What should you know before solder?

1. The assembly of printed circuit boards has manual assembly and automatic assembly of machines. The efficiency of machine assembly is high. It has been widely used in electronic assembly.

2. Static electricity is a natural physical phenomenon, the more dry the climate, the more easy to produce static electricity, the human body can reach thousands of volts of static electricity. When the human body contacts the CMOS device, it is very easy to cause damage to the components, so when the electronic assembly, it is necessary to do a good job of static protection. Antistatic materials commonly used in electronic factories include antistatic clothing, shoes and hats, gloves, finger rings, electrostatic rings, and electrostatic conveyance.

3. Electronic components should be screened for components before inserting. The components of the components are shaped by hand and mechanical plastic. The components are fitted with vertical inserts, horizontal inserts and mixed intercalation.

4.The welding materials include solder, flux, resistance flux, common solder is eutectic soldering, the commonly used flux has alcohol rosin and rosin flux, there are many kinds of electric soldering iron, and the welding printed circuit board usually selects the internal heat soldering iron with power of 20~45W.

5. The welding process of the electric soldering iron is composed of 5 steps, namely, reverse grip, positive grip and grip, and the welding process is composed of 5 steps: preparation, heating welding, soldering tin, removing soldering tin and removing soldering iron. There are three forms of welding of wires and terminals, that is, welding, hook welding and butt welding.

6. The welding sequence of printed circuit board is resistor, capacitor, diode, triode, integrated circuit, high power pipe and so on. Welding method should be paid attention to welding, and welding should be controlled at the same time to prevent copper foil from rising.

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