Hey, Ernie. Does that Maxstar have lift-start only? I haven't done much TIG at all and thought you needed HF for use with a foot pedal or your had to scratch start like with Stick. Not true?
Hey, Ernie. Does that Maxstar have lift-start only? I haven't done much TIG at all and thought you needed HF for use with a foot pedal or your had to scratch start like with Stick. Not true?
It's fairly easy to find the specs on the miller site:
Lift start is not the same thing as scratch start in case you didn't understand that. Scratch start is what you do with stick. The current is always on and you have to touch the weld metal with the electrode to start the arc but do it a way to keep it from sticking. You can scratch start TIG but it's tricky because you risk contaminating the weld by melting some of the tungsten into the weld if it sticks.
Lift start is a special electronic control feature built into some machines that keeps the current off (mostly) when not welding. You touch the tungsten to the weld for a second, (no worry about it sticking because the high current is not on - only a very low voltage low current sense current is active). You then lift the tungsten off the metal and that signals the machine to turn on the high current (aka start _after_ lifting) - so the arc starts instantly _after_ you lift the tungsten off the metal preventing (or at least reducing) any problem with it sticking. So you don't scratch it, you simply touch it, and then lift it to start the arc. Lift start is not bad and easy to get used to. And it has the advantage of not creating any HF interference with near by electronic equipment.
There are other machines in the Maxstar line like the Maxstar 200 SD that does HF as well as lift start if you want that (but they cost more):
Or down to their bare-bones TIG only DC/AC inverter the new Diversion 165:
Thanks for the info, Curt. I should have dug a little deeper for the specs. But, I appreciate your very good description of touch-start. I thought it meant the same as scratch start like I've seen with stick machines set up to do TIG.
Thanks again,
rvb
-- As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17
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