Materials & Welding

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.murugam@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 < dvreddy82@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, < shivasankar2593@gmail.com > wrote: Hi Friends, Refer the attached image, In this, The cover flange thickness is 69.8 mm & The Nozzle...

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 essent...

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 M...

Can we use Duplex WPS for Super Duplex, kindly quote with the help of code Thanks -- https://materials-welding.blogspot.com/ https://www.linkedin.com/groups/122787 --- You received this message because you are subscribed to the Google Groups "Materials & Welding" group. To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com . To view this discussion visit https://groups.google.com/d/msgid/materials-welding/ee5dcbf4-b6cb-4421-8338-04e109d45b15n%40googlegroups.com .

Sir,  Not using .because filler,interpass temp.,etc are not same.DSS.  DSS. ER2209  SDSS ER2594    Thanks and regards,      S.KARUNAKARAN,         karunaqc@gmail.com       91-6382279754        On Mon, 15 Dec 2025, 16:29 Alex Kumar Antony, < alexkantony@gmail.com > wrote: Can we use Duplex WPS for Super Duplex, kindly quote with the help of code Thanks -- https://materials-welding.blogspot.com/ https://www.linkedin.com/groups/122787 --- You received this message because you are subscribed to the Google Groups "Materials & Welding" group. To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com . To view this discussion visit https://groups.google.com/d/msgid/materials-welding/ee5dcbf4-b6cb-4421-8338-04e109d45b15n%40googlegroups.com . -- https://materials-welding.blogspot.com/ https://www.linkedin.com/groups/122787 --- You received this message because you ar...

As per ASME Section IX, the use of SDSS filler wire is permitted even when impact testing is not specified or required, provided the essential variables are met. However, beyond the code requirements, from a metallurgical and performance standpoint, DSS and SDSS differ significantly in their ferrite-austenite phase balance requirements. Achieving the correct phase balance is critical and is strongly influenced by welding heat input. SDSS, in particular, has a higher PREN (Pitting Resistance Equivalent Number) requirement compared to DSS. To achieve the required PREN and phase balance in SDSS weld metal, nitrogen is commonly added to the shielding and backing gas. Nitrogen is a strong austenite stabilizer and also contributes to an increase in PREN, thereby improving corrosion resistance. If a WPS is qualified for DSS using pure argon as the shielding gas, and it is later proposed to use an argon–nitrogen mixture (for Eg: Ar + 2% N₂) for SDSS welding, this change would require requalifi...

As per ASME Section IX – QW-403.5: No, a change from one Group Number to another Group Number within the same P-Number shall be considered an essential variable and requires requalification of the WPS. On Mon, 15 Dec 2025, 16:29 Alex Kumar Antony, < alexkantony@gmail.com > wrote: Can we use Duplex WPS for Super Duplex, kindly quote with the help of code Thanks -- https://materials-welding.blogspot.com/ https://www.linkedin.com/groups/122787 --- You received this message because you are subscribed to the Google Groups "Materials & Welding" group. To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com . To view this discussion visit https://groups.google.com/d/msgid/materials-welding/ee5dcbf4-b6cb-4421-8338-04e109d45b15n%40googlegroups.com . -- https://materials-welding.blogspot.com/ https://www.linkedin.com/groups/122787 --- You received this message becau...

yes, provided that you have revised drawing. On Monday, December 15, 2025 at 4:29:07 PM UTC+3 Alex Kumar Antony wrote: Can we use Duplex WPS for Super Duplex, kindly quote with the help of code Thanks -- https://materials-welding.blogspot.com/ https://www.linkedin.com/groups/122787 --- You received this message because you are subscribed to the Google Groups "Materials & Welding" group. To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com . To view this discussion visit https://groups.google.com/d/msgid/materials-welding/c8d57c10-cfd4-4bca-8bed-493fc3badc51n%40googlegroups.com .

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. On Monday, December 15, 2025 at 9:14:44 AM UTC+3 Shivasankar A 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 -- https://materials-welding.blogspot.com/ https://www.linkedin.com/groups/122787 --- You ...

Yes P8 with dissimilar material thickness 6mm PQR thickness is enough to weld max thickness. On Mon, 15 Dec 2025, 2:36 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 ...

Yes you are right, shielding gas also one of the essential variables. Along with P number and F number other parameters also we have to consider before choosing WPS. On Mon, 15 Dec 2025, 7:35 pm Anandhapadmanabha pillaim, < anandhapadmanabhapillaim1997@gmail.com > wrote: As per ASME Section IX, the use of SDSS filler wire is permitted even when impact testing is not specified or required, provided the essential variables are met. However, beyond the code requirements, from a metallurgical and performance standpoint, DSS and SDSS differ significantly in their ferrite-austenite phase balance requirements. Achieving the correct phase balance is critical and is strongly influenced by welding heat input. SDSS, in particular, has a higher PREN (Pitting Resistance Equivalent Number) requirement compared to DSS. To achieve the required PREN and phase balance in SDSS weld metal, nitrogen is commonly added to the shielding and backing gas. Nitrogen is a strong austenite stabilizer and also...

Code-Based Explanation (ASME Section IX) 1. Base Material Grouping – P-Numbers ASME Section IX groups materials by P-Numbers to control essential variables. Duplex Stainless Steels (e.g., UNS S31803 / S32205) → P-No. 10H Super Duplex Stainless Steels (e.g., UNS S32750 / S32760) → P-No. 10I 📌 Since P-No. 10H ≠ P-No. 10I , they are treated as different base material groups . 2. Essential Variable for Base Materials ASME Section IX clearly states: QW-403.11 A change from one P-Number to another P-Number is an essential variable and requires requalification of the WPS. ✅ Therefore: A WPS qualified on Duplex (P-No. 10H) Cannot be used for Super Duplex (P-No. 10I) Without a new PQR covering P-No. 10I 3. Mechanical and Metallurgical Differences (Supporting Rationale) Although not strictly required by code, this reinforces why the rule exists: Super Duplex has: Higher PREN Higher yield and tensile streng...

Base material grouping is a supplymentary essential variable, even though it's a supplymentary essential variable, both DSS & SDSS have P 10H and Gr. 1. As per ASME SDSD WPS is permitted to write with DSS PQR, still impact testing is not there you want to use SDSS wire itself, yes it is permitted, if impact testing is there and you want to use SDSS wire, it's not permitted and requalification is required,  Below consideration I have addressed previous need to be taken into consideration,  However, beyond the code requirements, from a metallurgical and performance standpoint, DSS and SDSS differ significantly in their ferrite-austenite phase balance requirements. Achieving the correct phase balance is critical and is strongly influenced by welding heat input. SDSS, in particular, has a higher PREN (Pitting Resistance Equivalent Number) requirement compared to DSS. To achieve the required PREN and phase balance in SDSS weld metal, nitrogen is commonly added to the shielding a...

Please don't share wrong information both are P 10H Gr. 1 only refer QW/QB- 422 On Tue, 16 Dec 2025, 7:12 am Marco Nunes, < marcovsky82@gmail.com > wrote: Code-Based Explanation (ASME Section IX) 1. Base Material Grouping – P-Numbers ASME Section IX groups materials by P-Numbers to control essential variables. Duplex Stainless Steels (e.g., UNS S31803 / S32205) → P-No. 10H Super Duplex Stainless Steels (e.g., UNS S32750 / S32760) → P-No. 10I 📌 Since P-No. 10H ≠ P-No. 10I , they are treated as different base material groups . 2. Essential Variable for Base Materials ASME Section IX clearly states: QW-403.11 A change from one P-Number to another P-Number is an essential variable and requires requalification of the WPS. ✅ Therefore: A WPS qualified on Duplex (P-No. 10H) Cannot be used for Super Duplex (P-No. 10I) Without a new PQR covering P-No. 10I 3. Mechanical and Metallurgical Differences (Supporting Rati...

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: ...

Dear, ER70S6 filler wire suitable but the problem is more about surface chemistry of aluminized steel and gas composition than filler wire choice. My suggestion as below 1) Avoid pure Argon for MIG on steel—it can cause poor penetration and lack of fusion. 2) Change gas mix to 97% Ar / 3% O₂.This stabilizes the arc and reduces oxidation 3) Slightly increase gas flow i.e 14–16 L/min. 4) Use forehand (push) instead of pull to direct fumes away from the weld. Regards, Pravin Nimbalkar On Friday, April 1, 2022 at 5:11:22 PM UTC+5:30 Anthony Dalisay wrote: I thought of doing the same too, however, it will cost me down time to remove the surface aluminium of all the items (about 40k pieces). You are correct that it is natural tendency for aluminium to oxidize when diffused with the weld arc, although this seems to be illusive, would changing the gas flow rate(to higher), welding progression(from pull to push) and angle of torch and contact tip to work distance (CTWD) will help eliminate the ...