Common Questions about Electrofusion Welding
In PE pipeline construction, electrofusion welding is a critical process. Below are some frequently asked questions and answers for your reference.
Q: What should be noted when scraping electrofusion fittings?
A: Before welding, electrofusion fittings must be scraped to remove the oxidized surface layer and expose a fresh, active surface. This ensures strong and reliable fusion.
Scraping must be even and continuous, not done superficially.
Incomplete scraping may leave oxidation layers, reducing joint strength and even causing leakage.
Therefore, scraping should always be uniform, thorough, and precise to keep the fusion surface clean and fresh.
Q: Does voltage and current fluctuation affect electrofusion welding?
A: Yes, voltage and current stability are crucial in electrofusion welding.
Large fluctuations may lead to insufficient heating, preventing proper fusion of the joint.
Overheating, on the other hand, can burn the melt layer and weaken the weld.
For this reason, professional projects must be equipped with voltage stabilizers to ensure a stable and reliable welding process.
Q: What are the differences between welding PE gas pipes and water supply/drainage pipes?
A: From a technical perspective, both gas pipes and water supply/drainage pipes use butt fusion or electrofusion methods, with no essential difference. However, due to different application areas and safety requirements, there are key differences:
· Gas pipes: Strict requirements apply to material storage time and pressure testing methods.
· Quality control: Welding standards for gas pipes are more rigorous, with tighter inspection procedures.
· Connection method: For small-diameter gas pipes (e.g., below dn90, SDR17 or wall thickness ≤6mm), electrofusion is mandatory, while for water supply/drainage pipes this is not required.
In short, welding requirements for gas pipelines are stricter than for water supply pipelines, and construction must strictly follow the relevant standards.
