Solid-state resistance seam welding of galvanized steel

Abstract

In this paper, solid-state welds, produced by resistance seam welding, are analyzed. The designation solid-state welding is used since no traces of melting can be detected in the nugget of the welds after microstructural analysis. Welds microstructure and morphology suggests the occurrence of hot forging under the pressure exerted by the electrodes. Hardness measurements and transverse tensile tests showed that the welds are in over-match relative to the base material. Mechanical testing also revealed that the performance of the welds in tensile-shear is excellent. However, in order to obtain good quality welds, expulsion of the zinc coating from the faying interface should be insured which requires a careful control of the welding current.