An investigation on co-axial water-jet assisted fiber laser cutting of metal sheets

Madhukar, Yuvraj K.; Mullick, Suvradip; Nath, Ashish Kumar

doi:10.1016/j.optlaseng.2015.08.003

Cited by 38 publications

(6 citation statements)

References 26 publications

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“…Additionally, presence of burnt metal was observed on the lower part of workpiece with the lowest speed. Madhukar et al [22] observed that dross height varies with the laser power and cutting speed. Yan et al [23] have investigated striation and dross free cutting on alumina sheet using fibre laser machining.…”

Section: © Smementioning

confidence: 99%

An Experimental Study on Influence of Process Parameters on Dross Properties in Laser Machining of Aisi 304 Material

Jadhav

Kumar

2019

Journal of Manufacturing Engineering

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The present paper describes an experimental study on influence of process parameters on dross properties in laser machining of AISI 304 material. Process parameters namely laser power, cutting speed and gas pressure are considered in the present work. Design of experiments is done using response surface methodology and analysis of variance is performed in order to identify significance and influence of process parameters on dross height. It is found that laser power and gas pressure are most significant parameters followed by cutting speed. Dross height increases with increase in laser power and decreases with decrease in gas pressure. On the basis of experimental analysis, a second order mathematical model is developed to predict dross height. Model predictions and experimental results are found in reasonable agreement. Further, optimization of process parameters is also performed to minimize dross height

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Section: © Smementioning

confidence: 99%

An Experimental Study on Influence of Process Parameters on Dross Properties in Laser Machining of Aisi 304 Material

Jadhav

Kumar

2019

Journal of Manufacturing Engineering

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“…Moreover, waterjet-guided laser machining equipment is generally expensive and has high maintenance costs, which limits the application of this technology in the manufacturing industry [ 25 ]. To avoid these problems, Madhukar and Mullick et al [ 26 , 27 , 28 , 29 , 30 , 31 ] proposed a coaxial waterjet-assisted laser machining method. This method is different from waterjet-guided laser machining.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Coaxial Waterjet-Assisted Laser Scanning Machining of Nickel-Based Special Alloy

Wang

Yuan

et al. 2023

Micromachines

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The problems of the recast layer, oxide layer, and heat-affected zone (HAZ) in conventional laser machining seriously impact material properties. Coaxial waterjet-assisted laser scanning machining (CWALSM) can reduce the conduction and accumulation of heat in laser machining by the high specific heat capacity of water and can realize the machining of nickel-based special alloy with almost no thermal damage. With the developed experimental setup, the laser ablation threshold and drilling experiments of the K4002 nickel-based special alloy were carried out. The effects of various factors on the thermal damage thickness were studied with an orthogonal experiment. Experimental results have indicated that the ablation threshold of K4002 nickel-based special alloy by a single pulse is 4.15 J/cm2. The orthogonal experiment results have shown that the effects of each factor on the thermal damage thickness are in the order of laser pulse frequency, waterjet speed, pulse overlap rate, laser pulse energy, and focal plane position. When the laser pulse energy is 0.21 mJ, the laser pulse frequency is 1 kHz, the pulse overlap is 55%, the focal plane position is 1 mm, and the waterjet speed is 6.98 m/s, no thermal damage machining can be achieved. In addition, a comparative experiment with laser drilling in the air was carried out under the same conditions. The results have shown that compared with laser machining in the air, the thermal damage thickness of CWALSM is smaller than 1 μm, and the hole taper is reduced by 106%. There is no accumulation and burr around the hole entrance, and the thermal damage thickness range is 0–0.996 μm. Furthermore, the thermal damage thickness range of laser machining in the air is 0.499–2.394 μm. It has also been found that the thermal damage thickness is greatest at the entrance to the hole, decreasing as the distance from the entrance increases.

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“…17 In order to weaken the heat-affected zone, recast layers, and micro crack of laser processing on the material surface, there have been increasing studies on waterassisted laser micro-machining. The water-assisted laser micro-machining technologies include underwater laser processing, 18,19 water jet-guided laser processing, 20,21 and water jet-assisted laser processing. 22,23 For the above three water-assisted laser machining methods, the water takes cooling effect and flushes the material debris or the molten material away.…”

Section: Introductionmentioning

confidence: 99%

Non‐damage deep etching of SiC by hybrid laser‐high temperature chemical processing

Wang

Han

Ehrhardt

et al. 2022

Int J Applied Ceramic Tech

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SiC is considered as preferred material for micro‐electro‐mechanical system in the future. The excellent mechanical property and chemical stability make it difficult to perform deep etching. The hybrid laser‐high temperature chemical etching is investigated to realize non‐damage deep etching of SiC. The influences of defocus, laser pulse interval, laser intensity, and pulse number on etching depth are researched. The optimized laser parameter for SiC non‐damage deep etching is laser intensity of 10 × 109 W/cm2 with a pulse interval of 10 ms. In order to analyze the interaction mechanism, the temperature field and laser‐induced liquid jet in the liquid environment are calculated numerically. It is concluded that the material removal mechanism consists of laser heating vaporization during laser pulse, mechanical effect of laser‐induced liquid jet impact between two adjacent laser pulses and chemical etching in laser‐induced local high‐temperature environment. The chemical reaction between SiC and mixture of HF, and HNO3 solution produces gases and fluosilicic acid and effectively reduces the roughness of the modified layer making the surface smoother, and also removes the microcracks on the side wall of the etched region.

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An investigation on co-axial water-jet assisted fiber laser cutting of metal sheets

Cited by 38 publications

References 26 publications

An Experimental Study on Influence of Process Parameters on Dross Properties in Laser Machining of Aisi 304 Material

An Experimental Study on Influence of Process Parameters on Dross Properties in Laser Machining of Aisi 304 Material

Experimental Study on Coaxial Waterjet-Assisted Laser Scanning Machining of Nickel-Based Special Alloy

Non‐damage deep etching of SiC by hybrid laser‐high temperature chemical processing

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