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To determine the health and safety program required to protect welder workers, an evaluation of workplace hazards which complies with national, regional or international health and safety regulations (e.g. labour protection law), shall be completed.

Any predominant hazardous substance is called a key component (for a specific combination of process and material). A main component of the welding fume is a component of occupational medical importance, the percentage of which in the welding fume is not predominant, i.e., this component is no key component of the welding fume. Main components shall not be equated with key components.

Despite considerable technical and organisational efforts, full protection from the effects of hazardous substances cannot be attained under today’s operating conditions. Therefore, it is necessary and beyond dispute that, for some operations, necessary technical prevention should be accompanied by preventive occupational medical care. The purpose is avoidance and early detection especially of chronic diseases.