Penetration feedback control in overlap laser welding of sheet metal

S. Postma, R.G.K.M. Aarts, A.J.F.M. Hesemans

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    Abstract

    This paper deals with a method to control the penetration depth in overlap laser welding, using feedback control. Some applications demand that an overlap weld is joined sufficiently, while it is not fully penetrated to the back side of the bottom plate. An optical sensor which measures the process radiation coaxially is used as the feedback signal. First the correlation between the penetration depth and this optical signal has been obtained. Hereafter, system identification methods have been used to obtain a dynamic model of the welding process. The model is written as a transfer function with laser power as input and the sensor signal strength as output. With this model a simple feedback controller has been designed and tested in real experiments. The laser power serves as an actuator regulating the penetration depth. It was found that the feedback control system was able to maintain a certain penetration depth, within acceptable boundaries.
    Original languageEnglish
    Title of host publicationWESIC 2001
    Subtitle of host publicationProceedings 3rd Workshop on European Scientific and Industrial Collabroration
    EditorsJ. van Amerongen, J.B. Jonker, P.P.L. Regtien
    Place of PublicationEnschede, Nederland
    PublisherDrebbel Institute for Mechatronics
    Pages495-503
    Number of pages9
    ISBN (Print)90-36516-10-2
    Publication statusPublished - 27 Jun 2001
    Event3rd Workshop on European Scientific and Industrial Collaboration, WESIC 2001 - University of Twente, Enschede, Netherlands
    Duration: 27 Jun 200129 Jun 2001
    Conference number: 3

    Workshop

    Workshop3rd Workshop on European Scientific and Industrial Collaboration, WESIC 2001
    Abbreviated titleWESIC
    CountryNetherlands
    CityEnschede
    Period27/06/0129/06/01

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