Effect on the Microstructure and Mechanical Properties of the Electromagnetic Stirring during GMA Welding of 2205 DSS Plates

Abstract:

Plates, 6.3 mm thick, of 2205 duplex stainless steel (DSS) were gas metal arc welded (GMAW) under the application of an axial magnetic field (0 to 15 mT) with an ER-2209 filler wire using a gas mixture of 98%Ar + 2%O₂. Microstructural characterization of the welds revealed that electromagnetic stirring (EMS) increases the content of austenite in both weld center and high temperature heat affected zone (HTHAZ). It induced a grain refining effect during freezing of the ferritic matrix which in turn enabled more sites for nucleation of austenite. This mechanism of solidification was reflected in an increase in the mechanical strength of the welds. Besides, the extent of the HTHAZ was reduced and its microhardness increased when applying the external magnetic field. It is believed that the vibration induced in this region favored the regeneration of austenite in the ferritized HTHAZ enhancing the balance of phases.

• Periodical: Materials Science Forum (Volume 755)
• Pages: 61-68
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.755.61
• Online since: April 2013
• Authors: Marco Arturo García Rentería, Víctor Hugo López Morelos, Rafael García Hernández, Francisco Curiel López, José Lemus-Ruíz
• Keywords: Austenite Regeneration, Duplex Stainless Steel Welding, Electromagnetic Stirring, Grain Refinement, Heat Affected Zone Reduction

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