The dendrites in the weld zone
are found to be very fine and equiaxed in the weld interior and to
be slightly coarser and columnar at regions adjacent to the weld
line. These differences in dendrite morphology can be seen more
clearly in the higher magnification micrographs shown in
Fig. 14b. Laser spot welds are found to be free from Heat Affected
Zone (HAZ) micro-fissuring. It is observed from the figure that the
HAZ is extremely narrow with no significant grain growth