Welding: Principles and Applicatio...

8th Edition
Larry Jeffus
ISBN: 9781305494695



Welding: Principles and Applicatio...

8th Edition
Larry Jeffus
ISBN: 9781305494695
Textbook Problem

How do fluxes react with the base metal?

To determine

The manner in which fluxes react with base metal.


Fluxes are the chemical compounds which react with the base metal also. The reaction of the base metal with flux can be in the form of salts, alkali or acids.

The soldering fluxes may be acidic such as muriatic acid which is a diluted hydraulic acid, or the flux may be a salt such as Cal-ammoniac which is ammonium chloride, or the flux may simply be a rosin.

The brazing fluxes can react with the base metal in the form of fluorides, chlorides, boric acid and alkalis. These compounds easily clean up the surfaces by breaking up the thin surface oxides by dissolving or absorbing and finally breaking up the oxide layer mechanically.

The chemicals present in the fluxes directly react with the oxide layer on the parts to be joined in the form of either acid or base.

The flux material helps to clean the surface before the joining process by removing or reducing the oxides formed on the surface. Fluxes also help in enhancing the capillary action, this enhanced capillary action is the reason of filler metal flowing inside the spacing between the parts.

Figure: Fluxes remove the oxides and clean the surface which helps in preparing a better joint...

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