Abstract: The characteristics of metal transfer,arc phenomena and shapes of weld in DCRP PC-MAG welding with pulsed rotating-spray mode are studied in this paper.It is indicated that if the choosed peak value of pulsed current is higher than the transition current(critical current) of continuous rotating spray transfer,the characteristics of metal transfer may change from pulsed axial streaming transfer to pulsed rotating-spray transfer with the continuous increase of pulse energy,simultaneously, the changes in are phenomena and shapes of weld will take place also,for example,weld width and wire feed speed will increas suddeuly.