On-line Nd:YAG laser welding process monitoring

Jurca, Marius; Mokler, Dieter; Ruican, Radu; Zeller, Thomas

doi:10.1117/12.184742

Cited by 3 publications

(3 citation statements)

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“…Process emitted light is often measured by photodiode sensors to monitor on-line weld penetration. 5,6 More advanced sensors include charge-coupled device ͑CCD͒ or complementary metal-oxide-semiconductor ͑CMOS͒ cameras 7 or make use of sensor fusion 8 to improve the robustness. Furthermore, real-time laser welding process controllers can use the monitor system information to guarantee full penetration along the whole weld seam.…”

Section: Introductionmentioning

confidence: 99%

Design, implementation and testing of a fuzzy control scheme for laser welding

Jauregui

Aalderink

Aarts

et al. 2008

Journal of Laser Applications

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A fuzzy logic controller (FLC) scheme has been developed for laser welding. Process light emissions are measured and combined to determine the current status of the welding process. If the process is not in a desired welding state, the FLC will adapt the laser power. The FLC has been demonstrated for the laser welding of zinc coated steel sheets in an overlap configuration. Experiments showed that the controller is capable of steering the process towards full penetration keyhole welding, avoiding both blowholes as well as lack of penetration. Under the presence of different process disturbances, like changes in focal position and material thickness, the controller proved to be able to maintain full penetration keyhole welding. The architecture of the controller is generic, thus facilitating an implementation for the laser welding process of other materials or configurations.

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Section: Introductionmentioning

confidence: 99%

Design, implementation and testing of a fuzzy control scheme for laser welding

Jauregui

Aalderink

Aarts

et al. 2008

Journal of Laser Applications

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“…Nd laser welding of thin sheets using photodiodes has been demonstrated in the past [10,11,12,13,14,15]. In Figure 2.1 an overview of a typical experimental setup used for photodiode-based penetration control is given.…”

Section: Photodiode-based Fuzzy Logic Control Of Laser Weldingmentioning

confidence: 99%

“…The dichroic mirror inside this welding head is used to direct the process light to a system of three photodiodes (position 2 in Figure 2.1). The photodiodes are part of the commercially available Laser Weld Monitor (LWM) system [10,22,23,24] developed by Jurca Optoelectronik GmbH, now part of the Precitec Group [25]. In Figure 2.10 a photo is shown of the LWM system attached to the Trumpf welding head.…”

Section: Experimental Setup Flc Systemmentioning

confidence: 99%

Sensing, monitoring and control for laser based welding of aluminium sheets

Aalderink¹

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Weight reduction is important in the automotive industry. To achieve this, Tailor Welded Blanks (TWB’s) are used. Good examples are body panels consisting of sheets which are welded together and formed into the desired shape. TWB’s are thicker at highly loaded places and thinner in other areas. In contrast to steel, aluminium TWB’s have been introduced only recently. The forming of the sheets poses high requirements on the welds. Laser welding has the potential to produce these strong, yet deformablewelds.

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Optoacoustic Monitoring of Laser Beam Welding

Grad¹,

Možina²

1996

Proceedings of European Meeting on Lasers and Electro-Optics CLEOE-96

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On-line Nd:YAG laser welding process monitoring

Cited by 3 publications

References 0 publications

Design, implementation and testing of a fuzzy control scheme for laser welding

Design, implementation and testing of a fuzzy control scheme for laser welding

Sensing, monitoring and control for laser based welding of aluminium sheets

Optoacoustic Monitoring of Laser Beam Welding

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