TY - JOUR A1 - Üstündag, Ömer A1 - Bakir, Nasim A1 - Gumenyuk, Andrey A1 - Rethmeier, Michael T1 - Influence of oscillating magnetic field on the keyhole stability in deep penetration laser beam welding T2 - Optics and Laser Technology N2 - The stability of the keyhole decreases for deep penetrated high-power laser beam welding. The keyhole tends to collapse with increasing laser power and e.g. keyhole induced porosity can occur. This study deals with the observation of the keyhole during high-power laser beam welding in partial penetration mode by means of a high-speed camera. A butt configuration of 25 mm thick structural steel and transparent quartz glass was used for the experiments. An oscillating magnetic field was applied perpendicular to the welding direction on the root side of the steel plate. The keyhole was highlighted with a coaxial diode laser. It was ascertained that the stability of the keyhole and the weld penetration depth were increased by applying an oscillating magnetic field with an oscillating frequency of 1.2 kHz and a magnetic flux density of 50 mT. PB - Elsevier Ltd. KW - Magnetic field KW - Laser beam welding KW - Keyhole stability PY - 2021 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/52007 AN - OPUS4-52007 SN - 0030-3992 VL - 135 SP - 106715 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany