Soldering Iron Soldering Basics
Soldering iron is an indispensable tool for maintenance, its welding technology is the basis of maintenance work, a good maintenance technicians, only first of all the basic skills of welding solid, only for the maintenance of a good foundation, it is possible to do a good job of maintenance.
(1) external hot soldering iron
Soldering iron head installed in the soldering iron core inside the soldering iron is called external heat type soldering iron. In the home appliance circuit board repair work, the use of 30 ~ 35 W can meet the needs.
(2) Internal heat type soldering iron
Soldering iron core installed in the iron head inside the soldering iron, known as endothermic soldering iron, endothermic soldering iron heat fast, high heat utilization rate. In the PC board card class chip-level maintenance, the selection of 35 ~ 40 W can meet the needs.
(3) Thermostatic soldering iron
In the soldering iron head, equipped with a magnet type of temperature controller, control cuts the power time and realize the control temperature of the soldering iron, known as thermostatic soldering iron.
In the welding integrated circuits, transistors components, the temperature can not be too high, the welding time can not be too long, otherwise it will be due to the temperature is too high to cause damage to the components, and therefore the temperature of the soldering iron to be given to limit. Constant temperature soldering iron is specially designed for this requirement.
(4) Suction tin type soldering iron
Suction soldering iron is a piston type solder absorber and soldering iron into one of the desoldering tools.
1、Solder material
Solder material is made of tin-lead alloy and a certain amount of active flux configured in a certain proportion, generally 63% of tin, lead accounted for 37%, the liquefaction temperature of the solder in the 400 ℃ (750 ″ F) below.
Common solder materials are tin bars, tin ingots, tin wires, tin powder, prefabricated ingots, tin balls and columns, tin paste and several other types of solder, of which the solder wire is mainly used for a variety of electrical and electronic industries, printed circuit boards, microelectronics technology, such as manual welding process, as shown in the figure for the solder wire.
2, flux
Flux is mainly used to remove the oxidized layer on the surface of the soldered material, so that the soldered material and the solder is well combined.
Solder must have a completely oxidation-free surface can be combined with the solder, and in the welding, metal once exposed to the air will generate an oxide layer, this oxide layer can not be cleaned with traditional solvents, this time you must rely on the flux and the oxidized layer of the chemical reaction, in order to be removed cleanly.
Common flux mainly inorganic flux, organic acid flux, rosin flux and so on several kinds of flux, including rosin flux in the manual welding is more commonly used.
