Heat treatment process after laser welding stainless steel

Performing laser welding process of stainless steel, the general need for post-weld heat treatment, particularly martensitic, ferritic stainless steel, select the correct preheat and post-weld process is to ensure the necessary conditions for stainless steel laser welding machine welding quality. So in the end after welding stainless steel heat treatment process is like?
Post-weld heat treatment of stainless steel tensile strength, creep limit the influence of heat treatment temperature and time related. Effect of heat treatment after welding stainless steel impact toughness of steel with different types and different, generally after a single stainless steel weld heat treatment process selection tempering or normalizing and tempering treatment:
1, normalizing and tempering
For gas welding weld normalizing plus high temperature heat treatment. This is because the grains weld and heat affected zone of welding of coarse grain refinement needs, so the use of normalizing.
2, a single high-temperature tempering
However, a single normalizing residual stress can not be eliminated, so the need to remove stress coupled with high temperature tempering. Assembly and welding single tempering is only applicable to large sites assembled ordinary low carbon steel containers, which are designed to achieve the elimination of residual stresses and part dehydrogenase. The vast majority of occasions is the choice of a single high-temperature tempering. Heat treatment of heating and cooling should not be too fast, and strive outer wall evenly.
Post weld heat treatment to eliminate the slack stainless steel welding residual stress; shape and size of a stable structure, reducing distortions; improve the ductility of the weld metal; improve the fatigue strength; improve resistance to stress corrosion; cracking prevent delays, etc., so the stainless steel welding after the heat treatment is very important.