WATER ROD TAB WELDING METHOD

摘要

PROBLEM TO BE SOLVED: To obtain a welding method for automatically welding a tab onto the outer surface of a tube with a large diameter of a water rod. SOLUTION: A tube 1 with a large diameter of a water rod is placed around an axial line so that it can be rotated, the tube 1 with a large diameter is rotated and fixed so that a first surface being welded initially to a tab 4 is at a specific angle to a laser beam axis, and then the first surface of the tab is welded to the tube with a large diameter by laser beams. After that, the tube 1 with a large diameter is rotated so that it passes through its center axis line and the tab 4 is at a symmetrical position for a plane that is in parallel with a laser beam axis 13. Then, a condensation optical system 10 is moved at the upper portion of the welding part of a second surface of the tab 4 for welding.