TY - CONF A1 - Schempp, Philipp A1 - Pittner, Andreas A1 - Rethmeier, Michael A1 - Tang, Z. A1 - Seefeld, T. A1 - Cross, C.E. A2 - Babu, S. S. A2 - Bhadeshia, H.K. A2 - Cross, C.E. A2 - David, S.A. A2 - DebRoy, T. A2 - DuPont, J.N. A2 - Koseki, T. A2 - Liu, S. T1 - Influence of alloy and solidification parameters on grain refinement in aluminium weld metal due to inoculation T2 - Trends in welding research - Proceedings of the 9th international conference N2 - Refinement of the weld metal grain structure can improve the mechanical properties of the weld and decrease the susceptibility to solidification cracking of the weld metal. In this study, commercial Al Ti5B1 grain refiner was used to refine the microstructure of LB (laser beam) and GTA (gas tungsten arc) aluminum welds by inoculation. The grain refiner additions led to a significant decrease in the weld metal mean grain size whereby a transition from columnar to equiaxed grain structure (Columnar to Equiaxed Transition, CET) was observed. The development of both grain size and shape depended upon the base metal (Al alloys 1050A, 5083 and 6082) and upon the welding process. The GTA welding process allowed a more pronounced and a more efficient refinement than in LB welds. Furthermore, the influence of the solidification conditions on the CET was investigated through temperature measurements in the weld metal. The temperature profiles revealed a faster solidification of LB welds than in GTA welds. The results from the temperature measurements were also used to estimate (according to an existing model) the critical thermal gradient at which the CET occurs. PB - ASM international T2 - 9th International conference on trends in welding research CY - Chicago, Illinois, USA DA - 04.06.2012 KW - Aluminium KW - LBW KW - GTAW KW - Grain refinement KW - Alloy 1050A KW - Alloy 5083 KW - Alloy 6082 KW - Al Ti5B1 PY - 2013 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/27907 AN - OPUS4-27907 SN - 978-1-62708-998-2 SP - 98 EP - 107 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany