Effect of the Heat Input on the Tensile Properties in Arc Brazing of Ferritic Stainless Steel using Cu-Si Insert Alloy

The effects of heat input and different microstructures were investigated on the tensile-shear properties of an arc-brazed joint of the ferritic stainless steel 429EM using a Cu-Si insert alloy. The brazing speed was fixed at 800 mm/min while the brazing current varied from 80 to 120A. For abrazing current lower than 100A, fracturing occurred at the joint root in the direction perpendicular to the tensile load. As the brazing current increased to 120A, fracturing occurred at the base metal or the joint root. The joint and the base metal had very similar yield and tensile load values. However, the amount of elongation was decreased considerably compared towhen the base metal was used. The fracturing began at the triple point of the root part and was classified into three types. The difference in the tensile-shear properties was closely related to the three fracture types.