Solderable range
Not all materials can be connected by soldering. Only some metals have good solderability (strictly speaking, they should be solderable) and can be connected by soldering. Generally, copper and its alloys, gold, silver, zinc, nickel, etc. have good solderability, while aluminum, stainless steel, cast iron, etc. have poor solderability. Generally, special fluxes and methods are required to solder them.
Solder qualified
Insufficient lead-tin solder composition or excessive impurities will affect the quality of solder, especially the content of certain impurities, such as zinc, aluminum, cadmium, etc. Even the content of 0.001% will significantly affect the solder wettability and fluidity, reducing the Welding quality. It is obvious that even the most skilled chefs cannot produce delicious food with inferior ingredients.
The flux is suitable
Different fluxes should be used for welding different materials. Even if the same material is used, different fluxes are often used when the welding process is different, such as manual soldering iron welding and dip welding. After welding, different fluxes need to be used for cleaning and non-cleaning. . For manual soldering, the use of rosin and active rosin can meet most electronic product assembly requirements. It should also be pointed out that the amount of flux must also be paid attention to. Too much or too little is not conducive to soldering.
Solder joint design
Reasonable solder joint geometry is very important to ensure the quality of soldering. Due to the limited strength of lead and tin materials, it is difficult to ensure sufficient strength of solder joints.
