Effect of Press Amount on Properties of 7N01 AluminumAlloy Friction Stir Welding Joint

Friction stir welding of 7N01 aluminum alloy was carried out under different press amounts (0.3, 0.7, 1.0 mm). The effects of press amounts on the cross-sectional morphology, tensile properties, anti-tear properties, and fatigue properties of the joint were studied. The results show that the press amount had little effect on the tensile properties of the 7N01 aluminum alloy friction stir welding joint. When the press amount was 0.7, 1.0 mm, respectively, the crack initiation energy, crack propagation energy, and tear strength of the joint were similar. When the press amount was 0.3 mm, the crack initiation energy, crack propagation energy, and tear strength of the weld area of the joint were significantly reduced. The fatigue strength of the welding joint increased with the increase of the press amount. The fatigue properties and crack propagation resistance of the welding joint were the best when the press amount was 1.0 mm.