Pulsed TIG Welding–Brazing of Aluminum–Stainless Steel with an Al-Cu Twin Hot Wire
- Shandong University, MOE Key Laboratory for Liquid–Solid Evolution and Materials Processing, Institute of Materials Joining (China)
- Harbin Institute of Technology, State Key Laboratory of Advanced Welding and Joining (China)
A TIG welding–brazing process with a twin aluminum hot wire technique was utilized to control the heat input, improve the joint formation, suppress the interfacial intermetallic compounds (IMCs) and increase the joint strength, thereby creating reliable joints between an aluminum alloy and stainless steel with an ER2319 filler. Twin wires with reasonable diameters and filling modes led to a satisfactory weld of parent metals with varying thicknesses. By the hot wire technique, the reasonable range of the welding current was extended and the thickness of the interfacial IMC at the seam bottom was reduced. In addition, both the tensile strength and stability of the joints increased compared with a cold wire. The IMC consisted of θ-(Fe,Cu){sub 4}Al{sub 13} and minor Cr{sub 0.7}Fe{sub 0.3}Al{sub 6}, and the precipitated phases in the weld were Al{sub 2}Cu and Al{sub 2}CuMg. With an increasing welding current, the IMC thickness significantly increased, while the joint strength decreased. The fracture positions of the joints varied with the corresponding welding currents.
- OSTI ID:
- 22970957
- Journal Information:
- Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 2 Vol. 28; ISSN 1059-9495; ISSN JMEPEG
- Country of Publication:
- United States
- Language:
- English
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