What operation is known to be hazardous to hearing capacity?

The operation known to be hazardous to hearing capacity in the context of aerospace materials and processes is welding. Welding often involves the use of high-decibel equipment and generates significant noise from the welding arcs, equipment operation, and possibly surrounding machinery. Prolonged exposure to this level of noise can lead to hearing loss, making it essential for workers in this environment to utilize appropriate hearing protection.

While painting, hand filing, and cleaning can involve some noise, they typically do not reach the decibel levels associated with welding operations. Therefore, understanding the risks related to different processes helps in implementing safety measures and protective equipment to ensure worker safety in environments where high noise levels are present.