Molding Process
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Cutting and Welding Problems of PE Pipe
Problem Phenomenon
The cut surface of PE pipe is slanted with large burrs, or the butt-fusion weld strength is insufficient.
Cause Analysis
Cutting problems are mostly due to dull saw blades, cutting not synchronized with hauling, and the pipe not being fully cooled; low weld strength is due to improper welding temperature/pressure/time, uneven pipe end faces, and the oxide layer not being milled off.
Solution
①Replace/sharpen the saw blade, correct cutting synchronization, and cut only after full cooling; ②Standardize the three welding elements (temperature/pressure/time); ③Mill the pipe ends flat and clean the end faces; ④Verify the weld rollback quality; ⑤Train welding operations.
Key Takeaway
Cutting and welding of PE pipe is 'the back-end process determines success or failure': saw blade and synchronization govern cutting, end-face treatment and parameters govern welding; weld strength = end-face treatment + parameter standardization.
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