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23. Intelligente Schweißroboter

Author

Rieck, Sebastian, primary, Gericke, Andreas, additional, Dryba, Steffen, additional, Henkel, Knuth-Michael, additional, and Flügge, Wilko, additional

Published
2022
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24. HFH‐Nachbehandlung höchstfester Baustähle – Erweiterung der DASt‐Richtlinie 026 – Kerbfalleinstufung unter Berücksichtigung geometrischer Fertigungsimperfektionen

Author

Ummenhofer, Thomas, primary, Kuhlmann, Ulrike, additional, Henkel, Knuth‐Michael, additional, Flügge, Wilko, additional, Weidner, Philipp, additional, Armbruster, Katrin, additional, Gölz, Lisa‐Marie, additional, Gericke, Andreas, additional, and Ripsch, Benjamin, additional

Published
2022
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27. HFH-Nachbehandlung höchstfester Baustähle - Erweiterung der DASt-Richtlinie 026 - Kerbfalleinstufung unter Berücksichtigung geometrischer Fertigungsimperfektionen

Author

Ummenhofer, Thomas, Kuhlmann, Ulrike, Henkel, Knuth-Michael, Flügge, Wilko, Weidner, Philipp, Armbruster, Katrin, Gölz, Lisa Marie, Gericke, Andreas, Ripsch, Benjamin, and Publica

Subjects
HFMI, welding and cutting, DASt-guideline 026, steel buildings, fatigue, post-weld treatment, high frequency mechanical impact treatment, materials
Abstract

HFMI-treatment of ultrahigh-strength steels – extension of the DASt-guideline 026. In the case of highly loaded steel structures such as wind towers or bridges, the use of newer ultra-high-strength structural steels is interesting, but the fatigue verification is usually decisive for these structures. Standards and guidelines specify detail categories for fatigue assessment that are independent of material strength, so there is no benefit regarding the use of high-strength steels in fatigue loaded structures. By using post-weld treatment by high-frequency mechanical impact treatment (HFMI), the fatigue strength of welded joints can be increased to a great extent. Previous investigations show an increasing effectiveness of HFMI-treatment with increasing material strength. The new DASt-guideline 026 gives rules for the fatigue assessment of constructional details made of steel grades reaching from S235 to S700 after the application of HFMI-treatment. An extension for steels up to a steel grade of S960 is pending and geometric imperfections exceeding weld quality level B of ISO 5817 are not covered yet. The objective of the current AiF-FOSTA project 21410 BG (P 1505) is to develop the basis for an extension of the DASt-guideline 026 for high strength steels up to a steel grade of S960 and to investigate the influence of increased imperfections on the fatigue strength of HFMI-treated welds. Therefore, experimental investigations are carried out on constructional details with and without imperfections. Moreover, the influence of various imperfections is analysed numerically. In the following, the project is presented and first project results are shown.

Published
2022

30. Investigation of Diffusible Hydrogen Concentration in Gas Metal Arc Brazing by Carrier Gas Hot Extraction Method Referring to ISO 3690.

Author

Brätz, Oliver, Ripsch, Benjamin, Gericke, Andreas, and Henkel, Knuth-Michael

Subjects
FILLER metal, HOT carriers, BRAZING alloys, GAS metal arc welding, GAS well drilling, CARRIER gas, STEEL fracture
Abstract

Arc brazing is an alternative joining technology well-suited for processing thermally sensitive materials and to produce mixed material connections. Due to the technological similarities of gas metal arc brazing to gas metal arc welding, it can be assumed that the process-related hydrogen input is of similar magnitude for both joining technologies. Since diffusible hydrogen is known to cause embrittlement in metallic materials, it is necessary to know the amount of diffusible hydrogen introduced by different manufacturing processes. Regarding the qualification of welding procedures, hydrogen ingress is an important factor to evaluate the risk of hydrogen-assisted cold cracking, especially when processing high-strength steels. For arc brazing, there is a lack of knowledge about the process-related hydrogen input. Hence, to study the influence of different brazing filler materials and varying levels of heat input on the diffusible hydrogen concentration in arc braze metal, a methodology to determine hydrogen content in arc weld metal in accordance with international standard ISO 3690 based on carrier gas hot extraction was applied to arc brazed specimens. Very low diffusible hydrogen concentrations of about HD = 0.1 to 0.3 mL/100 g were found for GMAB without significant influence of arc energy or filler metal used. [ABSTRACT FROM AUTHOR]

Published
2023
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31. Soil erosion modelling: A global review and statistical analysis

Author

Borrelli, Pasquale, primary, Alewell, Christine, additional, Alvarez, Pablo, additional, Ayach Anache, Jamil Alexandre, additional, Baartman, Jantiene, additional, Ballabio, Cristiano, additional, Bezak, Nejc, additional, Biddoccu, Marcella, additional, Cerdà, Artemi, additional, Chalise, Devraj, additional, Chen, Songchao, additional, Chen, Walter, additional, De Girolamo, Anna Maria, additional, Desta Gessesse, Gizaw, additional, Deumlich, Detlef, additional, Diodato, Nazzareno, additional, Efthimiou, Nikolaos, additional, Erpul, Gunay, additional, Fiener, Peter, additional, Freppaz, Michele, additional, Gentile, Francesco, additional, Gericke, Andreas, additional, Haregeweyn, Nigussie, additional, Hu, Bifeng, additional, Jeanneau, Amelie, additional, Kaffas, Konstantinos, additional, Kiani-Harchegani, Mahboobeh, additional, Lizaga Villuendas, Ivan, additional, Li, Changjia, additional, Lombardo, Luigi, additional, López-Vicente, Manuel, additional, Lucas-Borja, Manuel Esteban, additional, Märker, Michael, additional, Miao, Chiyuan, additional, Mikoš, Matjaž, additional, Modugno, Sirio, additional, Möller, Markus, additional, Naipal, Victoria, additional, Nearing, Mark, additional, Owusu, Stephen, additional, Panday, Dinesh, additional, Patault, Edouard, additional, Patriche, Cristian Valeriu, additional, Poggio, Laura, additional, Portes, Raquel, additional, Quijano, Laura, additional, Reza Rahdari, Mohammad, additional, Renima, Mohammed, additional, Ricci, Giovanni Francesco, additional, Rodrigo-Comino, Jesús, additional, Saia, Sergio, additional, Nazari Samani, Aliakbar, additional, Schillaci, Calogero, additional, Syrris, Vasileios, additional, Soo Kim, Hyuck, additional, Noses Spinola, Diogo, additional, Tarso Oliveira, Paulo, additional, Teng, Hongfen, additional, Thapa, Resham, additional, Vantas, Konstantinos, additional, Vieira, Diana, additional, Yang, Jae, additional, Yin, Shuiqing, additional, Zema, Demetrio, additional, Zhao, Guangju, additional, and Panagos, Panos, additional

Published
2022
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34. Soil erosion modelling: A global review and statistical analysis

Author

Borrelli, Pasquale, primary, Alewell, Christine, additional, Alvarez, Pablo, additional, Anache, Jamil Alexandre Ayach, additional, Baartman, Jantiene, additional, Ballabio, Cristiano, additional, Bezak, Nejc, additional, Biddoccu, Marcella, additional, Cerdà, Artemi, additional, Chalise, Devraj, additional, Chen, Songchao, additional, Chen, Walter, additional, De Girolamo, Anna Maria, additional, Gessesse, Gizaw Desta, additional, Deumlich, Detlef, additional, Diodato, Nazzareno, additional, Efthimiou, Nikolaos, additional, Erpul, Gunay, additional, Fiener, Peter, additional, Freppaz, Michele, additional, Gentile, Francesco, additional, Gericke, Andreas, additional, Haregeweyn, Nigussie, additional, Hu, Bifeng, additional, Jeanneau, Amelie, additional, Kaffas, Konstantinos, additional, Kiani-Harchegani, Mahboobeh, additional, Villuendas, Ivan Lizaga, additional, Li, Changjia, additional, Lombardo, Luigi, additional, López-Vicente, Manuel, additional, Lucas-Borja, Manuel Esteban, additional, Märker, Michael, additional, Matthews, Francis, additional, Miao, Chiyuan, additional, Mikoš, Matjaž, additional, Modugno, Sirio, additional, Möller, Markus, additional, Naipal, Victoria, additional, Nearing, Mark, additional, Owusu, Stephen, additional, Panday, Dinesh, additional, Patault, Edouard, additional, Patriche, Cristian Valeriu, additional, Poggio, Laura, additional, Portes, Raquel, additional, Quijano, Laura, additional, Rahdari, Mohammad Reza, additional, Renima, Mohammed, additional, Ricci, Giovanni Francesco, additional, Rodrigo-Comino, Jesús, additional, Saia, Sergio, additional, Samani, Aliakbar Nazari, additional, Schillaci, Calogero, additional, Syrris, Vasileios, additional, Kim, Hyuck Soo, additional, Spinola, Diogo Noses, additional, Oliveira, Paulo Tarso, additional, Teng, Hongfen, additional, Thapa, Resham, additional, Vantas, Konstantinos, additional, Vieira, Diana, additional, Yang, Jae E., additional, Yin, Shuiqing, additional, Zema, Demetrio Antonio, additional, Zhao, Guangju, additional, and Panagos, Panos, additional

Published
2021
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36. Soil erosion modelling: A bibliometric analysis

Author

Bezak, Nejc, primary, Mikoš, Matjaž, additional, Borrelli, Pasquale, additional, Alewell, Christine, additional, Alvarez, Pablo, additional, Anache, Jamil Alexandre Ayach, additional, Baartman, Jantiene, additional, Ballabio, Cristiano, additional, Biddoccu, Marcella, additional, Cerdà, Artemi, additional, Chalise, Devraj, additional, Chen, Songchao, additional, Chen, Walter, additional, De Girolamo, Anna Maria, additional, Gessesse, Gizaw Desta, additional, Deumlich, Detlef, additional, Diodato, Nazzareno, additional, Efthimiou, Nikolaos, additional, Erpul, Gunay, additional, Fiener, Peter, additional, Freppaz, Michele, additional, Gentile, Francesco, additional, Gericke, Andreas, additional, Haregeweyn, Nigussie, additional, Hu, Bifeng, additional, Jeanneau, Amelie, additional, Kaffas, Konstantinos, additional, Kiani-Harchegani, Mahboobeh, additional, Villuendas, Ivan Lizaga, additional, Li, Changjia, additional, Lombardo, Luigi, additional, López-Vicente, Manuel, additional, Lucas-Borja, Manuel Esteban, additional, Maerker, Michael, additional, Miao, Chiyuan, additional, Modugno, Sirio, additional, Möller, Markus, additional, Naipal, Victoria, additional, Nearing, Mark, additional, Owusu, Stephen, additional, Panday, Dinesh, additional, Patault, Edouard, additional, Patriche, Cristian Valeriu, additional, Poggio, Laura, additional, Portes, Raquel, additional, Quijano, Laura, additional, Rahdari, Mohammad Reza, additional, Renima, Mohammed, additional, Ricci, Giovanni Francesco, additional, Rodrigo-Comino, Jesús, additional, Saia, Sergio, additional, Samani, Aliakbar Nazari, additional, Schillaci, Calogero, additional, Syrris, Vasileios, additional, Kim, Hyuck Soo, additional, Spinola, Diogo Noses, additional, Oliveira, Paulo Tarso, additional, Teng, Hongfen, additional, Thapa, Resham, additional, Vantas, Konstantinos, additional, Vieira, Diana, additional, Yang, Jae E., additional, Yin, Shuiqing, additional, Zema, Demetrio Antonio, additional, Zhao, Guangju, additional, and Panagos, Panos, additional

Published
2021
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37. Wirtschaftlich und prozesssicher schweißen.

Author

Banaschik, Richard, Otto, André, Gericke, Andreas, and Henkel, Knuth-Michael

Subjects
GAS metal arc welding, SHIPBUILDING costs, SHIPBUILDING equipment, SHIPBUILDING materials, SHIPBUILDING industry, SHIPYARDS
Abstract

The article reports on the use of electrogas welding in shipbuilding practice under a project by the Universität Rostock, Fraunhofer IGP and the Neptun Werft shipyard. Topics include the reliability and cost efficiency of electrogas welding; and a welding additive developed, produced and approved by Esab Welding & Cutting for German shipyards.

Published
2022

42. Recent and Future Changes in Rainfall Erosivity and Implications for the Soil Erosion Risk in Brandenburg, NE Germany

Author

Gericke, Andreas, Kiesel, Jens, Deumlich, Detlef, and Venohr, Markus

Subjects
lcsh:TD201-500, universal soil loss equation (USLE), lcsh:Hydraulic engineering, R factor, climate change, lcsh:Water supply for domestic and industrial purposes, model ensemble, lcsh:TC1-978, Germany, rainfall erosivity, EURO-CORDEX, trend analysis, uncertainty
Abstract

The universal soil loss equation (USLE) is widely used to identify areas of erosion risk at regional scales. In Brandenburg, USLE R factors are usually estimated from summer rainfall, based on a relationship from the 1990s. We compared estimated and calculated factors of 22 stations with 10-min rainfall data. To obtain more realistic estimations, we regressed the latter to three rainfall indices (total and heavy-rainfall sums). These models were applied to estimate future R factors of 188 climate stations. To assess uncertainties, we derived eight scenarios from 15 climate models and two representative concentration pathways (RCP), and compared the effects of index choice to the choices of climate model, RCP, and bias correction. The existing regression model underestimated the calculated R factors by 40%. Moreover, using heavy-rainfall sums instead of total sums explained the variability of current R factors better, increased their future changes, and reduced the model uncertainty. The impact of index choice on future R factors was similar to the other choices. Despite all uncertainties, the results indicate that average R factors will remain above past values. Instead, the extent of arable land experiencing excessive soil loss might double until the mid-century with RCP 8.5 and unchanged land management.

Published
2019

43. Einfluss der Schweißparameter und Polaritätsmodulationen auf den Werkstoffübergang sowie Zu- und Abbrandverhalten von Legierungselementen beim Unterpulverschweißen

Author

Gericke, Andreas

Subjects
530 Physics, 620 Engineering & allied operations, 600 Technology (Applied sciences)
Abstract

Gegenstand der Untersuchungen sind Kavernenvorgänge und Werkstofftransfer beim Unterpulverschweißen unter besonderer Berücksichtigung des Zu- und Abbrandes von Legierungselementen und Eisenbegleitern. Dabei wurde der Einfluss von Schweißparametervariationen, insbesondere die Wirkung durch Verschiebung des Zeitanteils der Wechselstromhalbwellen, untersucht. Die Untersuchungen wurden an Massiv- und Fülldrähten mit unterschiedlichen Legierungskonzepten durchgeführt. Die Übertragbarkeit der Erkenntnisse auf UP-Mehrdrahtschweißungen wurde durch begleitende chemische Untersuchungen dargestellt.

Published
2019
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48. Wirkung erzwungener Schmelzbaddynamik durch Vibration beim Unterpulverschweißen von Feinkornbaustählen

Author

Gericke, Andreas, Banaschik, Richard, Henkel, Knuth-Michael, and Publica

Subjects
Schweißtechnik, Unterpulverschweißen, Schweißverbindung, Werkstoffeigenschaft, Schweißen
Abstract

Neben Wärmeführung und Legierungskonzept können mechanischtechnologische Eigenschaften einer Schweißverbindung durch die gezielte Einbringung von Vibration ins Schmelzbad verbessert werden. Die Wirkung der daraus resultierenden erzwungenen Schmelzbaddynamik auf das Schweißergebnis wird in den vorgestellten Untersuchungen anhand des Unterpulverschweißens (UP-Schweißen) mit variierenden Vibrationsparametern an Feinkornbaustählen betrachtet. Die aufnehmbare Kerbschlagarbeit konnte signifikant gesteigert werden. Dies ist auf eine feindisperse Verteilung von Mikrophasen sowie Veränderungen in der Primärerstarrung zurückzuführen. Es wurde festgestellt, dass insbesondere die Richtung der induzierten Vibration (parallel oder quer zur Schweißrichtung) für die Beeinflussung der Schmelzbadstandzeit und die veränderten Erstarrungsbedingungen und Gefügemorphologien relevant ist. Die Ergebnisse werden diskutiert und Erklärungsansätze vorgestellt.

Published
2016

49. Optical and spectroscopic study of a submerged arc welding cavern

Author

Gött, Gregor, Gericke, Andreas, Henkel, Knuth-Michael, Uhrlandt, Dirk, and Publica

Subjects
Bildverarbeitungssystem, spectroscopy, digitale Bildverarbeitung, Schweißtechnik, Spektrometrie, Bildverarbeitung, Arc welding, Schweißen
Abstract

For the first time, a combination of high-speed imaging and spatially resolved spectroscopy at 5000 fps was performed on a submerged arc welding process. This was achieved by inserting a thin-gauge steel tunnel into the flux and aligning the diagnostics accordingly. Four processes were observed; both direct current electrode positive (DCEP) and direct current electrode negative (DCEN), as well as alternating current (AC) at 600 A and DCEP with a higher current at 1000 A. The videos show an erratic droplet transfer with a lot of spatter that was caught by the cavern walls and directed into the weld pool. Additionally, flux was molten at the top of the cavern close to the electrode and merged into the droplet that was still attached to the wire. The cavern walls were a mixture of solid flux that was partially falling into the weld pool and molten flux, which created a smooth wall. The surface properties of the cavern wall behind the process was mostly smooth and merged wi th the weld pool, which created a solidifying layer of slag on top of the slowly cooling weld joint. The observed processes showed only a slight change in chemical composition of main alloying elements in the solidified weld joint, while the oxygen content varied significantly in the droplet stage and weld joint between the processes. The high-speed images indicated a correlation between droplet-flux interaction and oxygen content. The spatially resolved spectra showed intense self-reversed lines of Na, Ca, and Mn. Fe lines suggested that the arc was also dominated by metal vapor. Especially during the AC process, a fluctuating emission of Mn lines was observed, which correlated with the frequency of the shifting polarity.

Published
2016

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