The importance of laser welding in industry is reflected in its high precision and low heat input. This technology enables the welding of thin and medium-thick materials with high weld quality and minimal deformation. The master’s thesis focuses on the influence of input parameters on the output parameters of laser welding of stainless steel. When optimizing technological parameters from the perspective of economic efficiency and weld quality, it became apparent that the key parameters are the power and speed of the laser beam. The quality of the welds was evaluated visually, based on surface color, using a pressure test and microscopic analysis. The design of experiments method was used to analyze the results of the pressure tests and microscopic measurements. Acceptance criteria and calculations of the output variables were presented. By welding larger heat exchangers, process times were determined and the potential savings from switching to a laser welding machine or laser technology were estimated. It was discovered that the new technology enables higher welding speeds and better weld quality. The welding of heat exchangers with a 0,8 mm double wall and a 2 mm base wall was compared using a fiber laser and a CO2 laser.
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