soldering iron(redirected from soldering irons)
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(soldering copper), a soldering tool used to heat the parts being joined, melt the solder, and introduce the liquid solder into the gap. The working part of a soldering iron is usually made of copper to maximize heat conductivity. The tip is tapered at an angle of 30° to 40°, and the working edge is rounded. The heating temperature of a soldering iron should stay below 400°C to prevent the tip from dissolving into the liquid solder. The shape, size, and weight of a soldering iron are dictated by the type of joint being soldered and by the configuration and mass of the object. The weight can range from 0.1 kg in irons used to solder electronic components to 5 kg in irons used to solder large objects.
Soldering irons are divided into three groups according to the method of heating: those with no permanent heating, those heated continuously by a flame, and those with electric heating. Household electric soldering irons are classified by the type of heating (continuous, intermittent, forced, and pulsed), the kind of soldering stick, the power rating (from 10 to 250 watts), and the time required for heating to 280°C. Ultrasonic soldering irons are special-purpose irons that use the vibrations of the heated stick to break down the oxide film on the surface of the metal being soldered while the metal is under a layer of molten solder. The principal advantage of ultrasonic soldering irons is that they allow soldering without fluxes; the irons are used chiefly to solder aluminum with solders that have low melting points.
V. P. FROLOV