Abstract
Abstract Laser-metal inert-gas (MIG) hybrid welding-brazing was applied to the butt joint of 6061-T6 aluminum alloy and 304 stainless steel. The microstructure and mechanical properties of the joint were studied. An excellent joint-section shape was achieved from good wettability on both sides of the stainless steel. Scanning electron microscopy, energy-dispersive spectroscopy and X-ray diffractometry indicated an intermetallic compound (IMC) layer at the 6061-T6/304 interface. The IMC thickness was controlled to be ∼2 μm, which was attributed to the advantage of the laser-MIG hybrid method. Fe3Al dominated in the IMC layer at the interface between the stainless steel and the back reinforcement. The IMC layer in the remaining regions consisted mainly of Fe4Al13. A thinner IMC layer and better wettability on both sides of the stainless steel were obtained, because of the optimized energy distribution from a combination of a laser beam with a MIG arc. The average tensile strength of the joint with reinforcement using laser-MIG hybrid process was improved to be 174 MPa (60% of the 6061-T6 tensile strength), which was significantly higher than that of the joint by traditional MIG process.
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