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Question Related to Post Weld Heat Treatment

post weld heat treatment

1.What is mean by  ‘PWHT’ why is required ?
POST WELD HEAT TREATMENT” this is done to remove residual stress left in the joint which may cause brittle fracture
2.Why pre-heating is done on some pipe before starting welding?
To slow down the cooling rate
3.Why post –heating is done on some pipe after the welding is over ?
To maintain uniform homogeneous structure.
4.What is the pre-heat temperature for carbon steel above  19.05 mm  thk
Pre – heat temperature for carbon steel above 19.05mm is 80 ° C
5.Is post heating required for carbon steel material above 19.05 mm thk
No, post heating is not required for carbon steel material of any thickness.
6.What is the soaking temperature during stress for carbon steel material ?
Soaking temperature for carbon steel material during stress reliving is 620 C  ( +/-20  ° C)

7.What is the soaking period during reliving for carbon steel material ?
Soaking period for carbon steel material during stress reliving  is 1 hr
8.What is the rate of heating & cooling during stress reliving for carbon steel material ?
The rate of heating & cooling steel material during stress reliving is 150 ° C/hr
9.What is the pre- heat temperature stress reliving for alloy steel material ?
Pre-heat temperature for AS material is 180° C
10.What is the soaking temperature during stress reliving for alloy steel material?
Soaking temperature for alloy steel material  is 720° C ( +/-20  ° C)
11.What is the soaking temperature during stress reiving for alloy steel material ?
Soaking period for alloy steel material is 2 hrs
12.What is the rate of heating & cooling during stress reliving for alloy steel material?
The rate of heating & cooling for alloy steel material is 100°c/hr
13.What is the post heat temperature for alloy steel material ?
Post heat temperature for alloy steel material is 300°c

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