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I have a Hobart TG 301 Tig welder. Used it for a number of years but it sat idle unused for 20 years. When I tried to use it recently, I have no high frequency at the torch. Every thing else seems to work fine. I have arcs between the contact for the high freq with the switch set to start or continuous, but am not receiving anything at the torch end. Kind of limits my Tig welding. I have a parts list with exploded view drawings but no schematic.

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Posted on Jan 02, 2017

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SOURCE: bad tig weld job

Wow you have a lot of variables here. Let's go over some of them.1.AC current 2.100%argon shield gas 3.Check your Tungsten, it must be the recommended 1or 2% and the right size, clean and the tip rounded by meting 4. High freq. turned to continous-not just "START"
5. CLEAN,CLEAN,CLEAN your Alum. with a S.S. brush that has touched NOTHING else in in it's life!
Start here and GOOD luck

Posted on Dec 28, 2008

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SOURCE: LINDE HDA 300 TIG WELDER HIGH FREQ. PROBLEMS

The contact should have a gap .008 .

Posted on Mar 21, 2009

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SOURCE: Hi, starts to weld fine after a few seconds hi

It sounds like you need to change out your SCR chip on your motherboard; Miller makes one that i have installed on all our 350xl's, I don't have the number on hand but i can get it for you tomorrow.

Posted on Oct 20, 2009

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