TY - CONF A1 - Pittner, Andreas T1 - Simulation of Welding Temperature Field in Laser Beam Welding by Inverse Techniques T2 - 13th NOLAMP, Conference on Laser Materials Processing in the Nordic Countries CY - Trondheim, Norway DA - 2011-06-27 PY - 2011 AN - OPUS4-24162 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Pittner, Andreas T1 - Potenzial der Schweißsimulation bei fügetechnischen Fragestellungen T2 - Treffen des DVS Beziksverband Berlin, BAM CY - Berlin, Germany DA - 2012-10-31 PY - 2012 AN - OPUS4-28678 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Su, H. A1 - Wu, Chuan Song A1 - Pittner, Andreas A1 - Rethmeier, Michael T1 - Simultaneous measurement of tool torque, traverse force and axial force in friction stir welding N2 - Simultaneous measurement of the tool torque, traverse force and axial force during friction stir welding process is of great significance to the understanding of the underlying process mechanism and the optimizing of the process parameters. Different from the traditional measurement methods using load cell or rotating component dynamometer, an indirect but economical methodology is used in this study for the simultaneous measurement of the traverse force, axial force and tool torque by monitoring the output torques of the servo motors and main spindle three-phase AC induction motor inside the FSW machine. The values of the traverse force, axial force and tool torque are determined under different welding conditions, and the influencing factors are examined. The measured results in friction stir welding of AA2024-T4 aluminum alloys at different combinations of tool rotation speed and welding speed lay foundation for process optimization. KW - Friction stir welding KW - Measurement KW - Traverse force KW - Axial force KW - Tool torque PY - 2013 DO - https://doi.org/10.1016/j.jmapro.2013.09.001 SN - 0278-6125 SN - 1526-6125 VL - 15 IS - 4 SP - 495 EP - 500 PB - Elsevier Ltd. CY - Dearborn, Mich., USA AN - OPUS4-29688 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Schempp, Philipp A1 - Cross, C.E. A1 - Pittner, Andreas A1 - Rethmeier, Michael T1 - Solidification of GTA aluminium weld metal: Part 2 - Thermal conditions and model for columnar-to-equiaxed transition KW - Aluminium KW - Gas tungsten arc welding (GTAW) KW - Columnar to equiaxed transition (CET) KW - Thermal analysis PY - 2014 SN - 0043-2296 SN - 0096-7629 VL - 93 IS - March SP - 69-s - 77-s PB - American Welding Society CY - New York, NY AN - OPUS4-30415 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Schempp, Philipp A1 - Pittner, Andreas A1 - Rethmeier, Michael T1 - Grain structure in aluminium TIG welds N2 - The microstructure of a fusion weld has great influences on the susceptibility of the base material to hot cracking and on the mechanical properties of the weld. Small, globulitic grains are necessary for increased strength, ductility and toughness and for a low inclination to hot cracking instead of large, oblong grains. This study reports on the factors which exert the main influences on such grain refinement in the weld. Thus, the influences of the thermal conditions, the chemical composition of the weld metal and the number and type of solidification nuclei on the microstructure were classified for the TIG welding of three different aluminium alloys. PY - 2014 SN - 1612-3433 VL - 13 IS - 3 SP - 177 EP - 181 PB - DVS - German Welding Society CY - Düsseldorf AN - OPUS4-30806 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Pittner, Andreas T1 - GMA welding of AW-6082 using filler wires fostering grain refinement in the weld metal N2 - The application of welded aluminum constructions has increased over the last decades due to the high demand for lightweight design. In this context aluminum alloys have a significant importance especially the heat treatable Al-Mg-Si alloys. With regards to welding the heat input causes the dissolving of the precipitates yielding a degradation of the strength properties. Furthermore, there is the risk of solidification cracking during welding for Al-Mg-Si alloys, especially AW 6082-T6. As a consequence Al-Mg-Si alloys are welded using a dissimilar filler material based on 5xxxx aluminum alloys that yields a reduction of resulting strength properties in comparison to the base material. Therefore, the paper presents the application of a novel massive filler wire for Al-Mg-Si alloys. The wire consists of AW 6082 with additionally added AlTi5B1 master alloy fostering the grain refinement of the weld metal. Exemplarily for the base material AW 6082-T6 GMA welding experiments are performed using the novel filler wire 6082TiB. It could be shown that solidification cracks could totally be avoided. The tensile strength of the welded joints are evaluated and compared with weldments using a conventional 5183 filler wire. Artificial aging is performed after welding in order to improve the strength properties by solution hardening showing the potential of these alloys. T2 - 10th International Conference Trends in Welding Research CY - Tokyo, Japan DA - 11.10.2016 KW - Filler wires KW - MIG welding KW - Aluminium 6082 KW - Precipitation hardening KW - Mechanical properties PY - 2016 AN - OPUS4-38290 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Pittner, Andreas T1 - Schweißeignungsuntersuchungen an hochfesten Feinkornbaustählen beim Einsatz modifizierter Sprühlichtbogenprozesse N2 - Der Einsatz modifizierter Sprühlichtbogenprozesse zum Schweißen von hochfesten Feinkornbaustählen wird aufgezeigt. Besonderes Augenmerk wird den Entstehungsmechanismen aufgetretener Mirkorisse gewidment, welche als Heißrisse klassifiziert werden. T2 - 58. Sitzung der Arbeitsgruppe V.24 "Schutzgasschweißen mit abschmelzender Elektrode MIG/MAG" des AfT des DVS CY - München, Linde AG, Germany DA - 08.10.2014 KW - Modifizierte Sprühlichtbogenprozesse KW - Hochfeste Feinkornbaustähle KW - Heißrisse PY - 2014 AN - OPUS4-38296 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Pittner, Andreas T1 - Schweißeignungsuntersuchungen an hochfesten Feinkornbaustählen beim Einsatz modifizierter Sprühlichtbogenprozesse N2 - Die Ergebnisse umfangreicher Schweißeignungsuntersuchungen zum Einsatz modifizierter Sprühlichtbogenprozesse beim Schweißen hochfester Feinkornbaustähle werden aufgezeigt unter besonderer Berücksichtigung aufgetretener Mikrorisse. T2 - 2. Ilmenauer schweißtechnisches Symposium CY - TU Ilmenau, Germany DA - 13.10.2015 KW - MSG-Schweißen KW - Modifizierter Sprühlichtbogen KW - Hochfeste Feinkornbaustähle KW - Mikrorisse PY - 2015 AN - OPUS4-38295 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Pittner, Andreas T1 - Möglichkeiten der Schweißsimulation für dickwandige Strukturen zur Vorhersage von Verzug und Eigenspannungen N2 - Möglichkeiten der Schweißstruktursimulation zur Bewertung und Auslegung dickwandiger Komponenten werden aufgezeigt und anhand von Anwendungsbeispielen erörtert. T2 - Workshop des Fraunhofer IPK "Unterpulverschweißen dickwandiger Bauteile" CY - Berlin, Fraunhofer IPK, Germany DA - 12.05.2016 KW - Schweißstruktursimulation KW - Mehrlagenschweißen KW - Eigenspannungen KW - Verzug KW - Materialmodellierung PY - 2016 AN - OPUS4-38293 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Neubert, S. A1 - Pittner, Andreas A1 - Rethmeier, Michael T1 - Numerical Sensitivity Analysis of TRIP-Parameter K on Weld Residual Stresses and Weld Distortion N2 - A combined experimental numerical approach is applied for a sensitivity analysis of the transformation induced plasticity (TRIP)-parameter K on welding residual stresses and welding distortion for the welding of the low-alloyed high-strength S960QOL with the high-alloyed hig-strength filler material CN13-4-IG. A thermo-mechanical FE model of a real GMA welding process was experimentally validated against termperature field, X-Ray stress measurments and optical distortion measurement. Within the sensititvity analysis K was varied and the influence on the calculated welding residual stresses and welding distortion is evaluated by performing corresponding FEA. The correct order of K magnitude is necessary in order to reproduce the residual stresses qualitatively and quantitatively. For the sufficient reproducing of the welding distortion the transformation induced plasticity can be neglected. T2 - 11th International Seminar - Numerical Analysis of Weldability CY - Graz, Austria DA - 27.09.2015 KW - TRIP PY - 2016 SN - 978-3-85125-490-7 SN - 2410-0544 SP - 361 EP - 383 PB - Verlag der Technischen Universität Graz CY - Graz AN - OPUS4-38904 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -