Brazing of Inconel 600 by active filler metal

Inconel 600 alloy was brazed at three different brazing temperatures 830, 865 and 900 degrees C for 30 minutes. An active filler metal, Ag-Cu-Ti, was utilised to study its effects on bonding strength by the diffusion of some elements with Inconel 600 during brazing. The experiment was carried out in a high vacuum chamber at 1 x 10(-4) Pa. Scanning electron microscope-energy dispersive spectroscopy and electron probe microanalysis was conducted for element identification and a shear test served to evaluate the bonding strength. The results show that good bonding was achieved and two continuous reaction layers were formed in the brazed area. The reaction layers were crossing in the middle in most areas at 865 degrees C compared to 830 and 900 degrees C. It was revealed that a stronger Ti-Ni interaction than Ti-Cu influenced the formation behaviour of reaction layers and the highest shear strength identified was at 865 degrees C.