| 摘要 |
PURPOSE:To prevent cracking in flanging by increasing the output of a welding machine and the pressure of a working gas, executing welding and forming notched holes of a desired diameter to the end part of welding. CONSTITUTION:A feed speed (a) is held at zero or a slight speed and welding is executed under the increased pressure (c) of the working gas at the time of subjecting plate stocks 1, 2 to Tee butt welding by the laser welding machine. The ends 3a, 3b are overheated and lack of penetration arises when the output of a torch is increased. The working gas of a high pressure is blown in this state and therefore, the notched holes 4, 5 of desired 3-5mm diameter can be formed at the end parts 3a, 3b of welding. Since the notched holes are formed simultaneously to the desired size during laser welding by the above-mentioned method, the generation of cracking during flanging is prevented. |
