Research on ultrasonic testing technology for polyethylene pipe hot-melting welded joints

Due to the advantages of corrosion resistance, no scaling, light weight, polyethylene pipes are widely used in low pressure gas networks and their safety has also been duly noted. As for heat fusion welding of PE pipeline connectors, there is no effective means of detection internally. In this paper, welding specimens were tested under the condition of normal conditions, low melting temperature, low pressure, low heating time melts, underwater welding by the United States imported equipment based on the echo pulse method of ultrasonic testing technology. Comparing with the results of related conditions of tensile tests, this paper found that ultrasound can effectively identify internal defects of hot-melt connectors. And there is a corresponding relationship between the ultrasonic system evaluation grades and the elongation at break, the higher the level, the lower the elongation at break. Related research results can provide the basis for the establishment of PE pipe ultrasonic non-destructive testing inspection standards.