The first section of hand soldering tools
Any electronic product, from a rectifier composed of several parts to a computer system composed of thousands of components, is composed of basic electronic components and functions, and is connected by a certain process according to the working principle of the circuit. Although there are many connection methods (eg, wrap, crimp, bond, etc.), the most widely used method is soldering.
1. Hand soldering tools
(1) electric iron
(2) chrome frame
figure 1
2. Conditions of soldering
In order to improve the quality of welding, it is necessary to pay attention to the conditions of soldering.
The weldment must be weldable.
The surface of the metal to be welded should be kept clean.
Use a suitable flux.
Have the proper soldering temperature.
Have the right welding time.
Section 2 Solder and Flux
1. Welding material
Any metal or alloy used to fuse two or more metal faces to make them a whole is called solder. The solder mentioned here is only for the solder used for soldering.
Common soldering materials:
Tubular solder wire
Anti-oxidation solder
Silver-containing solder
Solder paste
2. Selection of flux.
During the soldering process, a thin layer of oxide film is generated due to the heating of the metal, which will hinder the solder infiltration, affect the formation of the solder joint alloy, and easily lead to the phenomenon of soldering and false soldering. The use of flux improves weldability. The flux has rosin, rosin solution, solder paste soldering oil, etc., which can be reasonably selected according to different welding objects. Solder paste soldering oil and the like have certain corrosive properties and cannot be used for soldering electronic components and circuit boards. After soldering, the solder paste soldering oil remaining in the soldering station should be wiped clean. Rosin should be used as flux when tinning the component leads. The printed circuit board is coated with a rosin solution, and the components do not need to be soldered when soldered.
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