Semi-automatic hot wire tig welding equipment

DETAILED DESCRIPTION The present invention has been developed to obviate the above-described disadvantages of the prior art and has as its object the provision of a TIG welding equipment, wherein the wire is automatically fed and welding can be easily performed while the wire feeding guide is held in one hand and a TIG arc torch is held in the other hand.
To this end, the present invention features a semiautomatic hot wire TIG welding equipment comprising: a portable manually held and moved TIG arc torch; a portable filler wire feed torch manually held and movable relative to said TIG arc torch; a hot wire switching power source means for energizing said TIG arc torch, said filler wire feed torch and the base metal; filler wire feeding means for feeding the wire to said wire feed torch at a desired wire feed rate; welding condition control means for controlling said power source means to provide wire heating power commensurate to the wire feed rate; means for measuring the resistance value of the wire extension section between the terminal end of the wire and the terminal end of the filler wire feed torch; and means for controlling said filler wire feeding means to change the wire feed rate in response to the detected wire extension.
According to the present invention, the welding operations are performed while the filler wire feed torch is held in one hand and the TIG arc torch is held in the other hand, so that the position where the arc and the wire are inserted can be desirably adjusted.
Furthermore, the welder can vary an extension of wire to instantly change the wire feed rate, so that welding can be performed in the same feeling as in the manual TIG welding by use of the welding rod.