| 摘要 |
PURPOSE:To perform tack welding to form continuously a stable bead with high speed by using a plural electrode and controlling the change of the weld current of the proceeding electrode and the electrode interval according to the change of weld speed at the same time of welding. CONSTITUTION:A weld current, an electrode interval and the weld speed are established to the specified value by using a plural electrode, such as a proceeding 1 and a succeeding electrode 2 and a weld metal 4 is formed by arcs 3, 5. When tack welding is carried out, the weld speed is detected at the same time of welding and the change of a weld current and an electrode interval of a proceeding electrode 1 are controlled according to the change of the weld speed. Therefore, a stable and continuous bead is formed by high speed tack welding from the base metal edge which changing the weld speed slowly so as to reach the specified weld speed from slow weld speed in the welding start point of a tab plate. Consequently, the occurrence of welding defects are prevented. |
