If you've already killed 6 igbts maybe you should stick a scope on the gates and see if you're not getting a transient going negative there when it is switching off. In my experience with mosfets and igbts, they are very robust unless you allow the gates to go negative. Maybe some proper reversed d...

If you can buy an "asian" AC/DC TIG unit with pulse, that has some sort of technical support and repair manuals available, it can be a good buy. Leads are usually a bit on the thin side, a lot of folks upgrade the AC cable into the machine with decent 15 AMP(240VAC) cable. MIne was OK. Her...

Monger,
you are correct, i originally designed it to use with a pump,
in a hurry to finish 6mm square project, I tried the garden hose total loss system and it seemed to work OK

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HI ACE, Nice thread on scope and nice beads. Was wondering where you connected onto welder as I need to do this to continue my repair on my 200AMP ac/dc/PULSE Digital TIG. alupulse 200D.jpg 2 IGBTs let go and a gate resistor ,also both bridge rectifiers. Got it going did a bit of welding (DC SS 80 a...

5mm aluminium square with 4mm brackets starting to get a bit too hot using my WP17 aircooled.
So built a garden hose water cooler, bought a WP20 torch with 8m lead and all good now.



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Hi, did some TIG in my training 30 years ago, was always proficient at oxy/acetylene Finally can afford a decent TIG machine AC/DC pulse, actually got 2 machines now as i bought both faulty and fixed myself. My profession is as an Avionics Tech, but also trained as an aircraft mechanic so have some ...