767260.fig.004a
(a)
767260.fig.004b
(b)
767260.fig.004c
(c)
767260.fig.004d
(d)
Figure 4: Macrographs of the weld seams obtained at different welding speed (fixed welding parameter:  kW). (a) 2 m/min, (b) 3 m/min (c) 4 m/min, (d) and 6 m/min.