Diffusion Enhancement during Electrically Assisted Brazing of Ferritic Stainless Steel Alloys
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The electrically assisted brazing of a ferritic stainless steel with nickel-based filler metal is experimentally investigated. During electrically assisted brazing of a lap joint, the temperature of the joint is first rapidly increased to a brazing temperature and held nearly constant for a specific period using a pulsed electric current. Microstructural analysis results strongly suggest that the electric current during electrically assisted brazing enhances diffusion between the filler metal and the ferritic stainless steel, thus inducing significantly thicker diffusion zones compared with induction brazing. The mechanical test results show that the strength of the electrically assisted brazing joint is comparable to or even superior to those of the joint fabricated by induction brazing, while the process time of the electrically assisted brazing is significantly shorter than that of induction brazing.
KeywordsElectrically assisted Brazing Diffusion Stainless steels
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- 2.Kim, K.-H., Bang, H.-S., Ro, C.-S., and Bang, H.-S., “Influence of Preheating Source on Mechanical Properties and Welding Residual Stress Characteristics in Ultra Thin Ferritic Stainless Steel Hybrid Friction Stir Welded Joints,” International Journal of Precision Engineering and Manufacturing-Green Technology, Vol. 4, No. 4, pp. 393–400, 2017.CrossRefGoogle Scholar
- 8.Lugscheider, E. and Partz, K. D., “High Temperature Brazing of Stainless Steel with Nickel-base Filler Metals BNi-2, BNi-5 and BNi-7,” Welding Journal, Vol. 62, No. 6, pp. 160–164, 1983.Google Scholar
- 12.Kim. M.-S., Vinh, N. T., Yu, H.-H., Hong, S.-T., Lee, H.-W., et al., “Effect of Electric Current Density on the Mechanical Property of Advanced High Strength Steels under Quasi-Static Tensile Loads,” International Journal of Precision Engineering and Manufacturing, Vol. 15, No. 6, pp. 1207–1213, 2014.CrossRefGoogle Scholar
- 20.Davies, J. and Simpson, P., “Induction Heating Handbook,” McGraw-Hill, 1979.Google Scholar
- 22.Atabaki, M. M., Wati, J. N., and Idris, J. “Transient Liquid Phase Diffusion Brazing of Stainless Steel 304,” Welding Journal, Vol. 92, pp. 57, 2013.Google Scholar