I use the 240 volt 20 amp outlet mates with nema l14 20p.
Running arc welder off generator.
You strike an arc then have to maintain it really tight while the genny sees the load and revs up.
Stick welding from the generator sucks.
After that it is the same as normal.
You can run a small inverter welder off of a moderately sized generator as they only draw about half the amperage of a comparable transformer based welder.
Http goo gl lzejxl can both transformers and inverters be operated off non clean power generators without.
If you are fortunate to establish an arc the arc will tend to pop out frequently.
To successfully run your ac dc 225 125 welder you would need a minimum of a 15 000 watt ac generator.
The biggest problem i had was adapting the generator to the welder plug.
I would avoid running any of the new computer controlled mig or tig stuff off a normal generator.
The generator is breaker protected.
Weldforce machines by weldclass are specifically developed with generator use in mind and have a high level of protection against voltage fluctuations.