| 摘要 |
PURPOSE:To perform welding without defects at the time of forming extremely thin metallic foil in a wedge shape and performing laser beam welding thereon to manufacture a tube by melting a specified region of a wedge-shaped part which is abutted and formed into the tube and pressing molten end faces against each other to perform welding just before being solidified. CONSTITUTION:When the extremely thin metallic foil 1 is formed continuously in the wedge shape and subjected to laser beam welding to manufacture the tube, it is formed into the tube by using a mandrel 6 and a point where a wedge-shaped part gap is made to one to five times of thickness of the extremely thin metallic foil 1 is irradiated with a defocussed YAG laser beam and the region of two-ten times of thickness of the metallic foil from the end faces is molten. These molten end faces are pressed against each other just before being solidified to complete welding. By this method, the tube of the extremely thin metallic foil can be welded stably without causing burn through and weld defects. |
