Heat fusion is what makes HDPE a continuous, leak-free system. Done right, a butt-fused joint is as strong as the pipe itself, following ASTM F2620.
The five steps
- Secure & face. Clamp both pipe ends and face them flat and parallel.
- Align. Check the ends meet squarely with minimal high-low offset.
- Heat & soak. Bring both ends to fusion temperature with the heated plate, then hold so heat penetrates the wall.
- Join. Remove the plate and bring the ends together at the correct interfacial pressure to form a uniform bead.
- Cool. Hold pressure while the joint cools — rushing this is the most common cause of weak joints.
The numbers that matter
Four parameters drive a good joint: heater temperature, interfacial pressure, heat-soak time and cooling time — which depend on pipe size, wall and machine. Tools like the GPP Fusion Log calculate and record them.
Why records matter
Owners and inspectors increasingly ask for proof each joint was made to procedure. A clean per-joint record protects everyone and speeds close-out.
Need the right machine for your range? See the Titan and Forge machines or request a quote.