Effect of process parameters on microstructure and properties of laser welded joints of aluminum/steel with Ni/Cu interlayer
(1. Anhui Key Laboratory of High-performance Non-ferrous Metals, Anhui Polytechnic University, Wuhu 241000, China;
2. School of Materials Science and Engineering, Harbin Institute of Technology (Weihai), Weihai 264209, China)
2. School of Materials Science and Engineering, Harbin Institute of Technology (Weihai), Weihai 264209, China)
Abstract: The effects of laser parameters and interlayer material on the microstructure and properties of the welded joint between 6061 aluminum alloy and stainless steel were studied. The results show that the density and microstructure of the welded joint can be optimized by changing the laser power with 0.05 mm Cu foil and 0.1 mm Ni foil as interlayer. A large number of new Cu-Al binary phases were found near the aluminum alloy, which effectively inhibited the formation of the binary brittle phase of Fe-Al. The maximum shear force of 1350.96 N was obtained with laser power of 2200 W. The shear force of the welded joint increased to 1754.73 N when the thickness of the Cu foil thickness changed to 0.02 mm.
Key words: laser welding; aluminum/steel dissimilar metals; interlayer; microstructure; mechanical properties