After soldering, the soldered joint should be encouraged to cool as rapidly as possible without cooling so quickly as to warp. Non-corrosive, rosin-based flux residues do not need to be removed after soldering. Zinc chloride fluxes can be removed by flushing with a 2% hydochlorie acid solution, then with hot water containing some sodium carbonate, then with clean water.
Less important to remember that all soldering fluxes give off fumes and smoke when heat is applied, and these may he toxic. Metals such as cadmium, lead, zinc and their oxides may also be toxic when present in the atmosphere as fumes or dust. Therefore, adequate ventilation is imperative when soldering; any metal. Soldering fluxes containing zinc chloride may produce severe burns and dermatitis if allowed to remain on the skin for any period of time. Two typical solder joints related to flashing are the lap seam and the lock seam below. The lap seam can he joined with rivets of a compatible metal before soldering.
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