| 摘要 |
In a MIG arc welding system, a cylindrical docking body having four utilities passages therethrough is mountable in a socket at the welding station. A positioning ring on the body limits the depth of insertion in the socket. Input connectors at one end of the body accept incoming utilities such as consumable wire electrode, shielding gas, welding potential and cooling water. At the other end of the body, the passages for shielding gas and electrode wire communicate with an output fixture, which is internally threaded to receive a contact tip assembly. Plug-type water fittings on a nozzle assembly are receivable in receptacles in the docking body which communicate with the water passages, actuator tips on the fittings actuating normally-closed, spring-biased check valves in the passages to prevent leakage of water from the docking body when the nozzle assembly is demounted. The nozzle assembly is held in place by a coupling nut threadedly engaged with the docking body. There are provided both a fixed-mount embodiment, wherein all utilities but the welding wire enter the docking body radially, and a remote or movable mount embodiment, wherein all utilities enter the docking body axially.
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