Question: what is 2t 4t tig?
Answer: Tig welding 2T and 4T, respectively, for the normal mode and semi-automatic mode: 2T: press the trigger (welding) to release the trigger (stop). 4T: press the trigger (start arc)release trigger (welding) and then press the trigger (welding)release the trigger (stop). ... not welding，it can be released directly.