Butt Fusion welding checklist
- Trim the pipe ends all the way around
- Clean the heater plates
- When clamping the pipes in place, use the clamps to re-round the pipes
- Correct procedure: Ask for evidence of recent, random weld inspections by your supervisors
Pressure
- Measure the drag pressure
- Check the right fusion pressure
- Add the two together for the overall pressure setting
Temperature
- Set the right heater place temperature (usually in the reange of 200-240C
- Give enough heat soak time for the pipe ends to fully heat up
- Keep dwell time down so the pipe ends don’t cool before contact
Alighnment
- Aim for less than 1mm misalignment
- For thicker pipes, misalignment must not exceed 10% of the pipe wall thickness (e.g. for 18mm thick pipe, no more thatn 1.8mm)
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