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- W2896540122 abstract "The characteristics of audio frequency (20Hz to 20kHz) airborne acoustic wave emission during laser welding processes are well documented. These low frequency oscillations were found to be the principal cause for the formation of surface rippling in welds. The previous studies have identified a number of possible airborne audio frequency emission mechanisms which include a) the break down of equilibrium between the plasma/vapour recoil pressure and surface tension force, b) standing thermo-capillary waves generated by temperature gradients in the weld pool, and c) thermal runaway instability of keyhole at high welding speeds. These theories cannot explain the observed airborne acoustic waves in the ultrasonic range, i.e. above 50kHz. This paper reports an attempt to understand the mechanism of airborne ultrasonic wave emission during laser welding. In this study the keyhole is modelled as a jet nozzle ejecting a stream of vapour into the air. Such an expulsion of materials and energy causes ultrasonic waves in the air nearby. The characteristic frequency and amplitude of the acoustic waves are related to the keyhole and plasma/plume properties as well as laser welding parameters. The theory is used to explain the observed resonant frequencies between 100kHz to 500kHz during CO2 laser beam welding of steels.The characteristics of audio frequency (20Hz to 20kHz) airborne acoustic wave emission during laser welding processes are well documented. These low frequency oscillations were found to be the principal cause for the formation of surface rippling in welds. The previous studies have identified a number of possible airborne audio frequency emission mechanisms which include a) the break down of equilibrium between the plasma/vapour recoil pressure and surface tension force, b) standing thermo-capillary waves generated by temperature gradients in the weld pool, and c) thermal runaway instability of keyhole at high welding speeds. These theories cannot explain the observed airborne acoustic waves in the ultrasonic range, i.e. above 50kHz. This paper reports an attempt to understand the mechanism of airborne ultrasonic wave emission during laser welding. In this study the keyhole is modelled as a jet nozzle ejecting a stream of vapour into the air. Such an expulsion of materials and energy causes ultrasonic wav..." @default.
- W2896540122 created "2018-10-26" @default.
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- W2896540122 date "1998-01-01" @default.
- W2896540122 modified "2023-09-22" @default.
- W2896540122 title "On the mechanism of airborne ultrasonic wave emission in laser welding" @default.
- W2896540122 doi "https://doi.org/10.2351/1.5059195" @default.
- W2896540122 hasPublicationYear "1998" @default.
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