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Typical alloys are 3–4% silver, 0.5–0.7% copper, and the balance (95%+) tin. [3] For example, the common "SAC305" solder is 3.0% silver and 0.5% copper. Cheaper alternatives with less silver are used in some applications, such as SAC105 and SAC0307 (0.3% silver, 0.7% copper), at the expense of a somewhat higher melting point.
Copper content must be maintained between 0.4–0.85%, e.g. by refilling the bath with Sn 96.5 Ag 3.5 alloy (designated e.g. SN 96 Ce). Nitrogen atmosphere can be used to reduce losses by dross formation. Dull, surface shows formation of dendritic tin crystals. Sn 95.6 Ag 3.5 Cu 0.9: 217: Yes: Yes: Determined by NIST to be truly eutectic. Sn 95 ...
Rosin used as flux for soldering A flux pen used for electronics rework Multicore solder containing flux Wire freshly coated with solder, held above molten rosin flux. In metallurgy, a flux is a chemical reducing agent, flowing agent, or purifying agent. Fluxes may have more than one function at a time.
The paste manufacturer will suggest a suitable reflow temperature profile to suit their individual paste. The main requirement is a gentle rise in temperature to prevent explosive expansion (which can cause "solder balling"), yet activate the flux. Thereafter, the solder melts. The time in this area is known as Time Above Liquidus. A reasonably ...
Ni 50 Pd 36 Cr 10.5 B 3 Si 0.5: Pd–Ni 820/960 ... Suitable for step soldering. The original flux-less alloy, does not need flux. ... [5] – Copper-ABA. 92.75: 2.25 ...
Example of a copper alloy object: a Neo-Sumerian foundation figure of Gudea, circa 2100 BC, made in the lost-wax cast method, overall: 17.5 x 4.5 x 7.3 cm, probably from modern-day Iraq, now in the Cleveland Museum of Art (Cleveland, Ohio, USA) Copper alloys are metal alloys that have copper as their principal component.
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