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The effect of the change of the scanning speed on the quality of the cladding layer Scanning speed, the surface quality of the cladding layer is obvious, the surface condition of the pores is slightly improved than that of the cladding layer 3, and the flat, smooth, non-porous cladding layer is not continuous. Intermittent Beads, Other Factors Affecting the Quality of the Laser Cladding Layer in Exhaust Valves The pressure of the protective gas affects the quality of the cladding layer. Tests have found that excessive pressure of the shielding gas will increase the surface roughness, and the surface will be uneven and smooth, resulting in wrinkles. If the protective gas pressure is too small, the surface of the cladding layer cannot achieve the purpose of preventing oxidation, and the oxygen in the air will participate in the action of the laser and the powder, causing defects in the cladding layer. The contamination of the lens will also have an effect. Because the light beam is coaxial with the shielding gas, it not only protects the molten pool, but also protects the lens. In the laser processing process, it is inevitable that there is a splash phenomenon. The protective gas can prevent the slag from flying to the focusing lens, so the pressure of the shielding gas can not be ignored. Tooling fixtures are also an important factor affecting the quality of the cladding layer. During laser cladding, tooling fixtures must ensure that the exhaust valve can rotate at a constant speed so that the scanning speed does not change. The beam irradiation position coincides with the slotting position. Otherwise, the cladding layer will deviate, causing the workpiece to be scrapped.
(1) In the exhaust valve pre-coating process, when the laser power, spot diameter, and scanning speed are constant, the coating thickness is 1 mm to 2 mm, and when the blending ratio of the alloy powder to the binder is 2%, it can be ideal. Laser cladding surface quality.
(2) The optimal process parameters for laser cladding of automotive exhaust valves are: laser power 1.8 kW to 2.1 kW, spot diameter 4.5 mm to 5 mm, and scanning speed 5 mm/s to 6 mm/s. Cladding layer continuous, smooth and smooth , Basically no porosity, process stability, can be used for industrial production.
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