Analysis method of high frequency electromagnetic field

High-frequency electromagnetic field refers to the frequency of 100kHz ~ 300MHz electromagnetic waves, its wavelength range from 1 ~ 3000m, according to the wavelength can be divided into long-wave, medium-wave, short-wave, ultra-short-wave. High-frequency electromagnetic radiation belongs to non-ionizing radiation in the radio frequency radiation (radio waves). In the non-fusion pole argon arc welding and plasma arc welding and cutting, commonly used high-frequency oscillator to stimulate the arc, some AC argon arc welding machine also uses high-frequency oscillator to stabilize the arc. The human body under the action of high-frequency electromagnetic field, can absorb a certain amount of radiation energy, produce biological effects, mainly thermal effects.

High-frequency electromagnetic field strength is affected by many factors, such as the distance from the oscillator and the oscillation circuit the closer the field strength is higher, and vice versa, the lower. In addition, the degree of shielding of the high-frequency part of the relevant.

The human body in the role of high-frequency electromagnetic fields will produce biological effects, welders long-term exposure to high-frequency electromagnetic fields can cause vegetative nerve dysfunction and neurasthenia. Manifested as general discomfort, dizziness, headache, fatigue, loss of appetite, insomnia and low blood pressure and other symptoms. If only the use of high-frequency oscillator when the lead lone, because of the short time, the impact is small, but long-term exposure is harmful. Therefore, effective protective measures must be taken against high-frequency electromagnetic fields. High-frequency electricity will make the welder produce a certain amount of numbness, which is very dangerous when working at high altitude, so high-frequency oscillator is not allowed to use high-frequency operation.