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Re: [MW:35918] Clarification on usage of WPS for Particular Joint Type

By Materials & Welding
Yes you can weld any dissimilar thickness on p no. 8 of you have 6mm qualified PQR. Lower limit has to cover upper limit is sufficient even if you have a 6mm qualified PQR. 

On Mon, 15 Dec 2025, 3:36 pm Shivasankar A, <shivasankar2593@gmail.com> wrote:
Based on your advises, If i have a WPS with 6mm thickness in P.No 08, it allows to weld any thickness (from 1.5mm onwards) of P.No 8 materials Even in Dissimilar base material thickness Joints too. is my understanding is right?

On Monday, December 15, 2025 at 4:08:04 PM UTC+5:30 venkateswara reddy Desireddy wrote:
As per Sec IX QW 202.4 (b) (2) Dissimilar base metal 
PQR base metal thickness minimum 38mm required to get unlimited thickness.

69.8 mm here max range

WPS 5mm to 76mm required.


On Mon, 15 Dec 2025, 10:51 am kavin murugam, <kavin....@gmail.com> wrote:
Dear DV Reddy,
T = base metal thickness
t = weld metal thickness

Did you WPS covers both thicknesses ?

Thank you & Stay Safe!

 

KAVIN MURUGAM

+60126159644



On Mon, Dec 15, 2025 at 3:44 PM venkateswara reddy Desireddy <dvre...@gmail.com> wrote:
Dear friend,

Nozzle thickness 20.4mm, so your WPS thicknes must be cover 20.4mm. 20mm thick WPS not suitable to use, because 0.4 mm less thick .

Heat treatment is essential variable for WPS. If you use with heat treatment WPS, you have to do heart treatment to job also.


Regards 
D.V.Reddy.


On Mon, 15 Dec 2025, 9:14 am Shivasankar A, <shivasa...@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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