SP0472 STANDARD - WPS

[Vishwas Keskar Welding Manager WELDING]

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

[Charles Jacob]

Dear vishal,

Pl follow EN 1011-2. It gives complete details of welding requirements for steel. 

Regards,

Charles 

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[pgos...@rogers.com]

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....@gmail.com

 

 

From: material...@googlegroups.com <material...@googlegroups.com> On Behalf Of Charles Jacob
Sent: July 5, 2020 3:21 AM
To: material...@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 

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[Vishwas Keskar]

THANK YOU  ALL FOR RESPONSE .

 PL elaborate  following :

When  minimum T8/5  time is calculated   using SP472 formulae  for  PQR , then  how it is to be applied  for production welds ?

 There are various  diameter / thk involved in production.The WPS( thk etc) is  is covering production welds

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[Vishwas Keskar Welding Manager WELDING]

thanks experts

I gone thr EN1011 -  ANNEX -  D

Studied equations /figures 

Need following elaborations :

1)How to calculate Transition thickness - Formaulae ? 

2) What is significance of the transition thickness?

3)After calculation , what its use ,how it is to applied  to production joints , calculations

4)How and what to interpret  in Figures of D4, D5, D6 

Vishwas