Electrofusion welding
Quality assurance measures during electrofusion welding
Measures
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Details
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Assignment of skilled technical staff
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Requiring personnel with welding certificates
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Protecting welding area from climatic influence (solar radiation, effects of humidity, wind and temperatures below +5 °C)
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Preheating, covering under canopies, heating
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Inspection of incoming goods
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Visual controlling of the components to be welded (notches, scratches, etc.)
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Cleaning of semi-finished products
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The bonding surfaces of the pipes must be free from contamination. Mechanically removing of soiling, separating layers, oxidation layers with a scraper or a rotary scraper immediately before welding. The inner edge must be deburred and the outer edge rounded off.
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Cleaning of electrofusion fitting (heated coil connector)
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The fitting should be thoroughly cleaned inside with a cleaning agent and absorbent non-fibrous paper.
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Inserting pipe ends into the electrofusion fitting
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When locating the electrofusion fitting attention must be paid that fitting and pipe are not tilted or forcibly inserted otherwise the heated coil could be moved or damaged.
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Welding parameters
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Correct calculation and maintenance of welding periods, welding temperatures and welding pressures
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Welding
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Only welding equipment suited to the electrofusion fitting should be used. Before welding the welding equipment is adjusted to the welding parameters corresponding to the diameter and nominal pressure of the pipe.
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Non-destructive testing of welding seam
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Visual inspection, ultrasonic testing, x-ray testing
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Monitoring of welding work
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Welding protocols or documentations
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