Abstract
Microstructure and mechanical properties of brazed-fusion welded joint of aluminum alloy to galvanized steel were studied by analyzing and comparing the as-welded state and that with preheat treatment at different temperatures. The preheat treatment process not only increased the spreadability of weld seam and thickness of intermetallic compound (IMC) layer at brazed interface but also changed phase composition of IMC layer. In as-welded joint, there were two IMC layers (layer I included θ-Fe4Al13 and τ5-Al8Fe2Si adjacent to weld seam, and layer II was composed of η-Fe2Al5 near the steel side), while a newly formed nanoscale Fe-rich layer III which might consist of FeAl and Fe3Al was found in the joint with preheat treatment, causing by interdiffusion between layer II and Fe at high temperature. Incomplete brazing at weld root deteriorated the strength of as-welded joint. The joint with preheat treatment at 100°C, fractured at heat-affected zone on aluminum alloy side, exhibited the highest strength which reached nearly 80% of that of aluminum alloy. The thicker IMC layer at weld root led to the fracture at brazed interface when preheat treatment at 200°C.
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