Device and method for measuring velocity of steam plume during laser welding

Abstract

The invention discloses a measuring device for the moving speed of metal vapor plume in the process of laser welding. Including welding laser, walking platform, high-speed photography system, trigger device and computer; high-speed photography system includes high-speed camera, telephoto macro lens, band-pass filter and quartz protective lens; high-speed camera is installed horizontally on a tripod; band-pass filter The optical mirror and quartz protective lens are installed in front of the telephoto macro lens; the high-speed photography system is triggered and collected through the trigger device; the high-speed photography system and the trigger device are set and data saved through the computer. Also disclosed is a method for measuring the moving velocity of the metal vapor plume during the laser welding process. The image information of the shape of the metal vapor plume during the welding process is obtained, and the distribution of the motion velocity within the entire range of the metal vapor plume is obtained through the 2D interpolation method after processing.

Description

technical field [0001] The invention relates to the field of laser welding process measurement and control, in particular to a measuring device and method for moving velocity of steam plume in the laser welding process. Background technique [0002] In laser welding, the behavior of the metal vapor plume is an important feature of the physical process of laser welding. The characteristics of the metal vapor plume reflect the state of evaporation inside the small hole during the laser welding process; the change of the plume characteristics also reflects the stability of the small hole during the laser welding process. In the laser welding process, the change frequency of the metal vapor plume is fast, and its spontaneous radiation intensity is lower than that of the arc plasma radiation intensity in the arc welding process. Limited by the complex working conditions of laser welding, it has always been a difficult point to study the motion characteristics of metal vapor, esp...

AI Technical Summary

Problems solved by technology

[0004] (1) The existing method characterizes the velocity of the metal vapor movement through the change of the length or area of ​​the metal vapor plume, which can only obtain the growth rate of the length or area of ​​the metal vapor plume, and cannot reflect the direction of the metal vapor plume movement;

[0005] (2) Existing methods can only reflect the average rate of change of the metal vapor plume, and cannot measure the velocity distribution of the entire metal vapor plume

Images