Welding, Soldering and brazing are the most common joining process
use in industries for joining same and different metal. Today we will learn
about these processes and further we will compare welding vs soldering vs brazing. These all are joining processes but different process uses in
different conditions. Welding is use in mechanical industries for jointing same
or different metals. The main function of welding is to make a strong joint which
can carry all mechanical stresses. Soldering are used in electrical
and electronics industries. It is use to joint wire to panel. Main function to
these processes to make a electrically strong joint which can withstand in any
electrical condition. Brazing is use to joint dissimilar metal in automobile and aircraft industries.
Brazing vs Welding vs Soldering:
What is welding?
Welding is a most common joint process in mechanical
industries. Two metals joint by using of heat energy with and without filler
material or pressure is known as welding. It forms a permanent joint. In this
process, both work pieces to be joint are heated until its plastic stage. These
work piece bring close and allow to solidify. After solidification a strong
joint is achieved. Sometimes filler material is use to joint metal, where filler
material placed between work pieces in molten stage. As it solidifies, it makes
a strong joint. The heat use to heat work pieces is achieved by burning gases like
acetylene or by using electric arc. According to method of achieving heat, welding
is divided into Gas welding and Arc welding. Sometimes welding is perform by
using only pressure and friction without applying heat and filler material ,
known as pressure welding and friction welding.
Welding is use as permanent fastener, which can stand with working
stresses. The main function of welding it to provide the strongest joint, which
will not fail during working. A main disadvantage of welding joints is that it
is brittle in nature so cannot stand with fatigue stress. One other big problem
occurs due to uneven heating and cooling which increase internal stresses.
Advantages of welding:
1. It is more suitable permanent joint.
2. No hole is required, so stress concentration is less.
3. No filler plate requires so overall weight of work piece is
less.
4. Welding joints have high efficiency.
5. The rate of joint is high compare to other joining processes.
6. Less labour required.
Disadvantages of welding:
1. The welding joints are brittle witch cannot withstand
with fatigue load.
2. Due to uneven heating, internal stress develops in welding.
3. Skill labour required
4. It is difficult to inspect.
What is soldering?
Soldering is almost similar to welding except it use to joint
wire in electrical and electronics industries. In welding process, a strong
joint is making between two plates by using heat. This joint withstand with high
mechanical stress and load. It is use to make good mechanical connection.
Soldering is same as welding except it is use to make good electrical connection.
In the soldering process solder is use as the filler motel to
join the wire or other small electrical component like resistor, capacitor to
panel. Solder is a soft alloy of lead and tin. It is high electric conductor
and has low melting point. A soldering iron is use to heat up the filler metal
witch melts the solder over the joint. Soldering iron tip is use to place the
solder over joint. As the solder solidified, it makes a good strong joint between
the electric components like capacitor, resistor to the panel. Solder is a mechanical
connection. It’s main function to provide a good electrical connection between
these components. Soldering is use widely in electronics industries.
Advantages of soldering:
1. it require less heat.
1. Solder is good electric conductor so make a good
electrical joint.
3. It does not require skilled labour.
What is brazing?
Brazing is the most common joining process to join dissimilar
metals. It is similar to soldering except high temperature is use in brazing.
Brazing is a joining process of metal which is done at the lower temperature of
melting of work piece. In this process silver based alloy is use as the filler
metal which melting temperature is above 450C but below the melting temperature
of base metal. The molten metal allow to flow between gapes by capillary action.
One big advantage of this joint is gives similar strength for similar and dissimilar
base metal.
Brazing is done into open atmosphere which can cause of
forming oxide of metal. A flux is use to prevent the joint by oxygen.
Advantages of brazing:
1. It does not melt base metals.
2. Both similar and dissimilar metals can join.
3. It does not form internal stress due to uneven heating.
4. It can use in mass production.
5. Brazing produces a clean joint.
Difference between Welding, Brazing and Soldering
S. No.
|
Welding
|
Brazing
|
Soldering
|
1.
|
It requires high temperature above melting point of base metal. It is above 3000C.
|
It requires temperature below melting point. It is up to 800C.
|
It requires low temperature below 450C.
|
2.
|
It forms strongest mechanical joint which can withstand with high working stress.
|
Brazing joints are stronger than soldering but weaker than welding.
|
It forms weakest mechanical joint. But this joints are highly electrical conductor so form a strong electrical joint
|
3.
|
High skilled labour required
|
Less skill require to join metal.
|
Less skill requires.
|
4.
|
Preheating of base metal does not require.
|
Preheating of base metals require.
|
Preheating of base metal is essential.
|
5.
|
The properties of base metal may change.
|
No change in mechanical properties.
|
No change in mechanical properties.
|
6 .
|
It is not required to clean the work piece before weld.
|
The work piece is clean before joining.
|
It is essential to clean the work piece.
|
Today we have discussed about welding, soldering and brazing. We have also compared brazing vs welding vs soldering. If you have any query regarding this article, ask by commenting.