Introduction
Ultrasonic aging impact gunIt is an auxiliary equipment that eliminates the internal stress and surface defects of the welding toe caused by the welding process, prevents the deformation or cracking of the workpiece caused by stress release, and can inhibit the initiation of cracks, improve the yield strength and fatigue life of the weld, and increase the surface hardness.
Principle
The ultrasonic driving power supply is connected with the ultrasonic transducer arranged in the housing through a cable, and the vibration output end of the transducer is connected with the amplitude changing rod, and the end of the luffing rod is equipped with an impact pin. The ultrasonic driving power supply converts the mains power into high-frequency and high-voltage alternating current, which is transmitted to the ultrasonic transducer, and then the ultrasonic transducer converts the input electrical energy into mechanical energy, that is, ultrasonic, which is manifested in the form of the transducer in the longitudinal reciprocating telescopic motion, the frequency of the telescopic movement is equivalent to the frequency of the alternating current of the driving power supply, and the displacement of the telescopic is about ten microns. The function of the luffing rod is to amplify the output amplitude of the transducer to reach more than 100 microns, and on the other hand, the impact needle exerts impact force to push the impact needle forward at high speed. After the impact needle hits the workpiece, the energy is transferred to the weld to eliminate the internal stress. The impact head rebounds after being reacted by the workpiece, and after hitting the high-frequency vibration luffing rod, it is excited again, and hits the weld at high speed again, and so on many times to complete the impact operation.
Effect, effect
1. Ultrasonic aging treatment can significantly improve the fatigue life and fatigue strength of welded joints. After welding, the welding toe part is treated to make a smooth transition, so as to reduce the stress concentration caused by the residual height, eliminate the defects on the surface of the welding toe, and at the same time produce a large compressive plastic deformation at the welding toe, generate residual compressive stress, adjust the welding residual stress field, and strengthen and harden the welding toe part.
2. As a post-welding treatment equipment, the ultrasonic impact equipment device can improve multiple factors that affect the quality of the weld at the same time, such as stress, defects, welding toe geometry, surface strengthening and other aspects, so it has the effect of improving the fatigue performance of the welded joint, which can increase the fatigue strength of the treated welded joint by 50%-120% and extend the fatigue life by 5-100 times.
3. Due to the use of processing gun equipment, the traditional grinding and slag removal process is omitted, which can save 20% of labor time, reduce labor intensity and improve production efficiency.
Applications
1. Strengthen the surface of metal parts to improve the surface quality and fatigue life of parts.
2. Adjust the stress field, reduce welding deformation, and ensure the dimensional stability of the workpiece.
3. Eliminate welding stress on the local welding repair parts of mechanical parts. At present, this method has been widely used in foreign machinery manufacturing engineering, especially in welded structures with high requirements for fatigue performance and requirements for eliminating residual stress.
4. Improving the factors affecting the fatigue performance of welds, such as residual stress, microscopic cracks and defects, toe geometry, surface strengthening, etc., is an effective method to improve the fatigue performance of welds.