Tin selection process

Tin selection refers to the process of coating solder joints on PCB boards during the manufacturing of electronic components to ensure welding quality. The tin selection process is a very important part of the entire PCB manufacturing process, which is related to the quality and service life of the entire electronic components. This article will introduce the detailed steps and precautions of the tin selection process.

1、 Preparation work

1.1 Prepare the solder paste

Tin paste is the main material for selecting tin, and there are generally two types: lead-free solder paste and lead-tin paste. The choice of solder paste should be determined based on actual needs and environmental requirements. The quality of solder paste has a significant impact on the effectiveness of tin selection, so it is necessary to choose high-quality solder paste.

1.2 Prepare the tin selection equipment

Tin selecting equipment includes tin selecting machine, Heat gun, soldering iron, etc. Tin selection machine is an essential equipment in the tin selection process, which can automatically apply solder paste to solder joints. The Heat gun and soldering iron are tools for repairing and soldering during tin selection.

1.3 Prepare the PCB board

Before selecting tin, the PCB board should be cleaned and rust removed to ensure the quality of the solder joints and the effectiveness of tin selection.

2、 Tin selection process

2.1 Adjusting the parameters of the tin selection machine

Before conducting tin selection, it is necessary to adjust the parameters of the tin selection machine, including the thickness, speed, temperature, etc. of the solder paste. Different PCB boards and solder joints require different tin selection parameters, so adjustments should be made according to the actual situation.

2.2 Starting Tin Selection

Place the PCB board on the tin selection machine, start the tin selection machine, and the tin selection machine will automatically apply solder paste to the solder joints. During the process of selecting tin, attention should be paid to the thickness and uniformity of the solder paste to ensure the quality of the solder joints.

2.3 Repair and welding

During the tin selection process, some solder joints may have problems and require repair and repair welding. Repair and repair welding can be carried out with tools such as Heat gun and soldering iron.

3、 Precautions

3.1 Selection of Tin Selection Machine and Tin Selection Parameters

The selection of tin selection machine and parameters should be based on the actual situation, and different PCB boards and solder joints require different tin selection parameters. Choose a tin selection machine with stable performance, simple operation, and good tin selection effect.

3.2 Selection of solder paste

The selection of solder paste should be determined based on actual needs and environmental requirements. Choose high-quality solder paste to ensure the quality and service life of the solder joints.

3.3 Cleaning and rust removal treatment

Before selecting tin, the PCB board should be cleaned and rust removed to ensure the quality of the solder joints and the effectiveness of tin selection.

3.4 Repair and Welding

During the tin selection process, some solder joints may have problems and require repair and soldering. Repair and welding should pay attention to the uniformity and quality of the solder joints to ensure the quality of the entire PCB board.

summary

The tin selection process is a very important part of the entire PCB manufacturing process, which is related to the quality and service life of the entire electronic components. Before conducting tin selection, preparation work should be carried out, including preparing solder paste, tin selection equipment, and PCB board. The tin selection process includes steps such as adjusting the parameters of the tin selection machine, starting tin selection, and conducting repairs and welding repairs. During the tin selection process, attention should be paid to the selection of tin selection machine and parameters, the selection of solder paste, cleaning and rust removal treatment, as well as repair and welding. Only by paying attention to these issues can we ensure the effectiveness of tin selection and the quality of solder joints.