Abbreviated Journal Title
J. Appl. Phys.
Beam; Physics; Applied
A three-dimensional quasi-steady-state mathematical model is presented for laser heating with a multimode beam. The effects of laser beam scanning direction on the melt pool shape are investigated through the conduction analysis without phase change. The maximum temperature is found to be behind the center of the focal spot due to advection. The isotherms ahead of the focal spot bunch together and spread apart behind the focal spot on the surface of the workpiece due to the same effect. The temperature profile shows four distinct peaks as a result of four intensity peaks. Scanning direction affects the melt pool shape which needs to be considered for high precision cutting applications such as integrated circuit cutting. The melt pool shape is found to be symmetric about the x axis in the x-y plane and z axis in the y-z plane for the scanning angles phi(s)=0 degrees and -90 degrees, however it is asymmetric for other scanning angles.
Journal of Applied Physics
Farooq, K. and Kar, A., "Effects of laser mode and scanning direction on melt pool shape" (1999). Faculty Bibliography 1990s. 2625.