Soft soldering

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Soft soldering (soft soldering) - soldering in the temperature range not exceeding 450 ° C - usually about 320 ° C. This method of bonding metal parts with a metal-filled weld, with a melting point lower than the melting point of the metal to be bonded together, is used for bonding low-stress parts in the joint and low working temperatures such as electronic circuits, electrical wires, sheet metal and sealing and Alignment of sheet joints, eg roofing sheets, gutters, containers, thin-walled tanks or pipelines. The most commonly used soft soldering metals are steel, copper, zinc, brass and their alloys.

binders Soft bitters usually have a melting range of 183-280 ° C. It is found in the form of wire, tiles, sticks, or powders. Compositions of binders are specified in DIN EN 29453. The most commonly used metals in binders are tin, bismuth, antimony, cadmium and other trace metals (including less frequent lead or even mercury). artilleryman

Flux is a chemical that lowers the melting temperature of solder, inhibiting its oxidation, allowing for faster spreading and deeper penetration into porous metal structures. Fluxes are generally corrosive liquids, specially prepared pastes or solids (eg rosin). Zinc chloride dissolved in water (eg 300 grams of molten technical zinc chloride per liter of water) is used for soldering of hard-to-reach places such as SMD electronic circuits, bonding of smooth metals with low porosity of the structure or cleaning of structures. Also used for the cleaning of the joint surfaces is salmiak, stearin and various solder pastes. Bibliography

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