4.3.1. Williamsom–Hall plot (W–H plot)
The shift in X-ray diffraction peak position can also occur from
the strain induced in the unit cell. This effect of strain can be investigated
using Williamson–Hall plot. The particle size and strain can
be obtained from the intercept at the Y-axis and the slope, respectively.
Figs. 11 and 12, shows the W–H plot of base metal and weld
region, respectively. From the W–H plot (Fig. 11) that the strain at
the base metal is about 0.00548.
Also, from the W–H plot (Fig. 12) the strain at the weld region
is observed to be about 0.006. The weld region of the sample (20th
trial as per Table 4) is used for this analysis. There is an increase in
the strain in the weld region as compared to that in the base metal.