What is the high frequency radiation produced by the high frequency welding machine of welded pipe?
Heating is the main physiological function of radio frequency electromagnetic fields. In microwave ovens, this fact is used to heat food. The intensity of radio frequency electromagnetic fields that people normally encounter is much lower than the intensity that can produce a pronounced heating effect. The heating effect of radio frequency electromagnetic wave is the main basis for the establishment of safety standards. Scientists are also studying the possibility of long-term exposure to the threshold that heats the body. So far, the negative health effects of low intensity, prolonged exposure to radio frequency and power frequency electromagnetic fields have not been confirmed, but scientists are also actively studying this area.
A low-frequency magnetic field induces currents in the body. The strength of the current depends on the strength of the external magnetic field. If the current is large enough, it can cause irritation to the nerves and muscles of the human body, or affect other physiological processes.The electric and magnetic fields can induce voltage and current in the body, but even standing directly in the high-voltage wire below the current induced in the body can be compared to the electric shock or other electric effect limit is still very small.
A low-frequency electric field can affect the human body as much as other substances that are affected by charged particles. When the electric field acts on the conductive material, it affects the surface charge distribution. The electric field causes current to flow from the body to the earth.
Even in the absence of an electric field, we also have very weak currents in our bodies that produce chemical reactions as part of normal bodily function. For example, nerves send signals in the form of electrical impulses; most biochemical reactions, including digestion and brain activity, are accompanied by redistribution of charged particles. The electrical activity of the heart is also very active, and doctors can record them with an electrocardiogram.
There is no scientific certification that electromagnetic radiation is harmful to humansExposure to electromagnetic fields is not a new phenomenon. However, in twentieth Century, the growing electricity needs, the rapid development of new technology and social change in the way of creating artificial electromagnetic field more and more sources, exposure to artificial electromagnetic environment is increasing. From the generation and transmission of electricity, household appliances, industrial equipment to telecommunications and broadcasting, whether at home or work, everyone is exposed to a weak electric field and a weak magnetic field that are mixed in a complex manner.
