This topic should have been in tool talk but none the less, propane doesn't use a neutral flame which provides the proper atmosphere for fusion welding. On steel under about 2" acetylene will give the best and fastest cut using the proper size tip. On thicker steel propane has an advantage because it has more BTU's in the secondary flame which helps to preheat the steel ahead of the cut. Acetylene has way more BTU's in the primary flame and a higher flame temperature.
Another trick to light propane is to put the tip on the metal at an angle and then light it. Propane is cheaper to buy than acetylene but uses about a 3 to 1 ratio with oxygen compared to close to 1 to 1 with acetylene, which means the savings aren't as great as originally thought. I prefer acetylene for several reasons. One of the biggest is that it's easy to clean the tips and you can see a little better because the tips are narrower. The 2 piece tips are a pain to clean. You have to take them apart every time. I've used just about every kind of gas for cutting and acetylene gives the nicest cut. If you have lots of heating to do with a very large rosebud, propane makes more sense because you don't have to worry too much about withdrawing it too fast. Acetylene you have manifold 2 or more cylinders together. I'd guess Magna gas is a kind of methyl acetylene but still wouldn't use a neutral flame. I don't think there is a substitute for acetylene when it comes to fusion welding.
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