Fiber laser butt joining of aluminum to steel using welding-brazing method
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Butt joining of aluminum alloy to steel of 2.5 mm thickness was conducted by a 10-kW fiber laser with ER4043 filler metal. A sound joint with excellent front and back formation was obtained after treating the steel with an electro-galvanizing process. The zinc coating could markedly improve the wetting of weld metal on the bevel surface of the steel. Zinc-rich regions which were mainly composed of Al matrix and Al-Zn eutectic at the grain boundaries were formed. The brazing interface consisted of Fe2Al5 layer close to the steel and the FeAl3 layer adjacent to the weld metal. The weld metal was composed of α-Al solid solutions and Al-Si near eutectic phases. The mechanical strength of the joint depended on the area of the brazing interface. Maximum tensile strengths of 174.64 and 130.19 MPa were obtained for the joint with a bevel angle of 30° and 45°, respectively. The fracture surface presented a typical cleavage fracture mode. All the joints failed in the Fe2Al5 layer.
KeywordsFiber laser welding Al/steel butt joint Weld appearance Microstructure Tensile strength
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