Lugged bicycle frames, for example, are now manufactured by automated machines. (For additional strength Schwinn also brazed steel sleeves into the interior of its frame tubes at the joints.)įillet-brazed bicycle frames are strong and have a neat and clean appearance, but they are uncommon because of the additional craftsmanship required. The extra thickness of the fillet also provides strength, and its smooth contour distributes stresses evenly. ![]() In this method of bicycle frame construction, "mitering" or cutting the tube ends so that they fit together precisely is critical so that capillary action will draw the molten filler into gaps for a strong joint. Fillet brazing involves building up brass filler metal in a smooth "fillet" around joints. Fillet-brazing is an alternative method of constructing high-quality lightweight bicycle frames without the use of lugs.īrazing is a joining process employing a filler metal, like brass, that melts below the melting temperature of the parent metal workpiece. ![]() Until the recent rise of quality TIG-welded and composite bicycle frames, most high quality lightweight bicycles used lugs (external metal sleeve fittings) to join their frame tubing.
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