| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for continuously welding a steel strip in the longitudinal direction by which in the case of producing the welded steel strip by butting the steel strips in the width direction and continuously welding in the longitudinal direction, the welded steel strip without causing defective welding such as a thickness reducing phenomenon at the welded part and penetration, can be produced at a low cost and in high productivity by improving the edge shape at the welding side of the steel strip. SOLUTION: As at least a steel strip l1 at a reference side, a steel strip is used which has in an edge at a welding side scarcely any burr or has a burr of <=20μm in length (bh) and of <=30μm in the maximum depth (cd) from an edge end in a concave fracture surface, and as a steel strip l2 at an approaching side, a steel strip is used which has in an edge at a welding side scarcely any burr or has a burr of 40μm in length (bh) and of <=60×m in the maximum depth (cd) from the edge end in a concave fracture surface, and a butt part is welded with a laser beam.</p> |
