Welding techniques have been used for more than 4 decades, taking benefit of the attributes of thermoplastic PE, both for water and gas pipes. Two types of welding methods are mainly used: An electrofusion welder and a butt welder. Both methods are quite simple to perform in the country, but it is important that the surfaces should be prepared properly to be welded and that the welding parameters are strictly utilized. Both electro fusion fittings and butt welding machines are generally more automatic, though the skills of the workers and training are still quite vital. It is being introduced as the automatic welding machines that alleviate the welding procedure with all the vital parameters, with the aim of having the traceability of them. It is suggested not to join with butt welding pipes of various materials and with different wall density. In this situation, it is recommendable to weld the pipes with an electrofusion welder. The butt welding process can only be done to join pipes with the same wall density. According to me, we should choose the best system of joining according to the type of work we have to do as both systems have displayed their dependability every time they have been used under the defined conditions. Giving an oval shape to the PE pipes is more problematic for the electrofusion welding than for the butt welding, and that’s why huge manufacturers of electro fusion fittings put pressure on the standardization committees to lessen the resistance of ovality in PE pipes. Most of the issues I have faced during the introduction of the elctrofusion fittings for water pipes have been created by not scraping the pipes, as PE pipes are in contact with the oxygen of the air so they suffer a bit superficial rusting that should be eliminated by scraping.
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January 2018
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