I gave up long ago attempting to learn how to oxy/acy weld while having tanks/torch mostly collect dust for 35 years, other than an occasional use for cutting, or bending something. After seeing/reading the benefits of the old school oxy/acy welding methods, and this "new torch" that has been around for 35 years originally sold under the name Henrob. Never knew of it until recently, and after checking it out I decided I had to try the Cobra 2000 complete torch kit for $500. Never liked the way my old torch cut steel, so I tried the cutting attachment first, to cut up some practice pieces. I'm going to quit using my Sawzall blades up because this torch cuts great. After 3 practice welds, I welded these 2 pieces of scrap sheet metal back together. No burn through, stayed flat, and was very easy to finish. After tacking one end I just welded the whole piece without stopping. MIG is quick and easy, but I think this torch could do much better on a lot of different materials.
https://www.youtube.com/watch?v=xl5pemu1OdA
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