Materials & Welding: RE: [MW:32959] Inconel 6625 Gr1

Wednesday, March 9, 2022

RE: [MW:32959] Inconel 6625 Gr1 - PQR tensile requirements

Some basic information on this alloy is provided here. If the alloy is of Grade 1 type, meeting the nominal UTS with ER-NiCr-Mo3 filler and matching SMAW electrodes may be difficult. This would NOT be an issue if the alloy is changed to Type 2,(Solution Annealed ) variety. Pleas find the relevant information as attached.

At the first place, I would like to know, what's the rationale behind choosing Type-1 alloy(Annealed) , strength/weight reduction?

Response would be appreciated.

Thanks.

P.Goswami.P.Eng, IWE.

Independent & Consulting Welding & Metallurgical Specialist

Cell/Whasapp- 1-905-979-3232

India( Mobile) Till 10th April- 91-8981917949

From: materials-welding@googlegroups.com <materials-welding@googlegroups.com> On Behalf Of TDK YOKESH
Sent: March 8, 2022 6:11 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:32958] Inconel 6625 Gr1 - PQR tensile requirements

Hi Balakriahnan,

I do have the same concern with Gr. 1 of UNS 6625 when welded with ERNiCrMo3 Kindly do reconfirm of grade again (Gr. 1 or Gr. 2) . Did you check if the filler manufacturer can retest the tensile properties and provide the as welded values? 785Mpa which is 95% of 827Mpa will suffice thd requirment. We do all weld tensile test for every batch we receive.

I hope the expert in this forum can guidw us to sort this out.

On Tue, Mar 8, 2022, 9:15 AM Balakrishnan Srinivasan <sbkay333@gmail.com> wrote:

Dear Experts,

Greetings for the day!!

I want to quality PQR for Base material UNS N06625 GR1 which has tensile property 827Mpa, ERNiCrMo-3 Fillerwire was selected based on API582 & ASME sec II C recommendations. The filler wire tensile value is 760Mpa.
In PQR tensile test result lies in between 760-827 Mpa. The obtained tensile value is not greater than the base metal. It can't fulfill the requirement of QW-153 (ASME SEC IX).
As stated above clause QW153.1.c, " the applicable section".

Are there any provisions to qualify with lower strength than base metal?.

Reference WPSs were approved based on the tensile value being greater than filler metal tensile value (UTS) 760 Mpa MIN (sec II C), But there we could not get explanations from the originators.

Please also refer, ASME-B 31.3 clause 328.3.1 (welding materials) & ASME sec VIII div1 QW-06 (non-mandatory guidelines for welding material selection.
Thank you
Balakrishnan S

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