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Can't help you on the STT thing. As far as using them for light fab work, the only problem you're going to have is power consumption. Most of these big unit have a high idle current draw. Aside from that, you should have no problems. Just be absolutely sure to double check all the electrical connections and voltage ratings of the machines. Some of these are set up for european voltages like 300v and 575v They will not work properly on 240v or 480v systems and could be a serious hazard. If your voltages and connections are correct, be sure to size the wire and fuses properly. The DeltaWeld machine is likely capable of drawing upwards of 65 amps when operated on 230v 3ph. As long as you got the right voltage, wire and fuses, you should have no problem using them for whatever. BTW, as per Miller Electric, all welding machines should be fuse protected, not circuit breakers. You can call 800-4-A-MILLER or by the numbers (800) 426-4553 and ask for "Tech Services". They will tell you exactly what fuse size and type to use for the specific machine. Just went through this with the new XMT-304 I got.....what a great machine this baby is!!!!! !! WOW!!!!!
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