Effect of the Tilting Welding Electrode on the Tensile-Shear Fatigue Property for the Resistance Spot Welding Galvanized Advanced High Strength Steel
摘要
Advanced high strength steelsAdvanced high strength steel (AHSSsAHSSs) with zinc coating are commonly jointed by employing resistance spot weldingResistance spot welding (RSW) technique. Unfortunately, the Zn coating can possibly trigger the formation of the liquid metal embrittlementLiquid metal embrittlement (LME) cracksCrack. The role of tilting electrodeTilting electrode in the tensile-shear fatigueFatigue property of the welding joint has not been systematically explored. In this study, the effect of the tilting electrodeTilting electrode on the tensile-shear fatigueFatigue property of the RSW joints were comparatively analyzed. The results revealed that the tensile-shear fatigueFatigue property of the joint with tilting angle 5° was better than that with the tilting angle 0°. For the joint welded with tilting angle 5°, a pullout failure (PF) mode occurred. On the contrary, a partial interfacial failure (PIF) mode produced for the joint welded with tilting angle 0°. In particular, the fatigueFatigue crackCrack did not initiate from the LME cracksCrack, yet came from the notch position between the interface of the two bonded steel sheets. It deemed that the joint welded with the tilting electrodeTilting electrode could produceTensile-shear fatigue property a bigger nugget than that without tilting, obtaining a high tensile-shear fatigueFatigue property.