TY - JOUR A1 - Weber, Gert T1 - Zeitpunktbezogene Beschreibung der elektrischen Zusammenhänge im Sekundärkreis von Widerstandsschweißeinrichtungen KW - Punktschweissen KW - Widerstandsschweißeinrichtung KW - Schweißstrom PY - 1996 SN - 0036-7184 VL - 48 IS - 1 SP - 21 EP - 26 PB - Verl. für Schweißen u. Verwandte Verfahren, DVS-Verl. CY - Düsseldorf AN - OPUS4-658 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - RPRT A1 - Xu, Ping A1 - Weber, Gert A1 - Krause, Hans-Joachim A1 - Böllinghaus, Thomas T1 - Bewertung und Vereinheitlichung von gefügten Dünnblechproben für Schwingversuche im Zeitfestigkeitsbereich PY - 2002 SN - 0933-050X IS - 169 SP - 1 EP - 77 PB - Verband der Automobilindustrie CY - Frankfurt a. M. AN - OPUS4-1758 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Weber, Gert A1 - Xu, Ping T1 - Unification of Specimens and Test Procedures for Fatigue Testing of Joined Thin Sheet Metal Structures T2 - 55th International Conference Advanced Processes and Technologies in Welding and Allied Processes CY - Copenhagen, Denmark DA - 2002-06-24 PY - 2002 SN - 0043-2288 SN - 1878-6669 VL - 46 IS - III-1206-02 PB - Springer CY - Oxford AN - OPUS4-1445 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Weber, Gert T1 - Weldability Lobes in Resistance Spot Welding T2 - 55th International Conference Advanced Processes and Technologies in Welding and Allied Processes CY - Copenhagen, Denmark DA - 2002-06-24 PY - 2002 SN - 0043-2288 SN - 1878-6669 VL - 46 IS - III-1207-02 PB - Springer CY - Oxford AN - OPUS4-1446 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Weber, Gert T1 - Fuzzy-Klassifikation beim Punktschweißen T2 - MessComp '95 CY - Wiesbaden, Deutschland DA - 1995-09-05 KW - Punktschweissen KW - Qualitätssicherung KW - Fuzzy-Klassifikation PY - 1995 SN - 3-924651-48-5 SP - 48 EP - 50 PB - Network CY - Hagenburg AN - OPUS4-588 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert A1 - Burmeister, J. T1 - Online Process Monitoring by Fuzzy Classification during AC Resistance Welding T2 - International Conference at the 53rd Annual Assembly of the International Institute of Welding CY - Florence, Italy DA - 2000-07-13 KW - Online Process Monitoring PY - 2000 SP - 1 EP - 12 AN - OPUS4-763 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Xu, Ping A1 - Krause, Hans-Joachim A1 - Weber, Gert T1 - Vereinheitlichung von gefügten Dünnblechproben für Schwingversuche im Zeitfestigkeitsbereich PY - 2001 SN - 3-87155-671-8 N1 - Serientitel: DVS-Berichte – Series title: DVS-Berichte IS - 213 SP - 59 EP - 68 PB - DVS-Verl. CY - Düsseldorf AN - OPUS4-1119 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Xu, Ping A1 - Weber, Gert A1 - Böllinghaus, Thomas A1 - Krause, Hans-Joachim ED - Blom, A. F. T1 - Determination of relevant fatigue characteristics for joined thin sheet metal structures on suitable specimens with appropriate test methods T2 - 8th FATIGUE 2002 ; 8th International Fatigue Congress CY - Stockholm, Sweden DA - 2002-06-03 PY - 2002 SN - 1-901537-30-7 VL - 2 SP - 1103 EP - 1110 PB - EMAS, Engineering Materials Advisory Services CY - Cradley Heath, West Midlands AN - OPUS4-1385 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Weber, Gert A1 - Göklü, S. T1 - Resistance Spot Welding of Uncoated and Zinc Coated Advanced High-Strength Steels (AHSS) Weldability and Process Reliability-Influence of Welding Parameters KW - Resistance Spot Welding KW - Advanced High-Strength Steels (AHSS) PY - 2006 SN - 0043-2288 SN - 1878-6669 VL - 50 IS - 3/4 (IIW-1722-05 (ex-doc. III-1347-05)) PB - Springer CY - Oxford AN - OPUS4-11079 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert T1 - Resistance Spot Welding of High-Strength Multi-Phase Steels T2 - Seminar on Advances in Resistance Welding CY - Berlin, Germany DA - 2004-11-17 PY - 2004 AN - OPUS4-7597 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert A1 - Göklü, Sinasi T1 - Schweißeignung beim Widerstandspunktschweißen hoch fester Mehrphasenstähle (AHSS) für den Rohkarosserie-Leichtbau T2 - SWAC Innovationsdays 2005, Fa. S.W.A.C. GmbH, Safeweld Center CY - Taufkirchen, Germany DA - 2005-09-29 PY - 2005 AN - OPUS4-11160 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert A1 - Rethmeier, Michael T1 - Spot welding and weldbonding of high strength steels for lightweight auto body manufacturing T2 - EUROJOIN 8 - 8th European conference CY - Pula, Croatia DA - 2012-05-24 KW - Spot welding KW - Weldbonding KW - High strength steels KW - Process reliability KW - Mechanical properties of joints PY - 2012 SP - 633 EP - 643 AN - OPUS4-26383 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert A1 - Rethmeier, Michael T1 - Spot Welding and Weldbonding of High Strength for Leightweight Auto Body Manufacturing T2 - EUROJOIN 8 CY - Pula, Croatia DA - 2012-05-24 PY - 2012 AN - OPUS4-26366 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Weber, Gert A1 - Thommes, H. A1 - Gaul, H. A1 - Hahn, O. A1 - Rethmeier, Michael T1 - Mechanical properties of weldbonded joints of advanced high strength steels N2 - In lightweight car body shell mass production, due to requirements on vehicle weight reduction and carbon dioxide emissions, joining of advanced high strength steels (AHSS) with different joining procedures and especially hybrid bonding techniques is becoming more and more important. One of these hybrid bonding techniques is the combination of resistance spot welding and adhesive bonding called weldbonding. One of the important advantages of weldbonded joints in comparison to resistance spot welded joints are the enhanced mechanical properties. To guarantee sufficiently high quality conditions regarding the strength of the weldbonded joints, the influences of the applied adhesive systems and of different base metal combinations are studied. This is carried out for both non-corrosive and corrosive environments and for the choice of different joining parameters settings. In particular, the mechanical behaviour of the weldbonded joints is investigated under quasi-static, impact and fatigue loads. Furthermore, the energy absorption of the weldbonded joints for both non-corrosive and corrosive environments is studied. It is shown that the weldbonded joints possess higher mechanical strengths in all load cases (quasi-static, impact and fatigue). Corrosive attack affects weldbonded joints, and the quasi-static strength is reduced. Resistance spot welded joints are not affected by the corrosive attack, but even after several weeks of corrosive attack, the quasi-static strength of weldbonded joints remains higher than that of resistance spot welded joints. KW - Weldbonded joints KW - Corrosion KW - Mechanical strength KW - Fracture behaviour KW - Fatigue KW - Crash behaviour PY - 2011 U6 - https://doi.org/10.1163/016942411X580090 SN - 0169-4243 SN - 1568-5616 VL - 25 IS - 18 SP - 2369 EP - 2389 PB - VNU Science Press CY - Utrecht AN - OPUS4-24513 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Ullner, Christian A1 - Brauser, Stephan A1 - Subaric-Leitis, Andreas A1 - Weber, Gert A1 - Rethmeier, Michael T1 - Determination of local stress-strain properties of resistance spot-welded joints of advanced high-strength steels using the instrumented indentation test N2 - For spot-welded joints, the resistance to mechanical stress depends on the local strength properties and gradients in the weld area. The commonly used methods for investigating the stress–strain behaviour across the weld area are connected with a high level of sample preparation and with considerable limitations in local resolution. A promising method for determining locally resolved stress–strain curves is the instrumented indentation test in connection with the method of representative stress and strain (RS) and the method of artificial neural networks (NNs). The stress–strain properties of the weld nugget and the base metal determined by these two methods are compared and discussed, additionally in relation to the stress–strain curves obtained from the tensile test. The measured Vickers hardness across the weld area is compared with the evaluated local stress–strain properties. Three steels used in automobile manufacturing are investigated: mild steel DC04 and two advanced high-strength steels (TRIP steel HCT690T and martensitic steel HDT 1200M). The results of the two methods (RS and NN) show good correspondence for the base metal area but some significant differences for the weld nugget. Comparing the data across the weld area, no evidence of the presence of residual stress (which would influence the results) was found. KW - Ortsaufgelöst KW - Lokale Spannungs-Dehnungskurven KW - Punktschweißverbindung KW - Instrumentierte Eindringprüfung PY - 2012 U6 - https://doi.org/10.1007/s10853-011-5936-3 SN - 0022-2461 SN - 1573-4803 VL - 47 IS - 3 SP - 1504 EP - 1513 PB - Springer Science + Business Media B.V. CY - Norwell, Mass. AN - OPUS4-25276 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert A1 - Brauser, Stephan A1 - Gaul, Holger A1 - Rethmeier, Michael T1 - Study of Fatigue Behaviour for Spot Welded Tensile Shear Specimens of Advanced High Strength Steels T2 - EUROMAT 2011 European Congress on Advanced Materials and Processes CY - Montpellier, France DA - 2011-09-12 PY - 2011 AN - OPUS4-24390 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Gaul, Holger A1 - Brauser, Stephan A1 - Weber, Gert A1 - Rethmeier, Michael T1 - Methods to obtain weld discontinuities in spot-welded joints made of advanced high-strength steels N2 - Resistance spot welding is the major joining technique in mass car production. This applies in particular to high-strength steel and advanced high-strength steel (AHSS) joining of thin sheet steel components for lightweight body shell structures. Joining of AHSS in mass production might lead to weld discontinuities under certain circumstances. Those discontinuities in form of cracks might be an initial start of cracking in the spot-welded joints regarding fatigue loads. It is of great interest to figure out, if, in comparison to specimens without weld discontinuities, the crack initiating point changes and if the fatigue resistance might be reduced by the discontinuities. In this contribution, an overview of potential discontinuities is given. Their possible causes are discussed and means for their detection are highlighted. Among the possible causes of weld discontinuities, two major groups are distinguished: the welding parameters as primary influences in the welding process, and the production-specific influences as secondary ones. With emphasis on major cracks penetrating the weld nugget, these influences are analysed. Finally, a combination of extreme welding parameters with production-specific influences is chosen in order to establish a method which enables the preparation of fatigue test specimens with reproducible major cracks in different locations of the spot-welded joints. This method is than applied in order to prepare spot weld specimens for fatigue tests. KW - Cracking KW - Defects KW - Fatigue loading KW - High strength steels KW - Resistance spot welding PY - 2011 SN - 0043-2288 SN - 1878-6669 VL - 55 IS - 11/12 SP - 99 EP - 106 PB - Springer CY - Oxford AN - OPUS4-25026 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Weber, Gert A1 - Brauser, Stephan A1 - Gaul, Holger A1 - Rethmeier, Michael T1 - Study of fatigue behavior for spot welded tensile shear specimens of advanced high strength steels N2 - For automotive body-in-white applications the influence of manufacture-related gaps between the steel sheets and also of manufacture-related surface cracks on the fatigue behavior of tensile shear specimens for spot welded TRIP steel was analyzed. It was shown that gaps between the steel sheets reduce the fatigue strength, whereas the fatigue behavior is neither influenced by cracks in the electrode indentation area nor in the heat effected zone. PY - 2012 U6 - https://doi.org/10.1002/srin.201100286 SN - 1611-3683 SN - 0177-4832 VL - 83 IS - 10 SP - 988 EP - 994 PB - Verl. Stahleisen CY - Düsseldorf AN - OPUS4-27632 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Brauser, Stephan A1 - Rethmeier, Michael A1 - Pepke, Lutz-Alexander A1 - Weber, Gert T1 - Influence of production-related gaps on strength properties and deformation behaviour of spot welded trip steel HCT690T N2 - In this study, the influence of production-related gaps on the shear tension strength and fatigue performance was investigated for resistance spot welded TRIP steel HCT690. Furthermore, the local strain distribution in shear tension test was calculated by the digital image correlation technique (DIC). The static shear tension strength was found to be almost independent of gaps up to 3 mm. The maximum local strain in the spot weld region however decreases depending on which sample side (deformed or undeformed) is considered. In addition, it has been ascertained that gaps of 3 mm lead to a significant drop in fatigue life compared to gap-free shear tension samples. This fact could be attributed to decreased stiffness, higher transverse vibration and higher rotation (θ) between the sheets as well as increased local stress calculated by 2 dimensional FE simulation. KW - Deformation KW - Fatigue life KW - Finite element analysis KW - Gap KW - Resistance spot welding KW - Shear strength PY - 2012 SN - 0043-2288 SN - 1878-6669 VL - 56 IS - 03-04 SP - 115 EP - 125 PB - Springer CY - Oxford AN - OPUS4-27590 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - RPRT A1 - Rethmeier, Michael A1 - Weber, Gert A1 - Gaul, H. A1 - Brauser, Stephan T1 - Untersuchungen zur Ermüdungsfestigkeit von Widerstandspunktschweißverbindungen aus hochfesten Mehrphasenstählen unter Berücksichtigung fertigungsspezifischer Einflüsse N2 - Unter den rauen Bedingungen in der Automobilrohkarosseriefertigung lassen sich schweißbedingte Imperfektionen wie Risse beim Widerstandspunktschweißen von hochfesten Stählen nicht immer vermeiden. Für die sichere Auslegung ist die Kenntnis über den Einfluss solcher Risse von erheblicher Bedeutung. PY - 2011 SN - 978-3-942541-04-6 VL - P 802 SP - 1 EP - 86 PB - Verlag und Vertriebsgesellschaft mbH CY - Düsseldorf AN - OPUS4-25450 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert A1 - Göklü, S. T1 - Schweißeignung und Prozesssicherheit beim Widerstandspunktschweißen hoch fester Mehrphasenstähle im Rohkarosserie-Leichtbau T2 - EUROJOIN 5 ; 5th European Conference on Welding, Joining and Cutting CY - Wien, Österreich DA - 2004-05-13 KW - Hoch feste Mehrphasenstähle KW - Widerstandspunktschweißen PY - 2004 VL - 5 SP - V9-1-V9-30 CY - Wien AN - OPUS4-4721 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert A1 - Göklü, S. T1 - Resistance Spot Welding of High-Strength Multi-Phase Steels T2 - 3rd International Seminar on Advances in Resistance Welding CY - Berlin, Germany DA - 2004-11-17 KW - Resistance spot welding KW - Multi-phase steels KW - Advanced high-strength steels KW - AHSS PY - 2004 SP - 18 EP - 35 PB - SWANTEC Software and Engineering CY - Hoersholm, Denmark AN - OPUS4-4722 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert T1 - Resistance Spot Welding of High Strength Multi Phase Steels N2 - In the lightweight body shell mass production of automobiles the resistance welding process for joining high strengths multi phase steels is the most important joint procedure. For uncoated and hot dip zinc coated high strength TRIP steels, complex phase steels and martensite phase steels statements on process reliability in resistance spot welding based on two- and three-dimensional weldability lobes will be given. A comparison of weldability lobes of uncoated and hot dip zinc coated high strength steel sheets with reference sheets of mild steels will be carried out. This is realized with different electrode forces for short-, medium- and longtime welds. Especially the influence of the electrode force and welding time are studied separately in two-dimensional and commonly in threedimensional weldability lobes. A procedure for welding parameter optimisation in regard to maximal process reliability for the high strength multi phase steels is applied. Based on the electrode wear and the process reliability, statements on the weldability of high strength multi phase steels are formulated. Furthermore, results on the influence of the welding parameters on the hardness and the fatigue behaviour of the spot welded joints will be given. T2 - The 3rd International Seminar on Advances in Resistance Welding CY - Berlin, Germany DA - 2004-11-16 PY - 2004 AN - OPUS4-4727 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert T1 - Widerstandspunktschweißen hochfester Mehrphasenstähle für den Karosserie-Leichtbau: Schweißbereiche - Pro-zesssicherheit - Aufhärtung - Festigkeit N2 - Das Widerstandspunktschweißen ist das dominierende Fügeverfahren in der Massenfertigung von Automobil-Rohkarosserien aus Stahlfeinblechen. Dies gilt insbesondere für moderne hoch feste Mehrphasenstähle, die bei sehr hoher Festigkeit gleichzeitig ein gutes Umformvermögen aufweisen. Diese hoch festen Stahlwerkstoffe werden zur Gewichtsreduzierung und zur Verbrauchsminimierung bei gleichbleibender oder verbesserter Fahrgastzellensicherheit zunehmend im Rohkarosserie-Leichtbau eingesetzt. Mit dem Widerstandspunktschweißen liegt ein Verfahren vor, mit dem sich diese innovativen Werkstoffe prozesssicher und wirtschaftlich fügen lassen. Die neuentwickelten hoch festen Mehrphasenstähle sind - nach steigender Festigkeit geordnet - Dualphasenstähle (DP), Restaustenitstähle (RA) Komplexphasenstähle (CP) und Martensitphasenstähle (MS). Im vorliegenden Beitrag werden für unverzinkte und feuerverzinkte Varianten dieser Stähle Schweißbereiche für verschiedene Schweißparameter ermittelt und in Schweißbereichsdiagrammen dargestellt. Aus den dreidimensionalen Schweißbereichsdiagrammen werden für jeden der Stähle die optimalen Schweißparameter hinsichtlich einer hinreichend großen Prozesssicherheit abgeleitet. Für ausgewählte feuerverzinkte Stähle wird der Einfluss der Schweißparameter Elektrodenkraft und Schweißzeit auf die Qualitätsmerkmale Punktdurchmesser und Scherzugkraft untersucht. Darüber hinaus werden für alle Mehrphasenstähle exemplarische Härteverläufe über der Fügestelle dargestellt. T2 - 19. DVS-Sondertagung Widerstandsschweißen CY - Duisburg, Germany DA - 2004-05-26 PY - 2004 AN - OPUS4-4728 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert A1 - Göklü, S. T1 - Resistance Spot Welding of Advanced High Strength Steels - Influence of Welding Parameters and Electrode Cap Type T2 - International Conference of IIW CY - Prague, Czech Republic DA - 2005-07-14 KW - Resistance spot welding KW - Advanced high-strength steels (AHSS) PY - 2005 SP - 22 pages PB - IIW CY - Prag AN - OPUS4-10302 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert T1 - Influence of the Type of Electrode Caps on the Welding Current Ranges an the Process Reliability in Resistance Spot Welding T2 - Workshop SC Auto, Commission III CY - Graz, Austria DA - 2008-07-08 PY - 2008 AN - OPUS4-18499 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert T1 - Some Applications of a new Procedure to determine Process Reliability in Resistance Spot Welding T2 - Materials Science and Engineering CY - Nuremberg, Germany DA - 2008-09-01 PY - 2008 AN - OPUS4-18500 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert T1 - Resistance Spot Welding of Advance High Strength Steels (AHSS) T2 - Materials Science Engineering CY - Nuremberg, Germany DA - 2008-09-01 PY - 2008 AN - OPUS4-18501 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert T1 - Influence of Electrode Cap on the Process Reliability in Resistance Spot Welding of TRIP Steels T2 - Select Committe "Automotive and Road Transport 2008", Intermediate Meeting CY - Berlin, Germany DA - 2008-03-19 PY - 2008 AN - OPUS4-18502 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert A1 - Mellmann, Günter T1 - Zkušenosti o úcincích vnejších vlivù na prevnost v tlaku u predpjatých betonových mostù T2 - Die Lebensdauer von Tragkonstruktionen von Betonbauten und Großplattenhäusern CY - Brno, Czech Republic DA - 1975-10-13 PY - 1975 SP - 249 EP - 252 CY - Brno AN - OPUS4-16141 LA - ces AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert A1 - Göklü, Sinasi A1 - Tischlinger, Wolfgang A1 - Momeni, Kaveh A1 - Xu, Ping T1 - Widerstandspunktschweißen hoch fester Mehrphasenstähle für den Karosserie-Leichtbau: Schweißbereiche - Prozesssicherheit - Aufhärtung - Festigkeit T2 - Sondertagung Widerstandsschweißen "Treffpunkt Widerstandsschweißen" CY - Duisburg, Deutschland DA - 2004-05-26 KW - Widerstandspunktschweißen KW - Mehrphasenstähle KW - Leichtbau PY - 2004 SP - 113 EP - 137 PB - DVS-Verl. CY - Duisburg AN - OPUS4-4720 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert T1 - Weldability and Process Reliability in Resistance Spot Welding of High Strength Multi Phase Steels in Lightweight Body Shell Mass Production T2 - Eurojoin 5 Internationaler Kongress der EWF CY - Vienna, Austria DA - 2004-05-13 PY - 2004 AN - OPUS4-4941 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert A1 - Gaul, Holger A1 - Rethmeier, Michael T1 - Joining of Ultra High Strength Steels for Lightweight Body Shell Design in Automobile Manufacturing T2 - 50th International Deep Drawing Research Group Conference CY - Graz, Austria DA - 2010-05-31 PY - 2010 AN - OPUS4-22297 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Rethmeier, Michael A1 - Brauser, Stephan A1 - Weber, Gert T1 - Potential of optical strain field measurement for the characterisation of the properties of resistance-spot-welded joints N2 - For the designing of safety-relevant components particularly by means of finite element calculations, great significance is attached to the determination of local material parameters in the welding region. Conventional test methods can merely provide global parameters which, however, are frequently not sufficient precisely for the calculation of resistance-spot-welded components since these are characterised by the existence of joining zones with tight local limitations. In contrast, modern test methods such as optical strain field measurement permit the determination of the characteristic material data for concrete locations and times. In order to establish the potential of optical strain field measurements for the characterisation of the local material behaviour of spotwelded joints, tensile shear tests as well as tensile tests were carried out on resistance-spot-welded high-strength steels. The results show the high potential of this procedure not only for the quantification of the local strain behaviour in the joining region but also for the determination of local characteristic material data. PY - 2011 SN - 1612-3433 VL - 10 IS - 1 SP - 48 EP - 52 PB - DVS - German Welding Society CY - Düsseldorf AN - OPUS4-23220 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Weber, Gert A1 - Bschorr, T. A1 - Cramer, H. A1 - Hahn, Oliver A1 - Rethmeier, Michael A1 - Thommes, H. ED - da Silva, L.F.M. ED - Altenbach, H. T1 - Hybrid bonding of advanced high strength steels in the lightweight body shell design for the automobile manufacturing N2 - In the lightweight body shell mass production of automobiles, the application of hybrid bonding techniques becomes more and more important. Especially the combination of adhesive bonding and resistance spot welding called weldbonding is of great importance. The target of this contribution is to show the influence of medium-viscosity and low-viscosity structural adhesives on the process reliability of the weldbonding process and the mechanical properties of the hybrid bonded joints. The given results are based on the application of an epoxy PUR-based, an epoxy resin-based and a rubber-based adhesive system for joining a mild and some different advanced high strength steels (AHSS). It will be shown that both the process reliability of the weldbonding process and the mechanical behaviour of the weldbonded joints are influenced by the combinations of the base metals, the applied adhesive systems and the choice of the joining parameters. The behaviour of the weldbonded joints will be studied under quasi-static and impact loads. The discussion of the metallurgical structure of the weldbonded joints depending on the joining parameters will be given, too. Furthermore, the fatigue behaviour of the weldbonded joints will be studied. KW - Advanced high strength steels KW - Hybrid bonding KW - Lightweight body shell design KW - Weldbonding process reliability KW - Weldbonded joint behaviour PY - 2010 SN - 978-3-642-12666-6 U6 - https://doi.org/10.1007/978-3-642-12667-3_22 N1 - Serientitel: Advanced Structured Materials – Series title: Advanced Structured Materials VL - 3 SP - 343 EP - 372 PB - Springer AN - OPUS4-23150 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert A1 - Göklü, S. A1 - Pepke, Lutz-Alexander A1 - Rethmeier, Michael T1 - Einfluss von Schweißeinrichtungskomponenten auf die Prozesssicherheit beim Widerstandspunktschweißen hoch fester Stähle für den Rohkarosserie-Leichtbau T2 - join ex 2012 CY - Vienna, Austria DA - 2012-11-10 PY - 2012 AN - OPUS4-27123 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert A1 - Rethmeier, Michael T1 - Influence of Electrode Caps on the Process Reliability of Resistance Spot Welding in the Automobile Manufacturing T2 - MSE 2012 CY - Darmstadt, Germany DA - 2012-09-25 PY - 2012 AN - OPUS4-27124 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert A1 - Thommes, H. A1 - Bschorr, T. A1 - Cramer, H. A1 - Hahn, O. A1 - Rethmeier, Michael T1 - Weldbonding of High Strength Steels in Automotive Body-in-White Applications T2 - EURADH 2012 CY - Friedrichshafen, Germany DA - 2012-09-16 PY - 2012 AN - OPUS4-27125 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Brauser, Stephan A1 - Pepke, Lutz-Alexander A1 - Weber, Gert A1 - Rethmeier, Michael A1 - Göklü, S. T1 - Einfluss der Schweißstromform auf die Schweißbereiche und die Festigkeit beim Widerstandpunktschweißen moderner Automobilwerkstoffe T2 - 21. DVS-Sondertagung "Widerstandsschweissen 2010" CY - Duisburg, Deutschland DA - 2010-05-05 KW - Widerstandschweißen KW - Schweißbereiche KW - Anlagenkonfiguration KW - Schwingfestigkeit PY - 2010 SP - 1 EP - 7(?) CY - Duisburg AN - OPUS4-21561 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Weber, Gert A1 - Thommes, H. A1 - Gaul, Holger A1 - Hahn, O. A1 - Rethmeier, Michael T1 - Resistance spot welding and weldbonding of advanced high strength steels KW - Resistance spot welding KW - High strength steel KW - Weldbonding KW - Widerstandspunktschweißen KW - Hochfester Stahl KW - Punktschweißkleben PY - 2010 U6 - https://doi.org/10.1002/mawe.201000687 SN - 0933-5137 SN - 1521-4052 VL - 41 IS - 11 SP - 931 EP - 939 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-22948 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Weber, Gert A1 - Rethmeier, Michael A1 - Göklü, S. ED - P. Mayr, ED - G. Posch, ED - H. Cerjak, T1 - Influence of the type of electrode caps on the welding current ranges and the process reliability in resistance spot welding T2 - 61st Annual Assembly and International Conference of the International Institute of Welding (IIW) "Safety and Reliability of Welded Components in Energy and Processing Industry" CY - Graz, Austria DA - 2008-07-06 PY - 2008 SN - 978-3-85125-019-0 IS - IIW Doc. No. III-1484-08 SP - 1 EP - 16(?) PB - Verlag der Technischen Universität Graz CY - Graz, Austria AN - OPUS4-19386 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert A1 - Göklü, Sinasi T1 - Widerstandspunktschweißen hoch fester Mehrphasenstähle (AHSS) für den Karosserieleichtbau T2 - 30. Fachtagung: "Prozesskette Karosserie" Karosserieleichtbaufertigung im Automobiljahr 2006 plus produktionsoptimierte Fertigungstechniken u -systeme CY - Leipzig, Germany DA - 2006-05-09 PY - 2006 AN - OPUS4-19380 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert A1 - Brauser, Stephan A1 - Rethmeier, Michael A1 - Bschorr, T. A1 - Cramer, H. A1 - Hahn, O. A1 - Thommes, H. T1 - Hybrid Bonding of Advanced High Strength Steels (AHSS) in the Lightweight Body Shell Design for the Automobile Manufacturing T2 - 3rd International Conference on Advanced Computation Engineering, Mechanics and Experimenting (ACE-X 2009) CY - Rome, Italy DA - 2009-06-22 PY - 2009 AN - OPUS4-20368 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert A1 - Rethmeier, Michael A1 - Brauser, Stephan T1 - Extended Weldability Lobes in Resistance Spot Welding of Advanced High Strength Steels (AHSS) T2 - EUROJOIN 7 - Seventh European Congress on Joining Technology CY - Venice, Italy DA - 2009-05-21 PY - 2009 AN - OPUS4-20369 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert A1 - Rethmeier, Michael A1 - Brauser, Stephan A1 - Pepke, Lutz-Alexander T1 - Description of Welding Current Ranges by Extended Weldability Lobes in Resistance Spot Welding T2 - Select Committee "Automotive and Road Transport" Intermediate Meeting CY - Wolfsburg, Germany DA - 2009-03-24 PY - 2009 AN - OPUS4-20372 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Brauser, Stephan A1 - Pepke, Lutz-Alexander A1 - Weber, Gert A1 - Rethmeier, Michael T1 - Deformation behaviour of spot-welded high strength steels for automotive applications N2 - Numerical simulation of component and assembly behaviour under different loading conditions is a main tool for safety design in automobile body shell mass production. Knowledge of local material behaviour is fundamental to such simulation tests. As a contribution to the verification of simulation results, the local deformation properties of spot-welded similar and dissimilar material joints in shear tension tests were investigated in this study for a TRIP steel (HCT690T) and a micro-alloyed steel (HX340LAD). For this reason, the local strain distribution was calculated by the digital image correlation technique (DIC). On the basis of the hardness values and microstructure of the spot welds, the differences in local strain between the selected material combinations are discussed. Additionally, the retained austenite content in the TRIP steel was analysed to explain the local strain values. Results obtained in this study regarding similar material welds suggest significant lower local strain values of the TRIP steel HCT690T compared to HX340LAD. One reason could be the decrease of retained austenite in the welded area. Furthermore, it has been ascertained that the local strain in dissimilar material welds decreases for each component compared with the corresponding similar material weld. KW - Resistance spot welding KW - Deformation behaviour KW - Advanced high strength steel KW - TRIP steel KW - Similar and dissimilar material spot weld KW - EBSD KW - SEM KW - Strain field PY - 2010 U6 - https://doi.org/10.1016/j.msea.2010.07.091 SN - 0921-5093 SN - 1873-4936 VL - 527 IS - 26 SP - 7099 EP - 7108 PB - Elsevier CY - Amsterdam AN - OPUS4-21921 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Weber, Gert A1 - Gaul, Holger A1 - Rethmeier, Michael ED - Kolleck, R. T1 - Joining of ultra high strength steels for lightweight body shell design in automobile manufacturing T2 - 50th IDDRG anniversary conference - Tools and technologies for the processing of ultra high strength steels CY - Graz, Austria DA - 2010-05-31 KW - Advanced high strength steels KW - Resistance spot welding KW - Weldbonding KW - Lightweight body shell design KW - Process reliability PY - 2010 SN - 978-3-85125-108-1 U6 - https://doi.org/10.3217/978-3-85125-108-1-094 SP - 885 EP - 898 PB - Verlag der Technischen Universität Graz CY - Graz, Austria AN - OPUS4-22472 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Gaul, Holger A1 - Weber, Gert A1 - Rethmeier, Michael T1 - Influence of HAZ cracks on fatigue resistance of resistance spot welded joints made of advanced high strength steels N2 - A method is reported with which heat affected zone (HAZ) cracks in a specific region of spot welded joints, made of advanced high strength steels, could be realised. The influence of HAZ cracks on the fatigue behaviour, which is the focus of the contribution, was studied by evaluating the stiffness characteristics as a function of the number of cycles N in comparison with crack-free specimens, i.e. by analysing HAZ and fatigue cracks on the specimen surface and the surface of fatigue fractures containing beach marks. It was found that the fatigue cracks are not initiated at the HAZ cracks. The number of cycles to failure Nf is not significantly reduced for specimens with HAZ cracks. Overall, the examinations did not reveal any influence of HAZ cracks on the fatigue strength of resistance spot welded joints. KW - Discontinuities KW - AHSS KW - HAZ crack KW - Spot welding KW - Advanced high strength steels KW - Fatigue PY - 2011 U6 - https://doi.org/10.1179/1362171810Y.0000000031 SN - 1362-1718 SN - 1743-2936 VL - 16 IS - 5 SP - 440 EP - 445 PB - Maney CY - London AN - OPUS4-24214 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert A1 - Rethmeier, Michael A1 - Brauser, Stephan T1 - Extended weldability lobes in resistance spot welding of advanced high strength steels (AHSS) T2 - EUROJOIN 7 - 7th European congress on joining technology CY - Venice, Italy DA - 2009-05-21 KW - Resistance welding KW - High strength steels PY - 2009 IS - Technical Session 2 SP - 1 EP - 15 AN - OPUS4-20524 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Gaul, Holger A1 - Weber, Gert A1 - Rethmeier, Michael T1 - Evaluation of fatigue crack propagation in spot welded joints by stiffness measurements N2 - Resistance spot welded joints made of two advanced high strength steels (AHSS) and one high strength steel (HSS) were examined. In the high cycle fatigue regime tests were realised for one loading condition, and the load and the displacement were measured. From the load and displacement range, the stiffness was calculated and in situ normalised to its value after 1000 cycles. It was thus possible to use the normalised stiffness evaluated during the experiment as failure criterion for the fatigue test of resistance spot welded joints. In order to evaluate this failure criterion, fatigue cracks were produced in the three different steel grades mentioned above according to user-specified levels of the normalised stiffness. It was found that the fatigue crack area increases linearly and the through-sheet-thickness crack length exponentially with decreasing stiffness. The comparison of the fatigue crack propagation during the fatigue test of the three different tested base metals showed very similar values. The comparability of fatigue tests performed on spot welded joints might thus be improved by the in situ evaluated stiffness as a failure criterion. This can be also used in further work to verify results of computer simulations of the stress intensity factor at spot welds with the help of experimental results. KW - Resistance spot welding KW - Fatigue KW - Frequency KW - Stiffness KW - Advanced high strength steels KW - Crack growth PY - 2011 U6 - https://doi.org/10.1016/j.ijfatigue.2010.12.005 SN - 0142-1123 VL - 33 IS - 5 SP - 740 EP - 745 PB - Elsevier CY - Oxford AN - OPUS4-22207 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Brauser, Stephan A1 - Weber, Gert A1 - Rethmeier, Michael T1 - Potenzial optischer Dehnungsfeldmessung zur Charakterisierung der Eigenschaften von Widerstandspunktschweißverbindungen N2 - Die Ermittlung lokaler Werkstoffkennwerte im Schweißbereich ist für die Auslegung sicherheitsrelevanter Bauteile insbesondere durch Finite-Elemente-Berechnungen von großer Bedeutung. Konventionelle Prüfmethoden können lediglich globale Kennwerte bereitstellen, die jedoch gerade für die Berechnung widerstandspunktgeschweißter Bauteile häufig nicht ausreichen, da diese durch das Vorliegen örtlich eng begrenzter Fügezonen gekennzeichnet sind. Moderne Prüfmethoden wie die optische Dehnungsfeldmessung ermöglichen hingegen eine orts- und zeitkonkrete Bestimmung der Werkstoffkenndaten. Um das Potenzial optischer Dehnungsfeldmessungen für das Charakterisieren des lokalen Werkstoffverhaltens von Punktschweißverbindungen zu ermitteln, wurden Scherzugversuche sowie Zugversuche an widerstandspunktgeschweißten hochfesten Stählen durchgeführt. Die Ergebnisse zeigen das hohe Potenzial dieses Verfahrens sowohl für die Quantifizierung des lokalen Dehnungsverhaltens im Fügebereich als auch für die Ermittlung lokaler Werkstoffkenndaten. PY - 2010 SN - 0036-7184 VL - 62 IS - 9 SP - 496 EP - 500 PB - Verl. für Schweißen u. Verwandte Verfahren, DVS-Verl. CY - Düsseldorf AN - OPUS4-22163 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert A1 - Gaul, Holger A1 - Rethmeier, Michael T1 - Resistance Spot Welding and Weldbonding of Advanced High Strength Steels T2 - MSE 2010 CY - Darmstadt, Germany DA - 2010-08-24 PY - 2010 AN - OPUS4-22150 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Gert A1 - Gaul, Holger A1 - Rethmeier, Michael T1 - Mechanical Properties of Weldbonded Joints of Advanced High Strength Steels T2 - 4th International Conference on Advanced Computational Engineering and Experimenting, ACE-X CY - Paris, France DA - 2010-07-08 PY - 2010 AN - OPUS4-22151 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Rethmeier, Michael A1 - Momeni, Kaveh A1 - Schippereit, Christian A1 - Weber, Gert T1 - Einfluss von fertigungsbedingten Spalten auf das Tragverhalten der Widerstandspunktschweißverbindungen aus hochfesten Stählen N2 - In einem Forschungsvorhaben wurde der Einfluss von fertigungsbedingten Spalten von bis zu 3 mm auf das Tragverhalten der Widerstandspunktschweißverbindungen aus Stählen am Beispiel von HX340LAD+Z (Werkstoffnummer 1.0933), HCT780X+Z (1.0943), HCT980C (1.0955) und 22MnB5+AS140 untersucht. Neben spaltabhängigen Schweißbereichen wurden auch statische Festigkeit, dynamische Festigkeit sowie Schwingfestigkeit betrachtet. Schließlich wurden ein Prozesssicherheitskoeffizient sowie eine Prozess-Festigkeits-Kenngröße abgeleitet, mit deren Hilfe der Anwender das Verhalten der Punktschweißverbindungen unter Spalteinfluss beurteilen kann. KW - resistance spot welding KW - strength KW - quality assurance KW - Qualitätssicherung KW - Festigkeit KW - Widerstandspunktschweißen PY - 2016 SN - 0036-7184 VL - 68 IS - 1-2 SP - 22 EP - 27 PB - DVS Media GmbH CY - Düsseldorf AN - OPUS4-35366 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -