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Hi Nik, I couldn't find a thing on carbon flame torchs in any of my older books, back to the 40's and 50's. I personally have never heard of the term carbon flame torch. With your machine at 50a I think what there refering too is carbon arc welding and that I have experience with. Carbon arc is where you use DCEN for the copper clad carbon electrode. You peal back the cooper, then sharpen the carbon to a fine point then snap off the point with your thumb. You then use a silicon bronze filler rod on the metal, stick the carbon electrode on top of the filler rod until the carbon becomes cheery red, then slightly lift the carbon from filler rod and begin welding. This welding process works well for seal welding SM. About 33kpsi tensil strength. A second welding process is a spot welding method. You use a copper clad carbon electrodes in both the ground clamp and normal electrode holder. I've never used this process but it doesn't look like a good process as you need to break current and most likely will break the electrode when trying pull away. If not then it wouldn't spot weld. Another process method called air-arc cutting uses a copper clad carbon electrode in a specical electrode holder with a air jet. Again you stick the carbon to the metal to be cut letting the carbon rod heat, then pull off the base metal slightly at the same time applying air pressure. The carbon pre-heats the base metal to be cut and the air removes the molten metal. This cutting process is very common for back gouging welds so another weld can be made on thick plate. If someone else can enlighten me to another process with carbon electrodes I'm always willing to learn. T_Bone
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