The stress crack resistance (SCR) of high-density polyethylene (HDPE) geomembrane extrusion welds is examined for a 1.5 mm HDPE geomembrane and three different welding parameter combinations (denoted as “Cool”, “Good”, and “Overheated”). Results are reported for unnotched welds, unnotched sheet, and notched sheet. The average SCR for a Good extrusion weld is 23% of that of the unnotched sheet SCR. Little variation is found between the three welding parameter combinations for low geometry irregularity SCR weld specimens. There is no statistically significant difference between a good-quality fusion and extrusion weld. However, operator-dependent weld induced geometric irregularity (WIGI) greatly affects the SCR of extrusion welds. Extrusion welds with high WIGI have an average unnotched SCR of only 9% of the unnotched sheet. Extrusion welds with an overground surface can have an unnotched SCR as little as 1% of the best extrusion weld. Deleterious weld bead geometries are identified to provide a framework with which engineers can identify “high-risk” extrusion welds with respect to stress cracking.

针对 1.5 mm HDPE 土工膜和三种不同的焊接参数组合（表示为“冷却”、“良好”和“过热”），检查了高密度聚乙烯 (HDPE) 土工膜挤出焊缝的抗应力开裂性 (SCR)。报告无缺口焊缝、无缺口板材和缺口板材的结果。良好挤压焊缝的平均 SCR 是无缺口板材 SCR 的 23%。对于低几何不规则性 SCR 焊接试样，三种焊接参数组合之间几乎没有发现变化。优质熔接焊缝和挤压焊缝之间没有统计学上的显着差异。然而，操作员相关的焊接引起的几何不规则性 (WIGI) 极大地影响了挤压焊接的 SCR。具有高 WIGI 的挤压焊缝的平均无缺口 SCR 仅为无缺口板材的 9%。具有地上表面的挤压焊缝的无缺口 SCR 仅为最佳挤压焊缝的 1%。有害焊道几何形状的识别提供了一个框架，工程师可以利用该框架来识别与应力开裂有关的“高风险”挤压焊缝。