UV radiation stress in welding, Subproject 2 "Biological efficacy of intermittent and pulsed incoherent optical radiation"
In a study performed by the Deutscher Verband für Schweißen (DVS, translating to German Society for Welding) "Macroeconomic and sector value by the production and application of assembling technology in Germany and Europe" concerning the year 2011 a total number of 260,000 German welders and nearly 1.000.000 European welders were estimated. The scientific basis for the biological effect of intermittent and pulsed laser radiation is currently missing. During the process of welding, radiation is highly intermitting; unfortunately, the data base for evaluation of intermitting and pulsed incoherent optical radiation is deficient. The UV radiation exposure limit values laid down by the German occupational health and safety ordinance on artificial optical radiation (OStrV) - result from the biological impact of continuous radiation. The damaging mechanisms are fundamentally different in relation to the time interval of exposure; for short-term exposure this appears to be of thermal impact, for long-term exposure the mechanism is of photochemical nature. The data used for the evaluation of pulsed incoherent optical radiation is data found in studies of laser radiation, without scientific evidence of applicability. Therefore the effects of pulsed intermitting incoherent optical radiation eventually has to be re-evaluated, and the need of a new data source concept has to be employed, if necessary.
Unit 2.2 "Physical Agents"