Projection Welding Failure Modes. While pub lished resistance spot welding schedules assume that welds are made without expulsion this seldom occurs in produc tion where a high percentage of spot welds are actually made with expulsion. Ton pull fracture partial thickness fracture and interfacial fracture are the three failure modes of nut projec-tion welded joints.
Ton pull fracture partial thickness fracture and interfacial fracture are the three failure modes of nut projec-tion welded joints. The plating should have a lower melting point than the base alloy. Weld fails in the pullout mode.
Failure mode effect analysis FMEA was done to determine the risk priority number RPN against each cause and factor with higher RPN was selected for improvement.
Projection Welding Projection welding is a resistance welding process wherein coalescence is produced by the heat obtained from resistance to electric flow through the work parts held together under pressure by predetermined points by projections embossments or intersections. The plating should have a lower melting point than the base alloy. Failures and their causes. Fatigue is the phenomenon that occurs in bolt materials as the result of cyclic variations of the applied stress.