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hey guys,most common non-ferrous metals suffer from "work-hardening".The become more rigid, less maleable, and brittle, the more they are hit or bent or flexed.The simple cure is to heat them up a bit. ack in the bronze ageThis lets the metal crystal structure relace into its tempered or annealed state.This technique was used way back in the bronze age. This can be used to eliminate the grain problem on rolled aluminium.It also means that hub bars can be reqularly "reconditioned"Rather then sending them away for a specialised inspection process after 500 hours, perhaps we can just stick them in an annealing oven at a prescribed temperature for a prescribed length of time.It should be easier to find an annealing over than that specialist surface eddy current thing.Personally, I'd rather a "reconditioned" bar than an "inspected" bar.i'll see if I can find something out about annealing aluminium.Don
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Initial indications are that it is fiendishly complex,but well understood by the aluminium industry.Annealing requirements vary with alloy, and in tern can greatly vary tensile strength.We should contact the manufacturers of the alloys used, to determine what annealing they use in manufacture, and how we can restore hub bars to as-nre condition.Don
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