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I just bought a Maxstar 150 STH used and the man had never tig welded with this welder and this has 150 STH has built-in gas solenoid, the Maxstar 150 eliminates the need for a bulky TIG torch with a gas valve. I have always used a tig head with gas valve, can someone explain to me when you strike off how do you the gas flow to tungsten before ark . Thanks for any help.