Numerical Calculation Method for Laser Ablation with Beam Subdivision and Diffuse Reflection of Phase Interface

Abstract

The invention discloses a calculation method of laser beam propagation path, laser beam phase boundary reflection (refraction) and laser beam energy absorption in a laser ablation and welding process. A general purpose computation hydromechanics program Fluent is subjected to secondary development through a UDF; the method comprises the steps that 1 the laser propagation path in the laser ablation and welding process is calculated; 2 light reflection and refraction boundaries are automatically calculated according to material attributes on the laser propagation path; 3 through laser subdivision, the diffuse reflection phenomenon can be considered in the welding process, and the diffuse reflection phenomenon comprises the diffuse reflection in a molten pool; 4 according to material attributes of the laser propagation path, the energy absorptivity is automatically calculated; 5 a power source item of a fluid dynamics function is used so that simulation of laser heating in the laser welding process can be achieved. The calculation method is used for calculating the propagation path and energy absorptivity of the light beam in the laser ablation and welding process, and the absorption, reflection, refraction, and diffuse reflection process of the light beam in the materials of any component can be considered. The calculation method is combined with the general purpose computation hydromechanics software fluent and is an effective method for studying the laser ablation and welding mechanism.

Description

technical field [0001] The invention relates to the field of laser ablation and welding, and relates to a numerical calculation method for analyzing laser energy absorption and laser diffuse reflection in the laser ablation process based on beam subdivision and phase interface reflection. Background technique [0002] Laser drilling and welding are important processing methods in modern industry. The physical phenomena in the process of laser drilling and welding are complicated. There are mutual transformations between metal solid, liquid and gas phases, there is flow of liquid and gas phases, and there is mutual drag and transmission between air (shielding gas) and metal solid, liquid and gas phases. Heat, there is gas phase injection and recoil pressure, there is splashed molten metal and recooling and nodulation of the gas phase. All of these have uncertain effects on the quality of laser drilling and welding, so it is of great significance to study the flow process and...

AI Technical Summary

Problems solved by technology

However, the traditional surface heat source model, volume heat source model, and laser welding molten pool flow theory are difficult to fully explain various complex physical phenomena in the welding process, and cannot reflect the incident and diffuse reflection behavior of laser light, and cannot be used to study the laser heating process. The formation process of holes, let alone the flow mechanism during laser heating process, can not be discussed

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