Numerical modelling of the linear friction welding process

Linear friction welding (LFW) is a solid-state joining process applied to non-axisymmetric components. LFW involves joining of materials through the relative reciprocating motion of two components under an axial force. In such process the heat source is given by the frictional forces work decaying into heat determining a local softening of the material and proper bonding conditions due to both the temperature increase and the local pressure of the two edges to be welded. In the present work the authors present a numerical model of the linear friction welding process of AISI 1045 parts. The numerical model allowed to highlight the process mechanics and the physical conditions which must be reached in order to obtain a correct and effective bonding between the specimens. In this way, the distribution and the history evolution of the most relevant field variables, namely temperature, strain, strain rate and pressure reached at the interface between the two specimens, were investigated.