Laser-acoustic welding of specimens of steel 12cr18n9t

Subject of research: ultrasonic vibrations in the processes of laser welding and surfacing. Purpose of research: the use of ultrasonic vibrations in the processes of laser welding and surfacing. Object of research: the structure and properties of welded joints as a result of the effects of ultrasound on a metal melt. Methods of research: optical and electron microscopy, local elemental analysis, X-ray tomography, and a series of tensile tests were used to study the influence of vibrations on the corresponding processes Main results of research: the possibilities of using ultrasonic vibrations in the processes of laser welding and surfacing are shown. It is shown that ultrasonic vibrations can be used in two ways: ultrasonic operational processing during welding and surfacing and post-processing of the finished weld and deposited metal. Ultrasonic action leads to a decrease in the thickness of the weld and an increase in the depth of penetration and, leads to an increase in the tensile strength of the deposited material up to 1.3 times. It is shown that the effect is due to the formation of oriented thin–lamellar structures on the surface of the samples.