Journal
MATERIALS
Volume 15, Issue 14, Pages -Publisher
MDPI
DOI: 10.3390/ma15145081
Keywords
laser welding; dissimilar joining; metal-polymer joining; PMMA; laser conduction joining; surface mechanical pre-treatment
Categories
Funding
- Fundacao para a Ciencia e a Tecnologia (FCT) [UIDB/00481/2020, UIDP/00481/2020]
- Centro Portugal Regional Operational Programme (Centro2020) under the PORTUGAL 2020 Partnership Agreement through the European Regional Development Fund [CENTRO-010145-FEDER-022083]
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This study focuses on the dissimilar joining between polymethylmethacrylate (PMMA) and S235 galvanised steel using a pulsed Nd:YAG laser. The influence of processing parameters and surface conditions on joint strength and quality are investigated. The study reveals the optimum process parameters and the possibility of enhancing joint strength through mechanical pre-treatment.
The search for lightweight structures increases the demand for non-metallic materials, such as polymers, composites, and hybrid structures. This work presents the dissimilar joining through direct laser joining between polymethylmethacrylate (PMMA) and S235 galvanised steel using a pulsed Nd:YAG laser. The main goal is to determine the influence of processing parameters on joint strength and quality. In addition, the impact of surface conditions on the joint quality was also analysed. Overall, the optimum ranges of process parameters were found, and some are worth highlighting, such as the laser beam diameter and pulse duration, which significantly influenced the joint strength. Failure of the welded samples occurred in PMMA component, demonstrating good joint efficiency. Additionally, a maximum increase of 5.1% of the tensile shear strength was achieved thanks to the mechanical pre-treatment. It is possible to conclude that the joining between PMMA and the S235 galvanised steel can be performed by optimising the process parameters. Additionally, it can be enhanced through surface pre-treatments by exploring the mechanical interlock between both materials.
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