Abstract: A bolt feed device for feeding a welding bolt to a welding section of a welder is installed separately from an electrode. The device includes a feed device body holding an end portion of a welding bolt feed pipe; a feed rod installed for movement forward or rearward relative to the feed device body; a bolt grasping section having a bolt receptacle and installed to the feed rod so that when the feed rod is at a retreat position the bolt receptacle is positioned at a lower end portion of the feed pipe, and when it is at an advance position the bolt receptacle is positioned at the welding section; and an inserting device having a welding bolt inserting cylinder and installed to the feed rod so that when the feed rod is at the retreat position the welding bolt inserting cylinder is positioned at a lateral side of the feed pipe, and when it is at the advance position the welding bolt inserting cylinder is rotated and positioned onto the bolt receptacle of the bolt grasping section.

Abstract: This feed system comprises: feed device for feeding a part to be welded, which can be inserted into a hole of a work, to the vicinity of an electrode of a welder; chuck for removably chucking the part fed by the feed means; first transfer device for transferring the trailing end of the feed device to and from the chuck; a guide pin held capable of being transferred by the electrode for being inserted into the work when the work is to be positioned; second transfer device connected to the chuck for positioning the part, which is chucked by the chuck, concentrically of the guide pin of the electrode; and pusher transferred by the second transfer device for pushing the part, which is chucked concentrically of the guide pin by the chuck, to insert the part into the hole of the work.