METHOD AND DEVICE FOR CONTROLLING WELDING POWER SUPPLY TO AVOID SPUTTERING OF THE WELD MATERIAL

摘要

A welding power supply control device comprises first switch means (SW1 to SW4) consisting of at least one switching element to be turned on and off to control the output current, and a necking detector (26) for controlling the first switch means, wherein the current flows in a welding current attenuating loop (1, 2, 3, Rs, T, D1 or D2, 4, 1; 1, 2, 3, D, L) when the first switch means (SW1 to SW4) is switched off, the second switch means (SWD) activated by the necking detector (26) and inserted in the current attenuating loop and an impedance means (RA) consisting of at least one impedance element.