期刊
JOURNAL OF LASER APPLICATIONS
卷 29, 期 1, 页码 -出版社
AIP Publishing
DOI: 10.2351/1.4972098
关键词
laser welding; focal position; melt flow; weld pool; in-situ x-ray observation
For keyhole laser welding of tempered steel, we show that the characteristic formation of eddies in the melt flow significantly depends on the focal position. The local melt flow velocities and accelerations were analyzed in-situ by means of x-ray imaging. It was observed that the keyhole geometry as well as the direction of rotation of the eddy close to the weld pool surface changes when the focal-position is shifted by one Rayleigh length. (C) 2016 Laser Institute of America.
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