This paper focused on a systemic solution to high power laser welding for high thickness shipbuilding steel. The laser
induced plasma not only absorbs laser energy but also affect welding process stability especially when laser power is
higher than 10 kW. The electron density, electron temperature and plasma height are analyzed in paper with high speed
camera and spectrometer in this paper. Laser Supported Combustion (LSC) result in instable laser welding process and
cause bad seam quality. As an effective method to suppress plasma and keep stable welding process, flow rate of side
blowing gas is analyzed. The relationship between Seam shape, its mechanical properties and welding parameters is
studied. Experiments results showed that High power laser welding is a qualified and efficient method for high thickness
shipbuilding steel.
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