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[MW:13567] RE: 13563] Interpret IX-04-15

By Materials & Welding
Because the supplementary essential variables must be met, the proposed WPS is not allowed - i.e. in QW-407.2 there is a maximum limit on time at temperature. Specifically, "The procedure qualification test coupon . . . at least 80% of the aggregate time at temperature."

Thus the maximum time (Tmax) at temperature is : (Tqual/Tmax) X 100 = 80

Or Tmax = Tqual X ( 100/80) = 1.5 hr X (5/4) = 1.875 hours

So the PQR does not have a long enough hold time to support the proposed WPS's 3.5 hour hold time.


John A. Henning
Senior Welding & Materials Engineer

-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of solomon
Sent: Tuesday, January 24, 2012 7:45 PM
To: Materials & Welding
Subject: [MW:13563] Interpret IX-04-15

Dear Expert
.
According to interpretation below could you please explain why the answer is "No". In my understanding WPS has change only time range but doesn't change in the temperature(logic "and" mean change both time and temperature).

In SEC IX QW-407.2 state that "A change in the postweld heat treatment (see QW-407.1) temperature and time range"

Interpretation: IX-04-15
Subject: QW-403.7, Base Metal Thickness Qualification and QW-407.2, PWHT Temperature and Time Range Date Issued: December 22, 2004
File: BC04-1595
Question (1): Will a procedure qualification test coupon on 1.5 in.
thick P-No. I, Gr. 2 material and
postweld heat-treated at I,lOO°F for 1.5 hr with supplementary essential variable requirements met, support a WPS with supplementary essential variable requirements for production welding on 8 in. thick P-No. 1, Gr. 2 material that is PWHT at l,lOO°F for 3.5 hr?
Reply (1): No

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