Solder pastes are specific paste-like substances that are used to fix parts to a printed circuit board. They have certain advantages, disadvantages and features of application.
Advantages and varieties of the material presented
Consider the advantages that solder pastes have:
- the possibility of their use for the manufacture of circuit boards with very small details;
- they do not require a soldering iron, however, to work with this material you will need a special hairdryer or station, thanks to which the product warms up;
- you can use such a substance in cases where it is not possible to work with conventional tools.
Solder pastes come in many forms. First of all, they are classified by the method of removing excess substance after work: washing and non-washing. The second option is safer, as it does not lead to corrosion of the board. The first type of pastes can be washed off with water, so they contain components that can harm the radio.
It should also be noted that the substance can be made on the basis of lead or without it. The second type of paste is environmentally friendly.
How to choose and store material?
In order for the work to be done efficiently and accurately, you need to purchase the "right" solder paste. First of all, you should pay attention to the technical characteristics of the substance: humidity and air temperature, storage features.
Presented material may lose its quality depending on aging. The choice depends on the type of paste and its scope. Naturally, an important factor is the cost of the material. Solder paste, the price of which is about $ 10 for 50 grams and above, is purchased only at certified points of sale.
As for the storage of material, it is necessary to put it in the refrigerator, the temperature in which does not rise above 4 degrees. During its use, the room should be warm, but not hot (no more than 25 0 C). Humidity should not reach 80%. Before using the substance, it is necessary to warm it to room temperature and only then open the jar. This can sometimes take up to 6 hours.
Features of the application of the material
Soldering with solder paste has its own nuances. For example, the surface on which the substance will be applied must be absolutely clean, dry and fat free. The fee for the duration of the work should be fixed as firmly as possible in a horizontal position.
The place that will be soldered should be completely covered with the substance. After that, try to very accurately place all the necessary details on the board. Now you can start warming up the product with a hairdryer. The jet should not be too strong. Its temperature should be about 150 degrees until all flux has evaporated from the paste. After that, the jet can be made hot (200-250 0 C).
After all work is completed, the board will need to be cooled and cleaned of residual material. This procedure depends on the type of paste.