Three-dimensional solid parts were prepared through multiple laps and multi layer accumulation of a single cladding layer. Single-pass 1-layer

single-pass 2-layer

and single-pass 5-layer deposition specimens of 34 CrNiMo6 steel were prepared by laser solid forming technology

and the process parameters of laser solid forming 34 CrNiMo6 steel were investigated with laser power

scanning speed and powder feeding rate as control variables and deposition layer thickness or cross-sectional area as reference indicators. The results indicate that through orthogonal and range analysis of the influence of the process parameters on the reference index

it is found that the factors of process parameters are in the order as follows: scanning rate>powder feeding rate>laser power. The optimal process parameter obtained by the orthogonal experiment is laser power of 2 800 W

scanning rate of 600 mm/min

and powder feeding rate of 15 g/min. With the increase in the number of deposited layers

thickness of the single-layer cladding deposited layer is gradually increased in the range of 0.125～0.156 mm. The maximum hardness of the heat-affected zone obtained by the single-pass 1-layer deposition specimen under different process parameters have obviously differences.In the single-pass 5-layer deposition specimen

the surface hardness of the deposition layer is higher than that of the heat-affected zone near the substrate.