[MW:20438] RE: 20427] Welding of Super Duplex SS

Hi Hrushikesh,

SUS 329J4L(Nearest UNS 32506) is relatively an uncommon SDSS. Only the manufacturer and a few other handful suppliers will be versed with it. Due to higher contents of Cr and W (if used in the heat ), both of which are strong ferritizers, this steel will have more tendency to form more ferrite in the weld metal.

The ideal SMAW consumable & GTAW filler metal for welding such steel would be E/ER-2593 or 2594. The product used by your organization, Weld TIG 329J4L conforms to ER 2594 specification.

Welding precautions for this steel, including heat input control, interpass control should be similar to the other DSS and SDSS. Amongst Indian welding consumable manufacturers D&H seems to manufacture matching product for this steel.

There's nothing wrong in using 2% Nitrogen in shielding gas.This is an universal practice to compensate for the Nitrogen loss from the weld metal during welding and solidification. This is usually compensated by adding Nitrogen in the shielding gas so as to maintain the desired Ferrite: Austenite ratio.

As advised by the others also, I would say, change the shielding gas on discussion with your client and then see how it goes.

FYI I've attached the extract from a lecture of Dr D. Kotecki (who's an authority on these steels). This lecture was organized by Indian Institute of Welding in 2006. It tells the various pros and cons of DSS/SDSS welding.

Hope this would be of help.

Appreciate if you could keep us in the loop on the further outcome.

Thanks

Pradip Goswami, P.Eng,IWE

Welding & Metallurgical Specialist

Ontario, Canada

pgoswami@quickclic.net

pradip.goswami@gmail.com

pradip_goswami@yahoo.ca

AWS SFA-5.4

D&H Products.

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Hrushikesh Sangamnerkar
Sent: Friday, March 28, 2014 12:22 PM
To: materials-welding@googlegroups.com
Subject: [MW:20427] Welding of Super Duplex SS

Hi all,

Base Metal: SUS 329J4L

Filler Metal: WEL TIG 329J4LT

Process: GTAW

Ferrite required (%Fe): 30-55%

Presently the ferrite obtained is on higher side.

%Fe=60-65.

Wanted good welding practice if any one worked with this material. Kindly help with some literature for the same.

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Hrushikesh H Sangamnerkar

09724738118

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