ABSTRACT
Linear friction welding (LFW) is a relatively new solid-state welding process where frictional heat is produced on the interface by a relative linear reciprocating movement between two components under a suitable combination of pressure, amplitude, and frequency of oscillation. During LFW, the faying surfaces are kept tightly in contact; hence, no shielding gas or filler wire is required. LFW is an effective welding technique for joining titanium alloys due to their good high-temperature properties like compressive yield and shear strength, and low thermal conductivities. Residual stresses in LFW joints are caused by the thermal mismatch which is created by different cooling rates at various positions across the weld and the obvious microstructure change. Significant residual stresses have been reported in LFW joints due to the thermal mismatch caused by various cooling rates at different positions across the weld.
