In this paper, friction field distribution between sliver and pressure bar on a homebred drawing frame is analyzed, and on this basis, the best range of contact arc is deduced.

During the treatment of a particle field the effect of particle diameter, specific weight, rigidity of material and friction factor, etc on particle movement has been taken into account.

The inertia friction welding process is a non-linear process because of the interaction between temperature field and material properties as well as friction force and thrust force.