Framebuilders - Flame setting
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03-15-09, 02:12 PM
Hello, Can anyone tell me what's the difference in results in brazing chromolly with a neutral, carbonizing, and oxyidizing flame? Which will yield better results etc.
03-15-09, 06:07 PM
I usually go for slightly carburizing or neutral flame. I'm not sure it really matters much for brazing.
just keep it out of the oxidizing range (loud hissing) and you should be good to go..
03-16-09, 07:08 PM
Always a neutral flame for fillet brazing, you can get away with a more carburizing flame on lugs- as was said, never an oxidizing flame.
03-17-09, 08:46 PM
Try a bigger carburizing flame for silver lugs, a smaller/louder carburizing flame on brass lugs, and a neutral to slightly carburizing for brass fillets and brass dropouts.
I have seen all kinds of different flames used. The idea of the oxydizing flame being bad is that it has a lot of oxygen in it, and this will tend to supply oxygen to the hot metal increasing the chance of oxydizing the steel. This is a reality with gas welding on steel, since no flux is required. If your flux is holding up then your steel is protected from oxydation so this ought not to be a problem. So it could be yet another crossed line with welding lore.
perhaps welding lore, but flux has a limited capacity to eat up oxides, so unless there is an actual reason to go with an oxidizing flame, I'd stay away from it.
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