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Re: [MW:35930] Clarification on usage of WPS for Particular Joint Type

By Materials & Welding
Dear,

1) Your provided WPS is not acceptable for welding the 69.8 mm thick cover flange to the 20.4 mm thick nozzle.

Per ASME Section IX QW-202.4 (Dissimilar Base Metal Thicknesses), the thinner member (nozzle at 20.4 mm) must fall within the qualified range of QW-451. Your WPS qualifies only 1.5 mm to 20 mm, which excludes 20.4 mm.

A WPS qualifying the thinner member thickness (≥20.4 mm) may be used, provided all essential and supplementary essential variables as applicable are met, and base metals fall within P-No. groups: 8, 41–46, 51–54, 61, 62, or 81. 

2)  PWHT is essential Variable hence A WPS with PWHT will not qualify to weld production joint with out PWHT.

 
Regards,
CH V Ramana


On Monday, 15 December 2025 at 11:44:29 am IST, Shivasankar A <shivasankar2593@gmail.com> wrote:


Hi Friends,

Refer the attached image,

In this, The cover flange thickness is 69.8 mm & The Nozzle thickness is 20.4 mm. 

the Nozzle is Set on on the Cover Flange with Full penetration Weld the groove is given on the Nozzle pipe.

The Final Fillet weld Size is 15 mm.

So may i use the WPS which Covers the thickness range from 1.5 to 20 mm?

If not, Kindly explain why?

Also Tell me the WPS Qualified with Heat treatment can be weld for the Job without Heat Treatment?

Looking for your valuable Replies. Kindly Support.

regards,
A.Shivasankar


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