High Speed Real Time Observation on Keyhole Dynamics in Laser Welding.
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概要
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In laser welding, a deep cavity, or a so-called keyhole or beam hole, is formed in the weld pool by the intense recoil pressure of metal evaporation. The keyhole formation is advantageous, on the one hand, because a deep and narrow weld is obtained in laser welding. On the other hand, a hole formed in the liquid pool is by nature very unstable. In high-power keyhole laser welding, quite a large number of characteristic porosities are observed in the weld metal, and this tendency is enhanced at higher power. However, the porosity-formation mechanism has not been clarified at all. The authors have, therefore, conducted a direct observation of keyhole behavior as well as allied phenomena by various optical and X-ray methods. This paper describes methods for observing keyhole dynamics in laser welding with high temporal and spatial resolution as well as observed keyhole behaviors and allied phenomena, mechanisms of porosity formation, and relevant suppression methods.
- 社団法人 レーザー学会の論文
社団法人 レーザー学会 | 論文
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