Laser technologies are becoming increasingly important in the construction industry, providing accurate and efficient processing of parts, mechanisms of construction machines and materials of building structures. The article presents the results of a study on the formation of a deposited layer of metal powder on sample parts using various nozzle designs that supply directed jets of a mixture of powder welding metal material and inert gas, preventing the ingress of atmospheric gases and providing “gas protection” of the laser processing area, transported from the powder material feed device to the laser processing area through gas-powder tubes. Modifications to the shape and design of the nozzles considered in the work mainly form different temperature effects in the processing area, affecting the result of the surfacing, namely the height of the deposited layer and the depth of mixing, as well as different gas protection of the surfacing area, affecting the qualitative characteristics, such as the absence of defects and others.The article considers various options for using the design of the device for supplying the gas-powder mixture and technological modes to achieve the best result of laser processing. Based on the obtained experimental data and analysis of the results, conclusions are drawn about the advantages and limitations of each design depending on the technological mode of laser operation, and recommendations are made for the choice of the optimal design of the gas-powder mixture supply device.