Reducing Spatter for CO₂ Welding Using Inverter with Satiable Inductor

The energy accumulated within hundreds of microseconds before the rupturing time point of the short circuit liquid bridge influences directly the spatter level in CO₂ short circuit transfer welding. Focusing on the normal inverter's dynamic characteristics which can not satisfy the requirement of reducing current quickly before the time of rupturing of the bridge, a new current wave controlling method for short circuit transfer CO₂ welding using satiable inductor is put forward in this paper. Theory analysis and experiment results prove that the inverter's dynamic characteristics is greatly improved, the declining speed of current during liquid bridge neck shrinking is quicker, subsequently the energy accumulated in the bridge and the radius of the bridge before rupturing is reduced. The spatter is effectively reduced.