s. Later, the brass welds can be sanded perfectly smooth for an incredibly beautiful finish.
Hi Ron, Great article on this nice bike. One correction however, brazing (despite the name) uses BRONZE rod, not brass, as the filler material. Bronze is stronger and more corrosion resistant than brass.
Many bronzes are significantly stronger than mild steel.
I used to modify motorcycle frames quite a lot, and always brazed them rather than welded. Brazing has several advantages over any form of fusion welding:
-The parent metal is not melted during the operation, so does not tend to become brittle along the edge of the weld;
-The bronze (when brazed by a skilled operator) tapers nicely from its maximum thickness in the middle of the joint down to the surface of the parent metal. This feeds the stress from the joint smoothly into the parent metal. Some welds change cross section rapidly at their edge, producing a "stress-raising" sudden change in area.
-Both of these factors mean that a brazed joint can be significantly less affected by fatigue than a weld.
And, as you say, can look nice as well
For these reasons, the tubular chassis of the Arial Atom sports car is brazed, not welded. They had to go round the old folk's homes to find retired craftsmen who were skilled in brazing, because it is pretty much a "lost art"! The retirees taught a new generation the methods.. and a few frame builders are keeping it alive too.