Dear Kiran
This requirement in ASME/AWS D1.1 is a supplementary essential variable and required when the construction code requires the component to be impact tested.
Generally we have the PQR PWHT time at temperature held long enough to cover 2 heat treat cycles of the thickest material to be welded. That way if we need to have a second heat treat cycle for any reason e.g weld repairs the welds are qualified. This is cheaper than having to re-qualify.
PQR must have the hold time so that it is at least 80% of the hold times used for production. If the production welding will need 2 hours of hold time the PQR must have 80% of 2 hours = .8 x 2 = 1.6 hours. The PQR must also be held at temperature for the construction code minimum based on weld thickness.
On 22-Jun-2020, at 9:38 AM, K K <karan.hbl@gmail.com> wrote:Dear All,Please describe to me regarding 3 cycle PWHT requirements as per ASME.If my PQR tested with two coupons where I required one more test coupon and additional one more for repair.Please explain to me in detail and related to mechanical testing for PWHT.What is the meaning of this paragraph - **an additional one PWHT cycle shall be incorporated to simulate field repair or modification.**Thanks and RegardsKiran--
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