Laser Welding of Transparent Polymers by Using Quasi-simultaneous Beam Off-setting Scanning Technique

Saara Ruotsalainen, Petri Laakso, Veli Kujanpää

    Research output: Contribution to journalArticleScientificpeer-review

    7 Citations (Scopus)

    Abstract

    Traditionally laser polymer welding has been done by using lasers with wavelength of c. 1 μm wavelength. With this wavelength one of the pair of polymers to be joined needs to be transparent and one absorbing, usually clear and black, respectively. Joining of two transparent polymers with laser has been possible only by using absorbing additive between the samples or by doping the polymer with absorbing additive. During the last years lasers with new wavelengths between 1.4 to 2 μm have been developed. With this wavelength range welding of the transparent polymer to another transparent one without any absorbing additives is now possible. In this paper joining of transparent to transparent polymers with quasi-simultaneous laser welding (QSLW) technique and fibre lase with wavelength of 1.94 μm is studied. Also a new scanning technique for QSLW is introduced. In this technique laser beam path is off-setting to a different place in every scanning round. This way the Gaussian beam shape of fibre laser can be smoothened to be more suitable for polymer welding and more flexibility on laser welding of polymers is achieved without losing the benefits of quasi-simultaneous laser welding.
    Original languageEnglish
    Pages (from-to)272-284
    JournalPhysics Procedia
    Volume78
    DOIs
    Publication statusPublished - 24 Nov 2015
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    laser welding
    scanning
    polymers
    welding
    wavelengths
    lasers
    fiber lasers
    flexibility
    laser beams
    fibers

    Keywords

    • laser polymer welding
    • transparent polymers
    • new wavelengths

    Cite this

    Ruotsalainen, Saara ; Laakso, Petri ; Kujanpää, Veli. / Laser Welding of Transparent Polymers by Using Quasi-simultaneous Beam Off-setting Scanning Technique. In: Physics Procedia. 2015 ; Vol. 78. pp. 272-284.
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    title = "Laser Welding of Transparent Polymers by Using Quasi-simultaneous Beam Off-setting Scanning Technique",
    abstract = "Traditionally laser polymer welding has been done by using lasers with wavelength of c. 1 μm wavelength. With this wavelength one of the pair of polymers to be joined needs to be transparent and one absorbing, usually clear and black, respectively. Joining of two transparent polymers with laser has been possible only by using absorbing additive between the samples or by doping the polymer with absorbing additive. During the last years lasers with new wavelengths between 1.4 to 2 μm have been developed. With this wavelength range welding of the transparent polymer to another transparent one without any absorbing additives is now possible. In this paper joining of transparent to transparent polymers with quasi-simultaneous laser welding (QSLW) technique and fibre lase with wavelength of 1.94 μm is studied. Also a new scanning technique for QSLW is introduced. In this technique laser beam path is off-setting to a different place in every scanning round. This way the Gaussian beam shape of fibre laser can be smoothened to be more suitable for polymer welding and more flexibility on laser welding of polymers is achieved without losing the benefits of quasi-simultaneous laser welding.",
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    Laser Welding of Transparent Polymers by Using Quasi-simultaneous Beam Off-setting Scanning Technique. / Ruotsalainen, Saara; Laakso, Petri; Kujanpää, Veli.

    In: Physics Procedia, Vol. 78, 24.11.2015, p. 272-284.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Laser Welding of Transparent Polymers by Using Quasi-simultaneous Beam Off-setting Scanning Technique

    AU - Ruotsalainen, Saara

    AU - Laakso, Petri

    AU - Kujanpää, Veli

    PY - 2015/11/24

    Y1 - 2015/11/24

    N2 - Traditionally laser polymer welding has been done by using lasers with wavelength of c. 1 μm wavelength. With this wavelength one of the pair of polymers to be joined needs to be transparent and one absorbing, usually clear and black, respectively. Joining of two transparent polymers with laser has been possible only by using absorbing additive between the samples or by doping the polymer with absorbing additive. During the last years lasers with new wavelengths between 1.4 to 2 μm have been developed. With this wavelength range welding of the transparent polymer to another transparent one without any absorbing additives is now possible. In this paper joining of transparent to transparent polymers with quasi-simultaneous laser welding (QSLW) technique and fibre lase with wavelength of 1.94 μm is studied. Also a new scanning technique for QSLW is introduced. In this technique laser beam path is off-setting to a different place in every scanning round. This way the Gaussian beam shape of fibre laser can be smoothened to be more suitable for polymer welding and more flexibility on laser welding of polymers is achieved without losing the benefits of quasi-simultaneous laser welding.

    AB - Traditionally laser polymer welding has been done by using lasers with wavelength of c. 1 μm wavelength. With this wavelength one of the pair of polymers to be joined needs to be transparent and one absorbing, usually clear and black, respectively. Joining of two transparent polymers with laser has been possible only by using absorbing additive between the samples or by doping the polymer with absorbing additive. During the last years lasers with new wavelengths between 1.4 to 2 μm have been developed. With this wavelength range welding of the transparent polymer to another transparent one without any absorbing additives is now possible. In this paper joining of transparent to transparent polymers with quasi-simultaneous laser welding (QSLW) technique and fibre lase with wavelength of 1.94 μm is studied. Also a new scanning technique for QSLW is introduced. In this technique laser beam path is off-setting to a different place in every scanning round. This way the Gaussian beam shape of fibre laser can be smoothened to be more suitable for polymer welding and more flexibility on laser welding of polymers is achieved without losing the benefits of quasi-simultaneous laser welding.

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    KW - transparent polymers

    KW - new wavelengths

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    DO - 10.1016/j.phpro.2015.11.038

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    JF - Physics Procedia

    SN - 1875-3884

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