Hot Sale Induction High Frequency Heat Treatment Machine for Braze Welding

Laser quenching process parameters are a key link in laser heat treatment. The process parameters mainly include laser power, laser beam scanning speed, focal length of the focusing mirror, and defocusing amount (distance between the quenched surface and the beam focus). The energy absorbed by the quenched surface depends on the laser power; The action time of the laser beam on the quenched surface depends on the scanning speed; The size of the spot depends on the focal length and defocusing amount of the focusing mirror; The laser power density depends on the laser power and spot size. Generally, an increase in laser power results in an increase in the depth of the quenched layer; The scanning speed increases, and the depth of the quenched layer decreases; As the defocusing amount increases, the size of the light spot increases, and within a certain range, the width of the quenching layer increases.

The metal surface of laser heat treatment is generally processed by mechanical processing, with small surface roughness and high reflectivity to laser. Before laser heat treatment, the quenched surface should be pre treated to improve its absorbance. After oil removal, rust removal, cleaning, and drying of the treated surface, a light absorbing coating (blackening) is pre installed on the surface. The methods include phosphating, spraying (brushing) paint, improving surface roughness, oxidation, coating, etc; The coating should be thin, uniform in thickness, with a high laser absorption rate (over 90%), good thermal conductivity, good adhesion to metal, and not decompose or evaporate at a certain temperature. It is easy to clean and remove after quenching or can be used without removal.