Hello, the heat treatment to improve the microstructure and properties of welded joints or eliminate welding residual stress after welding is called post-weld heat treatment. Post-weld heat treatment of welded joints aims at:

(1) Reduce the residual stress.

(2) Adjust the mechanical properties of the welded joint.

③ Improve the metallographic structure of weld metal heat affected zone.

Post-weld stress relief heat treatment has the following functions:

(1) Reduce or eliminate welding residual stress caused by welding.

Reduce the hardness of heat affected zone.

(3) Reduce the content of diffused hydrogen in the weld.

(4) Improve the plasticity of welded joints.

(5) improve that impact toughness and fracture toughness of the welded joint.

(6) Improve stress corrosion resistance.

(7) Improve the organizational stability.