Online characterization of laser beam welds by NIR-camera observation

Dorsch, Friedhelm; Braun, Holger; Keßler, Steffen; Pfitzner, Dieter; Rominger, Volker

doi:10.1117/12.2004196

Cited by 8 publications

(2 citation statements)

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“…For economic reasons, commercial pyrometers operate with silicon, CMOS detectors (400-900 m). But a pyrometer designed for laser welding would ideally measure temperatures between room temperature and ~3000 °C (the peak temperature at the center of a superheated weld pool [7]). Unfortunately, this is not practical given the >10 20 difference in radiance between those temperatures in the visible spectrum (see Fig.…”

Section: -Color and 4-color Pyrometrymentioning

confidence: 99%

Measurement of Laser Weld Temperatures for 3D Model Input

Dagel

Grossetete

MacCallum

2016

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Laser welding is a key joining process used extensively in the manufacture and assembly of critical components for several weapons systems. Sandia National Laboratories advances the understanding of the laser welding process through coupled experimentation and modeling. This report summarizes the experimental portion of the research program, which focused on measuring temperatures and thermal history of laser welds on steel plates. To increase confidence in measurement accuracy, researchers utilized multiple complementary techniques to acquire temperatures during laser welding. This data serves as input to and validation of 3D laser welding models aimed at predicting microstructure and the formation of defects and their impact on weld-joint reliability, a crucial step in rapid prototyping of weapons components.

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Section: -Color and 4-color Pyrometrymentioning

confidence: 99%

Measurement of Laser Weld Temperatures for 3D Model Input

Dagel

Grossetete

MacCallum

2016

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“…Instruments that avoid knowledge of the emissivity like 2-color pyrometers are therefore highly desirable for measurements of absolute temperatures [8][9][10][11][12] . The main limitation of 2-color pyrometers is their limited temperature range dictated by the single band.…”

Section: Introductionmentioning

confidence: 99%

Four-color imaging pyrometer for mapping temperatures of laser-based metal processes

Dagel¹,

Grossetete²,

MacCallum³

et al. 2016

SPIE Proceedings

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A 4-color imaging pyrometer was developed to investigate the thermal behavior of laser-based metal processes, specifically laser welding and laser additive manufacturing of stainless steel. The new instrument, coined a 2x pyrometer, consists of four, high-sensitivity silicon CMOS cameras configured as two independent 2-color pyrometers combined in a common hardware assembly. This coupling of pyrometers permitted low and high temperature regions to be targeted within the silicon response curve, thereby broadening the useable temperature range of the instrument. Also, by utilizing the high dynamic range features of the CMOS cameras, the response gap between the two wavelength bands can be bridged. Together these hardware and software enhancements are predicted to expand the real-time (60 fps) temperature response of the 2x pyrometer from 600 °C to 3500 °C. Initial results from a calibrated tungsten lamp confirm this increased response, thus making it attractive for measuring absolute temperatures of steel forming processes.

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