| 摘要 |
A welding apparatus (10) for longitudinally traversing and circumferentially welding within the interior of a tube. A rotating weld tip and gas supplying containing head is mounted on and rotationally driven by a rotor tube (36) extending from the end (90) of a cylindrical housing (12) in which it is mounted. The axially fixed rotor (36) is surrounded by and is driven by a helix drive connection (52,54,56) to a piston (20). The piston (20) reciprocates in a cylindrical bore (14) within the housing (12) in response to selectively applied fluid pressure acting against a spring bias (26). A strain gage (72) on the spring (26) controls the fluid pressure by means of valve ("V") whereby reciprocation of the piston (20) rotates the rotor (36) by means of the helical groove (52) and balls (54). The various parts are hollow to accommodate the necessary wire conductors (70,86) and gas flow. A conductive path between the weld tip (32) and outside source of current is supplied through the conductive rotor (36) a slip ring (19) and wires (86).
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