| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lap fillet welding method which does not cause hot cracking such as solidification cracking or liquefaction cracking in the case of decreasing an overlap amount to reduce the weight of members when two overlapped steel sheets are welded by fusing the ends of the upper steel sheet and the lower steel sheet. Ž<P>SOLUTION: In the lap fillet welding method, two steel sheets are overlapped and the end of the upper steel sheet and the lower steel sheet are fused and welded along the end of the upper steel sheet. The fused portion is formed at a position which is away from the end of the lower steel sheet by the minimum long evasive distance L1 (mm) or more defined by the formula; L1 (mm)=-0.08×V-h+8, or at a position which is away from the end of the lower steel sheet by the maximum short evasive distance L2 (mm) or less defined by the formula; L2 (mm)=-0.08×V+h+3. In the above formulas, V is welding speed (mm/sec) and h is thickness (mm) of the lower steel sheet. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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