Welding When Contacts Close Electrical Circuits

Abstract

The paper presents analysis of the welding due to pre-arcing contacts and due to bounce arcs. Welding happens following arcing at make or break where the arc roots generate over 10 times more heat than seen in the former constriction example and thus melt and soften the contact material, arc welding. The higher the value of velocity of contact closing, the shorter the arcing time. High velocity has a negative aspect since it causes bouncing of contacts finger from the butt. Welding caused by solidification of a molten metal bridge is an extreme case of resistance welding. The welding force increases during the early operation cycles.