摘要
基于小孔前壁演化动力学的分析,考虑激光束强度空间分布及等离子体吸收强度等因素,建立了激光深熔焊熔透深度的预测模型.利用该模型对奥氏体不锈钢Yb光纤激光焊在不同焊接速度下的熔透深度值进行了预测,并与试验结果进行了比较.利用该模型还研究了熔透深度与离焦量的关系.结果表明:利用该模型预测得到的熔透深度值与试验结果吻合较好;熔透深度随负离焦量的增大而增大,随正离焦量的增大而减小.
A prediction model for penetration depth of laser keyhole welding was developed by dynamically analyzing the evolution of front keyhole wall and considering the factors,such as the power density distribution of laser beam and the plasma absorption,etc.,with which the penetration depth of an austenite stainless steel weld joined by Yb fiber laser was predicted for different welding velocities,and subsequently a comparison was made between the predicted values and experimental measurements.The model was further used to study the relationship between the penetration depth and the defocusing distance.Results show that the penetration depth predicted by the model agrees well with that of actual measurement,which increases with rising negative defocusing distance and reducing positive defocusing distance.
出处
《动力工程学报》
CAS
CSCD
北大核心
2014年第6期495-500,共6页
Journal of Chinese Society of Power Engineering
基金
国家科技重大专项基金资助项目(2011ZX06004-016)
关键词
激光深熔焊
熔透深度
小孔
离焦量
预测模型
laser keyhole welding
penetration depth
keyhole
defocusing distance
prediction model
