Moisture-induced defects produced by direct laser joining of AA7075 aluminum and PEEK
Open accessAbstract
The present investigation aims to determine how polymer moisture and volatile compounds influence the mechanical behavior of hybrid metal-polymer joints made by Laser-Assisted Joining. Experimental laser joining tests were performed on AA7075 aluminum alloy and Polyetheretherketone (PEEK). Some polymer samples were pre-treated through drying to remove the moisture stored in the PEEK before joining. Laser spot joints were produced with dried and as-received samples at different heating times. Different characterization techniques were adopted to determine the influence of moisture on the performance of the joints. Single lap shear tests were performed to assess the mechanical behavior of the joints. Fracture surface analysis was carried out through Optical Microscopy to determine the influence of the moisture content on the mechanical behavior. The results indicated a significant influence of moisture on the mechanical behavior of the joints. This led to the formation and coalescence of voids at the metal-polymer interface that affected the mechanical behavior of the joints. Dried samples were characterized by higher shear force (up to 33 %) and higher toughness (up to 130 %) compared to as-received samples.
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Drying is a crucial pre-treatment step, as the presence of moisture during processing can lead to defects and negatively affect the final properties due to gas formation.
“Drying is a crucial pre-treatment step, as the presence of moisture during processing can lead to defects and negatively affect the final properties due to gas formation [380].”
From A comprehensive review of lunar-based manufacturing and construction (2024) · cites this paper as [380]
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A comprehensive review of lunar-based manufacturing and construction
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- Authors
- Lambiase, F., & Genna, S.
- Affiliations
- University of L'Aquila (IT)
- University of Rome Tor Vergata (IT)
- Corresponding author
- Lambiase, F.
- Venue
- Optics & Laser Technology
- Publisher
- Elsevier BV
- Published
- 2023-10
- Volume
- 165
- Pages
- 109553
- ISSN
- 0030-3992 (ISSN-L)
- OpenAlex
- W4377018486
- Cited by
- 6
- References
- 35
- Citations by year
- 2026: 3 · 2025: 1 · 2024: 1 · 2023: 1
- FWCI
- 0.59
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Optics & Laser Technology (publishedVersion, cc-by)
- Archivio Istituzionale della Ricerca - Università degli Studi dell Aquila (submittedVersion, cc-by)
- Cineca Institutional Research Information System (Tor Vergata University) (submittedVersion)
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › Welding Techniques and Residual Stresses
- Physical Sciences › Engineering › Mechanical Engineering › Advanced Welding Techniques Analysis
- Physical Sciences › Engineering › Mechanical Engineering › Additive Manufacturing Materials and Processes
- Keywords
- 7075 aluminum alloy, PEEK, moisture content, polymer drying, void formation, metal-polymer interface, single lap shear strength, fractography, joint toughness
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