| 摘要 |
PURPOSE:To equalize a temperature distribution, to prevent a welding failure, and to stably obtain the weld zone of a high quality, by heating both end parts in the width direction of the butting part of a steel sheet, and executing the welding under such a temperature condition as the temperature of both end parts in the width direction satisfies a specific expression. CONSTITUTION:Heating devices 3, 3 are provided on both end parts in the width direction of the junction part 4 of steel plates 1a, 1b held by electrodes 2a, 2b and clamps 5a, 5b. By these heating devices 3, 3, both end parts in the width direction of the junction part 4 are heated, and when the temperature of both end parts in the width direction, and the temperature of positions of 40mm to the center side from each end face are denoted as T1a, T1b, and T2a, T2b, respectively, welding is executed under such a condition as an expression 1000<=T1a<=(T2a+200) deg.C, and an expression 1000<=T1b<=(T2b+200) deg.C are satisfied. In such a way, the generation of the welding failure is prevented.
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