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Pagan Wizard
05-08-2008, 02:16 AM
One of my co-workers suggested that I try "56% cad free silver brazing" rather than actually welding. He said it is much safer for someone like me who knows nothing about welding to begin with, and it is actually very safe for bicycle building. He sent me a link to SmartFlix where they offer a 7 DVD set for rent showing how to build a bicycle ground up with this method. Check it out and post your thoughts please......thanks in advance.

http://smartflix.com/store/video/4127/Lugged-Framebuilding

Pagan Wizard
05-08-2008, 05:23 AM
So this one would probably be more appropriate then??

http://smartflix.com/store/video/343/Brazing-with-the-Oxygen-Acetylene-Torch

trikeman
05-08-2008, 04:43 PM
Wizard, if you haven't already seen it, there is a very good set of pages that show the process of brazing up a lugged frame at LittleFish

http://www.littlefishbicycles.com/frame/index.html

nzvet
05-14-2008, 08:33 AM
Briefly.....

56% silver is used exclusively for lugged frame building. When heated to its liquidus state, it flows much like hot water, making it perfect for filling the tiny gap between the tubes and the lugs. But, 56% is largely unsuitable for nearly any other type of jointing method. And at roughly $400 a pound, it gets real expensive... real fast......

Am in agreement papa! I recall 56% being good for low temp tiny joints also and am familiar with it being used in such applications like joining hydraulic components. I've used 34% on all my homebuilds which cost wise and versatility worked well. A local commercial bike frame builder I'm aware of uses 42% for initial joints and then builds the fillet with 34%. His fitting tolerances are however exceptionally close and beyond my ability as is the factory finish of his bikes.