Abstract
External magnetic field was utilized to enhance laser welded joint properties of AZ31B magnesium alloy to DP590 dual-phase steel based on the joint structure with adding Sn powder prefabricated concave groove. The influence mechanism of external magnetic field on the plasma behavior of metal vapor, shape and size of grain in molten pool and improvement of joint performance were also revealed. The results suggested that the changes of joint property were closely related to the thermoelectric magnetic force (TEMF) generated by the interaction of metal vapor plasma and thermal current in molten pool. External magnetic field suppressed the shielding effect of metal vapor plasma on laser energy, increasing the absorption rate of laser energy, and the “bi-directional” metallurgical bonding of magnesium/steel interface was achieved. Simultaneously, grain size and distribution morphology were also reasonably controlled, hence, the mechanical performance of magnesium/steel joint was significantly improved by magnetic field.
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