The welding quality test and performance assessment for pipes become more and more important with the application of engineering plastics pipe.
随着工程塑料管道应用的不断深入，管道的焊接质量检测及其性能评定成了一个重要的问题。
The weathering quality of plastics pipe is a valued question, which is relative with welding quality and mechanical fracture.
塑料管的耐老化性能及焊接质量与力学破坏有关，是需要重视的问题。
The weathering quality of plastics pipe is a valued question, which is relative with welding quality and mechanical fracture.
塑料管的耐老化性能及焊接质量与力学破坏有关，是需要重视的问题。
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