Hello good day, Let's see, one thing is the construction technology of a team and another very different thing is the welding process which develops a team. By this I want to tell you that an inverter technology team can weld the MMA (electrode), MAG MIG, TIG, Submerged Arc, etc. process. Or two or more processes according to your design. A source for MMA welding is a constant current source. If you set it to 80 A it has to supply the 80 A both when you start the electrode and when you are finishing it, regardless of the voltage. A source for MIG process is a constant voltage source. You control the current with the amount of wire supplied, m / min of wire given by the speed of the winding motor. Now considering your question, it is feasible to do YES. You have to modify the driver that controls the transistors. But it is not a task that is convenient in economic terms to do, unless you have the team diagram, since each team is different and if you have to start to make a complete revelation of the circuit, to see how you approach the reform would take you a long time . I understand that you have the complete mig head (motor, controller board, euro coupling, etc.) and the mig torch, I recommend that you sell and buy equipment already designed for this function. Now running from the purely economic level and you want to make the modification, you have the full disclosure of the plates and I indicate that you have to modify and add. Regards..