Online NIR diagnostic of laser welding processes and its potential for quality assuring sensor systems

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

doi:10.1117/12.2041268

Cited by 7 publications

(3 citation statements)

References 5 publications

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“…Therefore, a further study to choose optimal values of SWIR imaging system parameters is required. 10.21611/qirt.2018.001 a) b) Fig. 12.…”

Section: Impact Of Shielding Gas On Temperature Measurementmentioning

confidence: 97%

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Thermal imaging of laser powder interaction zone in Ultra-High Speed Laser Cladding process

Koruba¹,

Reiner²

2018

Proceedings of the 2018 International Conference on Quantitative InfraRed Thermography

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Laser cladding process is a coating deposition technology, where the layer of additional material is cladded due to interaction of powder particles with laser heat source and melt pool. The monitoring of interaction between laser beam and powder became more vital in specific Ultra-High Speed Laser Cladding process, since the cladding speed requires particles to be melted before reaching the substrate. Therefore, this paper presents the preliminary study of lateral measurement of powder concentration under the cladding nozzle and its temperature distribution during the process. Moreover, the evaluation of used spectral bands for observation of laser-powder interaction was carried out.

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“…Therefore, a further study to choose optimal values of SWIR imaging system parameters is required. 10.21611/qirt.2018.001 a) b) Fig. 12.…”

Section: Impact Of Shielding Gas On Temperature Measurementmentioning

confidence: 97%

“…In case of NIR/SWIR spectral band, there was presented a possibility of laser welding online diagnostic [10]. The authors emphasized that the NIR camera allows visualizing and detecting the common flaws and defects within laser 2 welding process as well as gives images with higher contrast than VIS camera.…”

Section: Introductionmentioning

confidence: 99%

Thermal imaging of laser powder interaction zone in Ultra-High Speed Laser Cladding process

Koruba¹,

Reiner²

2018

Proceedings of the 2018 International Conference on Quantitative InfraRed Thermography

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“…On the other hand, process emission offers different information that are usually related with defects formation or particular process behaviours [3]. Different emission bands can be used to highlight different phenomena such as spatter emission or melt pool shape [4][5].…”

Section: Introductionmentioning

confidence: 99%

Estimation of melt pool size by complementary use of external illumination and process emission in coaxial monitoring of selective laser melting

Pacher

Mazzoleni

Caprio

et al. 2019

Journal of Laser Applications

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Coaxial imaging of melt pool dynamics provides several advantages over other monitoring methods in SLM. The ability to track the processing zone ensures the possibility to observe defect formation dynamics mainly related to melting and solidification. Commonly, the melt pool dynamics are observed by means of process emission. In process emission images, geometrical information of the melt pool are not directly available and their extraction would require the use of a calibrated sensor in order to measure the temperature levels; as a consequence commonly an arbitrary threshold is applied to the image. The use of external illumination for monitoring purposes allows for suppressing the process emission and observing the melt pool geometry by means of the reflected light. On the other hand, the obtained images show lower contrast and can be difficult to process by means of image processing algorithms. Accordingly, this work proposes the complementary use of external illumination and process emission for characterizing the melt pool dynamics in SLM. For the purpose, an open SLM platform with an inhouse designed coaxial monitoring module is used. Images with external illumination were used to estimate the melt pool size for AISI 316L. The information was used to set a threshold value for determining the melt pool size observed at the near infrared emission band. The proposed strategy proved promising for real time monitoring and control applications and can represent a feasible solution for industrial systems.

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A review of high energy density beam processes for welding and additive manufacturing applications

et al. 2021

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Online NIR diagnostic of laser welding processes and its potential for quality assuring sensor systems

Cited by 7 publications

References 5 publications

Thermal imaging of laser powder interaction zone in Ultra-High Speed Laser Cladding process

Thermal imaging of laser powder interaction zone in Ultra-High Speed Laser Cladding process

Estimation of melt pool size by complementary use of external illumination and process emission in coaxial monitoring of selective laser melting

A review of high energy density beam processes for welding and additive manufacturing applications

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