The weld-interface friction behavior is assumed to follow that described by Moal and Massoni (1995), where the ratio of shear stress to the prescribed pressure is observed to be a complex function of interface slip rate. The principal interaction occurs at the weld interface between the pipes however, a secondary concern is the possibility of contact of weld flash with the side of the pipes. Understanding the friction, material properties, and heat transfer environment are important design aspects in an effective inertia welding process therefore, simulation is a helpful tool in the process design. An important factor in the process design is control of the initial speed of the flywheel so that, when the flywheel stops, the temperature rises to just below the melting point, which in turn results in significant flow of material in the region of the weld joint.
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