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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.
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.
Sn 96.5 Ag 3.5: 221 [11] Yes: Yes: Sn 96, Sn 96.5, 96S. Fine lamellar structure of densely distributed Ag 3 Sn. Annealing at 125 °C coarsens the structure and softens the solder. [51] Creeps via dislocation climb as a result of lattice diffusion. [72] Used as wire for hand soldering rework; compatible with SnCu 0.7, SnAg 3 Cu 0.5, SnAg 3.9 Cu ...
Wave soldering uses surface tension to keep solder from bridging the insulating gaps between the copper lines of flux-coated printed wiring boards/printed circuit boards. The electric soldering iron is widely used for hand-soldering, consisting of a heating element in contact with the "iron" (a larger mass of metal, usually copper) which is in ...
Both quantitative and qualitative tests for solderability exist. [6] The two most common testing methods are the 'dip and look' method and wetting balance analysis.In both of these tests, the soldered pieces undergo an accelerated aging process before being tested for solderability, to take into consideration the time a component was in storage prior to mounting to final assembly.
[3] A large copper block was required in order to have sufficient thermal capacity to provide useful heat after removal from the fire, and copper is expensive. This led to the development of soldering irons that had a small copper tip attached to an inexpensive cast-iron block. [4] Some irons even had removable and replaceable copper tips. [5]
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