Twin spot laser welding characteristics of aluminum alloy

Single spot laser and twin spot laser welding of aluminum alloy, with or without wire feeding, were carried out.The weld appearauce, the thresholds of gap width and spot separation, as well as the states of porosity in weld with various laser welding procedures were compared, and the influences of twin spot laser on welding of aluminum alloy were analyzed.It showed that in contrast to single spot laser welding, twin spot laser welding can improve the weld surface quality, and increase the weld width, the thresholds of gap width and spot separation.Twin spot laser can decrease obviously the large gas pore, but can not decrease the small gas pore.In addition, wire feeding in process of welding can improve weld surface quality and increase thresholds of gap width and spot separation further, but increase large gas pore.Twin spot laser welding with wire feeding can decrease the large gas pore.