Subscribe to our newsletter to receive the latest news and events from TWI:

Subscribe >
Skip to content

Novel method joins plastic pipes

Back to Pre-1998 Articles Adhesive technology demonstration centre Aged samples lend added credence to safety codes Arc welding Demonstration Centre shows best practice in action Boiler takes the heat in comfort Conductive adhesive for ultrasound catheter cracking-risk-in-steel-pipelines-from-external-hard-zones Engineering critical assessment of pipeline welds Far East fitness-for-purpose check First UK Research Council contract for TWI Friction stir welding of titanium Help with adhesives training Joining demonstration centres in industry Joining Forces success in Belfast Joints take 10 seconds in the microwave LIVEMAN - Advanced joining processes for lightweight vehicle manufacture Making calculations easier 'Mildly sour' environment project saves half a million pounds New standard for weld fracture toughness testing Novel method joins plastic pipes Plastics fume - new findings released Project saves time and money for Amerada Hess Small firms seize no-cost reviews and low-cost trials South East Asia ACFM course Space Shuttle technology transferred to power generation industry Spot the evidence Structural integrity assured for Liverpool Bay Supporting technology on the Indian sub-continent Technology demonstrators show best practice in action Thermomechanical material processing by friction [friction pillar processing] 'Tubestress' measures residual stresses in parts that other equipment cannot reach TWI enhances on-stream inspection service Underwater welding work expands at TWI North Wider recognition for welding inspectors
 

Novel method for joining plastic pipes

Connect, no.77, June 1996

con9661.gif

Linear vibration welding as a method for joining plastic pipes has been investigated at TWI. This process will reduce welding and cooling time and the overall costs of installing polyethylene (PE) pipes.

Results from tests show that linear vibration welding is potentially more cost effective than methods currently used in industry - hot plate welding and electrofusion welding. Cycle times are shorter (up to 1/50 of other methods)and energy consumption is less than with traditional techniques. This method has been in use as a plastics joining technique in the automotive and domestic appliance industries since the mid 1970s, but further development is needed to fully commercialise it for on-site and factory joining of plastics pipes.

Initial welding trials were carried out at TWI on two types of PE pipe -125mm SDR 11 PE80 and 180mm SDR 17.6 PE100. Results showed that welds can be produced with an overall weld/cool time of less than 30 seconds. When tensile tested, such welds failed in a ductile manner with welding factors greater than 0.9.

This initial work examined the linear vibration welding of PE pipes, but the technique is also suitable for joining any extruded or moulded component made from almost any thermoplastic material.

For more information please email:


contactus@twi.co.uk