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Re: [MW:32726] QW 200.4: Combination of Welding Procedures

By Materials & Welding
Dear all

Simple logic is we have to refer qw 451.1 only ,thickness range should be as per qw 451.1.

This clause come to in highlight due to heat sink . In high thickness heat sink happen thats why this method of weleing used

On Wed, 29 Dec 2021, 7:35 am Sudhakar Kuppuswamy, <sudhakarceng@gmail.com> wrote:

Hi,


Currently one of my clients is having an ambiguity in applying the requirements of ASME Section 09 Clause QW 200.4: Combination of Welding Procedures, Subclause:  a & b requirements. Hence, support is required in finding an interpretation from ASME Section 09. (Interpretation in CS connect is not apparent for this clause)

Background: Two PQRs were qualified separately, PQR A is qualified with SAW process using 8 mm thickness plate and PQR B is qualified with SMAW process using 8 mm thickness plate.

Question: While combining the two PQRs to weld a plate with thickness(es) ranging from 1.5 mm to 16 mm.

Do as per QW 200.4, it is necessary to have the root pass process PQR need to be qualified on a minimum 13 mm thickness plate?

I'm pretty sure it is not required to have a root pass process PQR with minimum 13 mm thickness in the above case. However, it would be helpful if you found any interpretation on this.


Regards,

Sudhakar K CEng MWeldI,IWE.

Welding & Metallurgical Engineer,

Email: sudhakarceng@gmail.com.

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