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[MW:27276] PQR PMI - Fe value

By Materials & Welding

Hi Mohamed,

 

In addition to the response of Harish Kannepalli, some additional information may be of help.

·         Check the calibration and accuracy of the equipment used.

·         Whether it's OES or XRF, equipment precision and proper calibration is essential.

·         It's desired that the calibration block should match or be closer to the chemistry of the material being tested.

·         Also , the time of exposure, shorter exposure time for measurement could be erratic, and there could have variations in the reading.

·         It's advisable to take multiple reading with longer exposure time and then to report the average.

 

It would be good to know, if the suggestions as above solved your problem or not.

 

Thanks.

 

P.Goswami.P.Eng, IWE.

Welding & Metallurgical Specialist

Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/

Email:pgoswami@quickclic.net,pradip.goswami@gmail.com

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Harish Kannepalli
Sent: January 22, 2018 12:00 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:27275] PQR PMI - Fe value

 

Hi,

   Please consider testing Fe using OES, as PMI values are not reliable for pass/fail criteria.

Thanks & Regards,
Harish

 

On Jan 22, 2018 08:57, "Mohamed Ali" <marb8389@gmail.com> wrote:

Dear Experts 

 

can you advise me for the below clarifications,

 

We have Done the PQR as mentioned below material and after PQR the test piece measured the PMI value and all chemical composition are meet the Sec-2 C requirement except Fe value, please explain why it is happen and provide some technical data.

 

Base metal  - ASTM A312 TP 304L to ASTM A312 TP 304L

 

Electrode :  - ER NiCr-3

 

SFA 5.14 - Actual Fe - 3% Max  & measured value - 8.83%

 

 

 

Best Regards,

 

Mohamed Ali.

 

 

 

 

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