Abstract
Tungsten inert gas weld brazing with twin hot wire technique was employed to create sound joints between aluminum alloy and stainless steel using ER1100 and ER2319 filler, respectively. The interfacial intermetallic compound (IMC) consisted of θ-(Fe,Cu)4Al13 and minor Cr0.7Fe0.3Al6, and the precipitate phase in the weld was Al2Cu with ER2319 filler. The interfacial IMC was mainly θ-Fe4Al13, and the precipitate phase was FeAl6 with ER1100 filler. The results of mechanical tests suggested that the joint with ER2319 had a higher tensile strength of 283 MPa but more brittle, while the joint with ER1100 exhibited better comprehensive mechanical properties. The joint properties are determined by both interfacial IMCs and precipitate phases in the welded seams. Different ways of controlling the IMCs should be adopted to inhibit the IMC growth by declining the heat input with ER2319 filler and promote the IMC dissolution by adjusting the welding procedures with ER1100 filler.
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