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Ultrasonic Impact Improves Titanium Welding Fatigue Performance

Sep. 28, 2019

Find here details of Titanium Bar on our website. Today we would like to talk about ultrasonic impact improves titanium welding fatigue performance.

Ultrasonic shock (UIT/UP) technology was first proposed in 1972 by the world-famous Paton Welding Institute of Ukraine, and was jointly developed by the Paton Welding Institute and the Russian "Quantum" Institute. It was first used for the reduction welding of former Soviet Navy vessels. Residual stress introduces beneficial compressive stress.

Titanium Bar Gr1

Titanium Bar Gr1

As a Titanium Bar Manufacturer, we know that ultrasonic impact technology is an efficient method to eliminate harmful residual tensile stress on the surface of the component or weld zone and introduce beneficial compressive stress. The ultrasonic impact device uses high-power energy to push the impact head to impact the surface of the metal object at a frequency of about 20,000 times per second. The high-frequency, high-efficiency and large energy under focusing cause large compression plastic deformation of the metal surface layer; The original stress field produces beneficial compressive stress; under high energy impact, the surface temperature of the metal rises rapidly and rapidly cools, so that the surface metal structure of the active zone changes and the impact site is strengthened.

In the field of high-energy ultrasound (HPU), ultrasonic impact technology has become a promising research direction, and its application has extended to various materials, components and welding units. So far, ultrasonic impact technology in Russia, Ukraine, France, Japan, Norway, Sweden, Canada and the United States, railways, marine engineering, automobiles, armored vehicles, heavy construction machinery, mechanical parts, aircraft, bridges, rolling stock , oil pipelines, chemical machinery equipment and many other fields have been applied.

Ultrasonic impact is to use high-power ultrasonic to push the impact tool to impact the surface of the metal object at a frequency of more than 20,000 times per second. Due to the high frequency, high efficiency of the ultrasonic wave and the large energy under the focus, the metal surface layer has a large compressive plastic deformation; At the same time, the ultrasonic shock wave changes the original stress field and produces a certain value of compressive stress; the ultrasonic impact site is strengthened. The ultrasonic driving power source is connected to the ultrasonic transducer disposed in the outer casing through a cable, and the vibration output end of the transducer is connected to the horn, and the end of the horn is provided with an impact pin. The ultrasonic drive power source converts the commercial power into a high-frequency high-voltage alternating current and transmits it to the ultrasonic transducer. Then the ultrasonic transducer converts the input electrical energy into mechanical energy, that is, ultrasonic wave, which is expressed in the form of a reciprocating telescopic motion of the transducer in the longitudinal direction; the frequency of the telescopic motion is equal to the frequency of the alternating current of the driving power source, and the displacement of the telescopic displacement is more than ten About micrometers. The role of the horn is to amplify the output amplitude of the transducer to more than 100 microns. On the other hand, the impact force is applied to the impact needle to push the impact needle at a high speed forward. After the impact needle impacts the workpiece, energy is transferred to the weld to achieve the effect of eliminating internal stress. After the impact head is rebounded by the reaction of the workpiece, after hitting the horn of the high-frequency vibration, it is excited again, and hits the weld seam again at a high speed, so that the impact operation is completed repeatedly. Features: High power, high impact, high reliability, long service life, light weight, portable, easy to operate, well-designed, energy-saving and cost-effective.

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