Aspects on the study of nonlinear vibration phenomenon in friction welding with rotating active element

The friction welding with rotating active element is a complex process including heating of the materials using friction and plastic deformation generated by a tool that has both rotation and translation motions. The paper is analysing the nonlinear vibrations that occurs during the friction welding with rotating active element process, mainly due to the motion of the rotating element. Using the dynamic systems theory, the nonlinear equation of the motion is deduced and the motion characteristics are presented using specific qualitative methods. The results are contributing to a more accurate understanding of the phenomena, in this case the nonlinear vibrations, generated in the friction welding with rotating active element process, and to better performances of welding process.