Informazione tecnica HSE / 25 ° anno
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17 November 2022, Prepared by the European Chemicals Agency
ECHA Scoping Study report for evaluation of limit values for welding fumes and fumes from other processes that generate fume in a similar way at the workplace
Welding and other processes that generate fume in a similar way
Welding is a broad term for the process of joining metals through coalescence. This coalescence is achieved by applying heat (energy) to melt the base metal pieces and fusing
them together to form a secure joint. A filler material (also containing metals) is typically added to the joint during welding to form a pool of molten material, that cools to form a
joint that is usually stronger than the base material. Welding techniques can then be broadly classified in terms of how the heat/energy is applied: gas welding (using fuel
gases), arc welding (using electricity) or beam welding (using laser/electron beams).
Other processes that generate fume in a similar way include soldering (uses lower temperatures, where only the filler melts), thermal cutting or gouging (melting to cut a shape), thermal spraying (melting to deposit a coating), flame straightening (heating not necessarily melting, to remove distortions). Additionally additive manufacturing has been considered in this report due to the metal melting-joining on cooling aspect. However this occurs in an inert atmosphere inside a machine where no exposure to workers can occur.
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