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Analysis of Formation and Interfacial WC Dissolution Behavior of WC-Co/Invar Laser-TIG Welded Joints

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Abstract

During the valve fabrication, hard metal is welded to stainless steel or invar alloy for sealing purposes because of its good heat resistance operating at 500 °C. However, WC (tungsten carbide) dissolution in weld pool softens the hard metal and decreases mechanical properties near the hard metal/weld interface. In order to analyze the WC dissolution in welded joint, joining of hard metal and invar alloy was carried out using laser-tungsten inert gas hybrid welding method. Microstructures of the weld region, chemical composition were investigated using optical microscope, scanning electron microscopy, and EDAX, respectively. Mechanical properties such as microhardness and four-point bend strength test were performed. Larger and smaller WC dissolution and WC dissolution through transition layer based on thermo-dynamics were discussed. The results thus indicate that WC dissolution led to cellular microstructure, columnar crystal, and transition layer under the effect of laser beam and tungsten arc. WC dissolution was affected by metal ions Fe+, Ni+, Co+ exchange in W-M-C system, and WC grain growth was driven by forces caused by laser beam and tungsten arc in larger WC, smaller WC, and liquid Fe, Ni systems.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grants Number: 51105240). PQX thanks the Foundation support from Shanghai Municipal Education Commission and Dr. L. J. Li from Utah State University for the Visiting Research Fellowship Award, which gives him more research time and opportunities. And many thanks will be given to Dr. Bishal Silwal in Utah State University for his help during paper revision.

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  1. College of Materials Engineering, Shanghai University of Engineering Science, Shanghai, 201620, China

    P. Q. Xu, J. W. Ren, P. L. Zhang, H. Y. Gong & S. L. Yang

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Xu, P.Q., Ren, J.W., Zhang, P.L. et al. Analysis of Formation and Interfacial WC Dissolution Behavior of WC-Co/Invar Laser-TIG Welded Joints. J. of Materi Eng and Perform 22, 613–623 (2013). https://doi.org/10.1007/s11665-012-0279-z

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  • DOI: https://doi.org/10.1007/s11665-012-0279-z

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