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Cobalt alloys and their weld ability
Herčík, Tomáš ; Mrňa, Libor (referee) ; Sigmund, Marian (advisor)
The bachelor thesis is focused on the evaluation of the current state of use of cobalt and cobalt alloys. Due to its shortage and the growing need for precious metal for the production of Li-on batteries, its price, which is now almost at silver prices, is also rising. Some countries even described it as critical and they have bought it in large quantities. From 2020, it is expected that all cobalt will be reserved for the automotive industry, where the use of cobalt in batteries increases their capacity. It is therefore time to look for ways in which precious metal is economised in existing applications. This also includes welding. Of the existing welding technologies, laser welding looks to be the best. In this case no additional material is needed which reduces the need for cobalt. This technology was verified in the experimental part and evaluated by destructive tests (microhardness, microstructure, macrostructure).
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Weldability of cobalt alloys by hybrid method Laser-TIG
Herčík, Tomáš ; Mrňa, Libor (referee) ; Sigmund, Marian (advisor)
The master thesis summarizes the critical situation of the lack of a cobalt used in different industry branches. Due to its increasing price, it will not be possible to use in existing applications. One of these applications is production of cobalt alloys where the replacement of this element is impossible. This type of material keeps mechanical properties at high temperature. However, a suitable choice of technology can achieve at least its savings. In the field of welding, the alloys are joined without any use of an additional material. The possible solution could be the use of hybrid technologies or electron beam. Verification of weldability of both methods was realised in experimental parts and evaluated by destructive methods. The investigation was performed on wear resistant alloy Stellite 6B.
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Weldability of cobalt alloys by hybrid method Laser-TIG
Herčík, Tomáš ; Mrňa, Libor (referee) ; Sigmund, Marian (advisor)
The master thesis summarizes the critical situation of the lack of a cobalt used in different industry branches. Due to its increasing price, it will not be possible to use in existing applications. One of these applications is production of cobalt alloys where the replacement of this element is impossible. This type of material keeps mechanical properties at high temperature. However, a suitable choice of technology can achieve at least its savings. In the field of welding, the alloys are joined without any use of an additional material. The possible solution could be the use of hybrid technologies or electron beam. Verification of weldability of both methods was realised in experimental parts and evaluated by destructive methods. The investigation was performed on wear resistant alloy Stellite 6B.
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|
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Cobalt alloys and their weld ability
Herčík, Tomáš ; Mrňa, Libor (referee) ; Sigmund, Marian (advisor)
The bachelor thesis is focused on the evaluation of the current state of use of cobalt and cobalt alloys. Due to its shortage and the growing need for precious metal for the production of Li-on batteries, its price, which is now almost at silver prices, is also rising. Some countries even described it as critical and they have bought it in large quantities. From 2020, it is expected that all cobalt will be reserved for the automotive industry, where the use of cobalt in batteries increases their capacity. It is therefore time to look for ways in which precious metal is economised in existing applications. This also includes welding. Of the existing welding technologies, laser welding looks to be the best. In this case no additional material is needed which reduces the need for cobalt. This technology was verified in the experimental part and evaluated by destructive tests (microhardness, microstructure, macrostructure).
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