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Comparison of laser welds with using direct and scanner welding head
Kudr, Martin ; Kubíček, Jaroslav (referee) ; Mrňa, Libor (advisor)
The master thesis presents a comparison of direct laser and scanner welding. At first, using literary studies explained the technology of laser welding, followed by a practical comparison of these methods. The experiments were performed on austenitic stainless steel X5CrNi18-10 and S235JR structural steels. These methods were compared in welding times, geometry and weld hardness, mechanical properties and economy of use in industry. The comparison shows that the scanner welding is qualitatively equivalent to the conventional laser welding and is also economical.
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Advanced laser welding methods
Mrňa, Libor ; Horník, Petr ; Šebestová, Hana
Recently, modern methods of laser welding have been developed. Laser welding methods employing scanning techniques are used. The basis of scanner laser welding is a laser head including system of two computer-controlled deflecting mirrors, supplemented with special optics, allowing fast beam movement over a given area. The second method using deflecting mirrors is wobbling welding. In this method, besides the main movement, laser beam oscillates along the welding trajectory. Weld seam width and microstructure can be varied by controlling of parameters of beam micro-motion.\nAnother advanced method is hybrid laser-TIG welding where arc discharge can serve as a heat source regulating heating or cooling rate. This method can be used for high strength fine-grained steels welding, where the additional heat affects the weld microstructure and the heat affected area and consequently improves mechanical properties of the weld joint.\n
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Comparison of laser welds with using direct and scanner welding head
Kudr, Martin ; Kubíček, Jaroslav (referee) ; Mrňa, Libor (advisor)
The master thesis presents a comparison of direct laser and scanner welding. At first, using literary studies explained the technology of laser welding, followed by a practical comparison of these methods. The experiments were performed on austenitic stainless steel X5CrNi18-10 and S235JR structural steels. These methods were compared in welding times, geometry and weld hardness, mechanical properties and economy of use in industry. The comparison shows that the scanner welding is qualitatively equivalent to the conventional laser welding and is also economical.
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