What are the causes of lead-free tin bars in wave soldering?

These days, there have always been people coming online to find us and asking questions about tin slag. Why is tin slag produced?In fact, as long as the solder rod wave soldering is operated normally, the solder rod will inevitably come into contact with air in the wave soldering furnace, which will produce a large amount of tin slag. Now, the solder paste manufacturer will explain it to you:

I. Tin Content:

The tin metal in the tin bar is the main component. If the content and purity of tin are insufficient, it means that impurities and other elements will increase, which also increases the chance of tin slag overflowing. 

Ii. Furnace Temperature Control: 

No matterLead-free tin barWhether there is a fixed melting point and working temperature, if the temperature of the welding furnace is not properly controlled, it will also accelerate the oxidation process and cause more tin slag to overflow. When the furnace temperature is high or low, black tin ash oxide will constantly appear on the surface of the tin furnace liquid. 

Iii. Characteristics of Tin Metal: 

Whether lead-free and environmentally friendly tin strips are composed of tin alloys or not, tin will undergo a chemical reaction during continuous contact with air, generating tin slag oxides. During the welding operation, the tin strip is solidified through high temperature, which will greatly accelerate the oxidation rate of tin, and the tin slag will increase more and more. 

Iv. Antioxidant Elements: 

When producing lead-free and environmentally friendly tin bars, antioxidant metals must be added to slow down the rate of air oxidation at blast furnace temperatures and reduce tin slag. If the added antioxidant elements are insufficient, more tin slag will overflow.

When the wave peak is too high and the solder drops, the cooling deviation is relatively large. The solder mixed with air rushes into the tin furnace, causing semi-dissolution of oxidation and resulting in the formation of tin slag. The rotary pump failed to take preventive measures and continuously pressed tin slag into the furnace chamber. The circulating chain reaction accelerated the generation of tin slag. There is also the human factor of the wave soldering operator. The operation process of wave soldering requires professional operation and cannot be taken lightly.

The above is an explanation of some phenomena that may occur during the wave soldering process, such as tin slag. There will definitely be some to a greater or lesser extent. Adding tin bars at the appropriate time is also very crucial. Therefore, everyone should pay attention to the situation. If you want to know the solutions, you can consult.