Suitable materials include steel nickel copper brass and aluminium.
Flame straightening sheet metal.
If expansion is restricted stresses build up.
When straightening stainless steel heat it only until a deep brown color is seen on the surface.
The torch can now be moved along the length of the area to be straightened.
Upon cooling the metal contracts more than it could expand when heated and any resulting distortions can therefore be straightened out.
Body files are usually used after another age old process has been used to straighten or shrink sheetmetal.
For a full shrink on steel the spot is heated until a dull red color is seen.
Heating localized areas and then using a hammer and dolly to.
Metal materials have the property of thermal expansion and contraction.
Removing deformations with an oxy acetylene flame this process is based on the physical principle that metals expand when heated and contract when cooled.
The heat shrink begins at an edge or in a single spot.
The flame straightening uses this new deformation to correct the original deformation.