Sorry for Belated response, thanks for the details given,
Usually with all these variables given, hardness should not increase more than 22 HRC, though my recommendation would be to increase Preheat temperature a bit if PQR allows to do so.
also please detail where and how much hardness obtained, if it is weld then definitely an increased Preheat is required, you can try a mock up test with increased Preheat also,
Regards
Manpreet Singh
On Sat, 05 Feb 2011 16:45:49 , "Vinod Kataria" <vinod.kataria@blissanand.com> wrote
Dear Manpreet,
Please note the required details as per the following in RED colour:-
* Welding Process – GTAW for Root and Filling with SMAW.
* Thickness of the materials (Dissimilar weld ?) – 4.5mm.
* Welding Technique– String, cup size 6mm, multipass, single electrode.
* Preheat temp. – 20 degree C min.
* Heat Input– 0.95 to 1.19 KJ/mm.
With kind regards,
Vinod Kumar Kataria
GM - Operations
Bliss Anand Private Limited,
92B/93B Sector 5
IMT Manesar,Gurgaon,
National Capital Region Delhi.
India .
Phone : +91-124-4366000 (9 Lines)
Mobile Phone : +91-9560199004
Fax : +91-124-2290884
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of manpreet
Sent: Saturday, February 05, 2011 7:58 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:9737] CS to SS welding
Dear Vinod,
Ok then, I would like you to provide some more info.
* Welding Process
* Thickness of the materials (Dissimilar weld ?)
* Welding Technique
* Preheat temp.
* Heat Input
Changes may be required for above stated factors (in lieu of PQR) to overcome this problem.
Regards
Manpreet Singh
On Sat, 05 Feb 2011 01:15:21 +0530 "Vinod Kataria" wrote
>
Dear Manpreet,
Thanks for your valuable time. Please note we have qualified PQR using Filler 309L only but so many time we are getting more than 22 HRC which is not acceptable as per Nace MR 0175.
With kind regards,
Vinod Kumar Kataria
GM - Operations
Bliss Anand Private Limited,
92B/93B Sector 5
IMT Manesar,Gurgaon,
National Capital Region Delhi.
India .
Phone : +91-124-4366000 (9 Lines)
Mobile Phone : +91-9560199004
Fax : +91-124-2290884
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of manpreet
>Sent: Friday, February 04, 2011 3:17 PM
>To: materials-welding
>Subject: Re: [MW:9727] CS to SS welding
Dear Vinod,
>
>When welding Carbon steel to stainless steel, one should avoid formation of martensite by using overalloyed filler metal (309L) which willformAustenite even when cooling,a Preheatingand using Temper bead technique would also be helpfull to reduce Hardness,
>
>Considerationmust be given to reduce High Dilution by reducing Travel Speed, buttering the joint face, no SAW etc.
>
>Also refer to the Shaeffler Diagram to evaluate what kind of microstructue you would expect, with filler metal E309L, you can expect "Austenite with little ferrite".
>
>Regards
>Manpreet Singh
>
>
>
>On Fri, 04 Feb 2011 13:18:26 +0530 "Vinod Kataria" wrote
>>
Hi,
How to control the hardness for NACE MR 0175 application if we have to use A-105 flanges on SS-316 Chamber as PWHT cannot be done.
With kind regards,
Vinod Kumar Kataria
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