Abstract: In the research of the influence of alternative pulsed magnetic field on microstructure and properties of nickel-base alloy, a transverse alternative pulsed magnetic field had been applied to the plasma arc surfacing welding on low carbon steel. The hardness, wear resistance and microstructure of surfacing layer with different pulsed magnetic field currents, duty cycles have been systematically analyzed. The results indicated that transverse alternative pulsed magnetic field can effectively improve the crystal shape of plasma arc surfacing layer, refine crystal grain. Proper pulsed magnetic field current, duty cycle can obtain the optimum effect on electromagnetic stirring, which can increase the amount of hardening phase in overlay deposit, control the growth direction of hardening phase and improve the hardness and wear resistance of the surfacing overlay.