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This paper attempted to explain the relation between the surface temperature on the seam under heat welding with various welding conditions such as the material of the sheet, the preset temperature of the self-propelled heat welding machine, welding speed of the machine, and the result of friction test of the welded seam. From the result of the experiments which were conducted on the conditions of 10 C of temperature, correlation was observed in the surface temperature on the welded seam of HDPE which were obtained from the thermal image and the friction test result. It was found that the welded seam became faulty if the surface temperature of the seam was lower than 50 C. Furthermore, the heat transfer model for calculating surface temperature of the welded seam was developed and the model calculations and observations were compared. In the comparisons the model and observations differ only 3.0 percent.

HEAT TRANSFER SIMULATION OF THERMO-GRAPH INSPECTION FOR GEOMEMBRANE SEAM EVALUATION