ENG  Vol.2 No.7 , July 2010
Dissimilar Welding of Superduplex Stainless Steel/HSLA Steel for Offshore Applications Joined by GTAW
Abstract: The dissimilar metal weld is demanding as well as the similar weld, however, dissimilar weld is more complex than similar weld due to the necessity of being applied in zones where a requirement is to improve some properties. In this work the main purpose is to know the mechanical behavior of a dissimilar weld between HSLA Steel and Superduplex Stainless Steel (SDSS) to establish if the joint is feasible or not. The alloys were welded with GTAW process using a 60-deg and 90-deg single-V groove test specimens in order to observe the effect of the weld pass. The filler metal was chosen with the aid of Schaeffler diagram. It was found that the ER 25.10.4L filler metal provided the best equilibrium between ferrite and austenite phase in the Superduplex Stainless Steel final microstructure and a band of martensite in the HSLA steel final microstructure. The dissimilar joint presented acceptable mechanical properties which are superior to the HSLA in the as-received condition, but lower than the SDSS in the as-received condition, proving that the filler metal was the adequate.
Cite this paper: nullB. Mendoza, Z. Maldonado, H. Albiter and P. Robles, "Dissimilar Welding of Superduplex Stainless Steel/HSLA Steel for Offshore Applications Joined by GTAW," Engineering, Vol. 2 No. 7, 2010, pp. 520-528. doi: 10.4236/eng.2010.27069.

[1]   PEMEX, “Tubería de acero para recolección y transporte de hidrocarburos,” NRF-001-PEMEX-2007 México, 2007.

[2]   J. J. Perdomo, J. J. Gonzalez and A. Viloria, “Corrosion of API 5L and X52 in Crude Oil/Water/Gas Mixtures,” Materials Performance, Vol. 39, No. 2, 2000, pp. 76-79.

[3]   PEMEX, “Sistema de protección del ducto ascendente en la zona de mareas y oleaje,” NRF-177-PEMEX-2007, México, 2007.

[4]   O. Smuk, H. Hanninen and J. Liimatainen, “Mechanical and Corrosion Properties of P/M-HIP Super Duplex Stainless Steel after Different Industrial Heat Treatments as Used for Large Components,” Materials Science and Technology, Vol. 20, No. 5, 2004, pp. 641-644.

[5]   F. Elshawesh, N. Elahresh and A. Elhoud, “Effect of Sigma Phase on Pitting Corrosion 22-5 Duplex Stainless Steel,” British Corrosion Journal, Vol. 33, No. 4, 1998, pp. 285-287.

[6]   Y. H. Lee, K. T. Kim, Y. D. Lee and K. Y. Kim, “Effect of W Substitution on Sigma and Chi Phase Precipitation and Toughness in Duplex Stainless Steels,” Material Science and Technology, Vol. 14, No. 8, 1998, pp. 757- 764.

[7]   R. Francis, “Coupling of Super Duplex Stainless Steel and Cast Nickel-aluminium Bronze in Sea Water,” British Corrosion Journal, Vol. 34, No. 2, 1999, pp. 139-145.

[8]   A. A. El-Yazgi and D. Hardie, “Effect of Heat Treatment on Susceptibility of Duplex Stainless Steel to Embrittle-ment by Hydrogen,” Materials Science and Technology, Vol. 16, No. 5, 2000, pp. 506-510.

[9]   V. Amigo, V. Bonache, L. Teruel and A. Vicente, “Me-chanical Properties of Duplex Stainless Steel Laser Joints,” Welding International, Vol. 20, No. 5, 2006, pp. 361-366.

[10]   V. V. D. Mee, H. Meelker and R. V. D. Schelde, “How to Control Hydrogen Level in (Super) Duplex Stainless Steel Weldments Using the GTAW or GMAW Process,” Welding Journal, Vol. 78, 1999, pp. s7-s14.

[11]   E. J. Barnhouse and J. C. Lippold, “Microestruc- ture/Property Relationships in Dissimilar Welds Between Duplex Stainless Steels and Carbon Steels,” Welding Journal, Vol. 77, No. 12, 1998, pp. s477-487.

[12]   H. Hemmer and O. Grong, “A Process Model for the Heat-affected Zone Microstructure Evolution in Duplex Stainless Steel Weldments: Part I. The Model,” Metallur-gical and Materials Transaction A, Vol. 30A, No. 11, 1999, pp. 2915-2929.

[13]   T. W. Nelson, J. C. Lippold and M. J. Mills, “Nature and Evolution of the Fusion Boundary in Ferritic-Austenitic Dissimilar Weld Metals, Part 1-Nucleation and Growth,” Welding Journal, Vol. 78, No. 10, 1999, pp. s329-s337.

[14]   D. J. Kotecki, “A Martensite Boundary on the WRC 1992 Diagram Part 2: the Effect of Manganese,” Welding Journal, Vol. 79, No. 12, 2000, pp. s346-s354.

[15]   J. C. Lippold and D. J. Kotecki, “Welding Metallurgy and Weldability of Stainless Steels,” Jhon Wiley & Sons, New Jersey, 2005.

[16]   H. Granjon, “Fundamentals of Welding Metallurgy,” Abington Publishing, Cambridge, 1991.

[17]   H. K. D. H. Badeshia and R. W. K. Honeycombe, “Steels,” 3rd Edition, Butterworth-Heinemann, Oxford, 2006.

[18]   S. Henrik and R. Sandstr?m, “Austenite Reformation in the Heat-affected Zone of Duplex Stainless Steel 2205,” Materials Science and Engineering A, Vol. 418, No. 1-2, 2006, pp. 250-256.

[19]   K. Bekker, “Practice in Welding Duplex and Super Duplex Stainless Steel Worldwide,” Welding in the World, Vol. 36, 1995, pp. 111-123.