METHOD FOR CONTROLLING WELDING CURRENT IN NON-CONSUMABLE ELECTRODE TYPE GAS SHIELDED ARC WELDING, AND POWER UNIT

摘要

PROBLEM TO BE SOLVED: To provide a method for controlling a welding current in non-consumable electrode type gas shielded arc welding, a method easy to operate and capable of keeping all current values within the range of rated current, and also to provide a power unit.;SOLUTION: With a first period Tu and a second period Td fixed that are alternately repeated as well as an average current value Iw and a current amplitude Iy, a current on the plus or increasing end of the amplitude Iy is supplied in the first period Tu, while a current on the minus or decreasing end of the amplitude Iy is supplied in the second period Td. In addition, the average current value in the first and the second period Tu, Td is controlled to be the average current value Iw.;COPYRIGHT: (C)2006,JPO&NCIPI