Preheat temperature

[EmaD FaRaHanI]

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,

[Vishwas Keskar]

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 

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[ishwar kumar]

Plz refer non mandatory appendix R 

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[Sankaran Sp]

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.

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[james gerald]

PWHT depends on condition and the selection of suitable welding consumable may be higher or lower P.No. It also depends on the P.No lower critical temperature and Tempering temperature and select buttering with Nickel consumable.

Thanks & Regards

J.Gerald Jayakumar

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[Kannayeram Gnanapandithan]

Is it not recommended to use higher side also

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