Matters needing attention in the application of laser cladding in exhaust valve

The effect of the change of scanning speed on the quality of the cladding layer Scanning speed, the surface quality of the cladding layer has obvious fish-scale patterns, and the surface condition with pores is slightly improved than 3. The cladding layer is continuous, smooth, smooth, and discontinuous without pores. Intermittent beads with cavities. Other factors that affect the quality of the laser cladding layer on the exhaust valve. The pressure of the protective gas affects the quality of the cladding layer. Tests have found that if the pressure of the protective gas is too high, the surface roughness will increase, the surface will be uneven and smooth, and wrinkles will occur. If the pressure of the protective gas is too small, one is that the surface of the cladding layer cannot achieve the purpose of anti-oxidation, which will cause the oxygen in the air to participate in the action of the laser and the powder, and cause defects in the cladding layer. Contamination of the lens will also have an impact. Because the beam and the shielding gas are coaxial, it not only protects the molten pool, but also protects the lens. During the laser processing, splashing is inevitable. The shielding gas can prevent the slag from flying to the focusing lens, so the pressure of the shielding gas cannot be ignored. Tooling fixtures are also an important factor affecting the quality of the cladding layer. In the laser cladding process, the tooling fixture must ensure that the exhaust valve can rotate at a constant speed, so that the scanning speed is constant. The beam irradiation position coincides with the slotting position, otherwise, the cladding layer will deviate and cause 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 1mm~2mm, and the alloy powder and adhesive blending ratio is 2%, which can be more ideal The surface quality of the laser cladding layer.
  • (2) The best process parameters for laser cladding of automobile exhaust valves are: laser power 1.8kW~2.1kW, spot diameter 4.5mm~5mm, scanning speed 5mm/s~6mm/s. The cladding layer is continuous, flat and smooth. , Basically no pores, stable process, can be used in industrial production.

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