WELDING GUN AND RESISTANCE WELDING DEVICE

To provide a welding gun which can efficiently cool heat generated in the time of welding even with a shank in which a distance between an electrode tip and a tip portion of a shank holder becomes long and a resistance welding device having the welding gun.SOLUTION: A third portion 71a on the tip side relative to a spot where a waterproof seal 80 is arranged in portions stored in a shank 15 of a shank holder 71 is formed in a small diameter so as to be apart from an inner wall of a recess 15c of the shank 15, a cylindrical first space 81 is formed between the third portion 71a and the inner wall of the recess 15c of the shank 15, and the first space 81 is made to communicate to a tip portion of a first channel 73 through four communication paths 71g, 71h, 71i, 71j. A notch is formed on the tip portion of the third portion 71a and arranged such that the tip of a flexible tube 74 comes into a second space 82 obtained by the notch, and the second space 82 is made to communicate to the first space 81 by the notch.SELECTED DRAWING: Figure 4 【課題】電極チップとシャンクホルダの先端部分との間の距離が長くなるシャンクでも溶接時に生じる熱を効率良く冷却することができる溶接ガン及び該溶接ガンを備える抵抗溶接装置を提供する。【解決手段】シャンクホルダ７１のシャンク１５に収容する部分のうち、防水用のシール８０を配設する箇所より先端側の第３部分７１ａを、シャンク１５の凹部１５ｃの内壁から離間するように小径に形成して、第３部分７１ａとシャンク１５の凹部１５ｃの内壁との間で円筒形の第１空間８１を形成し、この第１空間８１に対して、４個の連通路７１ｇ，７１ｈ，７１ｉ，７１ｊを通して第１流路７３の先端部分に繋ぐ。また、第３部分７１ａの先端部分に切り欠きを形成し、切り欠きにより得られる第２空間８２内にフレキシブルチューブ７４の先端が来るように配置する。また、切り欠きにて第２空間８２を第１空間８１に繋げる。【選択図】 図４