Terms and Norms on Safety in Welding Part 3

Terms and norms on safety in welding part 3

Preventing the risk of destruction of an electric arc rays. Welding arc is a source of light rays, the brightness of which can cause a burn unprotected eyes when they are irradiated during the 10-15 s. A more prolonged exposure to arc radiation can damage the lens of the eye and vision loss. Ultraviolet radiation causes skin and eye burns, burns like the direct action of bright sunlight, the infrared can cause clouding of the eye lens.

Exposure to radiation is harmful not only to arc welders and assistants for workers and assemblers. To prevent a dangerous eye disease must use safety glasses - the darkest for welders and more light for the workers.

In the breathing zone of welders concentration of these gases can reach (mg / l): N2O5 0,009-0,018; SiF4, HF to 0.004 each, CO to 0.46. When welding ferrous metals and their alloys in the welder's breathing zone can be observed such harmful gaseous compounds such as, ZnO, SnO2, MnO2, SiO2, etc.

The most dangerous to the health of welders aerosols of manganese as manganese poisoning can cause long-term and sustained involvement of the central nervous system up to the paralysis. Acute toxicity of zinc and lead vapor can cause fever, casting, and the poisoning of chromic anhydride - bronchial asthma. Long-term deposition of dust in the lungs can cause pneumonia.

All of these lesions may occur when welding is carried out with a flagrant violation of safety rules and safety relating to the provision of general and local ventilation, use of personal protective equipment (masks, respirators), especially when welding nonferrous metals and their alloys, as well as welding close, closed compartments with poor ventilation, etc.

There are strict requirements for ventilation for welding work. To capture the welding fumes in fixed positions, and where possible, and the time-dependent local pumps should be installed in a fume hood vertical or inclined panels of uniform suction table with suction sublattice, etc. When welding large structures on the conductors of serial, manipulators, and so n . local pumps should be directly embedded in these devices. When the automatic submerged arc welding in shielding gases, electroslag welding device is used with local exhaust of gases.

See also:
Terms and Norms on Safety in Welding Part 1
Terms and Norms on Safety in Welding Part 2
Terms and Norms on Safety in Welding Part 3
Terms and Norms on Safety in Welding Part 4
General Characteristics of the Basic Safety Requirements
Accident Prevention