Re: [MW:31999] Preheat temperature

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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