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Re: [MW:27514] Re: Impact Test for Procedure Qualification

By Materials & Welding
Hi
Thanks Mr. Prashant Panchal

Jibin

i would like to add  why the PQR 2 is not required as per that interpretation. hope my understanding is correct.


Just in brief ( Not much in to welding /metallurgical aspects )

1.When u weld 6 mm plate,  heat dissipation is faster than 25 mm plate, Meaning fast cooling occurs in 6 mm than 25mm thick weld. Effect of cooling rate is key point for impact values.  
2. By keeping all essential / supplementary variables same  , if 6 mm plate could pass in that  impact test , then there is no problem of passing 25 mm thick plate , Passing 6 mm presumed that it will pass 25mm thick too. 

so code allows to combine i believe.

There are many other factors also need to be studied to understand these interpretation. Arc energy ( heat input), Solidification, Final micro structures etc... 

 
So, U can qualify PQR 1 & 3 as said earlier and  make WPS 5 to 50 mm... 






On Mon, Mar 12, 2018 at 2:33 PM, Jibin Philip <jibinphilip123@gmail.com> wrote:
Thank you all for your valuable informations , 

Dear Ramesh ji ,

Can u elaborate more for the below comments ,

Qualify other PQR (2) with 12 mm thick , this will qualify 12 to 24 mm thk - 

this pqr can be avoided by using asme interpretations

Regards , 

jibin 

On Sunday, 11 March 2018 12:46:38 UTC+3, Jibin Philip wrote:
Dear All , 

Spec - ASME B31.3 (Ed : 2016)  & Sec IX (Ed : 2017) ,

For PQR-A106 GR B -  i have taken 6" pipe Thk - 10.97mm - with impact test

Q1) What will be the thickness range qualified is it 10.97 to 16.97 or 5 mm to 16.97 or 5 mm to 21.94.

Q2) If i need to qualify a WPS with Thk ranges 5 mm to 25mm which thickness need to be selected .

Regards , 

Jibin 

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