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

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Pages (from-to)180-188
Number of pages9
JournalJournal of Materials Processing Technology
Volume258
DOIs
Publication statusPublished - 1 Aug 2018
Publication typeA1 Journal article-refereed

Abstract

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.

Keywords

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

Publication forum classification

Field of science, Statistics Finland