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Influence of shielding gas on weld properties of conductive laser welding of sheet from carbon steel
Kotrík, Marcel ; Sigmund, Marian (oponent) ; Mrňa, Libor (vedoucí práce)
In the thesis are analysed influences of three shield gases, based on literary pursuit. Compared was influence of the gas consisting of pure Ar, mixture Ar with 3vol.% CO2 and the mixture Ar with 18vol.% CO2 on mechanical properties of conduction laser welded blunt welds made from structural steel DC01 and S235JR with thickness 3mm and 2mm. Compared were strength properties of the welds in tension, weld hardness and hardness of the heat affected area under the low stress. Further was observed and compared stream of the gases during welding process and its influences on the appearance of the trial welds. On the metallographical cuts of the welds were evaluated mistakes and dimensions of the welds.
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Welding of bike frames
Kotrík, Marcel ; Daněk, Ladislav (oponent) ; Kubíček, Jaroslav (vedoucí práce)
In my bachelor thesis I elaborated an overview of suitable materials for the manufacturing of bicycle frames. Most preferred materials for mass production of bicycle frames are cured aluminum alloys. The best method for joining aluminum tubular frame construction is fusion welding at robot lines in a protective atmosphere of inert gas. We measured the hardness of the welded metal, heat affected zone and base material at the weld of the bicycle frame. Values are very similar in all areas, so the whole frame structure was cured. We welded a test weld, using TIG method. Hardness of the test weld is about 24.5 % lower, than hardness of the weld from manufacturer. Hardness of the heat affected zone is even lower. The curing of the whole frame construction is therefore very important. There is a concentration cavity in the cut of the weld from manufacturer and the root of the weld is not welded all over. The same defects are in the cuts of our test welds, there is also porosity in one of the test welds. But the test weld is satisfying, despite the defects.
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Influence of shielding gas on weld properties of conductive laser welding of sheet from carbon steel
Kotrík, Marcel ; Sigmund, Marian (oponent) ; Mrňa, Libor (vedoucí práce)
In the thesis are analysed influences of three shield gases, based on literary pursuit. Compared was influence of the gas consisting of pure Ar, mixture Ar with 3vol.% CO2 and the mixture Ar with 18vol.% CO2 on mechanical properties of conduction laser welded blunt welds made from structural steel DC01 and S235JR with thickness 3mm and 2mm. Compared were strength properties of the welds in tension, weld hardness and hardness of the heat affected area under the low stress. Further was observed and compared stream of the gases during welding process and its influences on the appearance of the trial welds. On the metallographical cuts of the welds were evaluated mistakes and dimensions of the welds.
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Welding of bike frames
Kotrík, Marcel ; Daněk, Ladislav (oponent) ; Kubíček, Jaroslav (vedoucí práce)
In my bachelor thesis I elaborated an overview of suitable materials for the manufacturing of bicycle frames. Most preferred materials for mass production of bicycle frames are cured aluminum alloys. The best method for joining aluminum tubular frame construction is fusion welding at robot lines in a protective atmosphere of inert gas. We measured the hardness of the welded metal, heat affected zone and base material at the weld of the bicycle frame. Values are very similar in all areas, so the whole frame structure was cured. We welded a test weld, using TIG method. Hardness of the test weld is about 24.5 % lower, than hardness of the weld from manufacturer. Hardness of the heat affected zone is even lower. The curing of the whole frame construction is therefore very important. There is a concentration cavity in the cut of the weld from manufacturer and the root of the weld is not welded all over. The same defects are in the cuts of our test welds, there is also porosity in one of the test welds. But the test weld is satisfying, despite the defects.
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