| 摘要 |
PURPOSE:To stabilize the arc state without regulating pulse current and to improve the quality in a weld zone by superposing the pulse current of which the frequency is changed at every specified period on the base current and performing welding. CONSTITUTION:When pulse peak current IP is superposed on base current IB, the pulse frequency changes from a high to low frequency and this change is repeated at a period T. The pulse frequency may be changed from a low to a high frequency in this case. Although the change of the frequency (f) is linear, said frequency may be changed curvilinearly. If the welding is performed by changing repeatedly the pulse frequency at every period in the above-mentioned way, the transfer of the molten metal at the tip of the welding wire arises one time at every period T. There is therefore no need for adjusting the pulse frequency. |
