A Study on Formation of Alloyed Layer of Low Melting Temperature on Bonding Surface of IN738LC with CO₂ Laser

Study on Diffusion Welding Alloyed Layer on Bonding Surface (Report 1)

Abstract

Diffusion welding method using alloyed layer of low melting temperature on bonding surface of IN 738LC with CO₂ laser has been studied.
In this report, effect of laser beam irradiating condition on formation of alloyed layer, measurement of melting temperature and boride precipitates of the alloyed layer were investigated.
The results indicated that homogeneous alloyed layer was obtained by irradiating linearly focused laser beam (Output: 1.8 kW, Scanning Speed: 0.3 m/min) on bonding surface coated with BNi-2 powder (grain size: 74-105μm). The alloyed layer was about 300μm in thickness, melting temperature of the alloyed layer was about 1170°C.