Preparing Pipes and Fittings for Electrofusion Welding
When it comes to welding HDPE pipe using electrofusion fittings, success starts well before the welding cycle begins. Proper preparation is essential to achieving a strong, safe, and long-lasting joint. Not following a proper process during this phase can result in failed welds, costly repairs, and downtime.
This guide outlines the key preparation steps required to help ensure a reliable weld:
Clean the Pipe and Fitting Surfaces: Start by thoroughly cleaning the pipe ends and the interior surface of the electrofusion fitting using Tefco Iso Wipes. Remove all traces of mud, dust, grease, and any other contaminants.
Cut Pipe Ends Square and Deburr: Precision is important. Pipe ends must be cut square to their axis using a pipe cutter or similar tool with a fixed guide blade. After cutting, remove burrs and fragments from the outer edge to allow easy and correct insertion into the fitting.
Mark the Scraping Area: Mark the area to be scraped using a permanent marker, ensuring it covers the full insertion depth plus at least 10mm. This helps prepare the exact area where the weld will form and prevents under-scraping.
Remove the Oxidised Surface Layer: Over time, HDPE forms an oxidised outer layer that must be removed before welding. Use only purpose-built scrapers, either manual or mechanical. For pipes up to DN 63mm, remove around 0.1mm of the surface. For DN 63mm and above, aim for around 0.2mm. Never scrape the electrofusion fitting itself.
Clean Scraped Surfaces Again: Once scraping is complete, clean the pipe ends again to remove any dust or residue, using Tefco Iso Wipes. Ensure the surface is completely dry before proceeding. Only remove the electrofusion fitting from its packaging immediately before welding to avoid contamination.
Mark the Insertion Depth: Mark the insertion depth on the pipe, typically equal to half the length of the fitting – one at least one third of the circumference. This mark helps confirm full insertion and alignment during the welding process.
Insert Pipes Into the Fitting: Carefully insert the pipes into the fitting without forcing. The pipes and fitting should be aligned precisely using aligners or clamps to maintain proper positioning. If insertion is difficult, inspect the pipe for ovality or size inconsistencies. Ensure the depth marks align correctly.
With the elements correctly cleaned, cut, scraped, and aligned, the welding cycle is ready to start. Following proper preparation not only ensures compliance with standards, but also helps guarantee a durable, high-integrity joint.
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