| 摘要 |
PURPOSE:To eliminate the unevenness in heat inputting at both side parts of a plate end face, to prevent a defective joining and to stabilize the strength of a joining part by welding the vicinity of the end face abutting part of a thin steel plate with heating it from both side parts thereof. CONSTITUTION:The narrow area WXL of a thin steel plate 2 is heated by using the light source for high density of a high frequency coil, laser torch or halogen lamp, etc. The heating is performed by setting to the time when a butt part starts a rotary deformation and the heating temp. is restrained as low as possible. With this method, the strength of the joining part is stabilized.
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