Mr. Jubir
Whether PMI was done before PWHT or after PWHT?
If results are from before PWHT, then there is something wrong in fillter metal, might be wrong fillter used.
If PMI done after PWHT, then you can weld sample joints again, and do PMI before and after PWHT and analyse the results.
Alternatively, you can try with other PMI isntruments, even you can go for Lab chemical analysis of few joints to ascertain some conclusion.
Thanks
Murugesan
On Fri, Aug 31, 2012 at 12:19 AM, c sridhar <sridhar305@yahoo.com> wrote:
--Mr. Jubir,Noted the points mentioned by you. If the filler materials were pre checked and found to be OK for its chemistry, then there can not be any reason for such a drastic change in the post weld chemistry, i.e., from 9% to 4%.
The pre, inter pass, post heat or PWHT temp. as mentioned by you are all within the stipulated range and can not be a reason either.
All the 800 joints can not go wrong at a time unless something happened drastically. Have a random check (date wise fabrication) again and find if the Cr. deficiency is same with all the joints. It may give an insight and may lead to a conclusion.
regards,Sridhar.
From: mohamed jubair <kmd.jubair@gmail.com>
To: materials-welding@googlegroups.com
Sent: Thursday, 30 August 2012 1:49 PM
Subject: Re: [MW:15164] Problem about Positive material Identification(PMI)
Dear Mr. SridharThanks for your suggestion.Please understand my point. The filler wire readings mentioned in the table(trailing mail) is not from the manufacture's test certificate but from Positive material identification(PMI). In PMI test two parent metals,filler wire showing positive values as T91 but weld metal only not conforming as T91.We procured other two new batch filler wires from the same manufacturer,welded and checked. It shows positive material for all the four(two parent metal,weld metal,filler wire) as T91.RegardsJubair
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