Dear Limesh,
Thanks for your information regarding welding of DSS with SAW process.
one thing i would like to tell you. S31803 is not SDSS. it is Duplex material. if you are going to use more heat input with Super Duplex you can't get good result in CPT. Normally we dont have any probelm with Duplex Material. But when u are going to perfrom welding in Super Duplex S32750. You have to be very careful about its Heat Input between 0.5 KJ/mm to 1.5 KJ/mm and its Interpass temperature not more than 100 deg in root and hot & not more than 150 degree rest of weld. the main criteria is Argon with 2% of Nitrogen purging. These are the main factor which is to be consider while welding on SDSS.
Guys if you have any deviation above comments. let me know.
Ramkumar.J
---------- Forwarded message ----------
From: muthu barathi <muthu_barathi@rediffmail.com>
Date: Sat, Nov 13, 2010 at 11:56 AM
Subject: Re: [MW:8240] SDSS Welding With High Heat Input
To: materials-welding@googlegroups.com
HI mr LIMESH,
thanks a lot for your valued information. It may help a lot of peoples to rethink about welding parameters .
On Sat, 13 Nov 2010 09:57:47 +0530 wroteDear Sir,
>Dear All,
I heard that SDSS material shall be welded with a heat input range of 0.5 KJ/mm to 1.5 KJ/mm .Many client specification insisting us to follow this.Recently I got a chance to read one journal regarding SDSS welding with high heat input by SAW process.The result of the study was pretty good.But my client's welding expert says, if the heat input goes above 1.5 KJ/mm,microstructure changes will occur.Experts,what is your opinion on this matter.
Corrosion resistance of SAW duplex joints welded with high heat input
J. Nowacki*, P. Rybicki
Institute of Materials Science and Engineering, Szczecin University of Technology, Al. Piastow 19, 70-310 Szczecin, Poland
Received 19.03.2007; published in revised form 01.08.2007
Abstract
Purpose: test if the welding heat input exceeding the recommended values has negative impact on strength properties and corrosion resistance of the executed welded joints as well as description of influence of the heat input of submerged arc welding (SAW) of duplex steel UNS S31803 (0.032%C, 23.17%Cr, 9.29%Ni, 3.48%Mo, 0.95%Mn, 0.7%Si, 0.16%N, 0.017P, 0.006%S, 0.11%Cu) on welded joints microstructure, particularly average values of ferrite volume fraction, mechanical properties, and corrosion resistance.
Design/methodology/approach: analysis of welding heat input influence on mechanical properties, value of ferrite share, and corrosion of test joints has been done. Non-destructive and destructive testing, e. g. visual examinations, microstructure examination, corrosion resistance tests according to ASTM G48 Method A, HV5 hardness tests, impact and tensile test were carried out. For analysis of welding heat input influence on creation of welding imperfections, there were executed welding of sheet of thickness 9, 14, 28 mm. Butt joints on plates of different thickness were made where the applied heat input of welding exceeded the 2.5 kJ/mm value. Maximum heat input level was HI ≤ 3.0; HI ≤ 3.5; HI ≤ 4.0; HI ≤ 4.5; HI ≤ 5.0.
Findings: based on the performed tests the conclusion is that according to DNV Rules the welding heat input exceeding the recommended values has no negative impact on strength properties and corrosion resistance of the executed welded joints. It was shown that submerged arc welding of duplex steel with the heat input from 2.5 kJ/mm up to 5.0 kJ/mm has no negative influence on properties of the joints.
Research limitations/implications: the welding heat input exceeding the recommended values may influenced the precipitation processes in the HAZ, what need further experiments.
Practical implications: application of high value of the welding heat input will be profitable in terms of the welding costs.
Originality/value: an original value of the paper is to prove that a usage of high value welding heat input provides the best joints quality.
Regards,
Limesh
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Thanking You,
Honesty is the best Policy
With Warm Regards,
Muthu Barathi P
Mobile No:00962788269821 (Jordan)
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