Abstract A novel method for calculating the solidification rate of laser spot weld pool surface is presented. The surface temperature of weld pool during solidification process is measured by a point infrared sensor. Based on the difference in emissivity of the solid-liquid surface, the output data of infrared sensor, which can accurately reveal the liquid-solid transformation, is demonstrated. Therefore the solidification rate at different locations of the molten pool surface is obtained. Experiment result shows that the solidification rate is related to the weld geometry.
[1]Garzon C M,Gomes J,Brandi S D.Proc 7th Int Conf Trends in Welding Research,Materials Park,OH:ASM International,2005:951 [2]David S A,Babu S S,Vitek J M.JOM,2003;55(6):14 [3]Hu B,Richardson I M.Proc 24th Int Congress on Appli- cation of Lasers and Electro-Optics,Orlando,FL:Laser Institute of America,2005:1042 [4]De A,Walsh C A,Maiti S K,Bhadeshia H K D H.Sci Technol Weld Joining,2003;8:391 [5]Liu L M,Chi M S,Huang R S,Song G,Zhou Y.Sci China, 2005;48E:706 [6]Grabas B,Dard-Thuret J,Laurent M,Pelletier J M.Proc 15th Int Congress on Application of Lasers and Electro- Optics.Orlando,FL:Laser Institute of America,1996: 36 [7]Lee M-Y,Kim J-W.Key Eng Mater,2004;270:2308 [8]Li Y H,Sun X G,Yuan G B.Opt Precis Eng,2007;15: 1336 (李云红，孙晓刚，原桂彬．光学精密工程，2007；15：1336) [9]Cui Z S.Temperature Computation and Measurement. Beijing:China Metrology Press,1998:163 (崔志尚．温度计量与测试．北京：中国计量出版社，1998：163)
