Abstract
Solid state welding of Ti/cermet and Ti/TiC was conducted under phase transformation of Ti in air. They were joined well under the load of 0.6MPa and the number of thermal cycle more than 5 (the welding time was 5min), but not joined at the constant temperature of 1233K for 30min. There existed two layers at the welding interface of Ti/cermet, but no layer at the welding interface of Ti/TiC. The strength of welds of Ti/cermet increased up to 102MPa with increasing number of thermal cycle, while the strength of welds of Ti/TiC had no relation with the number of thermal cycle, and the maximum strength was 24.5MPa. The reflectivity of ultrasonic wave at the welding interface increased with the strength of welds.
