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Three dimensional solutions for the heat flow in laser beam
welding with a constant moving Gaussian heat source have
been analyzed. The temperature rise and cooling rate are
related to the beam spot size, travel speed and laser power.
As an application of this model, the theoretical predictors
were compared to the experimental data in which laser
conditions were arranged for carbon and AISI 316 steels as
bead-on-plate welds, using a continuous wave 3kW CO2 laser
with the various travel speed, beam sport size and laser
power. Experimental data show a good agreement with the
theoretical predictions. This analytical model can be used
to determine the maximum possible penetration depth, fusion
boundary, and thermal history for given sources of laser
beam welding conditions.
Keywords:
Laser Beam
Welding, Penetration Depth, Bead Width, Cooling Rate, CO2
Laser, Gaussian Beam
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