fluxes used in welding

fluxes can be defined as a chemical cleaning agent, flowing agent, or purifying agent or for other functions.

flux is used for both metal extraction as well as joining of metals.

Earliest used fluxes were carbonate of soda, potash, charcoal, coke, borax,lime, lead sulfide.

As cleaning agents, fluxes facilitate soldering, brazing, and welding by removing oxidation from the metals to be joined.

Common fluxes are: ammonium chloride or rosin for soldering tin; hydrochloric acid and zinc chloride for soldering galvanized iron (and other zinc surfaces); and borax for brazing, braze-welding ferrous metals, and forge welding.

removes oxidation from the surfaces to be soldered .

seals out air thus preventing further oxidation of the weld pool and enable high productive and robust welding conditions for manufacturing.

facilitating amalgamation improves wetting characteristics of the liquid solder.

It provides a protective barrier against igniting.

It helps with heat transfer from heat source to metal surface and it helps in the removal of surface metal wastes.

It also helps the deposits of metal from the electrode.