Hot plate welding of plastics: Factors affecting weld strength
- 1 April 1980
- journal article
- research article
- Published by Wiley in Polymer Engineering & Science
- Vol. 20 (6), 432-440
- https://doi.org/10.1002/pen.760200609
Abstract
Welded joints were made under a range of conditions in polypropylene, glass fiber reinforced polypropylene and poly (methylmethacrylate) bars. Melt flow in the weld was investigated by microscopy and by contact microradiography, and weld strengths were measured by tensile tests. The fracture toughness of the weld zone was determined by tests on double edge notched specimens. The study shows that weld strength is strongly affected by hot plate temperature, heating time and melt flow during welding. Insufficient heating or melt flow results in incomplete bonding. Excessive melt flow produces strong transverse orientation. Both reduce strength, but in different ways, which can be distinguished by fracture mechanics tests.Keywords
This publication has 4 references indexed in Scilit:
- A study of the effect of injection speed on fibre orientation in simple mouldings of short glass fibre-filled polypropyleneJournal of Materials Science, 1978
- The use of tensile tests to determine the optimum conditions for butt welding polyethylene pipes of different melt flow indexJournal of Materials Science, 1977
- The use of tensile tests to determine the optimum conditions for butt fusion welding certain grades of polyethylene, polybutene-1 and polypropylene pipesJournal of Materials Science, 1974
- Some microstructural features of the welds in butt-welded polyethylene and polybutene-1 pipesJournal of Materials Science, 1972