| 摘要 |
A resistance welding apparatus (10) is disclosed which is particularly adapted for use in welding parts (27) into the interior surface of a metal tube (17) in a pre-determined pattern obtained by longitudinal and rotational indexing of the tube. An elongated electrode arm (20) extends into the tube and has a feed track (35) attached thereto through which the metal pieces (27) to be welded are moved down the length of the electrode arm (20). The other end of the electrode arm (20) is rigidly connected to a mount (21) and is electrically insulated therefrom. At the end of the feed track (35), a lever (61) aligns the lead metal piece so as to be at the same level as an end support (43), and a pusher lug (41) advances the metal piece to the end support (43). A piston (46) carried by the end support and acting against the inside wall of the tube moves the end support (43) transversely of the electrical arm to bring the piece (27) to be welded into pressure contact with the inside of the tube (17). Electrical current is then passed through the electrode arm (20) and the piece to be welded, to the tube (17), and then to a grounded contact (47), to resistance weld the metal piece to the tube (17).
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