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Ultrasonic Impact Treatment Solder For Metal Welding Ultrasound Impact Gun

Views:16     Author:Site Editor     Publish Time: 2019-07-22      Origin:Site

Ultrasonic Impact Treatment Solder For Metal Welding Ultrasound Impact Gun

 

The principle of ultrasonic impact gun to improve the fatigue performance of welded joints Ultrasonic impact gun is to use high-power ultrasonic to push the impact tool to impact the surface of metal objects at a frequency of more than 20,000 times per second. Due to the high frequency, high efficiency of ultrasonic waves and large energy under focusing, The metal surface layer is subjected to large compressive plastic deformation; at the same time, the ultrasonic shock wave changes the original stress field, and a certain value of compressive stress is generated; the ultrasonic impact portion 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, widely used, energy-saving, and low cost.

Efficacy: 1. Residual stretching in the surface layer of metal welds The stress becomes a compressive stress, which greatly increases the fatigue life of the metal structure. 2. The metal grain structure in the surface layer is changed to produce a plastic deformation layer, so that the strength and hardness of the metal surface layer are significantly improved. 3. Improve the geometry of the weld toe and reduce stress concentration. 4. Change the welding stress field, significantly reduce the welding deformation and improve the dimensional stability of the workpiece.

 

 Ultrasonic impact treatment

The purpose of the ultrasonic impact gun is to provide an impact device with high impact force and high impact frequency for the deficiencies of the ordinary mechanical impact device.

 

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 with the horn, and the end of the horn is provided with an impact pin, and a certain buffer space is left in the middle.

 

The ultrasonic drive power source converts the commercial power into a high-frequency high-voltage alternating current and transmits it to the ultrasonic transducer. The ultrasonic transducer then uses the negative piezoelectric effect of the piezoelectric ceramic to convert the input electrical energy into mechanical energy, ie, 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 equivalent to the alternating current of the driving power source. The frequency, the displacement of the telescopic force is about ten micrometers. The role of the horn is to amplify the output amplitude of the transducer. On the one hand, the horn enlarges the amplitude to more than 100 microns, and on the other hand, applies an impact force to the impact needle to push the impact needle to perform a high-speed reciprocating motion. After the impact head impacts the workpiece, the speed is reduced from no less than 1.5 m/s to 0 m/s in a short period of time, and energy is transmitted to the weld to eliminate the 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.

 

Impact gun advantages and application areas:

 

It can be applied not only to the manufacturing process of welded structures, but also to the installation site. It has high workpiece efficiency, good energy saving and fast processing speed. It can process nearly half a meter of welds per minute, not only for butt joints of flat plates. And it is convenient to handle pipe joints that are difficult to handle by other methods. This method has good working conditions, only a few kilograms of actuators, and the weight of the whole machine is not large. It can be easily applied to bridges, oil platforms, ships, airplanes, rolling stock, pressure vessels and pipelines, field construction and high altitude. On-site work.

 

The frequency of the high-power ultrasonic vibration system is generally above 10 kHz, and the frequency of the excitation force of the impact head is also above 10 kHz, and the most commonly used is 15 to 20 kHz. At the same time, the motion acceleration of the ultrasonic force applying portion can reach 3×104 m/s 2 or more. According to the mechanical formula F=ma, the force applying portion exerts a large driving force on the impact head. Therefore, the ultrasonic impact gun has a large impact force and a high impact frequency, and the weld seam of the large steel structure system has a great advantage in removing the internal stress, and the work can be completed quickly and easily.

 


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