Electric Welding|Resistance welding Electric Arc Welding

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Electric-welding

Electric Welding: Electric welding is the process of joining two metal pieces,by using electrical energy to generate heat at the point of welding in order to melt the joint.

Let’s start from the question: what is welding?

Welding is the process of joining two pieces of metal or non-metal together by heating them to their melting point.

Filler metal may or may not be used to join two pieces.

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The physical and mechanical properties of a material to be welded such as melting temperature, density, thermal conductivity, and tensile strength take an important role in welding.

Depending upon how the heat applied is created; we get different types of welding such as thermal welding, gas welding, and electric welding.

Welding is nowadays extensively used in automobile industry, pipe-line fabrication in thermal power plants, machine repair work, machine frames, etc.

aDVANTAGES AND DISADVANTAGES OF WELDING

Advantages of welding


Some of the advantages of welding are:

  • Welding is the most economical method to permanently join two metal parts.
  • It provides design flexibility.
  • Welding equipment is not so costly.
  • It joins all the commercial metals.
  • Both similar and dissimilar metals can be joined by welding.
  • Portable welding equipment are available.

Disadvantages of welding

Some of the disadvantages of welding are:

  • Welding gives out harmful radiations and fumes.
  • Welding needs internal inspection.
  • If welding is not done carefully, it may result in the distortion of work-piece.
  • Skilled welding is necessary to produce good welding

What is Electric Welding?


Electric welding is defined as the process of joining two metal pieces, in which the electrical energy is used to generate heat at the point of welding in order to melt the joint.

Types of Electric welding


The classification of electric welding process is shown:

electric-welding-types

Electric welding types are

  1. Resistance welding
  2. Spot welding
  3. Seam welding
  4. Projection welding
  5. Butt welding
  6. Upset but welding
  7. Flash butt welding
  8. Arc Welding
  9. Hetal arc welding
  10. carbon arc welding
  11. Atomic hydrogen arc welding
  12. Helium or Argon welding

Choice of Welding time

The selection of proper welding process depends on the following factors.
o The type of metal to be joined.
o The techniques of welding adopted.
o The cost of equipment used.
o The nature of products to be fabricated

electric-welding-time

Resistance welding


Resistance welding is the process of joining two metals together by the heat produced due to the resistance offered to the flow of electric current at the junctions of two metals.

Types of resistance welding


Depending upon the method of weld obtained and the type of electrodes used, the resistance welding is classified as:

  1. Spot welding.
  2. Seam welding.
  3. Projection welding.
  4. Butt welding

Electric arc welding

Electric arc welding is the process of joining two metallic pieces or melting of metal is obtained due to the heat developed by an arc struck between an electrode and the metal to be welded or between the two electrodes as shown below.

In this process, an electric arc is produced by bringing two conductors (electrode and metal-piece) connected to a suitable source of electric current, momentarily in contact and then separated by a small gap, arc blows due to the ionization and give intense heat.

The heat so developed is utilized to melt the part of work-piece and filler metal and thus forms the weld.

In this method of welding, no mechanical pressure is employed; therefore, this type of welding is also known as ‘non-pressure welding’.

Types of electric arc welding

Various types of electric arc welding are:

  1. Carbon arc welding.
  2. Metal arc welding.
  3. Atomic hydrogen arc welding.
  4. Inert gas metal arc welding.
  5. Submerged arc welding.

Each of the welding methods will be explained in detail in next post. Please subscribe to notifications.

Read more on Electric Welding

Books on Welding

  1. The Big Book of Welding for Beginners: An Instruction Handbook to Weld, Cut, and Shape Metal with 10 Welding Projects Included Plus Tips, Tricks and Tools to Get You Started
  2. Welding Processes and Technology
  3. Welding Engineering
  4. Text Book Of Welding Technology

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