The power output capability of the CW Nd:YAG laser has made rapid increases recently. This laser format allows the power to be easily scaled. The beam quality of this laser format also allows for beam delivery by fiber optic cable. The welding performance of this laser type is useful and productive for industrial applications. The welding capability of a CW Nd:YAG laser will be examined in the power levels above 2 KW on low carbon and stainless steel. This will allow comparison to the efficiency and capability of the lasers available to industry for welding.