热熔温度对聚乙烯燃气管道焊接接头性能的影响OA

Heat fusion welding was one of the primary methods for connecting polyethylene(PE)pipes,and the heat fusion process parameters significantly influenced the properties of the welded joints and the overall pipeline performance.In the study,the heat fusion welding temperature was selected as the variable,and different welded specimens were prepared by referring to the qualified welding procedure specification(WPS).The properties of PE welded joints at different heat fusion temperatures were subsequently analyzed.The results indicated that the heat fusion temperature exerted a significant effect on the performance of PE welded joints.The tensile strength,impact toughness,and initial storage modulus all exhibited a trend of initial increase followed by decrease.The welded joint achieved optimal performance at a heat fusion temperature of 225℃.At heat fusion temperatures of 185℃and 245℃,the number of cracks on the tensile fracture surfaces of the heat-affected zones increased,and oxidation and chain scission of PE molecular chains occurred,demonstrating that excessively low or high heat fusion temperatures compromised the mechanical properties of the welded joints.