Determination of energy coupling to material in laser welding by a novel “sandwich” method

作     者：张屹 史如坤 李力钧 ZHANG Yi;SHI Ru-kun;LI Li-jun

作者机构：湖南大学汽车车身先进设计制造国家重点实验室长沙410082 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2012年第22卷第7期

页      面：1701-1710页

核心收录：

学科分类：080503[工学-材料加工工程] 0806[工学-冶金工程] 08[工学] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0813[工学-建筑学] 0802[工学-机械工程] 0814[工学-土木工程] 0702[理学-物理学] 080201[工学-机械制造及其自动化] 

基　　金：Projects (51175162, 50805045) supported by the National Natural Science Foundation of China Project supported by the Scientific Research Foundation for the Returned Overseas Chinese Scholars,Ministry of Education,China 

主　　题：laser welding mathematical energy coupling model "sandwich" method keyhole 

摘      要：A mathematical energy coupling model was developed to analyze the light transmission in the keyhole and energy distribution on the keyhole *** main characteristics of the model include：1） a prototype of the keyhole and the inverse Bremsstrahlung absorption coefficient in the keyhole plasma are obtained from the experiments;2） instead of using a parallel incident beam,a focused laser beam with real Gaussian intensity distribution is implemented;3） both Fresnel absorption and inverse Bremsstrahlung absorption during multiple reflections are *** calculation results show that the distribution of absorbed laser intensity by the keyhole wall is not *** maximum laser energy is absorbed by the bottom of the keyhole,although no rays irradiate directly onto the *** to analysis of beam focusing characteristics,the location of the focal plane plays a more important role in the laser energy absorption by the front wall than by the rear wall.