Fig. 4: The formation of a chevron pattern.
From: High frequency beam oscillation keyhole dynamics in laser melting revealed by in-situ x-ray imaging
The centerline cross-sectional views of a simulated oscillating melt track (400 W laser power and 400 mm s−1 laser scan speed with 0.12 mm circular oscillation diameter) in a show the formation of the surface swelling, which is highlighted in orange and the corresponding top-down views in b show the formation a chevron unit. A comparison in d shows a no-oscillation case with the same laser parameters. The optical image in c provides an example of the chevron pattern on a DXR melt track. The plot in e summarizes the relative positions of the peak of the surface swelling and the melt pool tail with respect to the dashed reference line. (See Supplementary Movie 04).
