Content
Fundamentals concerning plastics
Polyethylene
Welding of polyethylene
Welding temperature
Welding force
Welding times
Factors of influence on the welding quality
Welding methods for HD-PE components
Heating element butt welding
Preparatory work
Description of method
Alignment process
Heating-up
Relocating
Joining
Welding parameters polyethylene
Staff and equipment
Equipment
Preparatory work for welding
Preparatory work for welding
Controlling the welding seam
Ultrasonic testing of HD-PE-welding seams
Evaluation of fracture surface
Documentation
Sources of failure
Finishing work
Quality assurance for the heating element butt wel...
Standards and regulations for heating element butt...
Electrofusion welding
Extrusion welding
Standards and regulations for tests
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The areas to be welded are supposed to connect with a velocity of near zero. The necessary jointing pressure is preferably applied in linear increase and is, for instance, 0.15 ± 0.01 N/mm2 for PE. Sudden use of full pressure would press the hot plastic material out of the welding zone which would result in an inadequate weld factor [Simona11]. The jointing pressure has to be maintained during the cooling-off period. |
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