Mechanical properties of a dissimilar aluminum alloy joint welded by hybrid laser–MIG welding

Abstract

Two dissimilar Al alloys, 5083-H111 and 6005A-T6, were joined by hybrid laser–MIG welding method. Mechanical properties of the welded joint were investigated and compared. The results show that the tensile strength of the dissimilar joint is 219.8 MPa, 11.7% higher than that of 6005A-T5 joint. After statistical analysis of the fatigue data, the [Formula: see text]–[Formula: see text]–[Formula: see text] curves of the dissimilar joint were obtained. The mean fatigue strength at [Formula: see text] of the dissimilar joint is 112.5 MPa. The fatigue strength at [Formula: see text] of the dissimilar joint for a given 10% probability of failure, at a confidence level of 95%, is 101.4 MPa. The fatigue strength at [Formula: see text] of the dissimilar joint is almost same as that of the 6005A-T6 joint. In welded structure designing, different [Formula: see text]–[Formula: see text]–[Formula: see text] curves should be chosen according to the different service conditions and reliability requirements.