Production & Quality
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PVDF Pipeline Welding Process Defects
Problem Phenomenon
【Problem phenomenon】Leakage at hot-melt butt or socket welds of PVDF pipelines, with insufficient weld strength
Cause Analysis
PVDF has good weldability, but the windows of welding temperature, heating time, and butt pressure are narrow, and parameter deviation causes cold welds or over-melting; pipe end cleanliness and alignment also affect weld quality
Solution
Set the three elements of temperature, time, and pressure according to the pipe supplier's welding procedure; clean pipe ends before welding and ensure alignment; perform bead inspection and sampling pressure tests on welds, and welders work with certification
Key Takeaway
The three elements of PVDF welding are temperature control, time control, and pressure control; cleanliness and alignment are equally indispensable; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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