Hello Jignesh,
Please see below the recommendations from Metrode. As per API RP-582 or API TR-938C the options are Duplex 2209 or Austenitic 309L/309LMo. Both types of welding consumables would be good for procedure qualification.
You need to find out from your client " what's the specific ,so called bitter experience". If used properly both types of consumables are welder friendly.
Thanks.
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Specialist
Ontario, Canada
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of JIGNESH RANA
Sent: Tuesday, October 08, 2013 7:57 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:18880] Welding of Duplex SS (A 790 Grade S31803) P. No. - 10H to SS 304, P No. 8
Dear Mr. Jignesh
What is the end applcation of this joint ? What are the operating conditions ? What is the thickness of the parts to be joined ?
API 582 surely allows use of Austentic welding elctrodes of welding of dissimilar metals ( pno. 1 ) with Duplex mateiral. However, it also refers API 938 C for welding of duplex steel.
Client's bitter experience has to be quantified through their requirements, as part of project specification. It is also be noted that bitter experience may not be due to austentic welding electrode.
As per API 938 C , welding consumable for DSS to CS to be selected carefully, which preserves low carbon of DSS and required phase balance that assures mechically tough weld for intended application.
Yes, duplex is ideal candidate for this application. However, Austenitic electrodes had also given satisfactory results. ( clause no. 7. 2 of API 938 C )
Personnely, i feel the following may be done to prove your case to client.
1.0 The qualified procedure shall meet all the requirements of project welding specifications.
2.0 The hardness values, phase distribution and micro structure etc. shall be as per required proejct welding specifications.
3.0 Make sure absence of inter metallic phase, if post weld heat treated.
Cheers and update us on the issue.
regards,
Jignesh Rana
On Tue, Oct 8, 2013 at 11:02 AM, Jignesh Desai <jignesh.desai.met@gmail.com> wrote:
We have carried out PQR (ASME Sec IX) for Welding of Duplex SS (A 790 Grade S31803) P. No. - 10H to SS 304, P No. 8 by GTAW filler wire ER 309L. This filler wire is adopted as per API 582 and also after client approval on PWPS.--Now client is quoting that they have some bitter experience with ER 309L and insisting us to use GTAW filler wire ER 2209.Does any one have any past experience / literature for Welding of Duplex SS (A 790 Grade S31803) P. No. - 10H to SS 304, P No. 8 by GTAW filler wire ER 309LYour reply may possibly strengthen our case.
Regds/Jignesh
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