Materials & Welding: Re: [MW:31874] PWHT required after Preheat for CS or LTCS

Saturday, December 19, 2020

Re: [MW:31874] PWHT required after Preheat for CS or LTCS

I think it is extremely important that colleagues who ask a question in this forum structure it in the most complete way possible, because those of us who are here in the forum cannot be guessing many of the variables of the problem posed, many assume that some issues are taken for granted, but the truth is that we are not facing the problem you are presenting and therefore we cannot measure the magnitude of this problem, hence the importance of asking exact questions, giving all possible details, these They are: Exact material specifications, building code if any, customer specifications, type of service and a thousand other things that will serve us and will shed light on the nature of the problem and this will give us more data to help them in the most efficient way. possible, you see the problem live, we will have a more or less clear idea as you provide the largest and best amount of information ion, WE DON'T GUESS FOR MANY YEARS THAT WE HAVE EXPERIENCE.
Thanks for understanding.
Cheers!.

El vie, 18 dic 2020 a las 22:39, Ramin Kondori (<raminkondori@gmail.com>) escribió:

Dear Thanh,

Aside from code requirements, it depends on toughness requirements for the job (Impact test).
The welding procedure qualification for LTCS materials (e.g. A333) normally includes impact testing (e.g. at -48C); and without PWHT, it is not easy to pass this test and in the end, you have to perform PWHT to have your PQR approved. Most probably, you have to perform PWHT on all thicknesses.

Regards

Ramin Kondori
Sr. QA/QC & Welding Engineer
-----------------------------------------------------------
PG-Dip. in Welding Engineering (IWE AT 0070)
BSc. in Civil Engineering (IUT)
BGAS Painting Inspector
ASNT Level I&II

On Thu, Dec 17, 2020 at 7:17 AM thanh tung Nguyen <tungexp.268@gmail.com> wrote:
Dear Experts,

Hope you all are well.

I have a question is about the weld of the base material of CS (or Low temp. CS) with wall thickness greater than 25mm, Do we still required PWHT if we applied a preheating process before, or PWHT is no longer mandatory?

And which reference can be found?

Thank you & best regards./.

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