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Hi Joe, Really nothing special about the process. Normal Mig equipment on short-arc. The wire brand that was most popular was called Evadur(sp) and I have no idea of the chemical composistion of the wire as I was just a pup then and not interested in such. It's been many moons ago when I ran miles of this wire, 70's and early 80's, for sealing high pressure HVAC duct work. Worked like a charm and very fast. It would run best on corner to corner welds or over lapping welds on round duct but not good on flat butt seam welds or angle iron to flat galvanized welds. On the angle iron to flat sheets we used the carbon-arc method with silcon bronze filler rod that I described as it would apply more concentrated heat but also added carbon to the weldment and that was down side to the process. Carbon would make the weld become brittle if not done correct. I have no idea if either process is still used as I've been out of the "loop" to long. AWS was not real popular during that time period and alot of older methods are not apporved in todays metal working world as most take a high degree of skill to make a good weld. Not ment as a slam to the new generation of welders, just a different era. T_Bone
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