Study for TIG-MIG Hybrid Welding Process

On TIG-MIG hybrid welding process, the MIG arc can keep stability even in pure inert shielding gas by the effect of hybridization with TIG arc and it becomes possible to achieve the both merits of high quality as well as TIG and high efficiency as well as MIG. In this report, we considered about optimum torch configuration on this process for practical application. As a result, following findings were obtained: (1) More than +45 degree MIG torch angle is needed to keep forehead angle of MIG arc under condition that quite large repulsion occurs. (2) Although there is not seen deciding difference for bead shape and penetration by the change of torch angle, TIG 0 degree /MIG+45 degree is the best configuration relatively for the penetration shape and flatness of bead shape. (3) Based on the consideration, original torch for TIG-MIG hybrid welding process was produced and it was confirmed the good weldability on practical joint.