High surface quality welding of aluminum using adjustable ring-mode fiber laser

Martin Ruthandi Maina, Yasuhiro Okamoto, Akira Okada, Matti Närhi, Jarno Kangastupa, Jorma Vihinen

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


A method to improve penetration and stabilize the welding phenomenon at a high welding speed has been described through experimental and numerical investigations. Using a high power laser beam consisting of a center and a ring part, influences of shielding gas direction and flow rate, laser power density, and welding mode defined by variable intensity distribution have been clarified. The weld bead was evaluated in terms of width, height, shape and roughness. Dual-mode laser irradiation of center and ring power made it possible to stabilize the welding process. The center power helps to achieve sufficient deep penetration, while ring power ensures good temperature distribution. Good surface quality and deep penetration welding could be achieved with dual-mode welding, using low flow rate of shielding gas supplied from the backside direction.

Original languageEnglish
Pages (from-to)180-188
Number of pages9
JournalJournal of Materials Processing Technology
Publication statusPublished - Aug 2018


  • Adjustable ring-mode fiber laser
  • Aluminum
  • Laser welding
  • Shielding gas
  • Surface quality

ASJC Scopus subject areas

  • Ceramics and Composites
  • Computer Science Applications
  • Metals and Alloys
  • Industrial and Manufacturing Engineering


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