Abstract
In this paper, we presented joining of galvanized steel/aluminum alloy dissimilar metals using magnetic field assisted laser welding. Influence of magnetic field on weld appearance and microstructural evolution were carefully characterized using an optical microscope, scanning electron microscope and X-Ray Diffraction. The results showed that a joint with good weld quality can be achieved by magnetic field assisted laser welding. The microstructure and element distribution at interface can be effectively improved by the magnetic field effect. The interface layer mainly involved Fe2Al5 phase, FeAl3 phase, Al192.4Fe46.22 phase and a limited amount of FeAl phase and Fe3Al phase. More Fe-rich IMCs (intermetallic compounds) with better ductility and toughness can be formed, which can obviously reduce the susceptibility of hot cracking and improve the shear strength of joints. It was also found that the weld geometric features were closely associated with magnetic field variables. A method was proposed to control formation of IMCs at interface and inhibit the crack growth via adding proper magnetic field during the process of laser welding.
Published Version
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