220V the same as 240V?

This might be a dumb question, but I’m new at this. I have a welder/generator gas driven it has 120V and 240V plug outlets. I bought a mig welder that requires 220V to run it. If I pluged it into the 240V on my generator is it going to damage the mig welder? Or is 240V the same as 220V? Also the plug outlet is not a normal one it looks like a upside down L on one of the prong holes..what is the plug type called, I need to get one but dont know what the **** to call it. A “240 plug”??

In the U.S. ‘ 220′ is nominal for either 208 or 240 Volts.
There is no actual 220 Volt. service offered.
(You only find 208 in urban situations where it is derived from
three phase 120′/208V. services.
Most sub-urban and rural services are single phase 120/240V.)

On you generator I suspect that the receptacle is a NEMA 10-30R.
To be sure, take a ‘rubbing of the face of the recptacle to the hardware
shop to find the matching plug.
(The NEMA No. of the receptacle might appear on its face.)

230V light effect, old generator

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