Saturday, November 13, 2010

Re: [MW:8240] SDSS Welding With High Heat Input

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 wrote
>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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Dear Sir,





Thanking You,

Honesty is the best Policy

With Warm Regards,

Muthu Barathi P
Mobile No:00962788269821 (Jordan)
00962775401951

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