Electrofusion fittings segmented welding techniques
Apr 06, 2026
The Art of Segmented Welding
Segmented welding of electrofusion fittings is like assembling building blocks; proper segmentation ensures a stronger weld. It is recommended to divide the fitting into 2-3 equal-length segments, each 30-50 cm long. Weld the middle segment first to fix the main structure, then extend the welding towards both ends. When segmenting, avoid the fitting's socket and maintain a 5 cm overlap between adjacent segments as a fusion buffer.
The Secret of Temperature Control
Each segment requires independent temperature control:
Preheating Stage: Use a hot air gun to evenly heat the area to be welded to approximately 130°C.
Welding Stage: Set the electrofusion machine to 180-200°C and maintain stable pressure.
Cooling Stage: Allow the fitting to cool naturally to below 60°C before moving it.
Remember: Allow at least 15 minutes between welding adjacent segments to avoid overlapping heat-affected zones.
Ensuring Welding Quality
Three checks must be performed after each weld section is completed:
Visual Inspection: The weld bead should be a uniform ring shape, free of bubbles or cracks.
Dimensional Measurement: Use calipers to confirm that the thickness of the weld zone reaches 1.2 times the pipe wall thickness.
Pressure Test: Perform a segmented water injection pressure test at 0.8 MPa, holding the pressure for 3 minutes without leakage.
