What is Difference between Soldering and Brazing?

Hello, friends today I will talked about Soldering and Brazing and also we will know that What is Difference between Soldering and Brazing. 

Soldering and Brazing both are joining two or more similar and dissimilar metal.

Like welding process but soldering and brazing joining strength is less as compare to welding.

Soldering and brazing both are mostly used in small industry.

So there is common Difference between Soldering and Brazing which will we know in detail.

For knowing Difference between Soldering and Brazing first of all we will know step by step about soldering and Brazing.

So let's start


What is Soldering?


difference between soldering and brazing
Soldering

Soldering is the method to joining two or more similar or dissimilar metal parts without any changing to its original structure.

Soldering process is done by fusible alloy which is known as a solder. 

Solder is applied in a molten state on the metal and after solidification, it forms the joint.

One of the most advantages in soldering that is there is no any changes in mechanical properties when joining any similar or dissimilar metal.


What is Solder?

Solder is nothing but it is a mixture of tin and lead which melting point temperature is its around 235°C and 350°C, respectively. 

But when tin and lead are mixed then the melting point of mixture is reduced to 183°C.

Depending on the melting points, the solder are classified as

  • Hard Solder
  • Soft Solder


Hard Solder

Hard solder is used for joining large metal pieces , thick wires and also used joining  cables of copper, iron brass and so more .

Hard solder melting point is so high as comparison to other types of solder.

Hard solder can be classified in two types

1. Spelter Solder

2. Silver Solder


1. Spelter Solder

It is made in three compositions and used according to the requirement.

(a) Copper = 50 %, Zinc = 50 %

(b) Copper = 67 %, Zinc = 33 %

(c) Copper = 50 %, Zinc = 37 %, Tin = 13 %


 2. Silver Solder

Silver solder is used for joining precious type of metal like gold,silver,german silver and many more.

Silver solders melting point is less as compare to spelter solder.

Its composition for joining different metals is

(a) Copper = 33 %, Silver = 67 %

•It is used to solder silver articles.

(b) Copper = 20 %, Silver = 10 %, Gold = 70 %

•It is used to solder gold jewellery.

(c) Copper = 20 %, Silver = 70 %, Zinc = 10 %

•It is used to solder ornamental jewellery.

(d ) Copper = 35 %, Zinc = 55 %, Nickel = 10 %

•It is used to soldering for German silver.


Soft Solder

Soft solder melting point is less as compare to silver solder.

Soft solder is a combination of lead and tin alloy.

In the soft solder  melting point is inversely proportional to the amount of tin in the solder.


Flux

Flux is normally available in the form of powder, paste and liquid, It protect the joining surface from oxidisation and also clean the surface.


Methods of Soldering

According to the method of heating, soldering is classified as

• Soldering iron method

• Soldering torch method

• Dip and wave method

• Induction method

• Furnace and hot plate method

• Ultrasonic method

• Resistance and hot plate method

•Spray method

• Condensation method

In above methods, only first two methods are mostly used.

So, here we will discuss these two methods.


Soldering Iron Method

It is one of the oldest methods of soldering. It is a type of hand tool used for the purpose of soldering.  In iron method process heat is supplies such that to flow between the workpiece join similar or dissimilar metal. 

A soldering iron is composed of a heated metal tip, a stem and an insulated handle.

Soldering iron method is like similar to smith forging the only difference is soldering is joining similar or dissimilar metal while forging is deforming the metal in a particular shape.


Soldering Torch Method

The method of soldering in which heating is done by using heat energy provided by gas torch is known as soldering torch method.


What is Brazing?


Brazing

Brazing is also a metal joining process where a filler metal is heated above melting point and distributed between two or more close fitting parts by capillary action.

In brazing process filler metal is heated such that no any contact with atmosphere, usually a flux, when its melting above melting point temperature.


What is Spelter or Brazing Alloy?

The filler metal is used for brazing which is called by a spelter or brazing alloy or also called  solid solder. 

There are different variety of alloys is used as a filler metal for brazing.

The variety of alloys which is used in brazing that’s depend on the method of application used.


Methods of Brazing

The different methods used for the brazing process are discussed below

These processes are almost same as soldering.

•Blow Pipe Brazing

•Furnace Brazing

•Torch Brazing

•Vacuum Brazing

•Induction Brazing

•Dip Brazing

•Resistance Brazing


Blow Pipe Brazing

This method is mainly used by the goldsmith in brazing of ornaments. It is used for small size job joints.


Furnace Brazing

In this method, furnaces is used to heat the workpiece to be joined by brazing operation. The internal stress developed in a joint by this method is minimum.

Because during heating of workpiece its behave like a heat treatment process that’s why some mechanical properties changes during brazing. 


Torch Brazing

In torch brazing method, flux is used  to a surface, and also a focusing flame torch is used which is against the workpiece at the joint. A filler metal wire or rod is added to the joint.

Torch uses mixture of two gases, oxygen and acetylene, as a fuel in gas welding.


Vacuum Brazing

It is a special type of furnace brazing, in which metal is prevented from oxidation, by creating vacuum around surrounding.


Induction Brazing

In this method, electricity is used for brazing. This method uses electrical resistance of workpiece to generate the heat. In induction brazing method which  parts to be joined firstly its  pre-loaded with filler metal and then its placed in a high frequency AC field. Frequencies range is used up to  from 5 to 5000 kHz.


Dip Brazing

In dip brazing, the parts which have to be joined are dipped inside molten filler metal after applying flux on it.


Resistance Brazing

In resistance welding, the workpieces are directly connected to electrical current rather than induction of the electric current line. Heat to melt the filler metal is generated by resistance of flow of electric current through the joint to be made.


Comparison of Soldering and Brazing

All the two processes Soldering and brazing have similarity that these are bonding processes.

In all the two processes filler metal, flux and heat energy are used. But the strength of bond and its durability and other feature as different. So, let us compare these, as shown in below in table.


Difference between Soldering and Brazing


difference between soldering and brazing
Difference between Soldering and Brazing 


So friends I hope you well know about Soldering and Brazing and also Difference between Soldering and Brazing.


Thank You.


FAQ for Soldering and Brazing


What is the difference between brazing and soldering?

Ans. There are so many difference between brazing and soldering but most common difference is in soldering process there is no any changes in mechanical properties of materials or metal while during brazing found some negligible changes.

Which is stronger soldering or brazing?

Ans. Soldering is weakest joint as compare to brazing.

Is brazing as strong as welding?

Ans. No, Brazing joint is weakest as compare to welding because welding joint is more strongest.

Is brazing permanent?

Ans. Yes, Brazing is a permanent joint but it is weakest as compare to welding.

What is similarity between soldering and brazing?

Ans. In both soldering and brazing no any heat treatment required and also both can join dissimilar metal.

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