Advantages of coaxial external illumination for monitoring and control of laser materials processing

Regaard, Boris; Kaierle, Stefan; Schulz, Wolfgang; Moalem, Anas

doi:10.2351/1.5060481

Cited by 19 publications

(6 citation statements)

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“…Thus, the accuracy of these microstructure simulations is reduced as they do not have appropriate boundary conditions. Currently, highly developed techniques like CMOS camera [187,188] and synchrotron X-ray [189,190] can provide transient melt pool geometry with relatively high accuracy. These melt pool geometry reconstructions can be used as experimental validation for simulations and improve the accuracy.…”

Section: Discussion and Perspectivesmentioning

confidence: 99%

Solidification microstructure simulation of Ti-6Al-4V in metal additive manufacturing: A review

Zhou

Brochu

et al. 2020

Additive Manufacturing

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Section: Discussion and Perspectivesmentioning

confidence: 99%

Solidification microstructure simulation of Ti-6Al-4V in metal additive manufacturing: A review

Zhou

Brochu

et al. 2020

Additive Manufacturing

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“…The capabilities of a plain scanner based welding system can be considerably extended by a high speed CMOS camera, which is connected to the scanner. As already proven in setups without scanners, cameras are well suited for coaxial inline process monitoring [3,1], see Figure 1. Equipped with a diode laser for illumination at a specific wavelength, as shown in Figure 1, such setups allow image acquisition of the keyhole without being disturbed by plasma radiation.…”

Section: Introductionmentioning

confidence: 92%

Automatic calibration of a scanner-based laser welding system

Stache

Stollenwerk

Gedicke

et al. 2009

Journal of Laser Applications

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In precision engineering scanners are widely used for laser beam positioning. Equipped with cameras, scanners enable process monitoring or even position recognition of the parts to be welded. To allow precise welding or position recognition, it is essential to calibrate a welding system. Instead of calibrating the whole system, most approaches only help to adjust the laser beam position. Consequently, the varying lateral offset between the laser's focus point and the camera's field of view, due to chromatic aberration of the scanner optics. cannot be compensated. Furthermore, these approaches require manual microscopic measurement of weld seams. which comes along with several downsides. This paper proposes two techniques for automatic calibration without these downsides by use of the system-incorporated camera. The first technique is the calibration at laser wavelength. To this end, the system automatically creates laser spots, evaluates their positions and possible offsets, and finally fits an affine model for compensation. The second technique is based oil a specially coded test pattern, which is used for calibration at camera wavelengths. Experimental results confirm the accuracy of the calibration obtained

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“…The maximum cross correlation can be found easily by determining the minimum of the pixel sum of the absolute difference of the image areas ( fig. 3) [2]. This approach allows for measurement of the variables in question which cannot be derived from the machine control at the same level of reliability.…”

Section: Speed and Position Measurementmentioning

confidence: 99%

Process Monitoring and Control of Laser Beam Welding

Kaierle¹

2008

Laser Technik Journal

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THE AUTHORLaser materials processing is widely used in industry today. For a long time, the statement "the best sensor is no sensor"was mentioned often in this field of technology. However, a change of paradigm can now be observed. ISO 9000 and other by law-enforced regulations have led to the understanding that quality control is an essential tool in modern manufacturing and necessary in order to keep production results in deterministic boundaries.

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Advantages of coaxial external illumination for monitoring and control of laser materials processing

Cited by 19 publications

References 1 publication

Solidification microstructure simulation of Ti-6Al-4V in metal additive manufacturing: A review

Solidification microstructure simulation of Ti-6Al-4V in metal additive manufacturing: A review

Automatic calibration of a scanner-based laser welding system

Process Monitoring and Control of Laser Beam Welding

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