Dissimilar metals TIG welding-brazing of aluminum alloy to galvanized steel |
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Authors: | San-bao Lin Jian-ling Song Guang-chao Ma and Chun-li Yang |
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Affiliation: | (1) State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin, 150001, China |
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Abstract: | Dissimilar metals TIG welding-brazing of aluminum alloy to galvanized steel was investigated, and the wettability and spreadability
of aluminum filler metal on the steel surface were analyzed. The resultant joint was characterized in order to determine the
brittle intermetallic compound (IMC) in the interfacial layer, and the mechanical property of the joint was tested. The results
show that the zinc coated layer can improve the wettability and spreadability of liquid aluminum filler metal on the surface
of the steel, and the wetting angle can reach less than 20°. The lap joint has a dual characteristic and can be divided into
a welding part on the aluminum side and a brazing part on the steel side. The interfacial IMC layer in the steel side is about
9.0 μm in thickness, which transfers from (α-Al + FeAl3) in the welded seam side to (Fe2Al5+ FeAl2) and (FeAl2+ FeAl) in the steel side. The crystal grain of the welded seam is obviously larger in size in the aluminum side. The local
incomplete brazing is found at the root of the lap joint, which weakens the property of the joint. The fracture of the joint
occurs at the root and the average tensile strength reaches 90 MPa. |
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Keywords: | aluminum alloy/galvanized steel TIG welding-brazing intermetallic compound microstructure mechanical property |
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