The master thesis embraces an overview of scientific literature in the field of laser welding, tool steels and weldability of materials. It presents challenges in repair welding of highly polished surfaces of tools for plastic injection moulding. A description is provided of the materials and the equipment used as well as the thesis methodology. The experimental part deals with the influence of laser welding parameters on the properties of non-welded polished surfaces. By visual analysis, roughness and profile measurement, hardness measurements and microstructural analysis, we conducted a research of the quality of polished surfaces welded within various welding parameters. We discovered that a polished surface of a tool for plastic injection moulding can be successfully remanufactured by laser welding.
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