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Letter 41050
Problem annealing large table top copper
sheet
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I am making a copper topped coffee table. It is 26" X 52"
using 32 oz. roofing copper. I have hammered the entire
sheet to get handcrafted look. Naturally it has curved up.
In trying to anneal it I don't think I got this entire sheet
"red" hot. I'm using propane torch. Do I need to get copper
totally "red" hot so to anneal??
Rick De Troyer
artist - Chelsea, Mich
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First of two simultaneous responses -- ++++++
Annealing copper depends on both time and temperature. 1000F will
anneal copper in seconds, 350F in an hour. Copper conducts heat so
well, that I think it will be difficult to get and keep it hot enough
with a propane torch. Ideally you would put it in an over for an hour
@ 350F. It could be loosely rolled up to fit. Got a friend at a
pizzeria?
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Jeffrey Holmes,
CEF
- Spartanburg, SC, USA
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Second of two simultaneous responses -- ++++++
You are going to oxidize the copper to several colors if you use a
torch. To correct the warping, turn it over and hammer the backside
as required to get it to go dead flat.
James Watts
- Navarre, Florida
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To Jeffrey Holmes or whomever else may have the knowledge ~
I tried annealing a sheet of 14-16 Ga. copper in a 350 degree oven
for two hours in the past only to have it come out with rainbow
colors but still very very hard. Can you tell me where I've gone
wrong?
Dick Tracy
- Grand Rapids, MI, U S A
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