| 摘要 |
PROBLEM TO BE SOLVED: To solve the problems that in a welding torch for inert gas welding, the guide hole of a contact tip supplying a welding wire to a work, is worn by friction by a welding wire passing through the guide hole and weld precision is consequently deteriorated remarkably, and that if the guide hole is made smaller than a present size to increase the service life of the contact tip, the service life of the contact tip is prolonged, however the transfer of the welding wire with curling tendency remaining on it can not be smoothly performed. SOLUTION: The guide hole having a diameter larger than that of the welding wire is provided along the axial line of a main body having a mounting means at one end and a part convergent in outside diameter at the other end, and the guide hole is formed into an at least two-stepped hole with a supporting part having a diameter slightly smaller near an opening end on the convergent side, and thereby the welding wire is supported by the supporting part shorter than the guide hole. Thus, a strong frictional force caused by the curling tendency is not acted on the supporting part, and wear is reduced.
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