Difference Between Soldering And Brazing

Difference Between Soldering And Brazing image

Solder and brazing are similar, in both cases a filler material having the melting point much lower than parent material added into the gap between work-pieces by capillary action. The characteristics of this metal joining method may vary in some special application.
Soldering
Brazing
The solder joints are the weakest joints. They are not intended load.
This can be used to carry the burden to some extent.

Properly made brazing may be stronger than the metal to be joined, but they are not as strong as welded joints.
Soldering is done by heating filler metal up to 450 degrees Celsius (840 °F).


Brazing joins materials by heating the filler metal with the melting point above 450 degrees Celsius, but below the melting point of the base metal.
An alloy of lead and tin known as solder used as  filler material.
Alloys of copper with zinc, silver and aluminium are the common brazing filler material.
Close / fine contact between the base material not necessary
Fine contact of the base metal is necessary; they should not have an interfering layer between them.
It has the least impact on the base material.
In the brazing of the greatest strength is achieved through some chemical reaction between solder alloy and metal on each side.
Solders are more vulnerable to oxidation since they are made of the alloy of tin and lead. (In special cases zinc-aluminium alloys used as filler to avoid this problem)
Susceptible to oxidation but not much as in soldering.
The commonly used fluxes for soldering are zinc chloride and HCl.
Fluxes are fluorides, chlorides, Borax and boric acid.
Lower cost, inexpensive filler material, low temperature virtually no cleaning required after soldering.
Costlier than soldering.
It is particularly useful when the heat can damage or deform the materials. Commonly electrical components are soldered to prevent heat damage.
Brazing used for joining dissimilar metal, fastening of pipe fittings and leak proof joints.




Read:
Brazing - Applications, Precautions, Advantages and Disadvantages
Advantages and disadvantages of welding
Advantages and disadvantages of welding over riveting
 

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