Development of High-Temperature Nicrobrazed Joints Using Induction Heating in an Argon Gas Environment

Abstract

For the fabrication of instrumented capsules for fast reactor applications, there is need to produce brazed joints for service at high temperatures. Fabrication of instrumented capsules requires development of thin-walled joints capable of withstanding high temperatures (>673 K). Out of the various joining methods available for thin-walled joints, development of high-temperature brazed joint method is found to be advantageous. An induction heating technique has been used for this development. Protective atmosphere is required for high-temperature brazing to prevent oxidation of the base metal and the filler metal during the brazing operation (~1303 K). Commercial argon gas (99.996 % pure) has been used and brazed joints have been developed. Trials were carried out during the development of high-temperature brazed joints using induction heating system in an argon gas environment, and the results obtained are discussed in this paper.