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Diffusion Enhancement during Electrically Assisted Brazing of Ferritic Stainless Steel Alloys
Viet Tien Luu,Thi Kieu Anh Dinh,Hrishikesh Das,김주리,홍성태,성현민,한흥남 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.5 No.5
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.