中国有色金属学报（英文版）
中國有色金屬學報（英文版）
중국유색금속학보（영문판）
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
2012年
7期
1701-1710
,共10页
激光焊接%能量耦合模型%“三明治”方法%小孔
激光銲接%能量耦閤模型%“三明治”方法%小孔
격광한접%능량우합모형%“삼명치”방법%소공
laser welding%mathematical energy coupling model%"sandwich" method%keyhole
建立激光与能量耦合模型以研究激光在小孔内的传输和孔壁能量的分布.该模型的主要特点包括:1)小孔和孔内等离子体的逆韧致吸收系数均为实验测量所得；2)入射激光为高斯分布的聚焦光束而非平行光束；3)同时考虑了激光光束在孔内多次反射的菲涅尔吸收和逆韧致吸收.计算结果表明:孔壁所吸收的激光能量并不一致；尽管激光未能直接照射孔底,但是小孔孔底所吸收的激光能量最多.基于聚焦光束的特征分析,焦平面的位置对小孔前沿所吸收的激光能量较后沿更重要.
建立激光與能量耦閤模型以研究激光在小孔內的傳輸和孔壁能量的分佈.該模型的主要特點包括:1)小孔和孔內等離子體的逆韌緻吸收繫數均為實驗測量所得；2)入射激光為高斯分佈的聚焦光束而非平行光束；3)同時攷慮瞭激光光束在孔內多次反射的菲涅爾吸收和逆韌緻吸收.計算結果錶明:孔壁所吸收的激光能量併不一緻；儘管激光未能直接照射孔底,但是小孔孔底所吸收的激光能量最多.基于聚焦光束的特徵分析,焦平麵的位置對小孔前沿所吸收的激光能量較後沿更重要.
건립격광여능량우합모형이연구격광재소공내적전수화공벽능량적분포.해모형적주요특점포괄:1)소공화공내등리자체적역인치흡수계수균위실험측량소득；2)입사격광위고사분포적취초광속이비평행광속；3)동시고필료격광광속재공내다차반사적비열이흡수화역인치흡수.계산결과표명:공벽소흡수적격광능량병불일치；진관격광미능직접조사공저,단시소공공저소흡수적격광능량최다.기우취초광속적특정분석,초평면적위치대소공전연소흡수적격광능량교후연경중요.
A mathematical energy coupling model was developed to analyze the light transmission in the keyhole and energy distribution on the keyhole wall.The 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 considered.The calculation results show that the distribution of absorbed laser intensity by the keyhole wall is not uniform.The maximum laser energy is absorbed by the bottom of the keyhole,although no rays irradiate directly onto the bottom.According 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.
