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    How to connect metal leads with solder wire lead free?


    Solder is a metal or mixture of metals common in soldering to connect parts. Typically, tin, copper and nickel base alloys are common. Tin-based solder belongs to the group of low-melting solders. And the melting point of the solder does not exceed 450 ° C here. These compounds are widely common for working with radio equipment. Solders based on kester solder wire lead free are very common.

    solder wire lead free

    The motherboard of a computer contains many copper conductors, printed on its surface, which provide the necessary connections. It is copper that is common as a material with high electrical and thermal conductivity. By the way, the old soldering irons had a copper tip.


    RoHS badgeSolders that are common to install motherboards and other computer components are soft. It should be said that in recent years they have switched to lead-free solders. Environmentalists believe that lead is harmful to the environment. Therefore, the Rosh directive was adopted, regulating, in particular, the use of lead-free solders.


    Devices installed in accordance with this directive are easy to distinguish by their lighter and brighter ration spots. Such kester solder wire lead free is the most often more refractory; therefore, when repairing them, not every soldering iron can be common. Such solders together with tin can contain zinc, copper, silver and other metals.


    Electronic components are quite sensitive to overheating. Therefore, when repairing devices made using RoHS technology, it is necessary to monitor the temperature of the soldering iron tip in order to prevent overheating. There is a version that the introduction of lead-free solders was cacommon not only by concern for the environment.

    There was also a desire to profit from the sale of new soldering kester solder wire lead free, which more accurately controls the temperature at the soldering point.


    When soldering, not only solder is common, but also flux. Flux is an organic or inorganic substance that aids in the soldering process. Many metals oxidize when heated. At the same time, a film of oxides (metal-oxygen compounds) appears on their surface, which is not wetted with solder. It has a much poorer thermal conductivity. In addition, the oxide film has a much higher resistance than metal.

    How to connect metal leads with solder wire lead free?

    On the one hand, in order to connect the metal leads of the parts with molten solder, they must be heated. On the other hand, when heated, the metal becomes covered with an oxide film. Many have seen that the copper tip of a working soldering iron is black. This is copper oxide.

    We need flux to prevent the appearance of such films on the surface of the heated kester solder wire lead free. Reactive fluxes can even dissolve films on the surface of solder-wetted parts. When installing electronic devices, active fluxes are common to a limited extent, since they require careful cleaning. Otherwise, flux residues will gradually destroy the soldered joint.


    Most fluxes include rosin, a derivative of pine resinous secretions. It is a solid translucent substance that crumbles easily. Moreover, it is common, in particular, for rubbing the bows of musical instruments. It is a mixture of solid resin acids and their isomers. The lighter the rosin, the few impurities it contains. A solution of rosin in ethyl alcohol is more active than just lump rosin.

    How to prepare liquid flux?

    To prepare a liquid flux, dissolve 1 part of rosin in 5-6 parts of ethyl 96% alcohol. This flux is generally neutral. It is convenient to supply flux to the place of soldering by means of a medical 5-10 cc syringe. There are many different types of fluxes for a wide variety of kester solder wire lead free.


    There are fluxes based on so-called fatty acids and rosin. Glycerin and other substances are easy to add to the composition. Finishing the first part, let's say that the solder is produced in the form of rods of various diameters or in the form of a wire twisted into a coil. Sometimes such a rod or wire contains a rosin core. This is convenient in some cases. But for repair work, it is better to have a rosin-free solder.

    To assemble self-made devices of the simplest design, the most common POS-61 solder or kester solder wire lead free. The alloy is easy to subtract from an old printed circuit board from an electronic device and assembled with a soldering iron from the soldered contacts.

    Types and characteristics of solders

    They are soft and hard. For the installation of radio equipment, low-melting, with a melting point of 300-450 ° C, are common. Soft solders are inferior in strength to hard solders, although they are common to assemble electrical appliances. Low-melting alloys are usually an alloy of lead and tin mainly. There are few alloying elements. Impurities of other metals are introduced to obtain certain characteristics:

    • plasticity;
    • melting point;
    • strength;
    • corrosion resistancesolder wire lead free 2021


    The number in the designation of the brand indicates how many percent of the tin kester solder wire lead free contains. So, the POS-40 solder has technical characteristics such that it contains 40% Sn, and POS-60 - 60%. If the brand is unknown, the composition is easy to estimate by indirect signs: These alloys include the following:

    • POS-90 contains: Common for the repair of medical equipment and food utensils. There is little toxic lead, as it cannot come into contact with food and water.
    • POS-40:. It is mainly common for soldering electrical equipment and products made of galvanized iron, it is also common to repair radiators, brass and copper pipelines.
    • POS-30: It is common in the cable industry, for soldering and tinning, and for zinc sheets.
    • POS-61:. As with POS-60. There isn't much difference.

    The solder alloy (Tin): kester solder wire lead free

    The kester solder wire lead free solder is a mixture (alloy) of different metals. Since tin (Sn) is the main component of soldering, the name tin has established itself. Other materials that are added to the alloy in different amounts are:

    1. lead (Pb)
    2. copper (Cu)
    3. silver (Ag),
    4. gold (Au)

    Depending on the addition and mixing ratio, the properties of the weld change. In this way it can be optimally easy to carry to different welding requirements.

    The main task of the solder tin is to fill the space between the pieces to be soldered. In addition, it must create both a mechanical and an electrically conductive connection.

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