High-power transverse flow CW CO2 laser for material processing applications

Nath, Ashish Kumar; Reghu, T.; Paul, C. P.; Ittoop, M.O.; Bhargava, Pankaj

doi:10.1016/j.optlastec.2004.04.015

Cited by 23 publications

(10 citation statements)

References 19 publications

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“…It consisted of an indigenously developed 3.5-kW CW CO 2 laser system [28], a co-axial powderfeeding nozzle with a volumetric controlled powder feeder [29] and a five-axis CNC laser workstation. Figure 2a and b presents the schematic arrangement and photograph of the experimental setup.…”

Section: Methodsmentioning

confidence: 99%

Studies on laser rapid manufacturing of cross-thin-walled porous structures of Inconel 625

Paul

Mishra

Premsingh

et al. 2011

Int J Adv Manuf Technol

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An in-house developed continuous wave CO 2 laser-based rapid manufacturing was deployed to fabricate porous structures of Inconel-625 using a new cross-thinwall fabrication strategy. Studies on the mechanical and metallurgical properties of these porous structures were carried out with laser energy per unit traverse length in the range of 150-300 kJ/m, powder fed per unit traverse length in the range of 16.67-36.67 g/m and transverse traverse index in the range of 0.7-1.3. The processing parametric dependence showed that the powder fed per unit traverse length was a predominating parameter in determining the porosity of the structures, followed by transverse traverse index and laser energy per unit traverse length. The compression testing of fabricated porous structures showed that the material had anisotropy up to 20% for 0.2% yield strength. It was found that the yield strength of the fabricated structures followed the power law and decreased from 423±8 MPa for 2.63±0.14% porosity to 226± 6.8 MPa for 11.57±0.52% porosity. Scanning electron microscopy showed that shape of the pores was triangular due to the cross-thin-wall fabrication strategy and the observed values of microhardness were in the range 256-370 VHN 0.98N . These studies are expected to augment our knowledge on the fabrication of porous structures with independent control on porosity and yield strength, which are important prerequisites for some of the prosthetic and engineering components in niche areas of applications.

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Section: Methodsmentioning

confidence: 99%

Studies on laser rapid manufacturing of cross-thin-walled porous structures of Inconel 625

Paul

Mishra

Premsingh

et al. 2011

Int J Adv Manuf Technol

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“…Laser surface treatment was carried out with an indigenously developed 10 kW continuous wave CO 2 laser system [29]. The experimental set-up consisted of a 10 kW transverse flow continuous wave CO 2 laser system, integrated with a beam delivery system and a computer-controlled workstation.…”

Section: Methodsmentioning

confidence: 99%

Development of a hard nano-structured multi-component ceramic coating by laser cladding

Masanta

Ganesh

Kaul

et al. 2009

Materials Science and Engineering: A

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“…CO 2 lasers are also characterized by the flexibility of pulse oscillation and are capable of pulse widths from nanoseconds to milliseconds, as well as CW oscillation. [1][2][3][4][5] Although there are a number of excitation methods for CO 2 lasers, a longitudinal pulse discharge has been shown to produce a tail-free short laser pulse with a pulse width of about 100 ns, similar to that of a Q-switched CO 2 laser, 6 a short laser pulse with a spike pulse width of about 100 ns, and a pulse tail length of several tens of microseconds, 6-8 or a long laser pulse with a pulse width of 10 μs to 5 ms. 6,9 In the longitudinal excitation scheme, the excitation discharge is in the direction of the laser axis, and the electrodes are well separated and have a small discharge crosssection. [6][7][8][9] The long discharge length (several tens of centimeters) provides a high breakdown voltage (>20 kV) at a low gas pressure (<10 kPa).…”

Section: Introductionmentioning

confidence: 99%

Short-pulse CO2 laser with longitudinal tandem discharge tube

Uno

Akitsu

Jitsuno

2014

Review of Scientific Instruments

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We developed a longitudinally excited CO2 laser with a tandem discharge tube. The tandem scheme was constituted of two 30-cm long discharge tubes connected with an intermediate electrode. Two parts, each consisting of a charged capacitance and a 30-cm long discharge tube, were electrically connected in parallel and switched by a spark gap. The tandem scheme produced a short laser pulse like that of a TEA-CO2 laser with a charging voltage of -24.8 kV, which was smaller than the -40.0 kV charging voltage of our previous CO2 laser. At a gas pressure of 3.8 kPa, the spike pulse width was 145 ns, the pulse tail length was 58.8 μs, the output energy was 52.0 mJ, and the spike pulse energy was 2.4 mJ. We also investigated the dependence of the laser pulse and the discharge voltage on gas pressure.

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High-power transverse flow CW CO2 laser for material processing applications

Cited by 23 publications

References 19 publications

Studies on laser rapid manufacturing of cross-thin-walled porous structures of Inconel 625

Studies on laser rapid manufacturing of cross-thin-walled porous structures of Inconel 625

Development of a hard nano-structured multi-component ceramic coating by laser cladding

Short-pulse CO2 laser with longitudinal tandem discharge tube

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