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首页> 美国政府科技报告 >Defect Discrimination in Heat-Fused Polyethylene Pipe Joints. Phase 3. Development and Evaluation of a Portable System. Final Report April 1985-July 1987
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Defect Discrimination in Heat-Fused Polyethylene Pipe Joints. Phase 3. Development and Evaluation of a Portable System. Final Report April 1985-July 1987

机译：热熔聚乙烯管接头缺陷判别。阶段3.便携式系统的开发和评估。 1985年4月至1987年7月的最终报告

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摘要

A prototype ultrasonic inspection system that discriminates automatically between acceptable and substandard heat-fused butt welds in 4-inch diameter polyethylene pipes was developed. The system can differentiate weld quality to better than a 92 pe rcent accuracy for situations that would be extremely difficult for an inspector to identify from visual observation of the ultrasonic waveforms. The prototype system is portable, is moderately rugged, and can be used with minimal training. The use of the system was demonstrated at several utilities and subjected to blind tests at five utilities. Although the statistics of the discrimination capability of the flaw detector are limited, all of the in-field defect types and nearly all of the pedagogical defects introduced by the utilities were correctly identified. The system in its present form can be used for classroom training of new butt-fusion operators and recertification of experienced butt-fusion crews.

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