| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a shape steel which is perfect non-magnetic steel and sufficient in welding strength by achieving the copy welding of a long member consisting of austenitic stainless steel with the YAG laser beam in which the effective range of the depth of focus is expanded by increasing the beam radius while detecting a weld seam by a contact type detector. SOLUTION: A shape steel is a long plate 1-6 mm to 1-12 mm in thickness and >=2 m in length. In welding the plate, a member 2 to be welded is placed on a frame 1, a traveling truck 9 on which a copying device 3 is loaded is mounted on rail 11 on a base, and traveled parallel to the member 2 to be welded. A contact type detector 5 and a laser beam machining head 6 are arranged along the weld seam, and fixed to an arm 10 of the copying device 3 in a movable manner together with the traveling truck 9. The contact type detector 5 has ±0.1 mm in detection accuracy, 0.7-1.0 mm in beam radius, and 300-2000 mm/min in welding speed, and the required welding depth is secured without causing deviation from the weld seam. |
