| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method of laser welding, which method does not generate gas and splash from the coating film of welding material, and does not require complicated clearance control using a fixture, and can secure a stable welding quality having high repeatability. <P>SOLUTION: In a first process for removing a coating film, respective pealing zones H<SB>10</SB>determined at the portions corresponding to welding points W of a steel plate 12 are irradiated by converging a pulse laser beam LBa for removing the coating film, and galvanized coating films 10 within the pealing zones H<SB>10</SB>are sublimated and removed by the energy of the pulse laser beam LBa. In a second process for laser spot welding, the welding points W of the welding materials (12, 14) are irradiated by converging a pulse laser beam LBb for laser beam welding from the reverse side (above) of the stainless steel plate 14, and the stainless steel plate 14 and the steel plate 12 are welded by the energy of the pulse laser beam LBb. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
