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The TIG torch is usually controlled by a foot pedal, which can be tricky when trying to work up on top or underneath your truck or chassis. Check out this shot where Drew is welding and using his knee to control the foot pedal since he had to squat down under the chassis. As with anything, welding gets easier with practice, and TIG-which necessitates using both hands and one foot or knee-requires a lot of practice to master.