摘要
根据激光深熔焊存在小孔现象的特点,利用符合小孔形貌特点的高斯旋转曲面体热源进行加载,得到了随激光工艺参数改变而变化的小孔形貌。建立符合小孔尺寸的微米级精细计算模型,分析随工艺参数变化的激光焊接温度梯度分布特征。通过分析小孔特征尺寸及特征温度梯度,得出对小孔形貌及温度梯度影响最大的工艺参数。研究了小孔形貌特征形成与激光深熔焊温度梯度之间的定性关系。
According to laser deep penetration welding existing the characteristics of keyhole, create a micron-size precise calculation model that coincidence with the keyhole profile,Use keyhole morphology heat source model Gaussian rotating curved body heat source for loading.Obtain the change rule of keyhole profile and temperature gradient with the laser process parameters variety,Through analyzing the feature size and temperature gradient in keyhole to come right the greatest impact parameters for keyhole profile and temperature gradient of laser penetration welding,Analyze the rule of every technological parameters of laser, and gain the best laser parameters value for the keyhole profile and temperature gradient.Study the relationship between keyhole profile and temperature gradient
出处
《电焊机》
2008年第3期26-29,61,共5页
Electric Welding Machine
基金
国家自然科学基金项目(50475093)
关键词
工艺参数州
孔形貌
温度梯度
数值模拟
laser parameter
keyhole profile
temperature gradient
numerical simulation
