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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 02-09-09, 08:58 PM   #1
AntsMarch
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Welding question

Hello Everyone,

I have an old ten speed that I am converting into a single speed, since the derailers are no good and I am not very comfortable with down tube shifting anyhow. I am in the process of removing all the old paint and planning on repainting it. Before I do that I would like to weld some nuts onto the frame for a water bottle cage and for a rear rack. I will not be doing the welding myself, but my buddy at school will be doing it. In our shop at school we have access to mig, tig, arc, and acetylene. I am unsure if the frame is composed of cro-moly or steel. So my question is, which welding method is best and what settings should we use?

I appreciate any help,

Branden
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Old 02-09-09, 10:44 PM   #2
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Hi Branden,

Cro-moly is steel; it's just a specific steel alloy containing chromium and molybdenum.

The water bottle cage bosses and eyelets for the rack are called "braze-ons", and should be, uh, brazed on (not welded). An oxy-acetylene rig would be the best for this application, and for filler material you could use either brass or silver with lots of the appropriate flux.

The brazing procedure will be the same regardless of whether the frame is hi-ten carbon steel, cro-moly, manganese-molybdenum, or some other steel alloy.
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Old 02-10-09, 12:12 AM   #3
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Thanks for the help Scooper!

Well oxy-acetylene it is. I am sure we have brass down in the shop. Now I can continue with my SS conversion, and have a decent commuter bike other than my MTB.

Branden
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Old 02-12-09, 02:09 PM   #4
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Originally Posted by AntsMarch View Post
Thanks for the help Scooper!

Well oxy-acetylene it is. I am sure we have brass down in the shop. Now I can continue with my SS conversion, and have a decent commuter bike other than my MTB.

Branden
You can get the small parts (bottle bosses, rack mounts, etc.) here.
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