Effects of Welding Temperature on Microstructure and Tensile Properties of Pressure Welded Joint between Hot Dip Galvanized Steel and Aluminum Alloy

The pressure welding of hot dip galvanized steel sheet and 6061 aluminum sheet was simulated by using thermal simulation machine. The effects of welding temperature（390-490 ℃） on microstructure and tensile properties of the joint were researched; And the composition of interface layer at different welding temperature was analyzed. The results show that the Al-Zn binary compound gradually decreased and Fe-Al intermetallic compound gradually generated in the interface layer and shear force of the joint first decreased and then increased with the increase of welding temperature. When welding temperature was 390 ℃, the interface layer consisted of Al-Zn binary compound, and the joint owned the maximum shear force of 6.45 kN. The shear force decreased to the minimum value which was 4.39 kN at the welding temperature of 430 ℃. When the temperature was above 430 ℃, Al-Zn binary compound in the interface layer disappeared completely, the interface layer was mainly composed of Fe-Al intermetallic compounds, and the shear force of the joint increased again.