WAVEFORM CONTROL FOR HIGH SPEED GMA WELDING

摘要

A waveform control method for GMA(Gas Metal Arc) high speed welding is provided to stably progress the GMA high speed welding and improve productivity by restricting the stubbing, instant short-circuit, and long-pending arc phenomena through the control of the welding current. A waveform control method for GMA high speed welding comprises a first step of guiding the rapid solution of the short-circuit by keeping the current rising gradient of the 150~300A/ms welding current during the short-circuit; a second step of delaying 8~12ms after the arc is generated; and a third step of guiding the short-circuit by reducing 40~60A current after the time delay.