| 摘要 |
An easily replaceable ventilated external insulator for a tungsten inert gas, plasma, or similar welding torch comprises a generally cylindrical member molded from a resilient heat resistant electrical material such as a silicone rubber. The inner wall of the insulator has a plurality of parallel alternating grooves and lands. The grooves communicate at each end with circumferential grooves which act as manifolds. At least one of these circumferential grooves has a vent to release to the atmosphere any gases formed between the insulator and the body of the torch head during welding operations. The vent is located so that these gases are directed away from the weld zone and do not act to contaminate the welding atmospehre.
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