When is supplementary essential variable becomes Essential ?

[PK M]

Dears,

When does the supplementary essential variable become Essential ? 

thanks

[Manivannan p]

Supplementary Essential variable is to be considered and addressed in PQR/WPS when the WPS is qualified with CHARPY IMPACT test and whenever the material requires IMPACT TEST per code/standard.

Thanks,

MANIVANNAN.P

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[Vishwas Keskar]

When Notch Toughness requirements are specified, then supplementary essential variables become  Essential variable. 

Regards

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