Formation Mechanism of 6009 Aluminum Alloy Joint by Laser-MIG Arc Hybrid Welding
An investigation of the influence of different position for laser and arc on the formation mechanism of 6009 aluminum alloy joint by laser-MIG arc hybrid Welding was dealt with in this paper. As a result of stronger laser-arc coupling with laser at the front, the formability of joint which was welded with laser at the front is better than that of joint which was welded with arc at the front. Due to mechanical rabbling of arc, the grain size of upper weld is smaller than that of lower weld; There is softening zone in the heat affected zone of hybrid welding joint. In trailing MIG torch arrangement, the hardness of upper joint is less than that of lower joint for tempering of arc. While, the hardness of upper joint for leading MIG torch setup is higher than that of lower joint, owing to the secondary remelting of solidified metal by laser. That second phases at HAZ coarsens and grows has great influence on the mechanical property of the hybrid weld joint. Grooving before welding is beneficial to enhance the mechanical properties of joint. The tensile fracture of hybrid welding joint has typical dimples feature. The formation of dimples is associated with second phase particles.
Keywords6009 aluminum alloys Fiber laser-MIG arc hybrid welding Formation mechanism
This work was supported by of National Natural Science Foundation Project (Grant No. 51774249), The Foundation Sichuan Provincial Department of Education (Grant No. 15ZA0048) and Open Experimental Project In Southwest Petroleum University (Grant No. KSZ14113).
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