Abstract: To solve the disadvantages of mechanical properties of welded joint made by submerged arc welding(SAW)with high heat input, a new pulsed current SAW technology was put forward.The armor plate of 16MnR as the test material was chosen, and the effect of pulsed SAW by using sharp-fall output characteristics power source and varying-speed wire feeder on the mechanical properties of welded joint was investigated.The results of the experiments show that the pulsed arc force can refine the grain size and decrease the composition segregation of deposited metal by regular stiring and oscillating to welding puddle.The microstructures of welded joint by pulsed SAW can be obviously improved and the mechanical properties of welded joint can be increased.