Laser-TIG-adhesive hybrid welding of magnesium to steel with Ni alloy interlayer

Laser-TIG-adhesive hybrid welding was carried out to join AZ61 magnesium alloy to Q235 steel with Ni interlayer. Weld surface appearance,microstructure and distribution of alloying elements in the fusion zone were investigated. The experimental results indicate that the welding heat input was the key factor on the weld surface formation when the thickness of adhesive was constant. The seam was mainly composed of Mg, Fe and Ni. In the fusion zone,the addition of adhesive reinforced the liquidity and promoted the reaction among molten metals. The AZ61 magnesium alloy and steel were metallurgically bonded,and the liner load capacity of the resultant joint increased. The comprehensive performance of the joint was improved.