Penetration control in laser welding of sheet metal using optical sensors

Sjoerd Postma, Ronald G.K.M. Aarts, Johan Meijer, Ben Jonker, Wouter M. Zweers

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    Abstract

    For economical reasons it is desirable to apply the highest possible speed during laser welding. Increasing the welding speed at a certain laser power might result in insufficient penetration of the weld. This work describes the design of a feedback controller, which is able to maintain full penetration in mild steel sheets. An optical detector, which is placed inside the Nd:YAG laser source, measures the intensity of the weld-pool radiation through the optical fibre. This sensor signal is used as input of a feedback control system. A model, which describes the dynamic response of the welding process, including the sensor and laser source dynamics, has been obtained, using system identification techniques. The input of this model is the laser power and the output is the modelled sensor signal. Based on this dynamic model a feedback controller is designed and implemented. The laser power is used as an actuator. The controller maintains full penetration during welding of tracks with disturbances like sudden speed changes. This opens the possibility to optimise the welding speed without risking lack of penetration.
    Original languageEnglish
    Title of host publicationICALEO 2001
    Subtitle of host publicationCongress proceedings, Laser Materials Processing Conference, Laser Microfabrication Conference, Jacksonville, Florida, USA
    EditorsXiangli Chen
    Place of PublicationOrlando, FL
    PublisherLaser Institute of America
    Pages1083-1092
    Number of pages10
    ISBN (Print)0-912035-73-0
    DOIs
    Publication statusPublished - 15 Oct 2001
    Event20th International Congress on Applications of Lasers & Electro-Optics, ICALEO 2001 - Jacksonville, United States
    Duration: 15 Oct 200118 Oct 2001
    Conference number: 20

    Conference

    Conference20th International Congress on Applications of Lasers & Electro-Optics, ICALEO 2001
    Abbreviated titleICALEO
    Country/TerritoryUnited States
    CityJacksonville
    Period15/10/0118/10/01

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