Abstract
Abstract In the electrofusion (EF) welding process of polyethylene (PE) pipes, the welding temperature field and its variations are available for predicting EF joint properties. The welding temperature field has key factors, which determine the welding quality to influence EF joint properties. However, it is difficult to measure and evaluate the welding temperature field in real time. We proposed a novel real-time evaluation method for the temperature field in the EF welding process of PE pipes. The temperature field in the EF welding process was simulated, based on a one-dimensional unsteady state heat transfer model. In the simulation, the temperature of the fusion zone dropped at the same rate. The EF joints of the whole welding process were detected by the ultrasonic phased array inspection, and phased array images were recorded in real time by using the video recording function of ultrasonic inspection instruments. According to the rate of temperature dropping in the fusion zone, the measurement model of the welding temperature field was established with video recordings. Then, welding temperature fields were evaluated in real time by using the temperature field of the normal welding process. Furthermore, the evaluation method was to set the foundation for exploring the formative mechanism of EF joint strength and optimizing welding parameters.
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