Experimental investigation of taper angle during millisecond laser drilling of 18CrNi8 steel under multiple parameters and defocused plane

Nawaz, Saira; Awan, Muhammad Bilal; Saeed, Baber; Abbas, Naseem

doi:10.1088/2053-1591/ab17a9

Cited by 10 publications

(2 citation statements)

References 33 publications

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“…Not many researchers have addressed the defocusing impact on drilling hole quality in depth [22][23][24][25][26][27]. Saad and Chao have also investigated the taper angle during millisecond laser drilling of 18CrNi8 steel under multiple parameters and defocused plane but investigation of recast layers at entrance and exits as well as molten pool splashes was not studied yet [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Effect of defocused plane on entrance and exit hole geometry of high grade steel 18CrNi8 during percussion drilling by Nd:YAG millisecond laser system

Nawaz

Kashif

Abbas

et al. 2020

Mater. Res. Express

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Modern manufacturing industries prefer laser drilling processes owing to the adequate controlled drilling in comparison with existing alternatives. The presented experimental study mainly accounts defocusing impact along with other technical parameters and optimization of Nd:YAG millisecond pulsed laser drilling; and finally their influence on the entrance and exit holes profile. The key technical parameters such as pulse frequency, pulse width and assisting gas pressure with respect to different defocused focal plane are explored experimentally for the percussion laser drilling of high grade steel 18CrNi8. Experiment results revealed that increase in defocusing distance has caused an increment in hole entrance diameter; however, with different defocusing distance, the entrance diameter increasing rate keep changing. Different trends of increasing and decreasing diameter at entrance and exit are recorded and investigated with respect to work-piece defocusing positions. The defocusing variation of laser beam has been investigated with the hole profile, changing from straight hole to tapered blind hole. Which leads to conclusive and optimized results for obtaining optimal hole profile (at entrance and exit). The optimum parametric combinations for attaining lower heat treatment effects are also discussed for superior hole quality.

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Section: Introductionmentioning

confidence: 99%

Effect of defocused plane on entrance and exit hole geometry of high grade steel 18CrNi8 during percussion drilling by Nd:YAG millisecond laser system

Nawaz

Kashif

Abbas

et al. 2020

Mater. Res. Express

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“…Bending moment (M) is equal to the product of load applied ( P max ) and horizontal distance between rollers (x = S/2). In addition, the basic phenomena's of materials fabrication for multiple applications were also explained in the literature [24][25][26][27][28][29][30][31].…”

Section: Methodsmentioning

confidence: 99%

Investigating the performance of GFRP/wood-based honeycomb sandwich panels for sustainable prefab building construction

Hussain¹,

Abbas

Zahra

et al. 2019

SN Appl. Sci.

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The static failure behavior of innovative wood-based sandwich panels with wood-based core and face sheets made of glass fiber reinforced polymer was investigated. The sandwich panels were subjected to three-point bending and compression tests to determine their strengths and their failure mechanisms. The honeycomb core of medium density fiberboard (MDF) was manufactured to reduce the weight of the whole panel as well as the consumption of wood elements. The hollow portions of the honeycomb core were filled with wheat straw to increase the heat resistance of the whole structure by maintaining a lightweight. The tests showed that the mechanical characteristics of solid MDF structures were high as compared to MDF honeycomb panels. But, MDF honeycomb structures were superior because of their capability to sustain against the load after the failure. Load absorption capabilities and strength of honeycomb sandwich panels filled with wheat straw were little improved. The major fracture modes were transverse shear, longitudinal shear, and delamination. The delamination at core and facing interface was the significant problem which can effectively be reduced by using inserts into the core above face sheets.

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Laser Drilling of Superalloys and Composites

Sarfraz

Shehab

Salonitis

et al. 2021

Springer Series in Advanced Manufacturing

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Experimental investigation of taper angle during millisecond laser drilling of 18CrNi8 steel under multiple parameters and defocused plane

Cited by 10 publications

References 33 publications

Effect of defocused plane on entrance and exit hole geometry of high grade steel 18CrNi8 during percussion drilling by Nd:YAG millisecond laser system

Effect of defocused plane on entrance and exit hole geometry of high grade steel 18CrNi8 during percussion drilling by Nd:YAG millisecond laser system

Investigating the performance of GFRP/wood-based honeycomb sandwich panels for sustainable prefab building construction

Laser Drilling of Superalloys and Composites

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