PQR for dissimilar material with dissimilar thickness.

[Anandh Kumar]

Dear experts,
I seek ur advice on the subject. The details as follows,
We are supposed to do a nozzle extension internally on a vessel of 57 mm thick shell (shell material A516 gr. 70) which requires impact testing. The pipe used is 316L of thickness 3.76 mm. How many PQRs will be required to cover the thickness range with all pthee essential variables as identical.

Regards
Anandh kumar

[VISHNUDAS MAVUNKASHERY]

i thnk above 13 mm thickness..it will get qualified for unlimited thickness

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VISHNUDAS MURALI MAVUNKASHERY

[Prasad Rode]

Dear sir,
What is existing pipe thickness, to which extension has to do.

Regards
Prasad

[Anandh Kumar]

The existing nozzle is a forged fitting which was welded to the shell wall having the same thickness of 57 mm.

Regards

Anandh

Prasad

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[dilintas]

Could you please send a sketch?

Sent from my Samsung Galaxy smartphone.

-------- Original message --------

From: Anandh Kumar <anan...@gmail.com>

Date: 15/02/2017 07:04 (GMT+02:00)

To: material...@googlegroups.com

Subject: [MW:26073] PQR for dissimilar material with dissimilar thickness.

Dear experts,
I seek ur advice on the subject. The details as follows,
We are supposed to do a nozzle extension internally on a vessel of 57 mm thick shell (shell material A516 gr. 70) which requires impact testing. The pipe used is 316L of thickness 3.76 mm. How many PQRs will be required to cover the thickness range with all pthee essential variables as identical.

Regards
Anandh kumar

--

http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
---
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[George Dilintas]

the qualification on a 13 mm thick sample with more than 3 layers applies to welder performance and not to PQR.

If the weld is a branch weld, then you have no a dissimilar thickness issue.

You should have a dissimilar thickness situation in case of a butt weld

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CAK8EmDTf2oGfMnTg5uR5q7o%2B3jOoDs0nfAYrmpvQ1agzMrgf%2BQ%40mail.gmail.com.

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Dr. Georgios Dilintas,

Dipl. Ing. In Aeronautic and Space Engineering

Ph.D in Mechanics of Solids - Computational Mechanics

A.I.S, A.N.I, IRCA Lead Auditor

Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis

[Prasad Rode]

See pqr qualification range in sec ix, it guide, u for pqr thickness qualification.