Does anyone have any recommendations for how I can bulk anneal
tubing? I have ~200 ft. of a custom size of tubing (about 4mm OD w/ a
thin wall) headed my way, most likely in an “as drawn” temper. I need
it dead soft for my application. The idea of getting out the torch
and annealing by hand is a bit daunting, especially since I will
receive it in random lengths up to 6 ft!
I was pondering a kiln approach along these lines:
-chop up tubing into ~1ft lengths
-get stainless steel “crucible” (maybe some restaurant supply thingy
like they use in cafeterias for storing silverware?)
-pack “crucible” with tubing
-lay plate on top to exclude air
-anneal for a good long time to make sure center of load reaches
I’d appreciate any refinements, alternatives, or other ideas. For
example, is it silly to contemplate filling the void volume in the
pack crucible with powdered charcoal to help minimize oxidation?
Seems like it would be incredibly messy…maybe better to just accept
the oxidation and pickle later? Or maybe the whole “crucible” thing
is overkill, and I should just chop up the tubing, bundle it up with
some binding wire and bang it into the kiln for an hour.