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National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Study of laser wobbling welding process through the radiation of plasma plume
 Mrňa, Libor ; Horník, Petr ; Jedlička, Petr ; Pavelka, Jan
During laser welding with wobbling to the vector of the welding speed adds trivial movement of the beam in the shape of a circle or other shapes. Therefore, the laser beam moves with much higher current speeds than during normal welding. The melting of material on the leading edge of the keyhole occurs periodically. This fact is reflected in the character of the radiation of plasma plume over the keyhole. Experiments were conducted in which it was obtained spectrum of plasma plume radiation by using autocorrelation function for different parameters of circular wobbling (circle diameter, frequency) and for different materials. In the spectra are found the higher harmonic frequency of wobbling. The results were also compared with the radiation of the plasma plume during pulsed laser welding where the laser beam also periodically melts the leading edge.
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Schlieren analysis of gas flow in laser technology
 Pavelka, Jan ; Mrňa, Libor ; Horník, Petr ; Jedlička, Petr
Laser technology - cutting and welding require shielding gases to prevent oxidation of materials. Schlieren imaging method visualizes those gas flows. Schlieren imaging can be used for direct monitoring of the gas flows or to analyze interaction of the process gases and molten materials.
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Use schlieren method for displaying flow in laser technologies
 Mrňa, Libor ; Pavelka, Jan
It is important to know the flow of gas protective atmosphere for the laser welding degree of protection of the weld pool from the atmosphere and for the interaction between the gas and the plasma plume rising from the keyhole. The gas flow from the nozzle during laser cutting of material has a significant impact on the quality of the final cut. In both cases the schlieren method a very useful tool for understanding the dynamics of gas flow. There were performed multiple experiments to clarify the flow of various kinds of gas (argon, helium, nitrogen) and their dynamics.
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