A review of research progress on the minimization of weld lines in injection molding

Xi-jue Li, Ze-mian Zuo, Hao-Yang Mi*, Bin-bin Dong, Maxwell Fordjour Antwi-Afari, Chun-tai Liu, Chang-yu Shen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Injection molding is in high demand in several industries due to its efficiency and versatility. Quality control plays a crucial role in ensuring the excellence of plastic products during injection molding. However, the phenomenon of weld lines has persisted due to the susceptibility of melt flow in the mold cavity for independent or multiple related parameters. This paper presents a comprehensive review of recent advances in minimizing weld lines during injection molding. This review study is categorized into four parts, namely, (1) causes of formation, (2) influencing factors and mechanisms, (3) numerical prediction methods, and (4) improvement methods for weld lines. In the end, based on the findings summarized in this review paper, future research directions for optimal control of weld lines are discussed.

Original languageEnglish
Pages (from-to)5179-5210
Number of pages32
JournalInternational Journal of Advanced Manufacturing Technology
Issue number11-12
Early online date30 Apr 2024
Publication statusPublished - Jun 2024

Bibliographical note

Copyright © Springer Nature B.V. 2024. The final publication is available at Springer via https://doi.org/10.1007/s00170-024-13607-7


  • Improvement measures
  • Injection molding
  • Surface quality
  • Weld lines


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