Effect of zinc on the fracture behavior of galvanized steel/6061 aluminum alloy by laser brazing

Zhang, P. and Shi, H. and Tian, Y. and Yu, Z. and Wu, D. (2021) Effect of zinc on the fracture behavior of galvanized steel/6061 aluminum alloy by laser brazing. Welding in the World, 65. 13–22.

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Abstract

The galvanized steel with thickness of 2 mm was joined to 6061 with thickness of 2 mm by laser fusion-brazing process. The filler wire was AlSi5 and wire feed speeds were 2.8, 3.0, and 3.2 m/min, respectively. Microstructure and mechanical properties of the joints were investigated. The Zn-rich zone formed in the area of the seam toe was analyzed by means of optical microscope, scanning electron microscope, and energy-dispersive spectroscopy. Meanwhile, the Fe2Al5Zn0.4phase、Fe(Al,Si)0.5 phase, and Fe(Al,Si)0.7 phase were found at the galvanized steel/brazed metal interface along the weld seam. According to tensile test, the strength of the joints was 31.6 MPa (wire feed speed is 2.8 m/min), 61.4 MPa (3.0 m/min), and 70.4 MPa (3.5 m/min), the failure occurred in interfacial layer at the bottom of the joint.