Cutting and welding applications of high power Nd:YAG lasers with high beam quality

Hack, Rüdiger; Dausinger, Friedrich; Hügel, H.

doi:10.2351/1.5058791

“…A comparison of these data with Nd:YAG cutting data from Ref. 18 indicates that COIL and Nd:YAG cut steel at approximately the same rate (not shown). Since the wavelength of COIL (1.315 mm) and Nd:YAG (1.06 mm) are roughly the same, this is not a surprising result.…”

Section: Aluminum and Carbon Steel Experiments And Comparison With Otmentioning

confidence: 75%

“…Figure 3 presents a comparison of inert gas assist steel cutting with a COIL versus that with a CO 2 laser. 18 Most importantly, this figure shows that COIL cuts steel faster than CO 2 by approximately a factor of 3 for a fixed d/P and w k . A comparison of these data with Nd:YAG cutting data from Ref.…”

Section: Aluminum and Carbon Steel Experiments And Comparison With Otmentioning

confidence: 79%

Experimental study of cutting thick aluminum and steel with a chemical oxygen–iodine laser using an N2 or O2 gas assist

Carroll

¹

,

Rothenflue

²

1997

Journal of Laser Applications

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A chemical oxygen-iodine laser (COIL) was used for cutting aluminum and carbon steel. Cut depths of 20 mm were obtained in aluminum and 41 mm in carbon steel using an N 2 gas assist and 5-6 kW of power on target. The same laser at the same power level produced a cut depth of 65 mm in carbon steel with an O 2 gas assist; a low quality cut to a depth of nearly 100 mm in carbon steel was demonstrated. These data are compared with existing COIL and CO 2 laser cutting data. COIL cuts carbon steel and stainless steel at approximately the same rate. For a given cut depth, power and spot size, COIL cuts steel approximately three times faster than a CO 2 laser using an inert gas assist. COIL cutting speeds in carbon steel are improved by approximately a factor of three when an O 2 assist is used in lieu of an N 2 gas assist. With an N 2 gas assist, COIL cuts aluminum at approximately the same rate as CO 2 cuts steel. To improve the agreement between data and an existing theoretical cutting model, an empirical correction factor was added to the model; this modification provides excellent agreement with data.

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“…For cutting applications, higher irradiance than those used for welding are required. When step-index fibers are used, the (near) top-hat profile and stable spot size resemble the ideal "laser knife" for cutting producing smooth kerfs [19], [20]. The gradient-index fiber producing substantially higher irradiance is suited for thicker sections or faster cutting for a given laser beam power.…”

Section: Application Considerationsmentioning

confidence: 99%

Understanding high-power fiber-optic laser beam delivery

Hunter

¹

,

Leong

²

,

Miller³

et al. 1996

Journal of Laser Applications

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Fiber-optic beam delivery is commonly used on industrial laser systems. This article examines the conditions for the optimal propagation of high power beams through optical fibers. Beam quality effects by step and gradient index fibers of different lengths are considered. The differences between the diverging beam from a fiber and the beam at focus and on the fiber face are illustrated. Estimates are provided of the worst-case beam quality to be expected from fibers. Guidelines are also provided for the selection of beam delivery components based on the limitations of the optical system and the tasks to be performed.

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“…The cut speeds varied from 0.03 to 1.0 rn/mm. 18 Most importantly, this figure shows that COIL cuts steel faster than CO2 by approximately a factor of 3 for a fixed dIP and Wk. The average kerf widths were 1.65-2.54 mm with the larger kerf widths occurring for the slower cutting velocity cases.…”

Section: Aluminum and Carbon Steel Experiments And Comparison With Otmentioning

confidence: 80%

“…As expected, for a relatively constant power level (5.7-6.5 kW) and spot size, as the the scanning speed increases, the cut depth decreases. 18 indicates that COIL and Nd:YAG cut steel at approximately the same rate (not shown). It is clear from Fig.…”

Section: Aluminum and Carbon Steel Experiments And Comparison With Otmentioning

confidence: 86%

Experimental study of cutting thick aluminum and steel with a chemical oxygen-iodine laser using an N 2 or O 2 gas assist

Carroll

¹

,

Rothenflue²

1997

View full text Add to dashboard Cite

A chemical oxygen-iodine laser (COIL) was used for cutting aluminum and carbon steel. Cut depths of 20 mm were obtained in aluminum and 41 mm in carbon steel using an N2 gas assist and 5-6 kW of power on target. The same laser at the same power level produced a cut depth of 65 mm in carbon steel with an 02 gas assist; a low quality cut to adepth cf nearly 100 mm in carbon steel was demonstrated. These data are compared with existing COIL and CO2 laser cutting data. COIL cuts carbon steel and stainless steel at approximately the same rate. For a given cut depth, power and spot size, COIL cuts steel approximately three times faster than a CO2 laser using an inert gas assist. COIL cutting speeds in carbon steel are improved by approximately a factor ofthree when an 02 assist is used in lieu of an N2 gas assist. With an N2 gas assist, COIL cuts aluminum at approximately the same rate as CO2 cuts steel. To improve the agreement between data and an existing theoretical cutting model, an empirical correction factor was added to the model; this modification provides excellent agreement with data.Recently, COIL cutting data has appeared in the literature. Atsuta et al.16 obtained the first results for cutting stainless steel which were quite promising. Kar et al.17 produced a more complete data base for stainless steel cutting with an inert gas assist. This work extends the COIL cutting data base to include data for cutting aluminum and carbon steel with 758 SPIE Vol. 3092 • 0277-786X/971$10.00 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/23/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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Cutting and welding applications of high power Nd:YAG lasers with high beam quality

Cited by 6 publications

References 2 publications

Experimental study of cutting thick aluminum and steel with a chemical oxygen–iodine laser using an N2 or O2 gas assist

Experimental study of cutting thick aluminum and steel with a chemical oxygen–iodine laser using an N2 or O2 gas assist

Understanding high-power fiber-optic laser beam delivery

Experimental study of cutting thick aluminum and steel with a chemical oxygen-iodine laser using an N 2 or O 2 gas assist

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