Micro-Structure and Properties of Aluminum Alloy Made by Arc Additive of Al-Si Alloy

The silicon element can increase the fluidity of the molten metal and the corrosion resistance of the welding wire in the welding process. The components formed by the accumulation of aluminum alloy wire with different silicon content have different micro-structure and properties. By using TIG welding method and taking ER4043 and ER4047 welding wire as the research object, multi-layer fuses stacking test was carried out on 4043 aluminum alloy substrate. Comparing the micro-structure and mechanical properties of two different welding wire additions, it was found that the grain size and lattice type of 4047 micro-structure were more uniform, and the α-Al phase and Al-Si eutectic phase were mainly formed. In the 4043 micro-structure, α-Al and Al-Si eutectic forms mainly columnar crystals and a small number of reticular crystals. The average tensile strength of 4047 is 35.91 MPa higher than that of 4043. The average fracture elongation of 4047 print specimen is 6.72% lower than that of 4043 print specimen. The test shows that the tensile strength of 4047 arc additive is higher than that of 4043 arc additive, but the shape of the component is decreased.