![]() Joint-clearance recommendations are the same as tin-lead solders. Addition of antimony (up to a maximum of 6%) in place of some of the tin improves strength and does not affect wettability or flow characteristics. They are not recommended for use on aluminum, zinc, or galvanized steel. Tin-lead-antimony alloys are used for the same types of applications as tin-lead solders. Where moisture might reach the assembly, 95% zinc/5% aluminum solder should be used. Solders with higher tin contents, such as 70A, can be used for soldering zinc. The 60A solder is particularly suitable for delicate heat-sensitive electronic components. They provide optimum soldering properties and good strength at operating temperatures below 250☏. General-purpose tin-lead solders have classifications 35A through 50A. ![]() The highest-melting-temperature solder in this group, 5A, is suitable where operating temperature of the assembly may reach 300☏. These solders are compatible with all base-metal cleaners, fluxes, and heating methods, and can join most metals. Solder alloys:The largest group of soldering alloys is tin-lead alloys. Efficiency in bringing joint to soldering temperature.Cost of providing the heat to bring an assembly to soldering temperature.Sealing, such as tin-can and radiator seams, is the second most common use.Īutomated soldering equipment produces high-quality joints at a relatively low cost per joint.Ĭonditions for choosing a heating method involve: Molten solder fills the space between surfaces to be joined, adheres to the surfaces, and solidifies.Įlectrical and electronic applications account for much soldering. ![]() Soldering uses alloys that melt below 840☏ to join metals.
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