Re: [MW:26582] Re: QW 407.4 Clause requirement

Dear Vijay

I will share some of my experience

I) This discussion is ok for Non impact weld but for Impact/ UTS requirement the interpretaion will change on logical thinking

Ii)my experience for higher thk say for more than 60 mm D/E having seam  for P1 P4. (Normalsed base) material  do not satisfy the UTS (it detiorate)of. Weld  when multiple normalsing being carried during.D/E forming also  difficult to get consistant quality consumables

Iii)I prefer to have crown n petal type D/E for higher thk where we can avoid multiple NR

Regards

Hegde Prakash

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On Sun, 4 Jun 2017 at 15:33, Vijay Katkar

<katkar.vijay22@gmail.com> wrote:

Dear Prakash Sir,

But this interpretation says both the thickness. 

I agree with you that T (Base Metal) restriction has been given in QW 407.4 but this interpretation gives different meaning.

Thank you 

Vijay Katkar 

On 4 Jun 2017 9:32 a.m., "'Prakash Hegde' via Materials & Welding" <materials-welding@googlegroups.com> wrote:

Hi!

Yes weld metal does not come under preview of Qw 407.4 but there is restriction on base metal thk which is 1.1 time T  of test plate of PQR so indirectly autometicaly.applies to weld metal 

Incase of multiprocess PQR.undergoes NR and if the weld thk of each process is more than 19mm in such case each process weld thk qualifies to max thk equal to 1.1T of PQR test plate and  for weld less than 19mm it qualifies 2t of each process

Regards

Hegde Prakash

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On Sun, 4 Jun 2017 at 10:42, MW

<raghurambathula@gmail.com> wrote:

even some time interpretation needs interpretation??
in my opinion, QW 407.4 does not apply to weld metal thickness.

On Saturday, 3 June 2017 09:25:35 UTC+4, vijay Katkar wrote:

Dear Sir,

 

Need your help on following issue,

 

I have PQR with 88 mm thickness ( SMAW – 32 mm & SAW -56 mm)and it  has normalizing + stress reliving heat treatment. Generally it is used for dish end long seam (where fiber elongation is more than 5%).

 

As per QW 407.4 Base material thickness T will be qualified 1.1 times of test coupon thickness, in my case it will be 96 mm maximum and deposition thickness will be as per QW 451 table but shall not be more than base metal thickness. As per my assumption SMAW- up to 96mm & SAW- up to 96mm will qualify.

 

As per interpretation IX 83-102. Both thickness will qualify 1.1 times. It means that SMAW will qualify up to 35 mm & SAW -  61 mm. Is this interpretation valid as per latest code requirement?

 

 

I have attached interpretation copy for your reference.

Vijay Katkar 

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