Penetration mechanism of aluminum alloy in double-sided GTAW process

来源期刊：中国有色金属学报(英文版)2005年第z2期

论文作者：高洪明 吴林 董红刚

文章页码：35 - 38

Key words：aluminum alloy； double-sided GTAW process； weld penetration； numerical simulation

Abstract: The penetration mechanism of aluminum alloy in double-sided gas tungsten arc welding (GTAW) process was probed by means of theoretical analysis, experimentation and numerical simulation. The results show that, firstly, the welding current goes straight through the weld zone, forms a stronger electromagnetic force field, and causes a stronger fluid flow in the weld pool. Secondly, during double-sided GTAW process, when the weld is partial penetrated, a heat-congregated zone forms between the bottoms of the two weld pools, where the temperature can increase quickly even though only a small amount of heat is input. Thirdly, the buoyancy force causes an inward flow in the bottom weld pool, which can drive the hot liquid on the surface to the bottom of the pool.