| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a butt welding method of a metallic sheet by which the generation of blowholes having a size of≥40μm in the diameter is prevented. <P>SOLUTION: By making a heat source 12 scan along the butted part 11 where the edges of the metallic sheet are butted each other and forming a molten zone 17 including the butted part 11 by irradiating energy from the heat source 12 and the butted part 11 is integrated. The heat source 12 is provided with the power density of 3-5 kW/mm<SP>2</SP>and the butted part 11 is irradiated with the energy from the heat source 12 so that the width of the molten zone 17 is≥3.9 times the thickness of the metallic sheet 1. The butted part 11 is irradiated with the energy from the heat source 12 so that the width of the molten zone 17 is preferably in the range of 3.9-7.8 times the thickness of the metallic sheet 1, furthermore, preferably in the range of 4.8-7.8 times. The heat source 12 is a semiconductor laser or a plasma arc. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
