Investigation on the Microstructure and Mechanical Properties of Multi-layer and Multi-pass Al Alloy Deposition Based on Cold Metal Transfer Technology

Abstract

In this work, multi-layer and multi-pass 5183 Al alloy laminated parts were effectively prepared by a cold metal transfer arc welding machine and 5183 Al alloy wire, and the effects of thermal history on the microstructure and properties of multi-layer and multi-pass 5183 Al alloy laminated parts in vertical and horizontal directions were studied. The results showed that few large pores with low porosity were present in the multi-layer and multi-pass 5183 Al alloy forming parts. The pores, small and evenly distributed, existed between the remelting zone and the sedimentary layer. Further, rod-like second phase and the flake-like second phase were the crystal structure of Al₆Mn, and both of them belonged to the Al₆Mn phase. The yield strength and tensile strength of the vertical sample was 125.585 and 286.293 MPa, respectively, while for the horizontal sample, these were 122.532 and 280.02 6 MPa, respectively. The fracture elongation of the vertical specimen was 20.709% and of the horizontal specimen was 25.369%.