Welding fumes are composed of many different substances, many of which are in the nanoparticle range. Yet, how large are such nanoparticles?
In dimensions, the distribution looks as follows:
1 millimeter = 1,000 micrometers
1 micrometer / 1 my = 1,000 nanometers
The following graphic is an illustration example: A fine dust particle has the same ratio to the football as the football has to the earth.
Particles in the micrometer range can not be seen with the naked eye. And this is what makes those finest particles so dangerous - they are practically an invisible Toxin.
Depending on the size of the particles, the substances are divided in individual classes; these range from solids (as of 100 µm or 0.1 mm) and greater) up to gases and vapours (less than 0.01 µm or 0.00001 mm and smaller).
Particles of a size of less than 1 µm are a particular danger as these can enter the avioli; that is they can reach the inside of the lungs and air sacs. Furthermore, they can also reach the brain via the bloodstream and cause brain and nerve damage.
70.3 % of occurring particles in welding fumes are less than 1 µm - hence extraction of these substances is a must.
>> to 1. Welding fumes - What are they?
>> to 2. Composition of welding fumes
>> to 4. Physical effects by absorbing pollutants in welding fumes