Thursday, February 25, 2021

Re: [MW:32003] Preheat temperature

Is it not recommended to use higher side also

On Thu, Feb 25, 2021, 8:45 AM 'Sankaran Sp' via Materials & Welding <materials-welding@googlegroups.com> wrote:
Dear friend,

when ever joining of two different P nos ( 5A+4) welding, following points to be  taken care :
1, Pre heating temp shall be maintained as higher Pno ( 5A)
2, PWHT  temp shall be maintained as per higher Pno(5A)
3, Consumable shall be maintained as per lower Pno( 4)




Regards,
Sankaran.SP
Welding & Metallurgy expert.


On Wednesday, 24 February, 2021, 03:17:21 pm IST, Vishwas Keskar <vvkeskar123@gmail.com> wrote:


Apply the rules applicable for Higher P.No. of the two materials  being welded.
P no 4 to P No 5A _ Apply criteria for P NO 5A materilas.  Also consider pre heating addresed in WPS 

On Wed, 24 Feb 2021, 07:13 EmaD FaRaHanI, <emad.farahani@gmail.com> wrote:
Hello all,
As Per ASME Sec VIII, appendix R preheat criteria are determined for different PNumbers. 
But in case of welding of one BM from PNumber A to PNumber B, how can we determine the preheat criteria (temperature and thickness)?

Thanks,

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