Two new mechanisms for laser cleaning using Nd:YAG sources

Watkins, Ken; Curran, C.; Lee, Jong Myung

doi:10.1016/s1296-2074(02)01229-3

Cited by 42 publications

(20 citation statements)

References 16 publications

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“…Lasers have been used in many industrial applications such as drilling, cutting, machining and recently for surface cleaning 6 . Laser cleaning is usually considered to be one of the dry cleaning methods.…”

Section: Introductionmentioning

confidence: 99%

The effects of short pulse laser surface cleaning on porosity formation and reduction in laser welding of aluminium alloy for automotive component manufacture

Shaer

Mistry

2014

Optics & Laser Technology

127

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. (2014) The effects of short pulse laser surface cleaning on porosity formation and reduction in laser welding of aluminium alloy for automotive component manufacture. Optics and Laser Technology, 64 . pp. 162 171. ISSN 0030 3992 It is advisable to refer to the publisher's version if you intend to cite from the work. This paper reports the effects of short pulsed laser surface cleaning on the porosity formation in laser welding of AC-170PX (AA6014) aluminium sheets (coated with Ti/Zr and lubricated using a dry lubricant AlO70) with two types of joints: fillet edge and flange couch, using an AA4043 filler wire for automotive component assembly. The effect of laser cleaning on porosity reduction during laser welding using a filler wire has not been reported before. In this work, porosity and weld fusion zone geometry were examined prior to and after laser cleaning.The nanosecond pulsed Nd:YAG laser cleaning was found to reduce porosity significantly in the weld fusion zones. For the fillet edge welds, porosity was reduced to less than 0.5% compared with 10-80% without laser cleaning. For flange couch welds, porosity was reduced to 0.23 -0.8% from 0.7 -4.3% without laser cleaning. This has been found to be due to the elimination of contaminations and oxide layers that contribute to the porosity formation. The laser cleaning is based on thermal ablation.2

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Section: Introductionmentioning

confidence: 99%

The effects of short pulse laser surface cleaning on porosity formation and reduction in laser welding of aluminium alloy for automotive component manufacture

Shaer

Mistry

2014

Optics & Laser Technology

127

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“…In addition, cleaning at an angle minimizes the risk of substrate damage as compared to normal incidence for laser cleaning due to reduced fluence level. A detailed analysis of angular laser cleaning has already been provided by Vereecke et al [40] and Watkins et al [48]. In these studies, maximum cleaning efficiency was observed at grazing incidence.…”

Section: B Microscopic Analysismentioning

confidence: 98%

Study on effective cleaning of gold layer from fused silica mirrors using nanosecond-pulsed Nd:YAG laser

et al. 2013

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A study on effective laser cleaning of gold layer deposited on fused silica substrates used in beamlines of synchrotron radiation (SR) sources using nanosecond-pulsed Nd:YAG laser has been carried out. The influence of pulse duration, beam incidence angle, spot overlapping, laser fluence, and number of passes on cleaning efficiency has been investigated. An approximately 48 nm thick gold layer from a mirror surface area of ~48 cm2 has been cleaned in 3 min. Laser clean quality and efficiency has been analyzed using microscope, scanning electron microscope (SEM), and angle-dependent reflectivity measurement techniques using SR beamline. Optimization of cleaning parameters resulted in a cleaning efficiency of ~98%. This study provides an alternate and low-cost solution for reuse of gold-coated, damaged mirrors.

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“…In previous studies on the characteristics of laser ablation decontamination, Watkins et al . , in their study on the mechanism of laser decontamination with Nd:YAG sources, reported that the distance between the decontamination surface and the laser focus plays a critical role in the decontamination effectiveness by changing the pressure of the shock wave striking the surface. Lee et al .…”

Section: Introductionmentioning

confidence: 99%

Size distribution and filtration property of particles generated from laser ablation decontamination process

Jung

Park

Won

et al. 2012

Env Prog and Sustain Energy

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This study investigated the size distribution of particles generated from a laser ablation process applied for the decontamination of a hot cell contaminated with radionuclides. To simulate the hot cell contamination conditions, a stainless steel 304 (STS 304) plate on which Co and Cs ions (water soluble radionuclides, WSRs) were deposited and STS 304 specimens coated with Eu2O3 and CeO2 (water insoluble radionuclides, WIRs) were prepared. The particle size distribution and concentration for each contamination condition were then measured. In addition, the filtration characteristics of the particles produced from the laser ablation processes were examined using a high efficiency air (HEPA) filter to completely remove these particles. Under the same laser ablation conditions, the particle concentrations for the water insoluble‐contaminated specimen were higher than those for the water soluble‐contaminated specimen. The mobility diameter of particles showing the highest concentration ranged from 70 to 80 nm for all tests. For the specimens contaminated with Cs ion, when a potassium salt such as KNO3 or KOH was added, the concentration of particles generated under the same fluence increased owing to a removal in the form of Cs oxide, such as Cs2O. The overall collection efficiency of the tested HEPA filter for the particles generated from the laser ablation was over 99.4% regardless of the type of contaminated specimen. Consequently, it was confirmed that a high efficiency air filter is very effective as a means to capture particles produced from the hot cell decontamination process using laser ablation technique. © 2012 American Institute of Chemical Engineers Environ Prog, 32: 649–654, 2013

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Two new mechanisms for laser cleaning using Nd:YAG sources

Cited by 42 publications

References 16 publications

The effects of short pulse laser surface cleaning on porosity formation and reduction in laser welding of aluminium alloy for automotive component manufacture

The effects of short pulse laser surface cleaning on porosity formation and reduction in laser welding of aluminium alloy for automotive component manufacture

Study on effective cleaning of gold layer from fused silica mirrors using nanosecond-pulsed Nd:YAG laser

Size distribution and filtration property of particles generated from laser ablation decontamination process

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