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Scratch start
Posted: Thu Jun 19, 2014 2:44 pm
by Zach_T
What all metals can you weld with scratch start?
Re: Scratch start
Posted: Thu Jun 19, 2014 3:47 pm
by gamble
Any of them with an inverter machine.
Re: Scratch start
Posted: Sun Jun 22, 2014 11:08 am
by Louie1961
True scratch start without high frequency? Only steel and stainless steel. You can't weld aluminum unless you add AC and high frequency.
Re: Scratch start
Posted: Sun Jun 22, 2014 12:59 pm
by GlenC
Check Jody's videos... With my "old" Miller Econo-Twin HF, it's a "scratch start" TIG or with the HF remote switch, it has HF start... It's AC/DC and HF through a spark generator. Later came the Econo-TIG, some have been using the Thunderbolt and adding a HF unit for aluminum...
Re: Scratch start
Posted: Mon Jun 23, 2014 1:23 pm
by gamble
Louie1961 wrote:True scratch start without high frequency? Only steel and stainless steel. You can't weld aluminum unless you add AC and high frequency.
Wrong. You can scratch start on aluminum with an inverter without HF.
With a transformer machine you need HF to get past the 0 point or the arc will go out. Not with an inverter with square wave.