The thesis examines the process of depositing aluminium bronze CuAl8Ni6 onto tool steel 1.2312 using a handheld fiber laser. The theoretical part presents the fundamentals of laser technology and the properties of the materials used. The experimental part included the production of three series of deposits with different welding parameters, optical microscopy, determination of porosity percentage and dilution rate, as well as Vickers hardness measurements. Results showed that high thermal input increases the formation of cracks and martensitic structures in Heat Affected Zone while reducing the dilution rate. Reducing the heat input eliminated cracks, lowered the dilution rate, and decreased maximum hardness. Preheating the base material to 250 $ˆ°$C reduced the hardness in the heat-affected zone but did not prevent crack formation. The lowest dilution rate and lowest hardness in the heat-affected zone were achieved with reduced heat input, while the deposit height remained comparable to that of other series despite the lower wire feed speed.
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