Joint Characteristics and Corrosion Properties of Bypass-Current Double-Sided Arc-Welded Aluminum 6061 Alloy with Al–Si Filler Metal

Abstract

Sheets of aluminum 6061 alloy were welded using bypass-current double-sided arc welding with Al-Si filler wire to investigate the effect of Al-Si intermetallic compounds on the microstructure, microhardness and corrosion behavior of weld joint. Experimental results indicated that the Al 4.5 FeSi phase in the topside of the weld joint was finer than that in the backside and newly formed phase of Al 0.5 Fe 3 Si 0.5 was observed in the backside. The formation of reinforcing phases of Al-Fe-Si in the weld improved the microhardness of the weld by about 18%. The corrosion resistance of the weld zone was greater than that of the base metal, while the corrosion current displayed opposite, and the corrosion resistance of the weld region was better than that of the base metal.

Solid-State Diffusion Bonding of NbSS/Nb5Si3 Composite Using Ni/Al and Ti/Al Nanolayers

“…However, as a brittle intermetallic compound, AlNi 2 Ti phase exhibited a hardness of 14.1 GPa [28]. Based on previous studies [34][35][36], this brittle intermetallic compound could severely impair the performance of the joints. Figure 7 shows the backscattered electron images of Nb SS / Nb 5 Si 3 joints bonded with Ti/Al nanolayer.…”

Microstructural evolution and enhanced properties by multi-directional forging of 6201 aluminum alloy

“…The alloy is mainly composed of α-Al matrix defined as point A, the long flake white phase Al 0.5 Fe 3 Si 0.5 defined as point B and the spherical black phase Mg 2 Si defined as point C. According to the relevant research, Mg 2 Si is an intermetallic compound, which plays a key role in improving the alloy strength. While Al 0.5 Fe 3 Si 0.5 is a compound produced by chemical reaction, which is unfavorable to the mechanical properties of the alloy in as-cast state [20][21][22][23][24].…”