| 摘要 |
PURPOSE:To improve the performance of a weld zone, and also to reduce the welding electric power and the use quantity of a welding material by butting each end part of a steel plate, executing its tack welding by a laser welding, and thereafter, executing its regular welding from both the surface and the reverse side. CONSTITUTION:As for a groove shape of base materials 1, 2 it is desirable that both a surface side groove angle alpha and a reverse side groove angle betabecome a range of 50-90 deg.. Also, surface side groove depth (a), a reverse side groove depth (c), and a butt surface thickness (b) are set so as to become almost equal to each other. That is, they are set so as to become 30-40% of a plate thickness. With respect to the groove of such a shape, tack welding is executed by a laser welding from the surface side. Thereafter, with respect to the side to which the tack welding has been executed, regular welding is started from the opposite side. In this way, a good weld junction part can be obtained.
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