Clarification on usage of WPS for Particular Joint Type

[Shivasankar A]

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

[Hai Tran Ngoc]

The joint between the cover flange and the nozzle neck is a groove joint. However, the maximum thickness qualified in the WPS (20.0 mm) does not comply with the nozzle neck thickness requirement (20.4 mm). Therefore, this WPS is not applicable to this joint.

PWHT is an essential variable, and the approved WPS must be followed. That means if a WPS qualified with PWHT is used, PWHT shall be performed in accordance with the WPS.

 

Thanks & Best Regards,

(Mr.) Hai, Tran Ngoc

E-mail: ngoch...@gmail.com
Telephone: +84-(0)977-881-880

Vào Th 2, 15 thg 12, 2025 lúc 13:14 Shivasankar A <shivasa...@gmail.com> đã viết:

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[venkateswara reddy Desireddy]

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.

[kavin murugam]

Dear DV Reddy,

T = base metal thickness

t = weld metal thickness

Did you WPS covers both thicknesses ?

Thank you & Stay Safe!

 

KAVIN MURUGAM +60126159644

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[Karunakaran Karan]

Dears,

  Welder Qualification it take maximum and WPS range takes Pipe thickness.ASME 

Sec ix

   Thanks and regards,

     S.KARUNAKARAN,
      karu...@gmail.com

      91-6382279754

      

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[Ramchandra Dutta]

Dear, Mr, Reddy,

Pl make WPS for 25 mm thk. which may cover always in all.

Regards.

R.C.DUTTA

JINDAL .

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[Anandhapadmanabha pillaim]

Inorder to cover dissimilar thickness welding, WPS has to cover the lower limit and upper limit, there is not upper limit if the WPS has been qualified for 38mm and Above. I have explained this on the basis of P No. 1, 3, 4, 5A, 5B,5C, 15E.

For P-No. 8, P-No. 41, P-No. 42, P-No. 43, P-No. 44,P-No. 45,P-No. 46, P-No. 51,P-No. 52, P-No. 53,P-No. 54, P-No. 61, P-No. 62, and P-No. 81  there is no limitations on maximum thickness, provided the PQR has been qualified on a 6mm thickness.

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[venkateswara reddy Desireddy]

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.

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[Shivasankar A]

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?

[Anandhapadmanabha pillaim]

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. 

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[Mohd Siraj]

if you want to use WPS up to 20mm, machined 0.4mm of nozzle. as nozzle always have excess thickness 0.8-1mm.

however your joint is 69.8 and 20mm so you must have wps qualified up to 69.8mm.

whats a nozzle dia, if inside welding possible, make double v groove  as per asme b16.25.

[venkateswara reddy Desireddy]

Yes P8 with dissimilar material thickness 6mm PQR thickness is enough to weld max thickness.

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[venkat chikkala]

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