TIG welding-brazing joint of aluminum to stainless steel with hot wire

TIG welding-brazing process with high frequency induction hot wire technology was presented to create joints between 5A06 aluminum alloy and SUS321 stainless steel using ER1100 filler wire with different temperature. The joints were evaluated by mechanical test and microstructural analyses. The welding procedure using hot filler wire (400°C) significantly increases strength stability by 71% and average value of tensile strength by 30.8% of the joints, compared with cold wire. The research of microstructures in interfaces and welded seams reveals that using 400°C hot filler wire can decrease the thickness of intermetallic compounds (IMCs) from 6 to 3.5 μm approximately, which is the main reason of mechanical property improvement.