Research on Riveting-laser Arc Welding Hybrid Joining Mechanism of Aluminum Alloy and High Strength Steel

doi:10.3901/JME.2020.06.057

Abstract

Abstract: In order to realize the high quality joining of 6061 aluminum alloy and Q460 high-strength steel, the lap welding experiments are carried out on 6061 Al alloy plates and Q460 steel plates which had been pre-joined by multistep rivets by laser induced arc hybrid welding source. The mechanical properties and fracture modes of the hybrid joints are analyzed. In addition, the macroscopic and microscopic morphologies of cross-section of joint are also explored. The results show that the hybrid joint is composed of three loading bear parts under the actions of steel rivet and hybrid welding source, which are respectively the butt joint formed by steel plate and rivet, the Al-steel joint formed by steel plate, rivet and Al alloy plate, and the Al-Fe interface formed by rivet sidewalls and Al alloy plate sidewalls. The intermetallic compounds in Al-steel joint are mainly Fe-rich Fe₃Al phase and FeAl phase. The hybrid joint had a tensile shear load of 6.2 kN under the optimal parameters. There are three different fracture modes after tensile shear tests：button-type fracture mode, steel base-metal fracture mode and pull-out fracture mode. The latter two show a higher toughness and plasticity. The interaction between stepped rivet and laser-arc hybrid welding source enable a high quality joining between Al alloy and high-strength steel.

Key words: high-strength steel, aluminum alloy, rivet, hybrid welding, mechanics, interface

CLC Number:

TG457

HAN Ruibo, WANG Hongyang, YANG Fan, LIU Liming, ZHU Meili. Research on Riveting-laser Arc Welding Hybrid Joining Mechanism of Aluminum Alloy and High Strength Steel[J]. Journal of Mechanical Engineering, 2020, 56(6): 57-64.

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