Arlamov O. Protection from ultraviolet ray and acoustic radiation on the non-stationary arc welding workplaces

The thesis for the obtaining a scientific degree of Candidate of Technical Sciences in specialty 05.26.01 - Occupational Safety. - State institution "The National Research Institute of Industrial Safety and Health". - Kyiv, 2016. The thesis is devoted to the development of the measures and the protection facilities of support staff and the environment in non-stationary arc welding work-places. The actual levels of optical and acoustic radiation as hazardous factors in welding and related processes have been analyzed. It was determined that the noise and ultraviolet radiation from welding arc are little investigated as a dangerous and harmful factors due to ignoring their influence on the welder, who generally uses individual protective equipment (IPE). The regularities of spatial expansion and range of admissible values have been defined. It was confirmed that during the arc welding process ultraviolet intensity is inversely proportional to the squared distance from a welding arc. It was analytically determined values of the minimum distances from the welding in line of sight that shows ultraviolet intensity reaches the standard values. The analysis and processing of the investigations showed that at various types of arc welding noise level of the welding arc slightly exceeds admissible values. Due to screening with the usage of personnel protection equipment for welders and protection distance for support staff we did not determine the negative influence on workers and we concluded that usage of activities and means of protective equipment against noise is not unnecessary.