Is Expulsion a Sign of a Quality Resistance Spot Weld?
What is Expulsion in Resistance Spot Welding? In a resistance weld, expulsion is the forceful ejection of molten metal from the weld. Expulsion can occur at the tip to workpiece interface or at any faying surface. Expulsion is caused by the lack of containment of the expanding molten material between the electrode tip faces. Is…