681910.fig.007a
(a)
681910.fig.007b
(b)
681910.fig.007c
(c)
681910.fig.007d
(d)
Figure 7: Influence of shoulder diameter on (a) weld yield strength, (b) weld Young’s modulus, (c) yield strength to Young’s modulus ratio, and (d) weld strain hardening exponent; RS: rotational speed (in rpm); WS: welding speed (in mm/min).