Effects of welding conditions on weld geometry parameters for triple-electrode high-speed CO_2 fillet welding on double sides

In order to improve the welding efficiency, tripleelectrode high-speed CO₂ fillet welding process was adopted based on the twin-electrode CO₂ welding, and the effect of welding conditions on weld geometry parameters was analyzed.The results show that weld geometry parameters are more or less the same by DCEP/DCEN/DCEP and DCEN/DCEP/DCEN polarities.Leg length, penetration and weld width increase with the speed slowdown and welding combination parameters increase, but leg length has a maximum limit.Middle-electrode offset plays an important role in welding geometry parameters, and the leg length is the smallest when the electrodes shift from one side to the other side is ±30mm in this experiments.In addition, the leg length and weld width gradually decrease with increasing the distance of wire to wire.