I've personally seen it done on plate as thick as 2 inch and it worked just fine. Thing is you have to be using a big tip, like #7, and you have to crank the oxygen pressure up around 70 plus to do it. Still I too understand what your saying about using another torch to preheat ahead of another torch on really thick material. When cutting a bevel I can see where this would particularly be needed as the preheat flames from the cutting head aren't directed completely at the plate but rather at an angle to it which cuts the heat input from them tremendously. As far as an actual flat cut on a cutting table goes, if you watch many of them after the preheat phase is complete the torch head will actually rise up from the plate before starting the cut. In rising like this, even though they don't cut the gas off, this removes the small, blue preheat flames from the process as they aren't needed until starting the next cut. Like I said the main thing when trying this is to be able to maintain the correct cutting speed as too fast or too slow will easily kill the cut.
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Today's Featured Article - Product Review: Electronic Ignition - by Staff. Oil, for example has come a long way in the last 50 years and I don't use anything but the latest API grade available. I've heard the arguments for non-detergent oils but would never trade it for today's formulations. Paint is another, the modern acrylic enamels are great for resistance to grease and fuel stains, retaining their shine and they last forever; unlike enamels and lacquers . Still another is the alternator. No doubt using the original generator keeps the tractor pure, but for thos
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