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Double-Sided Single-Pass Submerged Arc Welding for 2205 Duplex Stainless Steel

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Abstract

The duplex stainless steel (DSS), which combines the characteristics of ferritic steel and austenitic steel, is used widely. The submerged arc welding (SAW) method is usually applied to join thick plates of DSS. However, an effective welding procedure is needed in order to obtain ideal DSS welds with an appropriate proportion of ferrite (δ) and austenite (γ) in the weld zone, particularly in the melted zone and heat-affected zone. This study evaluated the effectiveness of a high efficiency double-sided single-pass (DSSP) SAW joining method for thick DSS plates. The effectiveness of the converse welding procedure, characterizations of weld zone, and mechanical properties of welded joint are analyzed. The results show an increasing appearance and continuous distribution feature of the σ phase in the fusion zone of the leading welded seam. The converse welding procedure promotes the σ phase to precipitate in the fusion zone of leading welded side. The microhardness appears to significantly increase in the center of leading welded side. Ductile fracture mode is observed in the weld zone. A mixture fracture feature appears with a shear lip and tears in the fusion zone near the fusion line. The ductility, plasticity, and microhardness of the joints have a significant relationship with σ phase and heat treatment effect influenced by the converse welding step. An available heat input controlling technology of the DSSP formation method is discussed for SAW of thick DSS plates.

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Acknowledgments

The authors gratefully acknowledge support from the State Key Lab of Advanced Welding and Joining (AWPT-Z02-2010), the Harbin Institute of Technology; the Fundamental Research Funds for the Central University (CDJRC11280002) and the Fundamental Research Funds for the State Key Laboratory of Mechanical Transmission (SKLMT-ZZKT-2012MS08), the Excellent Talents Project in Universities of Chongqing Municipal Education Commission; and the Sharing fund of Chongqing University’s large-scale equipment. The authors also thank Prof. Zhang YM, Mr. RAN Hanquan, Mr. CHEN Wei, and Mr. ZHANG Weijie for their helpful technical support and discussion.

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Luo, J., Yuan, Y., Wang, X. et al. Double-Sided Single-Pass Submerged Arc Welding for 2205 Duplex Stainless Steel. J. of Materi Eng and Perform 22, 2477–2486 (2013). https://doi.org/10.1007/s11665-013-0529-8

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  • DOI: https://doi.org/10.1007/s11665-013-0529-8

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