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The Effect of Brazing Temperature on Shear Strength of Nickel Based Superalloy (Inconel 738LC) Joints

In this study, nickel based superalloy In738 LC was brazed by using (Ni–Ti) and (Ni–Ti–Al) alloys which are an active filler alloys under protective atmosphere (using a high purity 99.999 Argon gas). Five brazing temperatures (1135, 1025, 985, 825, 725 ◦C) were chosen based on the solidus temperature of (Ni–Ti) and (Ni–Al) filler alloys in order to investigate the effects of these temperatures on the performance of the brazed joints. Brazing processes were carried out over 15 min period of time to ensure that the filler alloys were melted completely. The performance of brazing process was evaluated in terms of bonding strength by shear test. The results revealed that a maximum value of shear strength (29 MPa) as compared with other temperatures was obtained at brazing temperature 985 ◦C. It was observed that the highest shear strength was influenced by the formation of Ni3Ti phase.