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Grain refinement, hot crack prevention, aluminum, laser welding. - Due to the high beam quality of modern disk lasers slim and deep welds can be produced, which results in coarse columnar grain structures in the weld. Such kind of structures has a high hot cracking susceptibility. Therefore, the aim of this study is to increase the weld-ability of laser welds of aluminum alloys by grain refinement. In order realize grain re-finement, the weld grain structure was investigated depending on Ti/B-contents and weld parameters. Based on this investigation, the influence of grain refinement on hot crack susceptibility was studied via DELTA test. In order to understand the mechanism of hot cracking prevention by grain refinement, an analytical model was developed which de-scribes the influences of the grain structure and solidification parameters on the three main factors, which are the duration of the mush zone, the capillary pressure as well as the permeability of the dendritic network in the melt pool. The model reveals that the hot cracking susceptibility is determined by the combination of these three factors. With this model the hot cracking susceptibility can be quantitatively predicted depending on the grain structure. Thanks to this work, a knowledge base has been created for a controllable increase of weldability by grain refinement. |
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Tang, Zhuo aut, Heißrissvermeidung beim Schweißen von Aluminiumlegierungen mit einem Scheibenlaser von Zhuo Tang, 2014, Online-Ressource, Text txt rdacontent, Computermedien c rdamedia, Online-Ressource cr rdacarrier, Auch als: Strahltechnik ; Bd. 53, Bremen, Univ., Diss., 2014, Grain refinement, hot crack prevention, aluminum, laser welding. - Due to the high beam quality of modern disk lasers slim and deep welds can be produced, which results in coarse columnar grain structures in the weld. Such kind of structures has a high hot cracking susceptibility. Therefore, the aim of this study is to increase the weld-ability of laser welds of aluminum alloys by grain refinement. In order realize grain re-finement, the weld grain structure was investigated depending on Ti/B-contents and weld parameters. Based on this investigation, the influence of grain refinement on hot crack susceptibility was studied via DELTA test. In order to understand the mechanism of hot cracking prevention by grain refinement, an analytical model was developed which de-scribes the influences of the grain structure and solidification parameters on the three main factors, which are the duration of the mush zone, the capillary pressure as well as the permeability of the dendritic network in the melt pool. The model reveals that the hot cracking susceptibility is determined by the combination of these three factors. With this model the hot cracking susceptibility can be quantitatively predicted depending on the grain structure. Thanks to this work, a knowledge base has been created for a controllable increase of weldability by grain refinement., Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content, Forschungsbericht (DE-588)4155043-2 (DE-627)10467444X (DE-576)209815833 gnd-content, s (DE-588)4053870-9 (DE-627)106165119 (DE-576)209106085 Schweißen gnd, s (DE-588)4159464-2 (DE-627)104688343 (DE-576)209850485 Heißriss gnd, s (DE-588)4001586-5 (DE-627)106396617 (DE-576)208843418 Aluminiumlegierung gnd, s (DE-588)4697075-7 (DE-627)352968974 (DE-576)215151569 Scheibenlaser gnd, DE-101, Bremen (DE-588)4008135-7 (DE-627)106369636 (DE-576)208874569 pup, Druckausg. Tang, Zhuo Heißrissvermeidung beim Schweißen von Aluminiumlegierungen mit einem Scheibenlaser Bremen : BIAS, 2014 XIII, 99 S. (DE-627)840987609 (DE-576)406576130 9783933762474, Druckausg. Tang, Zhuo Heißrissvermeidung beim Schweißen von Aluminiumlegierungen mit einem Scheibenlaser 2014 XIII, 99 S (DE-627)783990421, http://nbn-resolving.de/urn:nbn:de:gbv:46-00103706-14 Resolving-System kostenfrei Volltext, DE-105 epn:3398560032 2018-06-28T10:22:44Z, http://nbn-resolving.de/urn:nbn:de:gbv:46-00103706-14 LFER, LFER epn:3398560148 2014-06-13T00:00:00Z |
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Tang, Zhuo, Heißrissvermeidung beim Schweißen von Aluminiumlegierungen mit einem Scheibenlaser, Grain refinement, hot crack prevention, aluminum, laser welding. - Due to the high beam quality of modern disk lasers slim and deep welds can be produced, which results in coarse columnar grain structures in the weld. Such kind of structures has a high hot cracking susceptibility. Therefore, the aim of this study is to increase the weld-ability of laser welds of aluminum alloys by grain refinement. In order realize grain re-finement, the weld grain structure was investigated depending on Ti/B-contents and weld parameters. Based on this investigation, the influence of grain refinement on hot crack susceptibility was studied via DELTA test. In order to understand the mechanism of hot cracking prevention by grain refinement, an analytical model was developed which de-scribes the influences of the grain structure and solidification parameters on the three main factors, which are the duration of the mush zone, the capillary pressure as well as the permeability of the dendritic network in the melt pool. The model reveals that the hot cracking susceptibility is determined by the combination of these three factors. With this model the hot cracking susceptibility can be quantitatively predicted depending on the grain structure. Thanks to this work, a knowledge base has been created for a controllable increase of weldability by grain refinement., Hochschulschrift, Forschungsbericht, Schweißen, Heißriss, Aluminiumlegierung, Scheibenlaser |
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| title |
Heißrissvermeidung beim Schweißen von Aluminiumlegierungen mit einem Scheibenlaser |
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Heißrissvermeidung beim Schweißen von Aluminiumlegierungen mit einem Scheibenlaser |
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Heißrissvermeidung beim Schweißen von Aluminiumlegierungen mit einem Scheibenlaser von Zhuo Tang |
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Heißrissvermeidung beim Schweißen von Aluminiumlegierungen mit einem Scheibenlaser von Zhuo Tang |
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Heißrissvermeidung beim Schweißen von Aluminiumlegierungen mit einem Scheibenlaser von Zhuo Tang |
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Heißrissvermeidung beim Schweißen von Aluminiumlegierungen mit einem Scheibenlaser |
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heißrissvermeidung beim schweißen von aluminiumlegierungen mit einem scheibenlaser |
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Heißrissvermeidung beim Schweißen von Aluminiumlegierungen mit einem Scheibenlaser |
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Hochschulschrift, Forschungsbericht, Schweißen, Heißriss, Aluminiumlegierung, Scheibenlaser |
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