No the CW on 853 is that it is for tig welding and must be heated to a high temp. in the joining process. It is an air harderning tubeset. NOT to be confused with 753 which loses the benefits of its heat treatment if brazed at high temps. It's "silver only" on 753, therefore it requires tight fits since silver solders don't fill as well. At least that's what they used to say. I see now why there was mention that 653 was non-heat treated 853. Apparently the person who said this was thinking of 631 (about which I know zip). LouDeeter@aol.com wrote: I've been following all of this and based on this website (below) for Reynolds tubing, something seems amiss. The site says to braze at high temp and not use silver solder. Conventional wisdom would seem to be the opposite. Anybody really know anything about this? Lou Deeter, Orlando FL
http://www.reynoldsusa.com/
Tips on what you MUST do with Reynolds 853 / 653:
Weld or braze the material at a temperature above 850 C (1560 F). Use tungsten Carbide cutting tools or high speed steel, well lubricated and with a relatively slow feed rate. Allow to cool naturally away from draughts after jointing operations. Any setting should be done ìcoldî when necessary.
Tips on what you MUST NOT do with Reynolds 853 Attempt to machine or drill in the areas of the heat affected zone after welding or brazing, as these areas will be extremely hard. Attempt to undertake severe manipulation of tube section in the as-supplied heat-treated condition. Please note: Since 631 is not a heat-treated tube, some manipulations/forming are possible prior to assembly into the frame. Do not joint using silver solder or other low temperature brazing below 850 C (1560 F) except for attaching fittings. Do not force cooling with air, oil, water or any other medium.
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