0 Anonymous Asked: August 17, 2020In: Business Why is TIG welding a constant current welding operation and MIG welding is a constant voltage welding operation? 0 welding machine manufacturers in india welding Share Facebook 1 Answer Voted Oldest Recent Rakesh 10 Questions 51 Answers 0 Best Answers 129 Points View Profile Rakesh Added an answer on August 17, 2020 at 12:05 am TIG or GTAW works similarly to SMAW or sticks welding, except that it uses a non-consumable electrode rather than a welding consumables, the tungsten. My current or amperage setting will determine how many electrons are moving across the arc for a given time, but as I do welding, the voltage fluctuates as my torch moves closer or further away from the work. (Yes, I know the amperage does too, but to keep things simple for the explanation, let’s imagine the current is completely constant). When the stick or TIG welding, when no arc is struck there is OCV, which is higher to help establish the arc, around 90 volts. Once you establish an arc it can drop and fluctuate between 13 and 20 volts, given or taken. 0 Reply Share Share Share on Facebook Share on Twitter Share on LinkedIn Share on WhatsApp Leave an answerCancel replyYou must login or register to add a new answer.