Materials & Welding: RE: [MW:31100] SP0472 STANDARD

Sunday, July 5, 2020

RE: [MW:31100] SP0472 STANDARD - WPS

Hello Vishwas,

Please see the appropriate extracts from NACE SP-0472 for your information. Appendix C Summary of Cooling Time (t8/5) Concept is purely theorical. The explanations are clarified in the relevant text and figures. Yes a combination of preheat, control of inter pass temperature 2 dimensional vs 3 dimensional heat flow all are important factors to control hardness. The hardness requirements as per this document is clarified in Section -2 (as attached).

Note SP-0472 is not a design document. It's more of a supportive document to MR-0103. Hence for WPS/PQR qualifications one has to fulfil the requirements of MR-0103 ( when indicated in the contract) and SP-0472 only for the hardness control.

Your query does not state the design requirements. If the hardness of 248 HV10 meets the design requirements then the PQR should be accepted , provided all the welding control as per SP-0472 are fulfilled.

Thanks.

Pradip Goswami, P.Eng, IWE

Consultant-Welding-Metallurgical Engineering

Cell & Whatsapp-905-9793232.

Personal:pradip.goswami@gmail.com

From: materials-welding@googlegroups.com <materials-welding@googlegroups.com> On Behalf Of Charles Jacob
Sent: July 5, 2020 3:21 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:31097] SP0472 STANDARD - WPS

Dear vishal,

Pl follow EN 1011-2. It gives complete details of welding requirements for steel. Summary of Cooling Time (t8/5) Concept is a general guidance on how to control cooling rates , in order to avoid

Regards,

Charles

On Sun, Jul 5, 2020, 11:07 AM Vishwas Keskar Welding Manager WELDING <vvkeskar123@gmail.com> wrote:

WPS is prepared without PWHT with HARDNESS check in PQR .
It meets Hardness less than 248Hv10 along CE requirements as per SP0472

Std states that hardness Control shall be
1) CE control
and THERMAL TREATMENT - We intent to apply t8/5 concept.

We have to incorporate t8/5 in WPS as per Customer advice .

Can somebody throw light on SP0472 and t8/5 cooling time requirements / concept . How it is to be applied theoretically as well as practically during production usage

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