<title>Measuring the thermography of friction-welding process</title>

ABSTRACT The full process for measuring the thermography of friction welding by AGEMA 900 is described. The typicalthermography pictures and temperature data cures are given. It provides scientific basis for parameter design of the friction-welding process. 1. INTRODUCTION The great majority of industrial produces that are now part of our daily life are the result of processes that rely on precise thermal cycles. Thus, the plastics industry, metallurgy, the glass industry and the process industry devote very considerable effort to establishing the optimum temperature for the particular processes. Infrared thermography is a real-time temperature mapping method that allows use to monitor surface thermal phenomena as functions of time. It is the ideal tool for observation, testing and control of industrial processes because of itsability to perform spatial and temporal thermal analysis. The information obtained in this way is used to control the process soas to maintain maximum efficiency.The quality a product is often very dependent on the precision of thermal-parameter control in the manufacturingprocess. In this paper, the full process for measuring the thermography of friction welding by AGEMA 900 is described. Theprocess of friction welding is divided into friction heat, hold temperature, forcing forging and cooling four courses. First, thewelding workpiece is pressed and spin at high speed, the contact two faces are rubbing and heating. While the temperature getsmelting, the process is coming into the hold temperature course. After a few seconds, the workpiece is stopped spin suddenlyand pressed forging at the same time. Then the workpiece is cooling naturally to the room temperature and the full process offriction welding is end. The structure of friction welding belongs to forging. This method can weld two same metals, twodifferent metals or alloys. The full process needs only a few seconds. It is applied in the production of petroleum drill,automobile gearing and knife-tool etc. It may save costly material to maintain the maximum efficiency.