What is an Active Flux in Welding?

Active flux is a term that generally refers to a welding flux from which the amount of elements deposited in the weld metal is dependent upon welding conditions, primarily arc voltage. This term is often used interchangeably with “submerged-arc welding flux.”

The most common type of active flux is made up of a mixture of calcium fluoride (CaF2) and sodium chloride (NaCl).
When this type of flux is used in welding, it helps to create a slag that has a low melting point.
This allows for easy removal of the slag and also helps to prevent weld defects.

Active flux can also be made from other materials, such as aluminum oxide (Al2O3) or zirconium oxide (ZrO2). These materials can be used to create a slag that has a higher melting point, which is helpful for welding metals that are difficult to weld.

When choosing an active flux, it is important to consider the type of metal being welded and the welding conditions that will be used. For example, aluminum oxide is often used for welding stainless steel, because it can create a slag that has a high melting point.

What is a flux used in welding?

Flux is a material that is used to clean the surface of metal before welding. This helps to remove impurities from the metal and also helps to prevent weld defects.

Flux can be made from a variety of materials, such as limestone, dolomite, or fluorspar. The type of flux that is used will depend on the type of metal being welded and the welding conditions that will be used.

What are the 2 purposes of flux?

The two main purposes of flux are to clean the surface of the metal and to protect the weld.

Why flux is used in arc welding?

Flux is used in arc welding because it helps to clean the surface of the metal and to protect the weld. When flux is used to clean the surface of the metal, it helps to remove impurities from the metal. This helps to prevent weld defects. Flux also helps to protect the weld from oxidation. This is important because oxidation can cause the weld to be weaker.

What is the difference between passive and active flux?

Passive flux is a term that generally refers to a welding flux that does not contain any active ingredients. This type of flux is often used for welding metals that are not difficult to weld.
Active flux is a term that generally refers to a welding flux from which the amount of elements deposited in the weld metal is dependent upon welding conditions, primarily arc voltage. This term is often used interchangeably with “submerged-arc welding flux.”

Conclusion

If you are not sure which type of active flux to use, or if you have any questions about welding, it is always best to consult with qualified welding professional.