TY - JOUR A1 - Bakir, Nasim A1 - Pavlov, V. A1 - Zavjalov, S. A1 - Volvenko, S. A1 - Gumenyuk, Andrey A1 - Rethmeier, Michael T1 - Development of a novel optical measurement technique to investigate the hot cracking susceptibility during laser beam welding T2 - Welding in the World N2 - Using a novel optical measurement technique together with the optical flow algorithm, a two-dimensional deformation analysis during welding was conducted. The presented technique is the first to provide a measurement of the full strain field locally in the immediate vicinity of the solidification front. Additionally, the described procedure of the optical measurement allows the real material-dependent values of critical strain and strain rate characterizing the transition to hot cracking during laser welding processes to be determined. Furthermore, the above-mentioned technique is independet on the welding process, which means, it can be also used for arc welding processes. Dependency between the external strain rate and the critical local strain and strain rate has been observed. That is to say, the critical local strain and strain rate is increased with an increase of the strain rate.Moreover, this technique allows automatic identification of the cases that can be critical for the solidification crack formation by monitoring the state of strain on the crack-sensitive region within the mushy zone. PB - Springer Berlin Heidelberg CY - Berlin KW - Optical measurment technique KW - Hot crack KW - Critical strain KW - Laser beam welding PY - 2019 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/47761 AN - OPUS4-47761 SN - 0043-2288 VL - 63 IS - 2 SP - 435 EP - 441 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany