Effect of single pulsed picosecond and 100 nanosecond laser cleaning on surface morphology and welding quality of aluminium alloy

Zhou, Cong; Li, Honggeng; Chen, Genyu; Wang, Gang; Shan, Zizhao

doi:10.1016/j.optlastec.2020.106197

Cited by 45 publications

(26 citation statements)

References 14 publications

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“…According to above results, it can be concluded that the safe power intensity for the cleaning of ductile iron substrate is about 320 W, corresponding to 10.86 J/cm 2 (1.086 × 10 8 W/cm 2 ), which is close to the calculated result. According to literatures [10,[23][24][25], the thick surface layer can be completely removed by increasing cleaning times. us, in following experiments, average laser power is adjusted to 320 W and other parameters are kept the same with prior experiments.…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

“…Chemical etching [7] is not suitable for the removal of graphite particles due to their chemical stability. Recently, laser cleaning technique has been developed as a novel method to remove surface contaminants [8][9][10][11]. Comparing with traditional surface treatment techniques, laser cleaning is environmentally friendly for direct removal of contaminants without altering or affecting properties of matrix.…”

Section: Introductionmentioning

confidence: 99%

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Cleaning of Graphite Particles Embedded in the Surface of Ductile Iron by Using a Novel Method

Jia

Miao

Jiang

et al. 2021

Mathematical Problems in Engineering

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Ductile iron has unique mechanical property and has been widely used in many industrial applications, e.g., engine cylinder covers, crank axles, and machine tool beds and cams. The welding performance of ductile iron is normally influenced by graphite particles in the surface of ductile iron, which needs to be removed before welding. In this article, laser cleaning technique was developed to remove graphite particles implanted in the surface of ductile iron. Laser cleaning parameters and the damage threshold value of the substrate were investigated by using a pulsed Nd: YAG laser. The optimized laser cleaning parameters were obtained to achieve high-quality cleaning effect and avoid the formation of the oxide layer. Surface morphologies and elemental compositions of specimens before and after laser cleaning were characterized by scanning electron microscopy and energy-dispersive X-ray spectroscopy. Results indicated that graphite particles implanted in the surface of ductile iron were removed completely and efficiently by using the pulsed laser without the protection of inert gas atmosphere, and surface oxidation was not observed during the laser cleaning process.

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Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cleaning of Graphite Particles Embedded in the Surface of Ductile Iron by Using a Novel Method

Jia

Miao

Jiang

et al. 2021

Mathematical Problems in Engineering

View full text Add to dashboard Cite

show abstract

“…According to results from Zhou at al. [1], the laser cleaning pre-treatment can effectively improve the quality of the surface formation of the aluminium alloy weld (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

“…Laser cleaning in air/argon can greatly reduce the weld seam porosity of the aluminium alloy. The weld seam porosity of the aluminium alloy after laser cleaning in argon is the lowest [1]. Most recommendations related to technology modifications rely on laser beam oscillation with very high frequency what creates wider molten pool and brings higher stability to welding process.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Surface Roughness on Laser Beam Welding of Aluminium Alloys

et al. 2021

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A laser beam is the light that is subject to the laws of physics. Surface roughness can cause that the light can be reflected in different angles. Therefore, the surface roughness may influence the amount of light to be reflected so the power of the laser could be lowered. Present paper analyses the influence of different surface roughness on porosity and geometry of weld joint using design of experiment. Surface roughness monitored during the experiment was in the range from Ra 0.8 to Ra 15 achieved and by machining on aluminium-lithium alloy AW2099. In order to keep the same condition for welding the bead on plate welds were realised. Porosity was analysed using computer tomography. Surface roughness proved to have minor influence on porosity as well as the shape of the weld joint.

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“…Picosecond laser is a laser with a pulse width of picosecond. With short pulse width, adjustable repetition frequency and high pulse energy, it has the advantages of both nanosecond laser and femtosecond laser, and at the same time reduces the transition processing caused by intense heat effect of nanosecond laser [7].…”

Section: Introductionmentioning

confidence: 99%

9‐5: Picosecond‐Laser Blackening of TFT Side Films: A New Technology for Bright‐Pixel Repair

Han

Wang

et al. 2021

Symp Digest of Tech Papers

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In this paper, for the first time, picosecond laser was used to blacken the TFT side of LCD panel pixels. And this is a new technology to repair the bright pixel. The purpose of shading was successfully realized and the effect of darkening was achieved. And through a series of characterization to explore the mechanism of film darkening: laser through the TFT substrate glass, a part of the ITO film falls off and is formed by the laser impact into the Si3Nx film, the reduction reaction occurs with H in Si3N4 to produce black InO and SnO, Thus, the transmittance of the film is reduced and pixel shading is completed.

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Effect of single pulsed picosecond and 100 nanosecond laser cleaning on surface morphology and welding quality of aluminium alloy

Cited by 45 publications

References 14 publications

Cleaning of Graphite Particles Embedded in the Surface of Ductile Iron by Using a Novel Method

Cleaning of Graphite Particles Embedded in the Surface of Ductile Iron by Using a Novel Method

The Influence of Surface Roughness on Laser Beam Welding of Aluminium Alloys

9‐5: Picosecond‐Laser Blackening of TFT Side Films: A New Technology for Bright‐Pixel Repair

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