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Ni 81.5 Cr 15 B 3.5: Ni–Cr 1055 [1] – NI 109. Eutectic. <1.5% Fe. Good initial penetration. Specialized use in aerospace. Good choice for gap-filling powders. 15: 81.5: 3.5: Ni 62.5 Cr 11.5 Si 3.5 B 2.5 Fe 3.5 C 0.5 W 16: Ni-Cr-W 970/1105 [1] – NI 110. Moderate flow. Use in aerospace. Almost always requires tracing. Gaps 0.1–0.25 mm. 11 ...
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.
Cu 3 Sn – common on solder-copper interface, forms preferentially when excess of copper is available, more thermally stable than Cu 6 Sn 5, often present when higher-temperature soldering occurred [19] [6] Ni 3 Sn 4 – common on solder-nickel interface [19] [6] FeSn 2 – very slow formation
The three main types of vacuum furnace are: single-wall hot retort, double-walled hot retort, and cold-wall retort. Typical vacuum levels for brazing range from pressures of 1.3 to 0.13 pascals (10 −2 to 10 −3 Torr) to 0.00013 Pa (10 −6 Torr) or lower. [11]
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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