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Framebuilders Thinking about a custom frame? Lugged vs Fillet Brazed. Different Frame materials? Newvex or Pacenti Lugs? why get a custom Road, Mountain, or Track Frame? Got a question about framebuilding? Lets discuss framebuilding at it's finest.

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Old 03-15-09, 01:12 PM   #1
longneck
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Flame setting

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.
Thanks, Zig
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Old 03-15-09, 05:07 PM   #2
unterhausen
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I usually go for slightly carburizing or neutral flame. I'm not sure it really matters much for brazing.
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Old 03-16-09, 05:50 PM   #3
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just keep it out of the oxidizing range (loud hissing) and you should be good to go..

~Steve
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Old 03-16-09, 06:08 PM   #4
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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.
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Old 03-17-09, 07:46 PM   #5
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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.

Good luck!
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Old 03-17-09, 11:27 PM   #6
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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.
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Old 03-19-09, 03:31 PM   #7
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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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