Abstract
Because there are great differences in physicochemical properties and mechanical properties between Al alloy and steel, their joining with high quality and high efficiency is one of difficult problems in study of welding technology. According to their difference in melting point, the brazing-fusion welding technology of Al alloy to steel was developed based on MIG welding. In pulsed MIG arc brazing-fusion welding process, the molten filler metal and Al alloy base metal will form the fusion welded joint, and will form the brazed joint together with unmelted steel plate, which can efficiently prevent the intermetallic compounds (IMCs) from the formation. With the digital pulsed MIG arc welding machine, the brazing-fusion welding of 6013-T4 Al alloy plate to galvanized steel plate was realized with the filler metal of ER4043, and the effect of welding heat input on microstructures and properties of the joint was studied. The results showed that there is a zinc-rich zone in the weld toe of fusion weld in the brazed-fusion welded joint, which is composed of Zn-Al eutectic, Al-rich � solid solutions and Fe3Al. Fe-Al IMCs layer on the brazed interface is 1.05—4.50 µm in thickness and become thicker with the welding heat input being increased. Fe-Al IMCs with sawtooth or tongue shape grow towards the weld, which mainly includes FeAl2, Fe2Al5 and Fe4Al13. With the welding heat input
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