铝合金激光焊接变形测量

Aluminum Sheet Laser Welding Deformation Measurements

首先从激光焊接铝合金薄板的激光光谱入手，发现波长为600～650nm激光的光强几乎不变，选择了合适的窄带宽滤光片，使得CCD相机采集的整个焊接过程图片光强均一，整个过程不受焊接过程中激光光强的影响．然后在最佳的焊接参数下焊接，用2台CCD相机在脉冲信号下同时进行图像采集，通过匹配计算分析得到板件在整个焊接过程中全场三维变形量、形貌和应变，能够实时地再现变形过程，得到任意时刻的三维上的焊接变形量以及该时刻的形貌及应变．

This paper reveals that the intensity of the light emitted by aluminum sheet laser welding, which possess a wavelength of 600 nm to 650 nm is nearly constant. A suitable narrow bandwidth filter was se- lected to prevent the fluctuation of the light, so that the pictures taken by the CCD camera have a coherent intensity. The images taken by two independent CCD cameras driven by pulsing signal simultaneously could reveal the three-dimensional deformation, morphology and strain of the entire plate which were wel- ded in the optimal welding parameters in real time. This procedure could help study the sheet laser welding deformation clearly, which was significant in the field of control welding distortion.