Post
welding heat treatment for Stainless steel
In laser welding process of stainless
steel, the post weld heat treatment is generally required, in particular,
Martensitic, ferritic stainless steel, choose the correct preheating before
welding and post weld treatment is necessary to ensure the quality of the
welding laser welding machine. So what would be like in the end after welding
stainless steel heat treatment process?
Post weld heat treatment on tensile strength of stainless steel, is
related with creep limit, heat treatment temperature and time of insulation. Effect
of heat treatment after welding stainless steel, the impact toughness is
different from the different types of steel. Generally the after welding
process of stainless steel, there are two treatment for choice, one is single
high temperature tempering , the other is normalizing and tempering treatment.
1. Normalizing and tempering
For oxyacetylene welding is tread with fire and high temperature
heat. his is because the grains of weld gaps and heat affected zone of welding is
coarse, refinement is needed, so the use of normalizing.
2. Single high-temperature tempering
However single fire could not eliminate residual stress, needs
further tempering stress relieving. Medium-temperature tempering applies only
to single site Assembly of large General Assembly welding of mild steel
containers, which are designed to achieve some stress-relieving and hydrogen.
Most of the occasions is the choice of a single high-temperature tempering.
Heat treatment for heating and cooling should not be too fast, to inside and
outside wall uniformity.
Post weld heat
treatment to eliminate the relaxation of welding residual stress of stainless
steel stable shape and size of the structure, reducing distortion; weld metal
ductility; improving fatigue strength improving stress corrosion resistance
ability prevent the occurrence of delayed cracking, stainless steel heat
treatment after welding is therefore very important.
Post weld heat treatment to eliminate the
slack stainless steel welding residual stress; keep stable structure of shape
and size, reducing distortions; improve the ductility of the weld metal;
improve the fatigue strength; improving stress corrosion resistance ability
prevent the occurrence of delayed cracking etc. So after heat treatment of stainless
steel welding is very important.
No comments:
Post a Comment