PURPOSE: To provide a titled welding which permits easy exchange of bombs in welding using a bomb gas by providing a bomb chamber into and from which bombs can be put to the side face of a power source chamber and fitting the mouthpiece of each bomb and the mouthpiece of piping by means of one touch joints.

CONSTITUTION: A bomb chamber 2 into and from which bombs can be freely put is provided to the side face of a power source chamber 1 for electric welding using a shielding gas. A one touch type socket 29 is attached to a mouthpiece 19 of the bomb and a joint plug 22 is attached to the mouthpiece 22 at the top end of the pipe 23 attached to the piping 13 of the chamber 2. The socket and plug are fitted to each other by one touch to communicate the bomb and the piping with each other. If a stop ring is shifted and pulled in the stage of removing the bomb, a stop valve is actuated automatically and the bomb is thereafter removed as desired. The handling of the welding device is made extremely simple.