The pulse width of the welding laser is about milliseconds, a sufficient time for the metal to melt. The width of their spots should be as small as possible so that the delicacy of the work is appropriate. But this spot should not be smaller than a certain limit to avoid the reduction in the strength and durability of the welding laser. Therefore, the light spot of the welding lasers is about 100 to 500 micrometers, depending on their application. While the light spot of the engraving and cutting lasers is between 30 and 80 micrometers.