Title: Study on the Initial Torque Characteristics of Friction Welding.
Abstract: The torque variation during friction welding is related closely to the friction welding mechanism and the mechanical characteristics of the weld. Especially, the influence of initial torque on the accuracy of welded specimen is remarkably high. In this report, the effects of the initial torque characteristics on the friction welding of carbon steel are examined both theoretically and experimentally. The surface roughness of turned surfaces is modeled as triangular columns that are constructed in concentric configuration. Based on the relationship between the temperature change measurements during friction welding and the high temperature tensile strength of carbon steels, the contact width changes of the interrace and the torque changes are estimated. The experimental and theoretical results show good agreement.