In laser welding of metallic workpieces, the energetic beam is moved over the workpiece surface to form a pool of molten weld metal that quickly solidifies behind the advance of the laser into a weld nugget. The laser beam produces a keyhole of plasma-containing vapor within the molten pool. Weld nugget porosity, due to entrapment of the vapor, is minimized by continually sensing radiation from the molten metal pool to determine pool depth and width and then controlling laser power and speed to continually produce a weld metal pool wide enough for the liquid to fully expel the vapor and solidify into a pore free nugget.
Y. Huang et al., "Laser Welding Control," U.S. Patents, Jan 2004.
Mechanical and Aerospace Engineering
Patent Application Number
© 2004 Motors Liquidation Co., All rights reserved.
01 Jan 2004