METHOD OF WELDING HOT PRESS MOLDING

• Main Authors: UEHARA KAZUNARI, TAKESHITA KEISUKE
• Format: Patent
• Language: English; Japanese
• Published: 17.06.2021
• Subjects: CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TRANSPORTING; WELDING; WORKING BY LASER BEAM

To provide a method of welding a hot press molding that can stabilize quality of a weld zone when spot welding is performed.SOLUTION: A fiber laser oscillator 51a is used to irradiate, with laser light L1, welding predetermined regions A1 surrounding a plurality of dotting predetermined parts X1 of spot welding on a surface of a hot press molding P1 respectively in a rectangular shape, and thus an oxide coating W1 sticking on the welding predetermined region A1 is vaporized to reduce the film thickness, so that the film thickness of the oxide coating sticking on the welding predetermined region is less than the film thickness of the oxide coating sticking on regions except the welding predetermined region, and also left as thick as a predetermined quantity.SELECTED DRAWING: Figure 3 【課題】スポット溶接を実施した際に溶接部の品質を安定させることができるホットプレス成形品の溶接方法を提供する。【解決手段】ホットプレス成形品Ｐ１の表面における複数のスポット溶接の打点実施予定部Ｘ１をそれぞれ矩形状に囲う溶接予定領域Ａ１に対し、ファイバーレーザ発振器５１ａを用いてレーザ光Ｌ１を照射して溶接予定領域Ａ１に付着する酸化被膜Ｗ１を気化させて膜厚を減らして、溶接予定領域に付着する酸化被膜の膜厚が当該溶接予定領域を除く領域に付着する酸化被膜の膜厚よりも薄くなるように、且つ、所定量の厚みだけ残るようにする。【選択図】図３