494851.fig.005a
(a) −3 mm
494851.fig.005b
(b) −2 mm
494851.fig.005c
(c) −1 mm
494851.fig.005d
(d) 0 mm
494851.fig.005e
(e) +1 mm
494851.fig.005f
(f) +2 mm
494851.fig.005g
(g) +3 mm
Figure 5: Influence of defocus amount on cross-section morphologies of welded seam. (  W;  m/min; 15 L/min).