Brazing of Hastelloy X with wide clearance butt joints

Wide clearance butt joints of Hastelloy X base metal were vacuum furnace brazed by first sintering a nickel base powder of high melting point (sinter filler metal) in the joint. This was followed by filling the powder interstices with a nickel base brazing filler metal and a diffusion treatment. Various combinations of sinter filler metals and brazing filler metals were studied by the production and examination of small wafers, which were sintered and brazed. These studies proved to be an efficient means of obtaining valuable information regarding the subsequent fabrication of brazed joints. A technique for brazing butt joints of consistent high quality, with virtually unlimited joint clearance, was developed.