Solders and fluxes. Purpose and definitions. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Electrician

Solders and fluxes. Purpose and definitions. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Electrical materials

For soldering joints of conductive materials, depending on the maximum permissible operating temperatures and the required strength of the solder joint, soft and hard solders.

К soft include solders with a melting point up to 400 ° C, and hard - over 500 °С. Solders with temperatures above the melting point of pure tin in the range up to 400 ° C are called semi-solid.

Soft and semi-hard solders have a tensile strength of up to 50-70 MPa and are used for soldering current-carrying parts that are not at the same time the supporting structures of machines or devices.

Soldering with soft and semi-hard solders It is carried out with a soldering iron or by immersing parts in molten solder, while the surfaces to be joined are pre-tinned, as a rule, with solder of the same brand and usually covered with rosin (flux).

Tin-lead solders produced in the form of ingots, rods, wire, tape and tubes filled with rosin.

Hard solders have a strength limit of up to 500 MPa and are used as solders of the first category of strength when soldering current-carrying parts, high-speed, allowing high heating of electrical machines and parts that perceive the main mechanical load.

Author: Koryakin-Chernyak S.L.

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