A one-sided spot-welding apparatus of the present invention comprises a gun body, comprising: an upper body, which on one end of an arm of a robot is arranged, and a lower hollow body, which is at a lower part of the upper body is arranged; a power supply part, the inside of the lower body is arranged; a welding electrodes part, the i) on an underside of the lower body is arranged, of the ii) with welding current is supplied from the current supply circuit, and of the iii) is arranged to perspiration, base metals, by electrical resistance welding to welding together; a supply portion for a coated metal strip, the a coated metal band between the sweat base metal and the welding electrode; and a mass electrodes part, which is electrically connected with the current supply circuit and on the other bottom side of the lower body for making contact with the sweat base metal is arranged.
展开▼
