その後のレーザービーム溶接は、レーザ
ビーム溶接後に、突合せレーザビーム溶接のエネ
ルギーの55〜75％のエネルギー密度でレーザービ
ームを突合せ溶接部に照射する後照射を含む、前
記特許請求の範囲第１項記載の電磁鋼板の突合せ
レーザビーム溶接方法。[Claims] 1. In butt laser beam welding of electrical steel plates treated with insulation coating, the butt portion is irradiated with a laser beam with an energy of 35 to 45% of the energy of butt laser beam welding to remove the insulation coating by thermal shock. A method for butt laser beam welding of electromagnetic steel sheets, which comprises crushing and removing the material from the butt part using a shielding gas accompanying laser beam irradiation, and then welding the butt part by laser beam welding. 2. The subsequent laser beam welding includes, after the laser beam welding, post-irradiation in which the butt weld is irradiated with a laser beam at an energy density of 55 to 75% of the energy of the butt laser beam welding. Butt laser beam welding method for electromagnetic steel sheets as described in .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60199224A JPS6261790A (en) | 1985-09-09 | 1985-09-09 | Laser beam welding method for electrical steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60199224A JPS6261790A (en) | 1985-09-09 | 1985-09-09 | Laser beam welding method for electrical steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6261790A JPS6261790A (en) | 1987-03-18 |
| JPH0520191B2 true JPH0520191B2 (en) | 1993-03-18 |
Family
ID=16404208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60199224A Granted JPS6261790A (en) | 1985-09-09 | 1985-09-09 | Laser beam welding method for electrical steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6261790A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03110090A (en) * | 1989-09-26 | 1991-05-10 | Matsushita Electric Works Ltd | Method for welding insulating coated metallic member |
| DE502007002575D1 (en) * | 2006-08-04 | 2010-02-25 | Rasselstein Gmbh | METHOD FOR PRODUCING A CORROSION-RESISTANT AND FORMABLE LAMINATE WITH COMPLETE COATINGS OF THE FILLED THERMALLY TREATED STEEL PLATE |
| JP4890375B2 (en) * | 2007-07-27 | 2012-03-07 | 三菱電機株式会社 | Manufacturing method of stator of rotating electric machine |
| CN105689896A (en) * | 2016-03-23 | 2016-06-22 | 昆山宝锦激光拼焊有限公司 | Coating removing and welding integrated laser processing method for hot-rolled steel plates |
-
1985
- 1985-09-09 JP JP60199224A patent/JPS6261790A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6261790A (en) | 1987-03-18 |
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