A transverse magnetic field generator combined with high-speed hot-wire tungsten inert gas welding system is used to generate an external magnetic force to adjust the molten pool behaviours and the arc. Owing to the forward external magnetic force is helpful to balance the backward arc shear stress and the stirring of the electromagnetic force on molten pool, the weld formation and joint microstructure are improved, and the corrosion resistance of the joint is increased. The test results show that only a low level of assisted transverse magnetic field (3–5 mT) is able to significantly improve the weld formation, to refine and homogenise the microstructure, and to improve the electrochemical and atmospheric corrosion resistances of welded joints.
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