Converting MIG to TIG

[KemppiFrog]

This is not entirely disconnected with my other thread on AllY DC...

While welding some work tables for some one's atelier/workshop, I was musing on the idea of the possibility of using my MIG as a TIG.
If one switched the polarity, turned off the wire feed and fiddled with a TIG torch (which I have) to get the gas connection right, would there be any problem with using it as a power source? It has continuous power regulation rather than stepped and has never called time on any duty cycle, despite the fact I usually run it at max power (150 amp)

Any thoughts from the panel?
KF

 

[GrahamGKD]

There was a recent thread on this but I can't find it - here is an older thread though. From memory, the answer in the more recent thread was much the same.

 

[MCKDAVID]

I looked into this a few years ago, long story short, got the same answer, current versus voltage, came to the conclusion, no, forget it so went to the pub instead......

 

[rikrobson]

why not get a dc inverter that does tig?

 

[KemppiFrog]

why not get a dc inverter that does tig?

I had one, went 'pop', that is why I have the TIG torch and other bits. I was just musing on the possibilities of using the MIG for the rare occasions I need TIG.
KF

 

[Mr shiney]

I have a multi mode thermal arc unit that does MIG, TIG and stick by changing the leads etc.

 

[amron]

KF - if that would've been possible - life could have been better. Mig works in constant voltage mode and Tig in constant current mode. your Mig's open voltage output is ca.25V and the Tig/Arc welder open voltage is higher, so the outcome of this is that they are not compatible. there are some adapters but as far as I know- aren't very successful. if you have an arc welder with DC output - you can connect the Tig torch to it and scratch start it.
Good luck.