1, laser input energy density. Methods for adjusting the energy density of laser irradiation:
A, adjust the laser output energy (adjust the excitation voltage)
B, adjust the spot size (adjust the focal length)
C, change spot energy distribution (change the fiber type: peak output type -- a GI type optical fiber, ladder type output - Si type fiber)
D, the width and the wave shape of the pulse
2, material reflectivity
Most metals in the laser irradiation, the majority of the laser energy reflected off, so, the beginning of the welding process, to increase the power of the beam. The two pulse laser seam welding technology, can arc plate to ensure the welding quality of the section consistency through access. When the metal surface starts to melt or evaporated, the reflectivity of the metal surface is rapidly decreased.