The TIG welding apparatus of the present invention comprises a unit main body 10 in the form of a unit having a DC type welding power source circuit, a control circuit and various driving circuits, And a welding head 12 for performing TIG welding on the welded portion of the base material on the component support S in a touch start manner. In the welding head 12, the elevation driving portion of the elevation tower 30 is provided with a lift- And the torch 22 and the clamp electrode 24 are removably attached to the rectilinear driving member 34 in such a manner that the torch 22 and the clamp electrode 24 are integrally movable in the vertical direction. The arc welding which is performed by holding the two members (base material) with clamps can be performed with high quality and stability.
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