Re: [MW:13581] Simulation Heat treatment of coupons

Hi,

Response to Que 1:- Intent of code is to account any expected scenario such as Repairs which
would call for multiple PWHT cycles (usually restricted to 3 cycles) therefore simulation heat
treatment is to be carried out for same PWHT cycles in order to know exactly by how far,
mechanical properties would be degraded. I am not familiar with mentioned code but per ASME Sec
viii div 1, UCS-85(c), following variables are to be accounted:-
• same heat treatment above A1
• min. 80% of total time at temperatures
• similar temperatures, time and cooling rates

Response to Que 2;- Just follow qualified PQR within the limits of essential/non-essential
variables and forget about given clause.

Regards
Manpreet Singh



On Wed, 25 Jan 2012 20:37:07 +0530 wrote
>Dear Experts,

As per Axens IN-42.0 Rev. 2.1 Cl. No. 4.1.3, The mechanical tests shall be carried out after
heat treatments simulating those anticipated along the fabrication that isPFHT, intermediate
H.T., if any, and final PWHT plus additional heat treatments to anticipate potential repair.

In our job there is no PFHT and intermediate H.T. Only final PWHT. As per PMC, we shall have to
cosider 1 job cycle + 2 additional S.R. cycle for simulation. My question is, shall we have to
take two seperate coupons for mechanical testing or we can simulate 3 S.R. cycle onsingle
coupon for mechanical testing? As per PMC, one job cycle to be simulated on coupon and
Mechanical testing to be carried out and 2 S.R. cycles to be simulated on another coupon and
Mechanical testing to be done. I am approaching to simulate 3 S.R. cycles on single coupon for
mechanical testing.

Further, as per Cl. No. 5.3 (Heading WeldingConsumables Chemical Analysis)of Axens IN-42.0 Rev.
2.1, The deposited weld metal shall basically match with the nominal chemical composition of
the base material as specified in ASME Sec. IIC for the selected electrodes. Basis on this, PMC
is approaching for chemical analysis of test coupon. Is there any need to carry out chemical
analysis of test coupon or we may consider batch test certificates of welding consumables for
chemical analysis?

Please reply me on the above at the earliest. It shall be very very thankful to me.

Thanks & regards,


C. R. GANDHI
(Manager- Q. C.)



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