Experiments Regarding the Influence of Pressure Profiling on Laser-Transmission Welding

Potente, H.; Schöppner, Volker; Bonefeld, Dirk; Wilke, L.; Hage, Christoph

doi:10.1007/bf03321136

Cited by 10 publications

(6 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Welding tests with the parameter set PII were performed using P L of 340 W and a clamping force of 2400 N. Figure 9b shows that reducing the P L by 30 W from the Welding experiments using the parameter set PIII were performed with a 10 W higher laser power of 350 W and a clamping force of 2700 N. Similar results were obtained in the case described above, where no pores or other defects such as cracks or burn marks were detected in the weld (Fig. 9c), and only a slightly reduced heating time was observed during sample formation, with a minimum heating time of 4.7 s. A targeted meltdown can be achieved faster with higher laser power [20].…”

Section: Effect Of Position Correction and Laser Powersupporting

confidence: 79%

Laser beam positioning in quasi-simultaneous laser transmission welding of polymers

Jankus¹,

Bendikienė²

2022

PEAS

View full text Add to dashboard Cite

Laser transmission welding (LTW) technology is widely used in the automotive, medical, electronic device industries, and for joining complex polymer assemblies. LTW offers unique advantages in weld quality and mechanical properties compared to conventional polymer welding processes [1][2][3][4][5][6].LTW performance depends on material properties, process parameters, laser irradiation, and application strategies. Various laser irradiation strategies have been developed and implemented in laser welding, varying in laser scanning techniques, cycle times, and process flexibility. Welding is influenced by the laser irradiation methods that define the process capabilities, including weld profile, part size, part variety, and cycle time. The four main variations of LTW are contour, simultaneous, quasi-simultaneous, and mask welding techniques [2-4]. In the contour LTW technique, the laser beam moves along the predefined weld path to form the weld, being the simplest LTW variant. In simultaneous laser welding, the joint is achieved using a precise arrangement of laser diode modules that simultaneously irradiate the entire weld contour. The joint configuration can be welded using special beam-shaping diffractive optical elements (DOE), avoiding the complex arrangement of laser modules along the laser weld contour. In the quasi-simultaneous laser welding (QSLW) technique, the laser beam passes through the parts to be welded several times at very high speed. By using the galvo mirror system, the laser beam is directed according

show abstract

Section: Effect Of Position Correction and Laser Powersupporting

confidence: 79%

Laser beam positioning in quasi-simultaneous laser transmission welding of polymers

Jankus¹,

Bendikienė²

2022

PEAS

View full text Add to dashboard Cite

show abstract

“…Further studies are needed to clarify this point. Overall, the strength of our assemblies is higher than those achieved by Potente et al when welding PEEK T-joint specimens with similar thicknesses for the transparent substrate [18]. They achieved a maximum strength of 40 MPa, while our minimum is of the same value for both types of assemblies.…”

Section: Fig 6 A4/sc-p2 Assembly Cross-section Along the Welding Path...contrasting

confidence: 46%

Laser transmission welding of PEKK: Influence of material properties and process parameters on the weld strength

AGUIRRE

2023

Materials Research Proceedings

View full text Add to dashboard Cite

Abstract. Laser transmission welding (LTW) is a suitable process for assembling thermoplastic materials. This joining process is use to assembly most thermoplastics, but high-performance thermoplastics, such as polyetherketoneketone (PEKK), have received less attention until now. The present work deals with joining PEKK parts by LTW in amorphous over semi-crystalline state configuration. The optical properties of amorphous and semi-crystalline states were measured. The effect of the upper part thickness (2 or 4 mm) and those of the laser power reaching the interface was assessed through the determination of the heat affected zone (HAZ) dimensions and the mechanical resistance of the bonds. Single lap shear (SLS) tests were conducted to investigate the influence of the process parameters on the interfacial strength and to validate the weld quality. The highest LSS is obtained around 60 MPa. When increasing the laser power, the dimensions of the HAZ increase, and the mechanical strength decreases.

show abstract

“…For the sake of brevity, only the second group is presented in this article. Moreover, the presence of water within the specimens has been proved to be detrimental to the joint integrity and mechanical resistance of welds [38]. For this reason, careful drying is necessary before assembling the specimens.…”

Section: Characterization Of Materialsmentioning

confidence: 99%

Assembling of Carbon Fibre/PEEK Composites: Comparison of Ultrasonic, Induction, and Transmission Laser Welding

et al. 2022

View full text Add to dashboard Cite

In the present work, an ultrasonic, an induction, and a through transmission laser welding were compared to join carbon fibre reinforced polyetheretherketone (CF/PEEK) composites. The advantages and drawbacks of each process are discussed, as well as the material properties required to fit each process. CF/PEEK plates were consolidated at 395 °C with an unidirectional sequence and cross-stacking ply orientation. In some configurations, a polyetherimide (PEI) layer or substrate was used. The thermal, mechanical, and optical properties of the materials were measured to highlight the specific properties required for each process. The drying conditions were defined as 150 °C during at least 8 h for PEI and 24 h for CF/PEEK to avoid defects due to water. The optical transmission factor of PEI is above 40% which makes it suitable for through transmission laser welding. The thermal conductivity of CF/PEEK is at most 55 W·(m·K)−1, which allows it to weld by induction without a metallic susceptor. Ultrasonic welding is the most versatile process as it does not necessitate any specific properties. Then, the mechanical resistance of the welds was measured by single lap shear. For CF/PEEK on CF/PEEK, the maximum lap shear strength (LSS) of 28.6 MPa was reached for a joint obtained by ultrasonic welding, while an induction one brought 17.6 MPa. The maximum LSS of 15.2 MPa was obtained for PEI on CF/PEEK assemblies by laser welding. Finally, interfacial resistances were correlated to the fracture modes through observations of the fractured surfaces. CF/PEEK on CF/PEEK joints resulted in mixed cohesive/adhesive failure at the interface and within the inner layers of both substrates. This study presents a guideline to select the suitable welding process when assembling composites for the aerospace industry.

show abstract

Experiments Regarding the Influence of Pressure Profiling on Laser-Transmission Welding

Cited by 10 publications

References 3 publications

Laser beam positioning in quasi-simultaneous laser transmission welding of polymers

Laser beam positioning in quasi-simultaneous laser transmission welding of polymers

Laser transmission welding of PEKK: Influence of material properties and process parameters on the weld strength

Assembling of Carbon Fibre/PEEK Composites: Comparison of Ultrasonic, Induction, and Transmission Laser Welding

Contact Info

Product

Resources

About