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 mamufacturer 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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