Technical Guides

Why do two butt fusion machines require different gauge pressures for the same HDPE pipe? This article explains how effective piston area and drag pressure affect the setting, what to check before comparing readings, and why pressure values should not be copied from one machine to another.

Can HDPE pipes with different SDRs be butt fused? In some cases, yes—but the same outside diameter is not enough. This article explains how wall thickness affects the joint and what to confirm before welding, including material compatibility, project requirements, and a written fusion procedure.

This article explains why clamp insert design changes as butt fusion machine size increases, including differences in contact area, clamping stability, one-piece structures, widened inserts, and aluminum clamp design for large HDPE pipe welding.

This article explains the basic pressure and time parameters used in HDPE butt fusion welding, including P1, P2 and P3, and shows how jointing pressure is calculated using pipe dimensions, interfacial pressure, piston area and drag pressure. Calculation examples based on ISO 21307:2017 and DVS 2207-1 are also included, together with a link to an online butt fusion pressure calculator.

Learn how to inspect PE pipe butt fusion joints through fusion bead profiles, identify welding defects, and understand factors affecting joint quality.