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

6 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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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

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

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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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