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.