Re: [MW:32862] Re: QW 200.4: Combination of Welding Procedures

sir,

....for Roof assembly are being welded on the ground and once you erect complete roof, I don't think you can weld with SAW weld, which require set up and where 1G welding is possible.,roof plate welding even manual expert welders are facing problems due to gap and space restriction...

On Monday, February 14, 2022 at 6:17:42 AM UTC+3 Sudhakar Kuppuswamy wrote:

There are benefits! What if there are large tank job and one need to weld the roof joint butt welds, where back chipping is required. we can effectively weld root pass with SMAW & further passes with SAW. Good productively can be made.

Regards,

Sudhakar K CEng MWeldI,IWE.

Welding & Metallurgical Engineer,

Email: sudhak...@gmail.com.

On Sun, Feb 6, 2022 at 4:00 PM Mohd Siraj <mohd...@gmail.com> wrote:

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

pl, check one is semiautomatic and one is a manual process, I don't see benefits of the combination.?...

furthermore,

welding Root wirh SMAW and over it SAW OR welding Root with SAW over it SMAW does make welding complex.

On Wednesday, December 29, 2021 at 6:35:29 AM UTC+3 Sudhakar Kuppuswamy 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: sudhak...@gmail.com.

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