From Newsgroup: sci.engr.joining.welding
I think I've had my SP100 for three decades now. Still works fine, though I don't use it every day. I have CO2 tank/regulator and use .030 wire, and if the settings are correct, there is little spatter. I don't think you can weld over 3/16" unless you preheat. The weld may look good, but it's not going to have penetration. Once I did use it to reinforced a 2" hitch square tube to make it solid steel internally. That worked well, but only because I heated the metal to red hot first with a mapp gas torch. If the steel is red hot before you start the spark, you can do just about anything. That isn't practical for many jobs though.
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