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Effect of filler metal thickness, brazing time, and brazing temperature on impact shear strength of AISI420/BNi-2 brazed joints at different strain rates

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Abstract

Shear specimens are used to evaluate the quality of brazing joints. In this study, the Instron machine was used for quasi-static compression shear tests at low strain rates, and the experiments for high strain rates were performed by split Hopkinson pressure bar apparatus using a pin-and-collar specimen. Brazed joints of AISI 420 stainless steel were prepared using BNi-2 filler metals. Parameters examined include brazing joint seam (filler metal thickness), brazing time, and brazing temperature. In this study, the joint seams of 20, 60, and 100 µm, filled with BNi-2 sheets, were used. After preparation, the samples were placed in a vacuum brazing oven at 1030, 1080, and 1130 °C for 5, 25, and 45 min based on the experimental design. High-strain-rate compression tests were performed at three strain rates of 1000, 1300, and 1600 s−1. Also, low-strain-rate compression tests were performed at the strain rates of 0.03 s−1. It was found that the shear strength diminishes with enlarging joint seam. It was also observed that increasing the joint seam reduced the shear strength at different strain rates. Increasing the brazing temperature to 1130 °C improved the shear strength. Increasing the brazing time to 45 min increased the shear strength. The values obtained by this experiment for the shear strength at different strain rates were roughly close to the data yielded from desirability optimization. Field-emission scanning electron microscope, equipped with an energy dispersive spectrometer system, was used to perform microstructural tests.

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Correspondence to Mohammad Damghani Nouri.

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Niyaraki, M.N., Nouri, M.D. Effect of filler metal thickness, brazing time, and brazing temperature on impact shear strength of AISI420/BNi-2 brazed joints at different strain rates. J Braz. Soc. Mech. Sci. Eng. 45, 3 (2023). https://doi.org/10.1007/s40430-022-03879-z

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