| 摘要 |
PROBLEM TO BE SOLVED: To surely join metal strips each other in a state that a superposing allowance is reduced by setting the position where the tail end part of a preced ing metal strip is superposed on the succeeding metal strip to be clamped within the area of under specified value of the predetermined joining part. SOLUTION: The tail end part of a preceding metal strip is superposed on the tip end part of the succeeding metal strip by holding with a clamp to apply seam welding, and both metal strips are joined each other. A superposing allowance is decided based on at least one side of the dimension of thickness or width of the metal strip, the superposing allowance is set and also the both metal strips are held by the clamp within the area of under 6.0 mm of the predetermined joining part and are subjected to seam welding. Since the metal strips are held in the position nearer to the predetermined joining part, the deformation of the metal strips is restricted, the deviation of the superposing allowance in weld starting and finishing sides generating in the seam welding is held at a minimum. The compensating quantity of variation of the superposing allowance is set so that the weld finishing side compensating quantity becomes larger than the weld starting side one based on at least one side of the dimension of plate thickness or width of the metal strip.
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