Miller Econo Twin HF

I just picked up a used Miller Econo Twin HF (not econo tig) welder yesterday. It is my first tig and I was looking for something inexpensive to cut me teeth on. I paid $150 for it with a full 80cf full argon bottle and cart, but no torch. The serial number tells me it was made in 1979.

I have some questions about this I was hoping to get info on.

I bought it without being able to power it up. I measured the transformers to make sure nothing was burned out. I took the cover off and apart from a kluge repair on one of the cables leading to the electrode terminal, nothing looked fried. I want to clean it up before I fire it up. Some of the connection lugs look a little corroded. Does it make sense to take each one apart and clean the connection, or should I just leave it alone.

This unit varies the output current with a linking coil that slides in and out of the main transformer using a hand crank. The foot pedal only turns the HF on and off. Can anyone tell me how a modern transformer based welder varies its output current electrically? I'm pretty handy with electronics and was wondering if it would be a practical retro-fit for this machine.

Thanks Mike M.

Reply to
Loading thread data ...

PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.