Control over PWHT activities

[kamran]

Inspection points from AWS Welding Inspection Handbook, Article 8.2.1 (Heat Treating Inspection)

(1) Verification of preheat, interpass, and postweld heat treat temperatures
(2) Verification of surface cleanliness prior to preheating, welding, and postweld heat treating
(3) Calibration of temperature indicating and measuring devices and monitoring of their correct placement
(4) Monitoring the postweld beat treating operation to assure that the procedure requirements have been met
(5) Verification of the dimensional accuracy of the weidment after the final heat treatment
(6) Verification of weld quality after final heat treatment

Keep adding in.

[qaisarabbas]

>> Hardness Testing before and after PWHT for acceptance
>> No. of repeated cycles for a specific weld
>> Caliberation & Speed of Temerature Recorder & Verification of chart

[ashfaqanwer]

Go to the link to find more:
http://forums.thepetrostreet.com/viewto ... f=14&t=153