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Technical & Reference Section => Tech and Restoration => Topic started by: emerbmx on August 27, 2008, 02:35 PM
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Would anyone have any ideas or tips on repairing 531 tubing cracks?
I have frame with cracked headtube, cracked along the weld, then continues a bit and reaches the top of the headtube.
cheers
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any brazing/ tig welding should do the trick, or oxy - acetylene, i take it the frame is os? if so u just need it to be cosmetic, a normal steel welding wire will work, no need to buy special 531 rods, hope this helps.
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yes its an old 83 quad.
cheers - that helps-
someone tried to weld it before and they dam near almost blew a hole through it.
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pm sent
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531 is manganese alloy? is that right?
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I just pasted this from wikipedia- didn't know it was from the home town :)
Reynolds 531 is a brand name, registered to Reynolds Cycle Technology of Birmingham in the United Kingdom, for a manganese-molybdenum medium carbon steel bicycle tubing.
Introduced in 1935, and for many years at the forefront of alloy steel tubing technology, it has been replaced and superseded by ever more complex alloy mixtures and heat-treatment/cold work cycles as Reynolds has continued to compete with other manufacturers of steel for the bicycle industry.
The approximate alloying composition for 531 is 1.5% Mn, 0.25% Mo, 0.35% C, and is similar to the old British BS970 En 16/18 steel. Its mechanical properties and response to heat-treatment are broadly similar to the AISI 4130 standard alloy steel, also used for bicycle frames, amongst other applications. This material was used to form the front subframes on the famous Jaguar E-Type of the 1960s.
Reynolds 531 is now only available to special order. But in the past was use by "Raleigh Bicycle Company" of Nottingham, England for their racing cycles, with other Reynolds tube used for the professional models.
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Have a word with Animal or Sawzall , both have repaired os bikes with Reynolds tubing ..
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Get it welded up with mild steel wire and finished back , welds r always stronger than the metal it welds! find somewhere where they do Tig welding bung them a few quid, and they will do all the prep work aswell :daumenhoch:
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thanks mate
mild steel wire's the best bet- super
thats great.