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Not all welding processes work for every application. Flux offers properties that aid structural welding and offer welds that are much stronger than MIG welding processes.


What Is Welding Flux Used For?

Welding flux is commonly used in the joining of metal. Flux is used to promote the fusion of metals and is prominently used within the welding industry. Welders use it to prevent oxidation of both the base and filler materials used during the welding process. 


Welding flux is almost inert at room temperature but is rapidly reduced when it is exposed to high temperatures. It dissolves the surface oxides and acts as an oxygen barrier to minimize oxidation.


Some Welding Flux Materials:

  • Resin Acids

  • Borax

  • Ammonium Chloride 

  • Zinc Chloride

  • Hydrochloric Acid


Even after the soldering process, flux can still remain corrosive and cause corrosion to the surface of the welded area. Testing and cleaning techniques have been developed to ensure the welded area remains non corrosive after the welding process.


What Is Flux Core Welding? | How To Use Welding Flux

Flux Core Welding uses a tubular wire (flux core wire) that is filled with flux. This is attached to the wire feeding welding gun and deposited at the contact tip along with the filler metal. The arc is then created between the continuous welding wire electrode and the work piece. 


Flux helps the flow of molten metal stay in place. When the arc process begins the base metal melts and the flux begins to enter the weld pool or weld puddle. 


There are three types of welding that use flux. This includes stick welding also known as Shielded Metal Arc Welding (SMAW), Flux-Cored Arc Welding (FCAW), and Submerged Arc Welding (SAW).

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