Study of semi-automatic TIG welding

Abstract

Manual TIG arc welding method is a difficult operation for skill working, because it is necessary to operate adjusting heat source and adding filler rod in getting on well with molten condition of the base metal. Accordingly, a semi-automatic TIG welding method becomes valid for a settlement to this problem. Because, in this process, suitable welding procedures and welding conditions are unknown, so in this paper,these matter are investigated. Main results are as follows ; 1) Suitable wire feeding conditions are obtained to adjust continuous transfer of wire molten metal. In this case, the favorable wire feeding position is at the tip end of molten pool. 2) Wire feeding angle has a impact to the formation of penetration bead in one-side welding. In overhead position welding, the fine convex penetration bead can be formed with about 45 degree of wire feeding angle. 3) The semi-automatic TIG welding system in which a wire feeding nozzle is separated from welding torch is favorable, because it is capable of changing wire feeding position and intermitting of welding operation.