Electrofusion Welding
Electrofusion welding is a form of resistive implant welding used to join pipes.
THE PROCESS
Electrofusion welding employs fittings that are placed around the joint to be welded. Metal coils are implanted into the fittings, and electric current is run through the coils to generate heat and melt part of the pipes, forming a joint upon solidification. There are two possible fittings used in electrofusion welding: couplers and tapping tees (saddles). Coupler fittings contain two separate regions of coils, creating two distinct fusion zones during welding. The inner diameter of the coupler is typically slightly larger than the outer diameter of the pipes. This is to increase the ease of assembly in the field and allows for minor inconsistencies in pipe diameter. Proper insertion of the pipes in the coupler is critical for the creation of a strong joint. Incorrect placement of the coupler can cause the coils to move and lead to the extrusion of molten polymer material from the joint, reducing the joint’s strength. Tapping tees, or saddles, are less common but operate under the same principles as a coupler. They require clamping to ensure a proper fit up with the pipes.
User-friendly, system-friendly
Electrofusion is a highly efficient welding technology that combines special fittings with built-in electric heating elements to ensure complete homogeneity of the system. The welding machine connects to the fitting, and automatically determines the welding time, before left to cool. This process is highly suitable for joints made on site or in tight areas.
Durable simplicity
This automated welding process makes pipe joining much easier, faster and it minimizes ‘human’ errors. As the weld is made on the outside of the tube, the inside remains smooth, contributing to the flow quality of the entire network, and preventing scale and incrustation that normally causes serious problems at joints.
ADVANTAGES
Advantages of electrofusion welding:
- A simple process capable of producing consistent joints
- The process is entirely contained, reducing the risk of joint contamination
- The process allows repair without the need to remove pipes
Disadvantages of electrofusion welding:
- A special sleeve is required, so it is more expensive than other pipe-joining methods such as hot plate joining
- Implanted coils make the recycling of parts more difficult
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Address: Unit 11 Austerville Factories, Maryhill Road, Jacobs