The Principle Of Ultrasonic Aging Impact Gun

The principle of ultrasonic aging impact gun to improve the fatigue performance of welded joints: ultrasonic impact is to use high-power ultrasonic to push impact: Tools impact the metal surface at a frequency of more than 20000 times per second, because of the high-frequency, high-efficiency and focused energy of ultrasonic, the metal surface produces large compressive plastic deformation; we ultrasonic at the same time changes the original ultrasonic impact wave The stress field produced a certain numerical value of compressive stress, which strengthened the ultrasonic impact site.

The 20KHz wave driving power converts the municipal electricity into high frequency and high voltage AC current, which is fed to the ultrasonic transducer. Then the ultrasonic transducer converts the input electric energy into mechanical energy, i.e. ultrasonic wave, in the form of reciprocating and contracting motion of the transducer in the longitudinal direction; the frequency of the contraction motion is equal to the AC current frequency of the driving power supply, and the displacement of the contraction is about ten microns. The function of the horn is to amplify the output amplitude of the transducer to more than 100 μ m, on the other hand, to exert an impact force on the impact pin to push the impact pin forward at high speed. After the impact needle impacts the workpiece, the energy is transferred to the weld to eliminate the internal stress. ultrasonic impact head is rebounded by the reaction of the workpiece. When it meets the horn of high frequency vibration, it is stimulated again. It bumps into the weld again at high speed. So many times, it completes the impact operation.

high-power ultrasonic stress relief can make the residual tensile stress in the surface layer of the metal weld change into compressive stress, thus greatly improving the fatigue life of the metal structure and eliminating the residual stress effect can reach more than 80%; changing the grain structure of the metal in the surface layer to produce plastic deformation layer, so that the strength and hardness of the metal surface layer are remarkable. It can increase the strength by 50-100%, prolong the fatigue life by 5-80 times, improve the geometric shape of weld toes, reduce stress concentration, change the welding stress field, reduce the welding deformation and improve the dimensional stability of the workpiece.

Ultrasound stress relief is mainly used in industries that require stricter stability and strength of welded joints, such as bridges, power, shipbuilding, pressure vessels, steel structures and other industries.