Abstract
This paper reports the results of statistical analysis
conducted on the weld data obtained from friction stir welding of
aluminium and copper. The welds were produced by varying the
process parameters; the rotational speed was varied between 600
to 1200 rpm and the welding speed varied between 50 and 300
mm/min. The Statistica (version 9.0) statistical analysis software
package was used to generate the scatter and surface plots
relative to the experimental results obtained from the tensile
testing and the FSW data. Regression analysis was also done on
the weld data. It was found that the downward vertical force has
a significant effect on the Ultimate Tensile Strength of the weld
and a strong relationship exist between the heat input into the
welds and the measured electrical resistivities of the welds.