Weld‐lines and its strength evaluation in injection molded parts: A review

Injection molding manufacturing is immensely popular nowadays because of its excellent manufacturability for complex designs produced from a wide range of different engineering plastic materials. Weld-line is a defect that arises in injection molding when two or more flow fronts collide. The weld-li...

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Veröffentlicht in:Polymer engineering and science 2023-11, Vol.63 (11), p.3523-3536
Hauptverfasser: Jadhav, Ganesh, Gaval, Vivek, Solanke, Sachin, Divekar, Mahesh, Darade, Nandkishor, Satpute, Ajay, Goutham, G.P
Format: Artikel
Sprache:eng
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Zusammenfassung:Injection molding manufacturing is immensely popular nowadays because of its excellent manufacturability for complex designs produced from a wide range of different engineering plastic materials. Weld-line is a defect that arises in injection molding when two or more flow fronts collide. The weld-lines are undesirable from both aesthetic and functional points of view and their effect is different for varied materials, process conditions, loadings, forms of weld-line, etc. The presence of a weld-line weakens components locally due to insufficient intermolecular diffusion, v-notch formation, fiber anisotropy, insufficient process conditions, and so on. When a component is under load, crack propagation usually begins with a weak weld-line area. Therefore, the designer should anticipate the presence of weld-lines and their strength to avoid failure of components during operation. In this article, the review of published research work on weld-line formation during injection molding has been summarized. The review focuses on the phenomenon of weld-line formation, the type of weld-lines, and the importance of weld-line evaluations. The theoretical, experimental, and computational approaches to analyzing weld-line and its strength are covered in detail. At last, methods for reducing weld-lines and increasing the strength of weld-line area have been discussed. This review also gathers data on weld-line strength with respect to different materials.
ISSN:0032-3888
1548-2634
DOI:10.1002/pen.26470