Optimization of the Pulsed Gas Tungsten Arc Welding in Dissimilar Joining Austenitic Stainless Steel AISI 316L to Nickel-Base Super Alloy of Monel 400

Document Type: Persian

Authors

1 MSc , Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University,Najafabad,Iran.

2 Assistant Professor, Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University,Najafabad,Iran

3 Professer, Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University,Najafabad,Iran.

Abstract

In this research, optimization of the pulsed gas tungsten arc welding including pulse current, background current, pulse frequency and on time were investigated in welding of non-similar materials of austenitic stainless steel AISI 316L and nickel-base super alloy of Monel 400 by using ERNiCr3 filler metal. In order to obtain optimum conditions of welding the Taguchi method with the L9 array was used. The mechanical properties such as bending, tesile test and hardness test were performed on the samples and after that analysis of the variance was performed. By predicting optimal conditions, the proposed model was examined and the results of computational analysis shows a significant similarity with results of the experiment. Optimal parameters of pulsed tungsten arc welding were the pulse current of 140 mA, background current of 60 mA, pulse frequency of 3 Hz and the ON periods of pulse was 50%. The optimized sample with the Taguchi method and the welded sample shows the similarity of 98.7%. Pulse current percentage of 23.4 and pulse frequency of 28.2 were identified as the most influential parameters during the welding. Tensile test results showed that the failure occurs on the side of the base metal on Monel 400 one and hence the failure is the ductile one. These results show the strength of the weld metal confirmed the tensile and bending tests

Keywords


[1] Lippold.Jonch, welding metallurgy and weldability of stainless steels, trans by Shamanian. Morteza, Rahmati.  Mohammad, Esfahan univercity of technology,2008.

 [2] John N.DuPont,John C.Lippold, Samuel D. Kiser, Welding Metallurgy and Weldability Of Nickel-base Alloys, trans by: Shamanian. M, Purmohamadi. H, Amini.M, Mostafaey.M, Esfahan Univercity Of  Esfahan,2013.

[3]Tseng K.H., Chou C.P., The Effect of Pulsed GTA Welding on The Residual Stress of a Stainless Weldment. Journal of Materials Processing Technology, Vol.123, 2002, PP. 346-353.

[4]H.R.Zareie, M.Shamanian, “Effects of pulsed GTA Welding on Microstructure and Mechanical Properties of AISI 316 Stainless Steel Welds", IIW International Congress on

Welding &Joining, 30 November- 03 December 2009, pp.452-460, Iran.

[5]Narayanan, S. Ramkumar, K. Devendranath." High temperature corrosion behavior of PCGTA weldments of Monel 400 and AISI 304 exposed in the molten salt environment at 600°c" International Journal of ChemTech Research;May/Jun2014, Vol. 6 Issue 3, p1775.

[6] N.Karunakaran" Effect of Pulsed Current on Temperature Distribution, Weld Bead Profiles and Characteristics of GTA Welded Stainless Steel Joints"Department of Mechanical Engineering, Annamalai University, Annamalai Nagar – 608002, India

 [7] ANSI/AWS A5.9/A5.9M, " Specification For Bare Stainless Steel Welding Electrodes And Rods, 2nd Printing", American Welding Society, Edistion 7th, 2007.

 [8] ANSI/AWS A5.14/A5.14M, " Specification for Nickel and Nickel-Alloy Bare Welding Electrodes and Rods-Includes Errata", American Welding Society, Edition: 9th 2009.

[9] ASME Sec IX, "Qualification Standard for Welding and Brazing Procedure", Article II, Welding Procedure Qualification, American Society of Mechanical Engineers, Edition: 2th,   2001.

 [10] www.millerwelds.com. TIG Handbook, miller welding company.

[11] Active Standard ASTM B127 | Developed by Subcommittee: B02.07”Standard Specification for Nickel-Copper Alloy (UNS N04400) Plate, Sheet, and Strip” Book of Standards Volume: 02.04

[12] ASTM A240 Stainless Steel” ASTM A240 standard specification for chromium and chromium-nnickel stainless steel plate, sheet, and strip for pressure vessels and for general applications” Supplementary Technology:   HIC Test | NACE MR0175 | Z15 | Z25 | Z35 | S1 | S2

[13] AWS 5.14 Class ERNiCrMo-3 / ASME SFA 5.14 Class ERNiCrMo-3,” MIDALLOY ERNiCrMo-3 nickel alloy bare wire is used for GMAW, GTAW, and SAW welding”.

[14] H. Shah Hosseini, M. Shamanian, A. Kermanpur, "Characterization of microstructures and mechanical properties of Inconel 617/310 stainless steel dissimilar welds",Materials Characterization,Vol.62, pp. 425-431, 2011.