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gas lens and cups

Motorsport TIG Welding Fundamentals

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What length is prescribed in general for tungsten? what starting point meaning for a #5 cup or lens how long should the tungsten be? I understand that the larger the lens the longer the tungsten can be but what is the average starting point for tungsten length?

General rule i have used is stick out should be the diameter of the cup being used. Although on really large gas lense cups i have had success using even more stick out to get proper gas coverage in tight spots

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