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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