Car alternators for welding power source ?

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Is it theoretically possible to build a serious welder generator using multiple car alternators?Why? Well they are cheap as chips and so are small engines, while welding generators are very expensive. I have multiple small engines and alternators in my junk pile right here.  How would amps output be regulated?How would you achieve a serious OCV?
Reply:The first issue is most car alternators only put out about 60 amps max intermittent duty.There are some engine mounted alternators designed for welding but they are very expensive andstill don't do that great a job.The off road guys know all about this.
Reply:I think you could make this work; I have contemplated making not so much a welder but a homemade generator. I would think that with an Ambulance alternator, a battery bank, and a large inverter you could do it. However, with the cost of all of that, a prebuilt generator might do you better.Something like this:But bigger.
Reply:I saw one that works pretty well. No idea how long it might last.www.urkafarms.com