Yes it is true that by physical appearance (Next day after PWHT), one can say that PWHT is done for CS welds. However, effectiveness of PWHT can also be verified by production hardness test…Let client witness hardness test.
If you want to do PWHT more than one time for reason of weld repair or any other, base materials & welding consumables shall be simulated for the more than one time heat treatment to ensure it retaining mechanical properties after required cycle of PWHT.
Sometimes job PQR also reflects additional PWHT once, twice, thrice..... as required. Generally it is shown in PQR with extra holding time.
Regds/Jignesh
On Monday, 4 July 2016 10:56:00 UTC+5:30, muthu barathi wrote:
Hi experts,
Contractors carried out the PWHT and graphs available with correct data's. Due to urgency the contractor has painted and erected. It is CS material.
Now the owner rejected the reports and asking for PWHT again.Please send me your best answer if the PWHT is carried again , whether it will affect the welding and material properties and how to prove that PWHT has been carried out. How many times the PWHT could be carried out repeatedly.
Please send your replies.
Thanking you.
With Regards,
Muthu Barathi P.
Sent from RediffmailNG on Android
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