Parallel machines?

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I have seen in a few places on here where people have mentioned hooking multiple machines together to increase amperage.  The idea interests me.  I have searched this both here and on the net, and have not found a lot of info.   I also read on miller's page on paralleling and they recommend diode rather then dc brush machines.The only machines I have are some old sa200s.  Can you do it with these, as I do a fair bit of air-arcing, and more amperage is better.  Do they have to be identical machines?  I have a short hood and a red face. Any info would be appreciated, as I know there is a lot of knowledge on this forum.Bruce DeLaetHeavy Equipment Mechanic and Welder1948 SA-200 short hood1949 LincWelder 1801963 SA-200 red faceMiller S-32-P