Stress-relief heat treatment

During the pre-treatment of a workpiece, we remove as much material as possible. This process creates stresses inside the workpiece, particularly when larger workpieces are involved. When these stresses are released during the finishing process, the workpiece can be deformed to such an extent that we do not achieve the required tolerances. An interim stress-relief heat treatment is then a solution. A temperature of between 500 to 700 degrees is used for stress-relief heat treatments. The workpiece is slowly heated and cooled to prevent creating new stresses and to release existing stresses in the workpiece. Stress-relief heat treatment can be the perfect solution for complex jobs!

Besides stress-relief heating pre-treated workpieces, stress relief heat treatments are also suitable for welded parts. High temperatures are created during welding. When the material subsequently cools, it contracts. At the same time, contraction is inhibited by the surrounding colder material. This creates internal stresses in and around the weld. By stress-relief heating the parts after welding, these internal stresses can be released.

The stress-relief heat treatment technique has several benefits:

The stress-relief heat treatment technique has several benefits:

  • Ability to eliminate internal stresses in welded structures
  • Minimises the risk of changing dimensions and the presence of stresses after treatment

Stress-relief heat treatment at AFMI

At AFMI, we can provide stress-relief heat treatments for workpieces up to a maximum dimension of 1,600 mm x 1,400 mm x 900 mm and up to 850°C. A stress-relief heat treatment certificate can be issued for all the heat treatments we perform.

For more information about stress-relief heat treatments, click here to read more.