Aalderink, B.J.

Aarts, R.G.K.M.

Jonker, J.B.

Meijer, J.

English

University of Twente Research Information

Most of the emitted light appears to be temperature radiation and only a few weak emission lines are visible. It can thus be concluded that the weld plume is only weakly ionized. Since the measurements were not calibrated and the wavelength dependant emissivity is unknown, no quantitative conclusions can be drawn from these measurements.In the CuNI90/10 and the FeP04 spectra the measurement angle is closer to the sample normal. Apparently these welding processes behave more like a specular reflector than a diffuse reflector.· AA5182 reflects the most Nd:YAG radiation, followed by CuNi90/10 and then  FeP04.· The weld plume is weakly ionized.· For FeP04 and CuNi90/10  the weld pool behaves like a specular reflector.· The presented spectral data can aid greatly in the design of a monitoring system1.     B.J. Aalderink, R.G.K.M. Aarts, J.B. Jonker, J. Meijer. Weld          Plume Emissions During Nd:YAG Laser Welding,         Proceedings of LIM'05, 2005.2.     B.J. Aalderink, R.G.K.M. Aarts, J.B. Jonker, J. Meijer. Study            o f  the Optical Emissions During Nd:YAG Laser Welding of         AA5182, Proceedings of ICALEO '04, 2004.the Nd:YAG peak is stronger when ConclusionsReferencesIntroductionExperimental SetupResultsFor an optimal design of an optical monitoring system for the laser welding process, it is essential to know  the  spectral content of the emitted light. Due to the material dependancy of the emission spectrum and the limited number of publication dealing with the spectroscopic analysis of the laser welding process, broadband spectroscopic measurements of AA5182, FeP04 and CuNi90/10 were carried out. In figure 1 a schematic overview of the measurement setup is given. The experiments were carried out using 1.1 mm  AA5182, 1.0 mm FeP04 and 1.0 mm CuNi90/10 plates in a bead-on-plate configuration. Process settings are: 2 kW of CW Nd:YAG laser power, a welding speed of 60 mm/s (3.6 m/min) and a spot size of 0.45 mm, resulting in a keyhole welding mode for all materials. An argon environment prevented oxidation during welding.     Spectroscopic measurements are taken from three different positions with a  spectrometer that has a linear uncalibrated CCD array with a wavelength range of 200 to 1100 nm and a resolution of 2 nm.In figure 2 the resulting normalized spectra for the three measurement positions and the three different materials are given. It can be seen that the Nd:YAG peak around 1064 nm is the strongest for AA5182, followed by CuNi90/10. This indicates that during welding AA5182 reflects the most Nd:YAG radiation and that FeP04 reflects the least.Contact info:b.aalderink@nimr.nlWeld Plume Emissions During Nd:YAG Laser Welding1 2 2 2B.J. Aalderink , R.G.K.M. Aarts , J.B. Jonker , J. Meijer1 Netherland Institute for Metals Research, P.O. Box 5008, 2600 GA Delft, the Netherlands2 University of Twente, Laboratory of Mechanical Automation, P.O. Box 217, 7500 AE, Enschede, The NetherlandsFigure 1: Overview of the setup for the spectroscopic measurements. Figure 2: The normalized uncalibrated spectra for position I (top), position II (middle) and position III (bottom) averaged over 20 measurements.Laser sourceWelding headGas nozzlePosition IIIPosition IPosition IISpectrometerManipulatorWavelength [nm]Intensity [a.u.]AA5182FeP04CuNi90

Weld plume emissions during Nd:YAG laser welding

Spectroscopic diagnostics on CW-laser welding plasmas of aluminium alloys. Spectrochimica Acta Part B

Spectroscopic Studies on Laser Induced Plume of Aluminium Alloys. In:

W.W.:Real Time Optical Spectral Monitoring of Laser Welding Plumes. In:

http://purl.utwente.nl/publications/52666

Weld Plume Emissions During Nd:YAG Laser Welding

Weld Plume Emissions During Nd:YAG Laser Welding

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