TY - CHAP A1 - Brand, M. A1 - Michailov, Vesselin T1 - FE-Welding Simulation and Distorsion Measurement during Welding using optical Object Grating Method T2 - Mathematical modelling of weld phenomena 7, papers presented at the Seventh International Seminar 'Numerical Analysis of Weldability' held 2003 Schloss Seggau near Graz, Austria Y1 - 2005 SN - 3-901351-99-X SP - 763 EP - 778 PB - Techn. Univ. CY - Graz ER - TY - CHAP A1 - Michailov, Vesselin A1 - Staudtaus, M. A1 - Rethmeier, M. T1 - Numerical MIG-Welding Simulation of Magnesium Alloys T2 - Mathematical modelling of weld phenomena 7, papers presented at the Seventh International Seminar 'Numerical Analysis of Weldability' held 2003 at Schloss Seggau near Graz, Austria Y1 - 2005 SN - 3-901351-99-X SP - 77 EP - 89 PB - Techn. Univ. CY - Graz ER - TY - CHAP A1 - Stadtaus, Marc A1 - Dilger, Klaus A1 - Michailov, Vesselin T1 - Numerical Simulation of Tekken and Modified CTS-Test for the Prediction of Cold Cracking Susceptibility T2 - Mathematical modelling of weld phenomena 7, papers presented at the Seventh International Seminar 'Numerical Analysis of Weldability' held 2003 at Schloss Seggau near Graz, Austria Y1 - 2005 SN - 3-901351-99-X SP - 875 EP - 891 PB - Techn. Univ. CY - Graz ER - TY - CHAP A1 - Doynov, Nikolay A1 - Christov, St. A1 - Michailov, Vesselin T1 - Development of the Strains during Local Explosive Post Treatment of Welded Joints T2 - Mathematical modelling of weld phenomena 7, papers presented at the Seventh International Seminar 'Numerical Analysis of Weldability' held 2003 at Schloss Seggau near Graz, Austria Y1 - 2005 SN - 3-901351-99-X SP - 363 EP - 375 PB - Techn. Univ. CY - Graz ER - TY - JOUR A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin A1 - Wohlfahrt, Helmut T1 - Numerical simulation of welding stresses and distortions under consideration of temporal and local changes of strain rate Y1 - 2004 ER - TY - CHAP A1 - Doynov, Nikolay A1 - Ossenbrink, Ralf A1 - Kloshek, Alexander A1 - Michailov, Vesselin T1 - Simulation of the Welding Distortions in Large Welded Structures KW - Simulation KW - Welding Distortions KW - Distortions KW - Welded Structures KW - welding KW - schweißen KW - fügen KW - Simulation KW - Fügetechnik Y1 - 2007 UR - http://www.fabtechexpo.com ER - TY - CHAP A1 - Deflorio, Andrea A1 - Klingler, M. A1 - Brinkmann, D. A1 - Michailov, Vesselin ED - Cerjak, Horst-Hannes T1 - Laser Beam Welding Simulation with two Different Approaches T2 - Mathematical modelling of weld phenomena 8 KW - Laser Beam Welding KW - Simulation KW - Different Approaches KW - Laserstrahlschweißen KW - welding KW - schweißen KW - fügen KW - Fügetechnik Y1 - 2007 SN - 978-3-902465-69-6 PB - Verl. der Techn. Univ. Graz CY - Graz ER - TY - CHAP A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin ED - Cerjak, Horst-Hannes T1 - Thermomechanical Numerical Simulation with the Maximum Temperature Austenisation Cooling Time Model (STAAZ) T2 - Mathematical modelling of weld phenomena KW - thermomechanical numerical simulation KW - thermomechanical KW - simulation KW - welding KW - fügen KW - schweißen KW - Fügetechnik Y1 - 2007 SN - 978-3-902465-69-6 PB - Verl. der Techn. Univ. Graz CY - Graz ER - TY - CHAP A1 - Stadtaus, Marc A1 - Doynov, Nikolay A1 - Michailov, Vesselin ED - Cerjak, Horst-Hannes T1 - Investigation of the Modified CTS-Test for the Prediction of Cold Cracking Susceptibility by Numerical Models T2 - Mathematical modelling of weld phenomena 8 KW - CTS-Test KW - cold cracking susceptibility KW - numerical models KW - Kaltriss KW - numerische Modelle KW - welding KW - schweißen KW - fügen KW - Fügetechnik Y1 - 2007 SN - 978-3-902465-69-6 PB - Verl. der Techn. Univ. Graz CY - Graz ER - TY - CHAP A1 - Karkhin, Victor A. A1 - Levchenko, A. M. A1 - Homich, P. N. A1 - Michailov, Vesselin ED - Cerjak, Horst-Hannes T1 - Computer-Aided Determination of Diffusible Hydrogen in Deposited Weld Metal T2 - Mathematical Modelling of Weld Phenomena 8 KW - computer determination KW - determination KW - diffusible hydrogen KW - hydrogen KW - deposited weld metal KW - welding KW - fügen KW - schweißen KW - Fügetechnik Y1 - 2007 SN - 978-3-902465-69-6 SP - 785 EP - 798 PB - Verl. der Techn. Univ. Graz CY - Graz ER - TY - CHAP A1 - Karkhin, Victor A. A1 - Homich, P. N. A1 - Michailov, Vesselin ED - Cerjak, Horst-Hannes T1 - Models for Volume Heat Sources and Functional-Analytical Technique for Calculating the Temperature Fields in Butt Welding T2 - Mathematical modelling of weld phenomena 8 KW - functional-analytical technique KW - calculating temperature fields KW - temperature fields KW - butt welding KW - welding KW - schweißen KW - fügen KW - Fügetechnik Y1 - 2007 SN - 978-3-902465-69-6 PB - Verl. der Techn. Univ. Graz CY - Graz ER - TY - CHAP A1 - Doynov, Nikolay A1 - Ossenbrink, Ralf A1 - Schmidt, J. A1 - Michailov, Vesselin T1 - Utilization of Weld Pool Models in Thermal-Mechanical Simulations T2 - Mathematical modelling of weld phenomena 8 KW - weld pool models KW - model KW - thermal-mechanical simulation KW - simulation KW - welding KW - fügen KW - schweißen KW - Fügetechnik Y1 - 2007 SN - 978-3-902465-69-6 PB - Verl. der Techn. Univ. Graz CY - Graz ER - TY - CHAP A1 - Schwenk, C. A1 - Rethmeier, M. A1 - Dilger, Klaus A1 - Michailov, Vesselin ED - Cerjak, Horst-Hannes T1 - Sensitivity Analysis of Welding Simulation Depending on Material Properties Value Variation T2 - Mathematical modelling of weld phenomena 8 KW - sensitivity analysis KW - analysis KW - welding simulation KW - simulation KW - material properties value variation KW - welding KW - schweißen KW - fügen KW - Fügetechnik Y1 - 2007 SN - 978-3-902465-69-6 PB - Verl. der Techn. Univ. Graz CY - Graz ER - TY - CHAP A1 - Karkhin, Victor A. A1 - Homich, P. N. A1 - Michailov, Vesselin T1 - Analytical-Experimental Technique for Calculating the Temperature Fields in Laser Welding T2 - 11th Nolamp Conference in Laser Processing of Materials, August 20-22, 2007 Lappeenranta KW - analytical experimental technique KW - analytical KW - calculating temperature fields KW - temperature fields KW - laser welding KW - welding KW - Laserschweißen KW - Temperaturfelder KW - Berechnung Temperaturfelder KW - schweißen KW - fügen KW - Fügetechnik Y1 - 2007 SP - 21 EP - 27 ER - TY - CHAP A1 - Stapelfeld, Christoph A1 - Doynov, Nikolay A1 - Atanasova, D. A1 - Michailov, Vesselin T1 - Calculation of Welding Distortions in Large Structures Using the Maximum Temperature Model and the Coupled Analytic-Numerical Shrinkage Force Model T2 - ESI Global Forum 2010, 19. - 20. Mai 2010, München KW - welding KW - temperature model KW - model KW - analytic KW - numerical KW - shrinkage force model KW - schweißen KW - fügen KW - simulieren Y1 - 2010 ER - TY - GEN A1 - Michailov, Vesselin T1 - Advanced Analytical-Numerical Approach for Simulation of Welding Distortions T2 - Journal of Materials Science and Technology Y1 - 2007 SN - 0861-9786 VL - 15 IS - 3 SP - 139 EP - 150 ER - TY - GEN A1 - Michailov, Vesselin A1 - Doynov, Nikolay A1 - Stapelfeld, Christoph A1 - Ossenbrink, Ralf T1 - Hybrid Model for Prediction of Welding Distortions in Large Structures T2 - Journal of Frontiers of Materials Science Y1 - 2011 SN - 2095-025X VL - 5 IS - 2 SP - 209 EP - 215 ER - TY - GEN A1 - Fritzsche, Sebastian A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin T1 - Experimental characterisation of structured sheet metals T2 - Key Engineering Materials Y1 - 2011 SN - 1013-9826 SN - 1662-9795 VL - 473 SP - 404 EP - 411 ER - TY - CHAP A1 - Dreibati, Ossama A1 - Zhang, Wei A1 - Wolf, Matthias A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin T1 - Thermo-mechanical properties of refractory ceramic for the numerical simulation of their thermo-shock behaviour Y1 - 2011 ER - TY - CHAP A1 - Dreibati, Ossama A1 - Ossenbrink, Ralf A1 - Doynov, Nikolay A1 - Michailov, Vesselin T1 - Physical and numerical simulation of thermo-mechanical properties in the weld heat affected zone of an AlMgSi-alloy T2 - THERMEC 2011, International Conference on Processing & Manufacturing of Advanced Materials, processing, fabrication, properties, applications, August 1 - 5, 2011, Quebec City, Canada, Vol. 2 Y1 - 2011 SP - 1491 EP - 1496 PB - TTP, Trans Tech Publ. CY - Durnten-Zurich [u.a.] ER - TY - CHAP A1 - Dreibati, Ossama A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin T1 - Hydrogen charging of high strength steel specimens and physical simulation of cold cracking under laser beam welding conditions T2 - THERMEC 2011, International Conference on Processing & Manufacturing of Advanced Materials, processing, fabrication, properties, applications, August 1 - 5, 2011, Quebec City, Canada, Vol. 2 Y1 - 2012 SN - 978-3-0-3785-303-0 SP - 1391 EP - 1396 PB - TTP, Trans Tech Publ. CY - Durnten-Zurich [u.a.] ER - TY - CHAP A1 - Kornienko, Elena A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin T1 - Investigation of corrosion behaviour of structured sheet metals by salt spray test T2 - Proceedings of International Conference on Innovative Technologies, IN-TECH, 01.09.2011 to 03.09.2011, Bratislava, Slovakia Y1 - 2011 SP - 308 EP - 311 ER - TY - CHAP A1 - Sasse, Ina A1 - Schleuß, Leander A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin T1 - Cutting of structured sheet metals with high power fiber laser T2 - Proceedings of International Conference on Innovative Technologies, IN-TECH, 01.09.2011 to 03.09.2011, Bratislava, Slovakia Y1 - 2011 SP - 485 EP - 488 ER - TY - CHAP A1 - Malikov, Viatcheslav A1 - Ossenbrink, Ralf A1 - Viehweger, Bernd A1 - Michailov, Vesselin T1 - Flat hemming of structured sheet metals T2 - Proceedings of International Conference on Innovative Technologies, IN-TECH, 01.09.2011 to 03.09.2011, Bratislava, Slovakia KW - hemming KW - structured sheet metal KW - FE analysis Y1 - 2011 ER - TY - GEN A1 - Brandl, Erhard A1 - Palm, Frank A1 - Michailov, Vesselin A1 - Viehweger, Bernd A1 - Leyens, Christoph T1 - Mechanical properties of additive manufactured titanium (Ti-6Al-4V) blocks deposited by a solid-state laser and wire T2 - Materials and Design KW - Non-ferrous metals and alloys KW - Mechanical KW - Microstructure Y1 - 2011 SN - 0261-3069 VL - 32 IS - 10 SP - 4665 EP - 4675 ER - TY - GEN A1 - Brandl, Erhard A1 - Viehweger, Bernd A1 - Michailov, Vesselin A1 - Leyens, Christoph T1 - Deposition of Ti-6Al-4V using laser and wire, part I: Microstructural properties of single beads KW - Titanium KW - Ti-6Al-4V KW - Microstructure KW - Additive manufacturing KW - Laser KW - Deposition Y1 - 2011 ER - TY - GEN A1 - Malikov, Viatcheslav A1 - Ossenbrink, Ralf A1 - Viehweger, Bernd A1 - Michailov, Vesselin T1 - Experimental investigation and analytical calculation of the bending force for air bending of structured sheet metals T2 - Advanced Materials Research KW - air bending KW - structured sheet metal KW - bending force Y1 - 2012 SN - 1022-6680 VL - 418-420 SP - 1294 EP - 1300 ER - TY - GEN A1 - Kornienko, Elena A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin T1 - Corrosion properties of structured sheet metals in salt environment T2 - Engineering Review Y1 - 2011 SN - 1330-9587 VL - 31 IS - 2 SP - 97 EP - 104 ER - TY - GEN A1 - Bandl, Erhard A1 - Michailov, Vesselin A1 - Viehweger, Bernd A1 - Leyens, Christoph T1 - Deposition of Ti-6Al-4V using laser and wire, part II: Hardness and dimensions of single beads T2 - Surface & Coatings Technology Y1 - 2011 SN - 0257-8972 VL - 206 IS - 6 SP - 1130 EP - 1141 ER - TY - GEN A1 - Dreibati, Ossama A1 - Ossenbrink, Ralf A1 - Doynov, Nikolay A1 - Michailov, Vesselin T1 - Physical and numerical simulation of thermo-mechanical properties in the weld heat affected zone of an AlMgSi-alloy T2 - Materials Science Forum Y1 - 2012 SN - 0255-5476 VL - 706-709 SP - 1491 EP - 1496 ER - TY - CHAP A1 - Malikov, Viatcheslav A1 - Ossenbrink, Ralf A1 - Viehweger, Bernd A1 - Michailov, Vesselin T1 - FE-Simulation of deep drawing of structured sheet metals T2 - New technologies and achievements in metallurgy and materials engineering, XIII International Scientific conference, a collective monograph Y1 - 2012 SN - 978-83-87745-74-5 SP - 410 EP - 413 ER - TY - GEN A1 - Malikov, Viatcheslav A1 - Ossenbrink, Ralf A1 - Viehweger, Bernd A1 - Michailov, Vesselin T1 - Analytical and numerical calculation of the force and power requirements for air bending of structured sheet metals T2 - Key Engineering Materials KW - air bending, structured sheet metal, simulation Y1 - 2011 U6 - https://doi.org/10.4028/www.scientific.net/KEM.473.602 SN - 1013-9826 VL - Vol. 473 SP - 602 EP - 609 ER - TY - GEN A1 - Malikov, Viatcheslav A1 - Ossenbrink, Ralf A1 - Viehweger, Bernd A1 - Michailov, Vesselin T1 - Investigation of air bending of structured sheet metals by multistage FE simulation T2 - The International Journal of Advanced Manufacturing Technology Y1 - 2012 U6 - https://doi.org/10.1007/s00170-012-3927-4 SN - 1433-3015 VL - 63 IS - 5-8 SP - 449 EP - 455 ER - TY - GEN A1 - Genchev, Gancho Vladimirov A1 - Dreibati, Ossama A1 - Ossenbrink, Ralf A1 - Doynov, Nikolay A1 - Michailov, Vesselin T1 - Physical and Numerical Simulation of the Heat-affected Zone of Multi-pass Welds T2 - Materials Science Forum N2 - The paper presents a numerical and experimental approach for the quantification of the thermo-mechanical properties in multi-pass weld’s heat affected zone (HAZ) of low alloy steel “S355J2+N”. First, the characteristic temperature cycles for multi-pass welds were identified by FE temperature field simulations of welding. Based on the identified temperature cycles, the microstructure in the HAZ has been physically simulated with the simulation and testing system Gleeble 3500 to investigate the influence of multi thermal exposure on the thermo-mechanical properties. Thus, the thermo-mechanical material properties including thermal strain and temperature dependent stress strain behaviour as function of peak temperatures and cooling rates have been determined. These material properties were used to calibrate a developed model for numerical prediction of the material properties of multi-pass weld HAZ. KW - welding simulation KW - multi-pass welds KW - thermo-mechanical properties KW - physical simulation, Gleeble Y1 - 2013 UR - www.scientific.net/MSF.762.544 SN - 0255-5476 IS - Vol. 762 SP - 544 EP - 550 ER - TY - CHAP A1 - Sasse, Ina A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin T1 - Welding of structured sheet metals with high power fiber laser T2 - Międzynarodowa Sesja Studencka, 30. Mai 2012, Częstochowa/Polen KW - structured sheet metals; laser welding Y1 - 2012 SN - 978-83-87745-69-1 SP - 285 EP - 290 CY - Częstochowa ER - TY - CHAP A1 - Genchev, Gancho Vladimirov A1 - Ossenbrink, Ralf A1 - Doynov, Nikolay A1 - Michailov, Vesselin T1 - Material Properties of the HAZ of Multi-Pass Welded Joints from low alloyed Steel T2 - Junior Euromat 2012, Paperlist KW - material properties of the heat affected zone; multi-pass welds Y1 - 2012 UR - http://wiki.dgm.de/wwiki/wiki/Junior-Euromat%202012%20-%20Paperlist SP - A297 ER - TY - GEN A1 - Zhang, Wei A1 - Doynov, Nikolay A1 - Wolf, Matthias A1 - Dreibati, Ossama A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin T1 - Investigation of the Thermal Shock Behavior of Ceramic Using a Combination of Experimental Testing and FE-Simulation Methods T2 - Advanced engineering materials N2 - Thermal shock behavior of ceramics plays a decisive role in their broad industrial applications. For enhanced understanding of damage and failure mechanism under thermal shock loading, in the present work, a combination of experimental testing and numerical simulation methods has been used. The thermal shock behavior of the alumina (99.7%) disk samples has been investigated by using a plasma test stand: the bottom of the ceramic disks were locally heated in the center by plasma beam; during the heat treatment the temperature distribution at the top of the sample was recorded with a thermographic system. To characterize the thermal shock resistance, a thermomechanical simulation was subsequently carried out. It calculates the temperature and stress distribution within the ceramic disks. The calculated critical thermal tension stresses are reported, which led to the failure of the ceramic disks under thermal shock loading. The effect of the sample thickness on the temperature and stress distribution is presented. Compared with the experimental results the simulated results show excellent agreement. As conclusion, it is possible to determine the thermal shock behavior of ceramic materials by the combination of experimental testing and numerical simulation. KW - Thermal Shock Behavior KW - Ceramic KW - FE-Simulation KW - Experimental Testing Y1 - 2013 UR - http://www.aem-journal.com U6 - https://doi.org/10.1002/adem.201200241 SN - 1527-2648 VL - 15 IS - 6 SP - 480 EP - 484 ER - TY - CHAP A1 - Doynov, Nikolay A1 - Christov, St. A1 - Michailov, Vesselin A1 - Wohlfahrt, Helmut T1 - Finite Elements Simulation of Multipass Submerged Arc Welding T2 - Mathematical Modelling of Weld Phenomena 6 KW - Multipass Submerged Arc Welding KW - Finite Elements Simulation Y1 - 2002 SN - 978-1-902653-56-3 SP - 651 EP - 669 PB - Maney – IOM CY - London ER - TY - CHAP A1 - Stadtaus, Marc A1 - Michailov, Vesselin A1 - Wohlfahrt, Helmut T1 - Simulation of Weld Shape, Microstructure, Distortion and Residual Stresses for Laser Beam Welding T2 - Mathematical Modelling of Weld Phenomena 6 KW - Laser Beam Welding KW - Simulation of Weld Shape KW - Microstructure KW - Distortion and Residual Stresses Y1 - 2002 SN - 978-1-902653-56-3 SP - 419 EP - 442 PB - Maney – IOM CY - London ER - TY - CHAP A1 - Rethmeier, M. A1 - Stadtaus, Marc A1 - Michailov, Vesselin A1 - Wohlfahrt, Helmut T1 - Numerical Calculation of Temperature Load and Distortion during Welding of Circumferential Weld Seams T2 - Mathematical Modelling of Weld Phenomena 6 KW - Numerical calculation of temperature load and distortion KW - Circumferential weld seams Y1 - 2002 SN - 978-1-902653-56-3 SP - 685 EP - 702 PB - Maney – IOM CY - London ER - TY - CHAP A1 - Karkhin, Victor A. A1 - Levchenko, A. M. A1 - Homich, P. N. A1 - Michailov, Vesselin T1 - Computer-Aided Express Determination of Diffusible Hydrogen in Deposited Weld Metal T2 - International Conference on Total Welding Management in Industrial Applications, 3rd JOIN Conference, Lappeenranta, August 21 - 24, 2007 KW - diffusible Hydrogen KW - deposited weld metal Y1 - 2007 SN - 978-952-214-413-3 SP - 252 EP - 262 CY - Lappeenranta ER - TY - GEN A1 - Stadtaus, Marc A1 - Michailov, Vesselin A1 - Wohlfahrt, Helmut T1 - Numerical calculation of the main factors on cold cracking T2 - Materialwissenschaften und Werkstofftechnik KW - cold cracks; finite‐element‐analysis; Kaltrisse Y1 - 2003 U6 - https://doi.org/10.1002/mawe.200390007 SN - 0933-5137 SN - 1521-4052 VL - 34 IS - 1 SP - 145 EP - 151 ER - TY - GEN A1 - Kornienko, Elena A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin T1 - Corrosion resistance of zinc-coated structured sheet metals T2 - Corrosion Science N2 - The purpose of this study is to characterise the corrosion behaviour of zinc-coated sheet metals after a structuring process using the salt spray test. The investigated structured material is manufactured by hydroforming and has a periodic hexagonal geometry. The corrosion behaviour has been evaluated by estimating the development of the corrosion area and penetration depth. The results of the investigation show that the corrosion area is larger on the smooth sheet than on the structured sheet. The difference between the structured and smooth sheets is negligible with increasing exposure time. Furthermore, the reasons for the different corrosion behaviours are discussed. KW - Corrosion KW - structur sheet metals Y1 - 2013 UR - http://www.sciencedirect.com/science/article/pii/S0010938X12006233 SN - 0010-938X VL - Vol. 69 SP - 270 EP - 280 ER - TY - CHAP A1 - Ossenbrink, Ralf A1 - Doynov, Nikolay A1 - Michailov, Vesselin T1 - Welding simulation of aluminium to steel joints by means of arc welding Processes T2 - 10th International Scientific and Technical Conference, Advanced metal materials and technologies (AMMT’2013), June 25–29, Saint Petersburg, 2013 N2 - The object of the present work is the introduction of a welding simulation approach for aluminium to steel welded joints which are realised by short-arc welding. The study is carried out with special emphasis on the simulation of temperature field by means of conduction solution, on the applicability of different metallurgical models as well as the aspects of the mechanical simulation of the residual welding stresses and distortions. As result an approved heat source model is suggested and the calibration parameters are presented. For the modelling of the microstructure and corresponding thermomechanical material properties in the heat affected zone different material models are validated. They are used to simulate the welding residual stresses and distortions. Furthermore, the welding simulation of a real component as well as a simulation study of different welding scenarios is presented. KW - Welding simulation; aluminium steel; welding Processes Y1 - 2013 SP - 523 EP - 528 PB - Izdat. Polytechn. Univ. CY - Saint Petersburg, Russia ER - TY - GEN A1 - Sasse, Ina A1 - Schleuß, Leander A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin T1 - Joining of structured sheet metals - Remote laser beam welding in comparison with resistance spot welding T2 - Welding and Cutting N2 - One main problem of thin-walled, large-area sheet components for lightweight construction solutions is the inadequate stiffness. One approach for a solution is provided by structured sheet metals which have an increased flexural stiffness due to three-dimensionally incorporated structures. The areas of application of the structured sheet metals (e.g. in subassemblies in automobile, rail vehicle and tank construction) necessitate adapted welding technologies. Since few systematic investigations have been conducted on structured sheet metals in the field of joining technology until now, there is a lack of knowledge about the further processing of these sheets by means of welding technology. The aims of the presented investigations are to make it possible to utilise these modern semi-finished products industrially using remote laser beam welding and to compare this with resistance spot welding. Both are important joining processes in the areas of applications interesting for structured sheet metals and thus constitute key technologies for industrial utilisation. Resistance spot welding has already been qualified for utilisation on structured sheet metals [1]. In addition, investigations were conducted into the remote laser beam welding of structured and flat sheets. These investigations encompass the possibilities of joining structured and flat joining members by means of remote laser beam welding as well as the assessment of the joint strength in tensile shear and peel tests. Thereafter, the results of the investigations are compared with the resistance spot welding of structured sheet metals and specific application recommendations are derived. KW - structured metals sheet KW - Remote laser beam welding KW - resistance spot welding Y1 - 2014 VL - 13 IS - 1 SP - 43 EP - 47 ER - TY - GEN A1 - Dreibati, Ossama A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin T1 - Quantification of cold cracking parameters of high strength steels by physical simulation under welding conditions T2 - Quarterly journal of the Japan Welding Society N2 - Cold cracks in welds are the result of the formation of brittle microstructure as martensite in the presence of diffusible hydrogen as well as of tensile stresses. Cold cracks occur when the combination of cold crack influence parameters (CCIP) overcomes a critical limit. In this study, critical combinations of CCIP were identified with an enhanced test procedure under welding conditions. The test is based on the physical simulation technique of heat affected zone (HAZ) and it is carried out using the test and simulation center Gleeble 3500. Thereby, laboratory special specimens are charged with hydrogen from pure hydrogen atmosphere in the initial stage of the test. Rigidly restraint specimen section is subjected to different weld temperature cycles. Through the thermal exposure, the desired microstructure of HAZ is set in the test zone of the restraint specimen section. A plastic deformation takes place owing to the prevented expansion during heating and contraction of the specimen during cooling. Consequently, compressive or tensile reactions stresses arise in the deformed zone. Cracked specimen represents a critical combination of the CCIP. The quantitative cold crack criterion separates the cold crack susceptible combinations from those non susceptible. KW - Cold Cracking KW - Physical Simulation KW - High Strength Steel Y1 - 2013 U6 - https://doi.org/10.2207/qjjws.31.148s SN - 0288-4771 VL - 31 IS - 4 SP - 148 EP - 152 ER - TY - GEN A1 - Kazak, Fedor A1 - Schleuß, Leander A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin A1 - Weiß, Sabine T1 - Particularities of testing structured sheet metals in 3-point bending tests T2 - Materials Testing N2 - Thin sheet metals from deep drawing steel DC04 are very often used in the production of car body and case parts. Quality improvement of sheet metal components by new constructive solutions (structuring) as well as adapted joining technology is going on. Structured sheet metals differ from each other by their high bending stiffness. At the same time, they show certain anisotropy due to the structure. Therefore a typical testing method of structured semi-finished parts (single sheet metals, sandwiches)is the bending test. The literature review revealed that in many studies no special demands on tests of structured materials were made. This concerns particularly the structure arrangement, structure direction and structure location of the specimen relative to the mandrel position during bending tests, i. e., the direction of the fixed load relative to the structure. The aim of this study was to determine the influence of the test specification on flexural behavior. In the present paper, honeycomb-structured sheet metals were examined using 3-point bending tests. Bending stiffness and lightweight potential were calculated with respect to the location of load application and compared for different structure arrangements,directions and locations. The influence of the anisotropy on flexural behavior of the honeycomb-patterned sheet metals was moderate. Y1 - 2016 U6 - https://doi.org/10.3139/120.110883 SN - 0025-5300 SN - 2195-8572 VL - 58 IS - 6 SP - 495 EP - 500 ER - TY - GEN A1 - Jakobsen, Daniel A1 - Zhang, Wei A1 - Doynov, Nikolay A1 - Böhm, Anna A1 - Malzbender, Jürgen A1 - Michailov, Vesselin A1 - Roosen, Andreas T1 - Thermal shock behaviour of laminated multilayer refractories for steel casting applications reinforced by residual stresses T2 - Ceramics International Y1 - 2016 U6 - https://doi.org/10.1016/j.ceramint.2016.05.149 SN - 0272-8842 VL - 42 IS - 12 SP - 13562 EP - 13571 ER - TY - GEN A1 - Zhang, Wei A1 - Doynov, Nikolay A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin T1 - Physical and FE-Simulation of Thermal Shock Behaviour of Refractory Ceramics T2 - refractories WORLDFORUM Y1 - 2016 SN - 1868-2405 VL - 8 IS - 2 SP - 110 EP - 117 ER - TY - CHAP A1 - Zhang, Wei A1 - Priefer, Marian A1 - Olenina, Mariia A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin T1 - Additive manufacturing by laser beam build-up welding T2 - 6th International Conference on Additive Technologies - iCAT 2016, Nürnberg, Germany, 29. - 30. November 2016 Y1 - 2016 SN - 978-961-285-537-6 SP - 324 EP - 327 ER -