Optimization of Shear Strength of 420 Stainless Steel Brazing Joints Using BNi-2 by Response Surface Methodology

Authors

1 Department of Mechanical Engineering, Faculty of Aerospace Engineering, Shahid Sattari Aeronautical University, Tehran, Iran

2 Assisstant Professor, Department of Mechanical Engineering, Andimeshk Branch, Islamic Azad University, Andimeshk, Iran.

Abstract

In this research, the parameters of brazing temperature, time, and joint seam have been optimized in brazing joints of 420 stainless steel with BNi-2 filler metal on the shear strength of lap joint samples using response surface methodology. The parameters of brazing temperature, time, and joint seam were determined by the design of the experiment using the Benken box method. The thickness of BNi-2 filler metal was considered to be 0.04, 0.07, and 0.1 mm in this research. After preparing the samples, they were placed in a vacuum furnace at temperatures of 1000°C, 1070°C, and 1140°C for 10, 30, and 50 minutes. The mechanical tensile test was performed to determine the shear strength. It was observed that increasing the joint seam from 0.04 to 0.1 mm caused a 14% decrease in shear strength. Also, increasing the brazing temperature from 1000°C to 1140°C has increased the shear strength by 21%, and increasing the brazing time from 10 to 50 minutes has increased the shear strength by 27%. In the end, it was optimized that the maximum shear strength is 164.429 MPa in the joint seam of 0.04 mm, the temperature is 1109.84 °C and the time is 46.58 minutes.

Keywords

Main Subjects


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