Brazing of Inconel X-750 to stainless steel 304 using induction process

The proposed paper discusses results of the joining of Inconel X-750 to stainless steel 304 by induction brazing. The experimental brazing was carried out at 1423 K using a nickel-based brazing BNi-2 (Ni–7Cr–3Fe–3.2B–4.5Si–0.06C wt.%) filler metal. By means of induction heating, joining process can be completed within seconds in argon ambient. The effects of joining time on the microstructures of joint and base materials, elemental distribution within the brazed joint, and the joint shear strengths were investigated. Experimental results show that BNi-2 containing boron and silicon melting point depressants can achieve good wetting and spreading between Inconel X-750 and stainless steel 304. Joint shear strengths of as high as 483 MPa were obtained when processed at approximately 1423 K for 180 s. The width of the braze-affected zone increases with increasing joining time but it does not cause any significant reduction in the joint strength. Inconel X-750 and stainless steel 304 exhibited no noticeable change in their microstructures due to the rapid heating cycle of induction processing.