High power lasers such as CO{sub}2 and YAG laser have been used as flexible and controllable toolfor manufacturing. Welding of thick plate is one of the most expected applications of these lasers,which have extremely high energy density so that high speed and high quality welding with low heataffection and low deformation will be achieved. This article provides the basic phenomena of laserwelding such as cavity formation, the problems of deep penetration welding such as plasmaabsorption and the overview of recent researches in this region. It also provides the overview oflaser-hybrid welding.
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