Abstract: In this paper,behaviors of metal transfer and their influence on the weld in pulsed MIG(MAG) welding has been stuided by a new type of pulsed welding power source and high speed camera,The experimental results show that there are various forms of metal transfer,such as one pulse one droplet, one pulse rnulte droplets, multe pulses one droplet.Their volume and transfer speed of droplet and impuct on the puddle are different,and the transfer form has an influenee on the welding prdcess andthe appearanee of weld.Only the way of one pulse one droplet transfering in base current is the optimum for of metal transfer.