Effect of laser beam trajectory on pocket geometry in laser micromachining

Witkowski, Grzegorz; Tofil, Szymon; Mulczyk, Krystian

doi:10.1515/eng-2020-0093

Cited by 7 publications

(10 citation statements)

References 13 publications

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“…The effect of micro-treatment was obtained by ablative removal of material from the sample surface [10] by linear beam movement. This is one of the available options to perform microtexture measurements on this laboratory stand.…”

Section: Resultsmentioning

confidence: 99%

“…The use of lasers for this purpose seems to be justified. The impact of a laser beam on the surface of different materials was the subject of many scientific manuscripts presented in numerous publications [10,11]. In these publications was discussed the influence of laser parameters (such as light wavelength, frequency of impulses, duration of the impulse, etc.)…”

Section: Introductionmentioning

confidence: 99%

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Surface Laser Micropatterning of Polyethylene Terephthalate (PET) to Increase the Shearing Strength of Adhesive Joints

Tofi

2022

Terotechnology XII

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Abstract. The method for increasing the shearing strength of adhesive joints in plastics was investigated. This method uses laser micropatterning of different construction materials to extend adhesive surfaces. In investigations, Polyethylene Terephthalate (PET) was used. TruMicro 5325c ultra-short pulse (picosecond pulse) laser and the SCANLAB GALVO scanning head applied in the research enable ablative removal of the material without the heat-affected zone (HAZ) in the rest of it. Ultra-short laser pulses (such as picosecond pulses) remove material without melting the rest of it. The presented method significantly increases the shearing strength of the formed joints in investigated materials made from plastics, which was proved in the results of laboratory tests. The laser device parameters used, which are described in this article, have not produced cracks in the microtreated materials. The research shows that bondings between elements with the appropriately machined microstructure are characterized by a severalfold increase in the strength of joints in relation to materials devoid of the microstructure. In addition, this study addresses practical solutions to the adhesive method used for joining of the polymers used for tests. This study could be helpful for each application where we have to connect these types of polymers.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface Laser Micropatterning of Polyethylene Terephthalate (PET) to Increase the Shearing Strength of Adhesive Joints

Tofi

2022

Terotechnology XII

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“…The number of controllable input variables influencing the laser ablation process and quality of the workpiece is large. The impact of these variables is not fully understood, which means that on production lines they are selected mainly by trial and error combined with experience, which causes workpiece defects in the form of burrs, carbon deposits and wide heat affected zone (HAZ) [27][28].…”

Section: Introductionmentioning

confidence: 99%

Effect of fiber and CO2 lasers parameters on the cut surface quality of RVS 1.4301 stainless steel

Bohdal

Schmidtke

2022

JMES

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The paper presents the results of experimental research related to the process of cutting of t = 3 mm and t = 6 mm thick RVS 1.4301 (AISI 304, EN X5CrNi18-10) stainless steel using a fiber and CO2 lasers. The correct selection of technological parameters and the maintenance of the machines in the right technical condition allow obtaining very high quality of the cut edge, which will not require additional mechanical treatment. However, this is a complex issue. Appropriate control of the cutting process requires knowledge about the impact of individual parameters on the process and the quality of the cut edge. The influence of selected parameters and conditions of the laser cutting process on the technological quality of the obtained product was determined. The laser power and cutting speed had a significant influence on the output factors for two cutting techniques.For cutting material with a thickness of t = 3 mm with a CO2 laser, the highest quality of the cut edge was obtained using the power values P = 4200-4300 W and cutting speed v = 2100 mm/min. For the thickness t = 6 mm, the speed values should be approximately set in range v = 1600-1800 mm/min. The power value should be selected in a range from P = 3700 W to P = 4200 W. For a fiber laser with a material thickness of t = 3 mm, the best results were obtained using speeds in the range v = 2000-3300 mm/min. For the thickness of t = 6 mm, the cutting speed must be higher and in the range v = 3500-4000 mm/min while maintaining the power of about P = 4500-4800 W. The conducted experimental research can be useful on production lines in the aspect of the correct selection of technological parameters of the process due to the adopted energy and quality criteria.

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“…Over the last decade, industry has used laser devices even more frequently [18,19], as is widely described in scientific papers from various fields [20][21][22][23][24]. Laser devices significantly facilitate the production work, among others, in the aviation, automotive and electronic industries [24,25]. Rapid development of lasers has made it possible to perform various modifications, not only in the surface layer of typical materials [22][23][24], but also those that until recently were considered difficult to machine.…”

Section: Introductionmentioning

confidence: 99%

Adhesive Joints with Laser Shaped Surface Microstructures

et al. 2021

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One of the most commonly applied methods of joining dissimilar materials is gluing. This could be mainly attributed to the applicability of this technique in various industries. The article presents a method of material surface treatment, which increases the shear strength of adhesive joints for lightweight metals such as aluminum with plastics. For this purpose, laser surface microstructuring was performed on each of the selected construction materials. As a result of the performed treatment, the active surface of the glued area was increased, which increased the adhesive strength. The picosecond laser with UV radiation used in the research is TruMicro 5325c with which material can be removed as a result of the cold ablation phenomenon. The applied parameters of the laser device did not cause thermal damage to the surface of the microstructured materials, which was confirmed by microscopic examination. Laser micromachining did not deteriorate the degree of wetting of the tested materials, either, as was confirmed by the contact angle and surface energy measurements with the use of water as the measuring liquid. In investigated cases of microstructure types, the presented method significantly increased the shear strength of the joints formed, as demonstrated by the presented strength test results. Research has shown that created joints with microstructure made according to the described method, are characterized by a significant increase in strength, up to 376%, compared to materials without microstructure. The presented results are part of a series of tests aimed at selecting the operating laser parameters for the implementation of geometric shapes of microstructures which will increase the strength of adhesive joints in selected materials.

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Effect of laser beam trajectory on pocket geometry in laser micromachining

Cited by 7 publications

References 13 publications

Surface Laser Micropatterning of Polyethylene Terephthalate (PET) to Increase the Shearing Strength of Adhesive Joints

Surface Laser Micropatterning of Polyethylene Terephthalate (PET) to Increase the Shearing Strength of Adhesive Joints

Effect of fiber and CO2 lasers parameters on the cut surface quality of RVS 1.4301 stainless steel

Adhesive Joints with Laser Shaped Surface Microstructures

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