A METHOD OF ELECTRIC WELDING BY TRANSFERRED PLASMA ANDA WELDING TORCH FOR CARRYING SAID METHOD INTO EFFECT

摘要

Electric welding with a transferred arc plasma between an electrode and the parts to be welded under electric voltage of arc transfer, applicable to the welding in one single pass of metal sheets edge-to-edge having a welding thickness comprised between 7 and 14 mm., with an electrode disposed axially with respect to a discharge nozzle for supplying the plasma-producing gas, the said nozzle comprising a convergent and then divergent frusto-conical portion, and in which said electrode has a conical extremity adapted to project on the downstream side of the neck of said discharge nozzle, the convergent portion of said nozzle having a convergence angle greater by 10 DEG to 80 DEG and preferably by 20 DEG to 60 DEG than the convergence angle of the conical extremity of said electrode.