Eliminate all fire and explosion hazards by cleaning them thoroughly. If surfaces to be welded are prepared with a chlorinated solvent, make sure the surface is thoroughly dry before proceeding with the work. The action of ultraviolet light or heat on the chlorinated solvent may form phosgene which is a very toxic gas. Restrict the use of other halogenated compounds, even though not chlorinated, because they decompose to form acid gases. Gases are generated from heating fluxes and from certain reactions with air.
Dusts come from grinding and machining of metals.
To protect from exposure to these airborne substances, use adequate local exhaust or dilution ventilation. When present, noise exposure may be continuous or intermittent. Use engineering and operational controls as much as possible to control hazards. For hazards which cannot be eliminated in this way, use personal protective equipment. 8.15.4.1 Respiratory Protection Soldering and brazing may produce harmful fumes particularly from lead and cadmium solders.