Investigations on the Dissimilar Metal Joints Capability between Aluminum Alloy and Steel under CMT Welding

Abstract

Sustainable lightweight vehicle design has becoming a key trend in the future. A new way to join aluminum alloys and steel sheet. Cold metal transfer (CMT) welding of thin sheet metal products. Determination of equilibrium wire-feed-speeds welding-speeds and arc length. Seam formation and microstructure of CMT were researched. Not only that, but optimum welding parameters were analyzed. Study of welding joint microstructure of compound layer on welding joint. Comparing the steel side of welding seam. The aluminum alloy siding grain size was larger. After tensile test, joint was fractured on the aluminum alloy side. Warp deformation occurred on aluminum side. Displacement of warp deformation became larger along with the increase of welding current. The results reviewed in this article indicate that the aluminum alloy fractured is more preferable to steel. CMT welding has found applications in automobile industries, defence sectors and power plants as a method of additive manufacturing.