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Registered Member #2113
Joined: Wed May 06 2009, 04:15PM
Location: Sacramento, Ca
Posts: 1
Hey everybody, So i've got a project going and wanted to pick some of your brains about one of the problems im facing. I'm working on converting an old stick welder i have sitting around into a TIG welder. I've got most of the workings taken care of but i'm still not sure what to do for the HF supply. For those of you not familiar with it, (modern) Tig welding machines use a high frequency, high voltage power supply for a dual purpose. For running the machine in direct current mode, the HF is used to establish an arc between the workpiece and the electrode tip. Once the arc is started, the main current can maintain it and the HF is turned off. When running the machine in AC, the HF serves both to establish the arc at the start of a weld, but it left on to keep the arc established during the point where the current is changing polarities (called arc stabilization). I'm somewhat familiar with HV electronics and such from when i passed the summers in high school playing around with it but i havent done much with it in the last few years and i'm a little out of practice. I was wondering if you guys had any ideas on what i could do for supplying the HF for the system.
Registered Member #396
Joined: Wed Apr 19 2006, 12:55AM
Location: Pittsburgh, PA
Posts: 176
First of all welcome to the forums. Its recommended that you use the search function at the top of the page before you ask a question so as so see if it has already been discussed. This has been discussed a few times before but "high frequency" and "high voltage" will give you tons of hits so I understand that it would be difficult to find anything. "Arcstarter" is the word you are looking for.
I've made one and discussed it here:
A google search for "high frequency arc starter" will give some good info as well.
I'd be interested to see the rest of this TIG project as I'm doing the same thing myself.
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