Join Date: Aug 2007
Location: Arcadia, California
Bikes: Lemond "Alpe d'Huez," several X-marts, and two Trek hybrids
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7075 Aluminum Problems?
Although I'm not a framebuilder myself, I would like to ask you people in the know something about 7075 aluminum.
7075 aluminum, in the T6 temper grade, is one of the strongest aluminum alloys and is used frequently in aerospace engineering. Supposedly, the main problem that prevents it from being a popular material for bike frames is its problem with weld cracks. Thus, 7005 is preferred. The 7075 material is otherwise used quite frequently in chain rings, which do not require welding and can be forged/CNC-machined.
But I've seen some bikes (including here in BF) that have frames made from 7075, so how are they joined? The frames don't look brazed/lugged.