![]() These solders creep during longtime loading above room temperature. The 50% indium/50% tin alloy is suitable for glass-to-glass and glass-to-metal soldering.įusible alloys are bismuth-containing solders, used where soldering must be done at temperatures below 361☏. Indium solders are used for special applications, such as cryogenic products. A 95% zinc/5% aluminum solder is used without flux for ultrasonic soldering of heat exchangers. They provide high joint strength and good corrosion resistance. Zinc-aluminum solders are specifically designed for soldering aluminum. They are suitable for applications where service temperatures may reach 400☏ or higher. When tin is added, silver content should be limited to 1.5% to avoid segregation.Ĭadmium-zinc solders are used to join aluminum to itself and to other metals. The addition of 1% tin, replacing silver, increases wetting and flow, and reduces susceptibility to corrosion. Lead-silver solders have poor wetting characteristics, however, and corrode in humid atmospheres. Fatigue properties are better than those of nonsilver solder alloys. Lead-silver solders have high tensile, creep, and shear strengths to 350☏. Tin-zinc alloys are used mainly for soldering aluminum - primarily where a low soldering temperature is required. Tin-silver alloys have the same characteristics as tin-antimony solders and are used for delicate instrument work and high-strength applications. It has high strength at temperatures up to 300☏ and provides excellent flow characteristics. Tin-antimony solder (95% tin) has the best electrical properties of any common solder alloy. ![]() 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. ![]()
0 Comments
Leave a Reply. |