Does The Ultrasonic Welding Machine Have Radiation?
Ultrasound itself has no radiation, it has good direction, strong penetrating power, can obtain relatively concentrated sound energy, and can travel far in water. Usually use the welding machine, you need to wear earplugs, otherwise working for a long time will affect your hearing.
For industrial ultrasonics, such as ultrasonic welding and ultrasonic cleaning, it is also necessary to combine the ultrasonic frequency and sound intensity. In many occasions, the exposure time and the coupling of the medium should also be considered (for example, if the human and the sound source have water, the ultrasonic sound intensity will be dangerous). In a word, low-frequency ultrasound (about 20kHz) needs to be protected by earmuffs. Although it is theoretically harmless, it sounds annoying.
There are no definite reports that airborne ultrasound can cause hearing damage, but there are some subjective discomforts such as headaches and ear discomfort. Even so, the subharmonics caused by ultrasound can still cause hearing damage at sufficient sound intensity.
Therefore, the industry now has clear standards to limit the intensity of ultrasound. Compared with high-frequency ultrasound, the intensity of low-frequency (about 20kHz) ultrasound is more stringent, because some people may still hear the sound of this frequency. The most lenient standard now was revised by the American Government Industrial Health Association in the early 2000s. For 20kHz ultrasound, the maximum allowable sound intensity is 135dB, and in the case of 8 hours of exposure, only 94dB of sound intensity is allowed. For high-frequency ultrasound, this standard will be appropriately relaxed, and if there is liquid coupling between the human and the sound source, it must be reduced by 30dB in this standard.
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