Most home generators put out sufficient voltage to run household appliances but for welding you need a lot of current (amps) which portable generators are not designed to produce.As Re-Design said you can use your generator to run a small welder depending on the generators wattage output.
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Use the generator to power a welder.
the amperage that a power generator makes won't be enough to do much. Not to mention there will be about 5 wires comming off the stator for things such as 120, 220, and DC. As far as my knowledge goes.. I would personally just buy a welder
A welding generator/alternator is wound differently from a power generator/alternator. A welder needs high currents at low voltage, a power system high voltages and low currents. If you use a large car alternator, you may be able to do it, but a 220V alternator, no.
What generator? What welding machine? L
Makes me think of an arc welder. Smack metal clamps on the two wires coming from the generator, one to ground, one to hold the welding rod. I heavily doubt if it will have enough strength but it would be a good project to try.