Connection performance of friction element welding between aluminum and high strength steel

In order to find out the difficulty of the bonding between aluminum alloy and high strength steel material, ensured the high quality bonding between them, friction element welding was used to implement the bonding between 6061-T6 aluminum alloy and high strength steel DP1470. By observed the macro morphology and microstructure of the joint, tested the joint mechanical properties and compared the joint failure forms, the variation law of bonding performance of joint obtained by friction element welding was studied. The results show that rotating speed is an important factor affecting the welding quality. During the welding test, the speed control range is 5000−8000 r/min. The tensile strength of the joint will increase at first and then decrease with the increase of the rotating speed. When the rotating speed reaches 7000 r/min, the shear load of the joint can reach 6.3 kN, the surface of the joints are flat without cracks and pores. When the failure mode of the joint is the fracture failure which occurs on the aluminum alloy plates at the joint, the tensile strength of the joint will increase higher and the welding quality will be better. Therefore, aluminum alloy and high strength steel can achieve high-quality joining through friction element welding.