| 摘要 |
A dual-electrode arc welding apparatus includes a body assembly adapted to be coupled to a source of electric power and directing two wire electrodes through a nozzle assembly to an associated workpiece at a working end of the apparatus. The body assembly is provided at a distal end with an adapter which channels the electrodes respectively through passages of a tip assembly in electrical contact with the adapter and the body assembly for conducting electric power to the electrodes. The tip assembly is removable from the adapter without removing the nozzle assembly and, upon removal of the nozzle assembly, the adapter is removable from the body assembly. The tip assembly may include a single tip body with dual passages therethrough or two discrete tips separately mounted on the adapter by either threaded engagement therewith or by being slidably received in externally threaded nipples and secured by collet nuts. Similarly, the adapter may be collet-mounted or threadedly engaged with the body assembly. Devices both with and without provisions for shielding gas are disclosed and fluid-cooled nozzle assemblies and body assemblies are disclosed. In certain embodiments, the electrodes are powered from separate power sources respectively connected to electrically separated first and second body members of a body assembly. The nozzle assembly may be removably mounted directly on the body assembly or on a docking body which is, in turn, removably mounted on the body assembly.
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