Dependency of arc efficiency on welding current in gas metal arc welding

Abstract

Arc efficiency of gas metal arc welding was measured in changing welding current. Increasing welding current, arc efficiency showed convex curve. Estimating amount of heat transferred by metal droplets, it was concluded that increase of arc efficiency in the welding current less than 186 A was caused by heat of metal transfer, while decrease in the welding current more than 186 A was caused by overwhelming arc radiation.