Question on MIG welder

I have been useing a Kemppi Kempomat 150 for more than 25 years and never had any trouble with it. It is a 220volt (over here 220 is standard singlephase household current). It is a really good welder but I would go with a 380volt 3-phase if possible. I myself is planning on buying a bigger machine but as I am thrifty (cheap my friends call it) I´m looking for a used industrial welder. I´m going to several auctions for "out of business" or bankruptcy sales to try and find one.