ENG  Vol.11 No.9 , September 2019
Mechanical Properties for Circumferential Welding Applied to UNS S32750 Super Duplex Stainless Steel Using the GMAW Process with CMT Control
Abstract: Super Duplex Stainless Steel has been studied for oil and gas industry applications since the 90 s, but their welding always is a technical issue. Then different methods were developed to meet all requirements presents in ASME standards, where most of are applied for lower production, when compared to other materials such carbon steel. This study accomplished circumferential welding experiments in base material (BM)—UNS S32750 Super Duplex Stainless Steel with a thickness of 3.68 mm. Welding was performed using GMAW (Gas Metal Arc Welding) process with CMT (Cold Metal Transfer) control and the aid of a Motoman robot and a turntable device, which were used to ensure the accurate positioning of the torch and that the welding has been fully implemented in the 1 G position, respectively. This process achieves higher production in relation other welding process usually applied for this material class. The joints which presented adequate dimensional results were, then, subjected to tensile and hardness Vickers tests. To avoid the lack of penetration problem, the welding was performed using the CMT process combined with pulsed arc, thus, resulting in full penetration and improved surface finish. The results have shown that the CMT procedure, combined with pulsed arc, led to an adequate superficial finishing, mechanical properties and corrosion resistance in accomplishment with the requirements presented in applicable standards.
Cite this paper: Invernizzi, B. , Silva, L. and Neves, M. (2019) Mechanical Properties for Circumferential Welding Applied to UNS S32750 Super Duplex Stainless Steel Using the GMAW Process with CMT Control. Engineering, 11, 576-591. doi: 10.4236/eng.2019.119040.

[1]   ASTM A249 (2008) Heat Exchanger and Condenser Tubes. American Society for Testing and Materials.

[2]   ASTM A269 (2008) Stainless Steel Mechanical Tubes Welded Stainless Steel Boiler Superheater. American Society for Testing and Materials.

[3]   ASTM A270 (2003) Sanitary Stainless-Steel Pipe. American Society for Testing and Materials.

[4]   ASTM A312 (2008) Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless-Steel Pipes. American Society for Testing and Materials.

[5]   ASTM A213 (2008) Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes.






[11]   ASME (2009) ASME Secção BPE Bioprocessing Equipment.

[12]   ASME (2007) ASME Secção IX ASME Boiler & Pressure Vessel Code.

[13]   Revision, R. (2012) ASME B31.3 Process Piping Guide.

[14]   Vander Voort, G.F. (1998) ASM Handbook Vol. 9: Metallography and Microstructures. ASM International, Geauga County, OH.

[15]   Martins, M. and Casteletti, L.C. (2005) Caracterização microestrutural do aço inoxidável super duplex ASTM a 890 Grau 6A. 12 CONAF-Congresso de fundição, de 27 a 30 de Setembro de, São Paulo.

[16]   Tavares, S.S.M., Pardal, J.M., Lima, L.D., Bastos, I.N., Nascimento, A.M. and De Souza, J.A. (2007) Characterization of Microstructure, Chemical Composition, Corrosion Resistance and Toughness of a Multipass Weld Joint of Super Duplex Stainless Steel UNS S32750. Materials Characterization, 58, 610-616.

[17]   Sandvik (2008) Sandvik Seamless Heat Exchanger Tubing. S-154-ENG. 03.2008.

[18]   ASTM A923 (2008) Standard Test Methods for Detecting Detrimental Intermetallic Phase in Duplex Austenitic/Ferritic Stainless Steels.

[19]   ASTM E384 (2016) Standard Test Method for Microindentation Hardness of Materials.

[20]   Roldão, A.M.B. (2010) Estudo do efeito do aporte térmico nas propriedades mecanicas e microestruturais do aço inoxidável duplex UNS S31803 em chapa grossa, soldada pelo processo GMAW.

[21]   Hasselberg, T.P. (2009) A Feasibility Study of “Cold Metal Transfer”-Gas Metal Arc Welding (CMT-GMAW) Nickel Base Superalloy Inconel 718TM.

[22]   Lippold, J.C. and Kotecki, D.J. (2005) Welding Metallurgy and Weldability of Stainless Steels. John Wiley & Sons, Inc., Hoboken, NJ, 357 p.

[23]   Tedeschi, P.A.L., Signorelli, R. and das Neves, M.D.M. (2010) Comparação da junta soldada pelo processo GTAW dos aços inoxidáveis AISI 316L e Super-Duplex UNS S32750 para trocadores de Calor Usados em Refinarias de Petróleo. XXXVI CONSOLDA-Congresso Nacional de Soldagem, Recife, PE, Brasil.