The non heat treatable aluminum alloys may be torch annealed many times to achieve the necessary shape.
Annealed aluminium sheet.
The sheet work is now nearing completion and the zippo top is taking shape.
Avoid machining aluminum in its annealed state it s really sticky and it doesn t cut cleanly any more.
You can see that welding clamps were also used for tight short bends.
The main reason to anneal aluminum is to improve malleability.
The distorted dislocated structure resulting from cold working of aluminum is less stable than the strain free annealed state to which it tends to revert.
The soft annealed aluminium is beaten over various diameter pipes with a soft mallet.
In zone refined aluminum this reversion may take place at room temperature.
Easy to form pure 1100 aluminum sheets and bars because 1100 aluminum is 99 pure it offers superior formability corrosion resistance and electrical conductivity.
Any involved forming can lead to cracking or fatiguing the material but annealing can reduce these problems.