Welding and soldering discharges dust and fumes which even the most advanced production technologies cannot prevent. Collection, extraction, and separation are generally required for manufacturing, product-specific labor, and environmental protection reasons.

The handling of welding fumes is frequently made more problematic by the fact that they may present a health hazard, be toxic, or even carcinogenic. When welding stainless steel (CrNi-steel) in particular, local laws must be observed regarding clean air recirculation.

Gaseous matter might be adhesive or odorous during soldering processes.