TY - JOUR A1 - Avilov, Vjaceslav A1 - Schneider, André A1 - Lammers, Marco A1 - Gumenyuk, Andrey A1 - Rethmeier, Michael T1 - Electromagnetic control of the weld pool dynamics in partial penetration laser beam welding of aluminium alloys T2 - Journal of iron and steel research international N2 - The main characteristic feature of deep penetration laser beam welding is a large temperature difference between the plasma cavity (keyhole) in the centre of the weld pool and the melting/solidification front. Large temperature gradients in the weld pool result in a very intensive thermocapillary (Marangoni) convection. The weld pool surface width becomes very large and unstable. However, an externally applied oscillating magnetic field can stabilize the surface of the melt (the Garnier-Moreau effect, 1983). In the present work this technology was used to stabilize the surface of the weld pool in partial penetration 4.4 kW Nd:YAG laser beam welding of AW-5754 alloyin PA position. The AC magnet was mounted on the laser welding head. The oscillating magnet field was oriented perpendicular to the welding direction. It was found that the AC magnet field can drastically reduce the surface roughness of welds. The analysis of the x-ray images shows a rastic reduction of porosity content in the welds. This effect can be explained as a result of electromagnetic ectification of the melt. PB - Ed. Board CY - Beijing KW - Electromagnetically controlled laser beam welding KW - Weld pool stabilization KW - Porosity prevention PY - 2012 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/26833 AN - OPUS4-26833 SN - 1006-706X SN - 1001-0963 VL - 19 IS - Suppl. 1 SP - 233 EP - 236 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany