METHOD FOR LASER PROCESSING OF METAL MATERIALS Russian patent published in 2023 - IPC B23K26/03 B23K26/62 

FIELD: laser technology.

SUBSTANCE: invention relates to a method for laser processing of metal materials and can be used in laser fusion of metal materials with real-time control of thermal processes, including additive manufacturing. Previously, based on the initial data, including the melt temperature of a specific metal material, the diameter and speed of movement of the laser beam, the range of permissible values of the power density and the corresponding range of permissible voltage values containing the normalized voltage corresponding to the calculated power are determined. The dependence between the voltage values from the range of permissible values and the intensity of optical radiation from the melt bath in the ultraviolet part of the spectrum, which is used as a parameter of laser processing, is empirically determined. Then, a local section of the metal material is heated with a laser beam and, when forming a melt bath with an optical radiation receiver, as which a photoelectric receiver is used, the intensity of optical radiation from the melt bath is recorded in the ultraviolet part of the spectrum. Based on the previously determined dependence, the obtained values are converted into the corresponding actual voltage values. If the actual voltage does not fall within the range of acceptable values, the analog voltage signal supplied to the analog input of the laser is changed so that the output laser radiation has the calculated power value.

EFFECT: ensuring the possibility of effective and relatively easy-to-implement control of the thermodynamic temperature of the molten metal bath in real time, at which the actual temperature values are as close as possible to the range of permissible values, which contributes to minimizing the uncontrolled temperature stresses in the finished product.

2 cl, 6 dwg, 3 ex