Laser Surface Pre-treatment of Aluminium for Hybrid Joints with Glass Fibre Reinforced Thermoplastics

Heckert, André; Zaeh, Michael F.

doi:10.1016/j.phpro.2014.08.032

Cited by 94 publications

(44 citation statements)

References 9 publications

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“…The tensile shear strength according to DIN EN 1465 has to be determined to evaluate the strength of the joint [1]. This approach is suitable considering the comparability of adhesive connections with direct thermal bonding and the fact that this test has been successfully used in several investigations [3,11,17]. The geometric dimensions of the specimens were determined based on this standard to a length of 100 ± 0.25 mm and a width of 25 ± 0.25 mm , with an overlap of the joining partners of 12.5 ± 0.25 mm [1].…”

Section: Requirements For the Test Rigmentioning

confidence: 99%

“…The advantages are short cycle times, the elimination of additional material and less fibre damage compared to conventional processes such as screwing, riveting or adhesive bonding. Recent tests on adhesive joints have also shown that laser-assisted pretreatment of the metal surface can significantly increase the strength of the joint [2,3]. For this paper, the heat supply for thermal joining was realized by electromagnetic induction to enable a contactless and flexible joining process.…”

Section: Introductionmentioning

confidence: 99%

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Induction-based joining of titanium with thermoplastics

Lugauer¹,

Kandler²,

Meyer³

et al. 2019

Prod. Eng. Res. Devel.

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The importance of hybrid composites is increasing, particularly with regard to structural lightweight construction. Therefore, a joining process for the production of hybrid bonds using induction technology is examined in this paper. An appropriate test rig was developed, assembled, commissioned and characterized for this purpose. Heating tests with titanium Ti6Al4V were carried out with this device to determine the influence of the process parameters on the temperature level and the temperature field. This applies in particular to the feed rate, the sample geometry, the relative positioning between sample and inductor as well as to the inductor setting like induction frequency and pulse width modulation. Based on the results of these examinations, a two-stage heating process was developed, which allows the formation of a homogeneous temperature field in the range of the melting and degradation temperature of the used polymer (PPS; Ten-Cate Cetex TC1100) and thus to achieve optimized bond strengths. More specifically, a short phase with a high energy input was used for quick and intensive warming and a longer time period was deployed to reach an even distribution of temperature. Subsequently, joints with CFRP were produced with a specimen geometry suitable for tensile shear tests according to DIN EN 1465 (Adhesives-determination of tensile lap-shear strength of bonded assemblies; German version EN 1465:2009, 2009). The analysis of the tensile shear strength and the fractured surfaces shows that the metal is much more difficult to heat up due to the melting enthalpy of the plastic than preliminary tests indicated. Further tests were carried out, which revealed a threshold value for heating where the temperature was sufficiently high to achieve a complete coating of the plastic on the metal can be achieved. In summary, the investigations showed that the presented method as well as the design of the test rig is generally suitable for bonding metal to thermoplastic polymers. The influence of various parameters on heating and bond strength could be identified. Moreover a process has been established, which allows industrially useful bonding forces. This not only proves that further investigations are useful, but also laid the foundation for further experiments.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Section: Requirements For the Test Rigmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Induction-based joining of titanium with thermoplastics

Lugauer¹,

Kandler²,

Meyer³

et al. 2019

Prod. Eng. Res. Devel.

Self Cite

View full text Add to dashboard Cite

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“…In this regard, the surface pretreatments such as OF LASER APPLICATIONS VOLUME 27, NUMBER S2 FEBRUARY 2015 grinding, 13 milling, 2 abrasive blasting (AB), 7 and laser processing [8][9][10][11] are applied prior to bonding. One of the most promising processes is the laser surface pretreatment, which results in a joint strength for adhesive bonds equal to anodizing and etching processes.…”

Section: B Laser Surface Pretreatment For the Metal Joining Partnermentioning

confidence: 99%

“…In contrast, a groove structure with undercuts is manufactured by the CW laser source. 10,11 The structures are analyzed with regard to their surface topography, their surface chemistry, and the resulting joint strength. Furthermore, the influence of the fiber volume content on the joint properties is investigated in this paper.…”

Section: B Laser Surface Pretreatment For the Metal Joining Partnermentioning

confidence: 99%

Laser surface pre-treatment of aluminum for hybrid joints with glass fiber reinforced thermoplastics

Heckert

Zaeh

2015

Journal of Laser Applications

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Lightweight construction is a major trend in the automotive industry. The connection of fiber reinforced plastics with aluminum is consequently seen as a promising prospect. In this regard, thermal joining is one potential joining technology for bonding of such hybrid joints. Yet a pretreatment of the aluminum surface is necessary to create a load bearing metal-plastic joint. Recent research has shown that a laser surface pretreatment provides high joint strengths. However, there is a variety of laser sources and possible surface topographies with typical structure sizes ranging from macroscopic to nanoscopic profiles. Within this work, two different laser induced structures were generated on aluminum sheets which were subsequently joined to glass fiber reinforced thermoplastics. One of the two laser structures was created with a continuous wave laser using a modified remote ablation cutting process. The other structure was manufactured by a pulsed laser source with a pulse width in the nanosecond-range. The two laser processes were compared with a conventional abrasive blasting process and they were characterized in terms of surface topography and chemical composition of the surface. Furthermore, the achievable joint strength for joining with glass fiber reinforced thermoplastics was investigated. It is shown that the properties of the thermoplastic as well as the surface topography and chemical composition of the metal strongly influence the resulting joint strength.

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“…Fusion welding is nearly impossible for thermoset CFRPs since they burn under the intense heat of the welding process. Thermoplastic CFRPs, on the other hand, allow fusion welding and thus can be a good alternative for increasing the production efficiency [4][5][6][7]. Thermoplastic CFRP has been known to exhibit lower strength and lower heat resistance compared to its thermoset counterpart, but the recent advancement of thermoplastics has removed most of its weaknesses [8].…”

Section: Introductionmentioning

confidence: 99%

Pre-Inscribed Laser Surface Pattering for Increased Joining Strength in Laser Fusion Bonding of CFRP and Zinc-Coated Steel

et al. 2019

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In this study, we present improved fusion-bonding strength results between carbon fiber-reinforced polyetheretherketone (CFR-PEEK) and zinc-coated steel through the introduction of pre-inscribed laser surface patterns. Optimized laser welding parameters, including laser power, focal position, pitch, number of passes, and clamping pressure, are presented along with parameters for producing the rectangular laser patterns. It was found that for the optimized parameters, the tensile shear strength of the welded samples is improved by as much as 100% when pre-inscribed laser patterns are present. Detailed SEM images of the fractured fusion welded joint samples after the tensile shear test are presented for analysis. The tight bonding between the polymer matrix and the zinc-coated steel inside the formed grooves is found to be the main reason behind the increased tensile shear strength. A comparison of the tensile shear loads for various joining methods is also presented and discussed.

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Laser Surface Pre-treatment of Aluminium for Hybrid Joints with Glass Fibre Reinforced Thermoplastics

Cited by 94 publications

References 9 publications

Induction-based joining of titanium with thermoplastics

Induction-based joining of titanium with thermoplastics

Laser surface pre-treatment of aluminum for hybrid joints with glass fiber reinforced thermoplastics

Pre-Inscribed Laser Surface Pattering for Increased Joining Strength in Laser Fusion Bonding of CFRP and Zinc-Coated Steel

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