Materials & Welding

Please ignore earlier mail. Socking temperature 4.6meter long , more than 140°c heating temperature variations also not acceptable, it is as per Sec 8. Sent from Outlook for Android From:  venkateswara reddy Desireddy <dvreddy82@gmail.com> Sent:  Wednesday, December 31, 2025 5:52:24 pm To:  materials-welding@googlegroups.com <materials-welding@googlegroups.com> Subject:  Re: [MW:35939] PWHT for Piping weld joint | heating & cooling rate Chart is ok. It's meeting code. One more clause, in 4.5meter long , more than 40°c temperature variations also not acceptable. Sent from Outlook for Android From:  materials-welding@googlegroups.com <materials-welding@googlegroups.com> on behalf of Srinivas Gundala <srinivasrao.gundala@gmail.com> Sent:  Wednesday, December 31, 2025 4:56:22 PM To:  materials-welding@googlegroups.com <materials-welding@googlegroups.com> Sub...

Dear Sirs, As per ASME B31.3 clause no.341.3.1(a) mentioned P Nos.3,4,5A,5B,5C AND 15 materials examination(RT/UT) shall be performed after completion of heat treatment. But no information for P1 material whether NDT performed before or after PWHT. Please advise can we perform NDT(RT/UT) before PWHT activity for P1(NACE/H2 service) material or not. Regards, Ranajit Chatterjee 9995018265 -- 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/1766993169.S.607.21315.f5mail-224-227.rediffmail.com.1766993764.7778%40webmail.rediffmail.com .

Hi, For H2 service you have to NDT RT/UT after PWHT. Better to do hardens also. On Mon, 29 Dec 2025, 10:39 am 'ranajit chatterjee' via Materials & Welding, < materials-welding@googlegroups.com > wrote: Dear Sirs, As per ASME B31.3 clause no.341.3.1(a) mentioned P Nos.3,4,5A,5B,5C AND 15 materials examination(RT/UT) shall be performed after completion of heat treatment. But no information for P1 material whether NDT performed before or after PWHT. Please advise can we perform NDT(RT/UT) before PWHT activity for P1(NACE/H2 service) material or not. Regards, Ranajit Chatterjee 9995018265 -- 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 dis...

Just to share. As per ASME B31.3, PWHT is not mandatory for P! material provided certain conditions are fulfilled and not considered a service requirement. If it is a service requirement it is preferable to perform UT before PWHT & RT after PWHT since repair welds need PWHT if PWHT is a service requirement.. If it is ASME Sec.VIII Div.I, for P1 material as per UCS-56 Repairs are permitted after PWHT. Snap shot below. Thanks & Regards J.Gerald Jayakumar 0091-8838619635 On Monday, 29 December 2025 at 01:09:24 pm IST, 'ranajit chatterjee' via Materials & Welding <materials-welding@googlegroups.com> wrote: Dear Sirs, As per ASME B31.3 clause no.341.3.1(a) mentioned P Nos.3,4,5A,5B,5C AND 15 materials examination(RT/UT) shall be performed...

Just be specific to question. 1. NACE MR0175 do not require mandatory PWHT unless Hardness requirements are met. 2. NACE MR0103 for Refinery sour service & associated NACE SP0472 for environmental cracking do not mandate PWHT for sour service snap shot below. 2. For H2 service PWHT is not a mandatory requirement as material selection are governed by Nelson curves (API 941). PWHT for P1 material is optional and though if performed for P1 material due to service requirement (as dictated in the specification), UT/RT after PWHT is recommended for mainly Repair occurring after PWHT . Thanks & Regards J.Gerald Jayakumar 0091-8838619635 On Monday, 29 December 2025 at 01:09:24 pm IST, 'ranajit chatterjee' via Materials & Welding <materials-welding@googlegroups.com> wrote: ...

Dear Mr. Anthony, Black soot on Aluminized Mild Steel (ALMS) during MIG welding is a  very common issue, and it  typically indicates  that the Aluminium coating  is burning off and oxidizing not necessarily a weld  defect, but rather a process/parameter  & shielding issue. The soot is due to the vaporization  of the  Aluminium-Silicon coating and oxidation promotion due to  CO 2 .  So, reduce the CO 2 content. Try  92% Ar/8% CO ₂ (best balance) or  95% Ar/5% CO ₂ (almost no soot & very  clean arc). 98% Ar/2%  CO ₂  is the cleanest but may affect the weld bead finish. Further, for your 125A selection, 29.50V is too high and increases the heat input, and  the  vaporization  and tend to distort. The ideal  Voltage is between 20 to 22V. It will also help to reduce  the spatter  level.  Pulsed  MIG (if your power  source supports Pulse) with a lower average heat  input  gives cleaner  results  on ALMS. 12 LPM is on the borderline  for a  coated sheet, and increase ...

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...