Abstract Laser-metal inert gas (MIG) hybrid welding-brazing was adopted to achieve a dissimilar metal butt joint of 6061-T6 aluminum alloy and 304 stainless steel. The effect that laser power and welding speed had upon the wettability, intermetallic compound (IMC) layer microstructure and tensile strength of the joint with and without reinforcement was investigated. The results show that the spreading width of the molten metals on both sides of the steel increased with welding heat input, where the maximum spreading width on both sides of the steel was 5.7 and 4.8 mm respectively for a welding speed of 5 mm/s and a laser power of 1000 W. The total thickness of the IMC layer increased and its morphology varied with increasing heat input. The maximum tensile strength of the joint without reinforcement was improved to 180 MPa with a welding speed of 5 mm/s and a laser power of 1000 W, which was attributed to the fact that the transformation of Fe4Al13 morphology reduced the stress concentration in this layer. The tensile strength of the joint with reinforcement was up to 200 MPa (70% of the 6061-T6 tensile strength). The fracture occurred at the heat-affected zone of the 6061-T6 aluminum alloy.

中文翻译：

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热输入对激光-金属惰性气体混合焊-钎焊铝/钢对接接头润湿性、界面组织和性能的影响

摘要 采用激光-金属惰性气体（MIG）复合焊-钎焊实现6061-T6铝合金和304不锈钢异种金属对接。研究了激光功率和焊接速度对有和无增强接头的润湿性、金属间化合物 (IMC) 层微观结构和抗拉强度的影响。结果表明，随着焊接热输入的增加，钢液两侧金属液的铺展宽度增大，焊接速度为5 mm/s时，钢材两侧的最大铺展宽度分别为5.7和4.8 mm。 1000 W 的激光功率。IMC 层的总厚度增加，其形态随着热输入的增加而变化。在焊接速度为5 mm/s、激光功率为1000 W的情况下，无筋接头的最大抗拉强度提高到180 MPa，这是由于Fe4Al13形貌的转变减少了该层的应力集中. 加筋接头的抗拉强度高达200 MPa（6061-T6抗拉强度的70%）。断裂发生在6061-T6铝合金的热影响区。