Annealing Copper Sheet Gas Torch

I m working on a chasing and repousse project and i m attempting to anneal a copper sheet that i think is about 6x6.

Annealing copper sheet gas torch.

Having some trouble annealing copper sheet using mapp gas torch. Annealing copper requires you to heat the copper so that it softens as soft copper can be worked without becoming brittle. Many torches generate sufficient btu and flame temp to anneal a large copper sheet but the copper conducts the energy so readily that it acts like a giant heatsink radiateing energy acrosss its entire surface faster than you can get it in. Step 1 completely shut off the valves on the oxygen and acetylene tanks.

The torch head is a pencil tip and i am using mapp gas. Annealing is a method of softening metal that has been hardened by one method or another. Anneal bend a little anneal again bend a little and repeat. Hold the flame 3 4 in 7 6 10 2 cm from the copper you re annealing.

You should have a form to bend it against. Hold the flame farther than 4 5 inches 10 13 cm away and the copper will take a long time to heat. Copper is one of the metals that hardens when it is worked bent stretched. When you anneal copper it expands and becomes soft and pliable thus giving you a seal once the copper has been compressed.

Propane will work fine to anneal the copper pipe you will have to anneal several times while you try to bend it. I have a feeling the piece is just too large to get it to cherry red within a reasonable amount of time. If all you want to do is color the copper a small torch will likely do the job but you are not likely to be able to actualy anneal any signifiacnt size piece. If your torch cannot get the entire gasket cherry red all at the same time it will be fine.

Connect the torch head to the oxygen and acetylene tanks using the torch hoses. If you hold the flame much closer to the copper you ll burn the metal s relatively delicate surface.