Types Of Welding – Classification of welding processes

Before explaining the types of welding, Let’s understand the basic concept of welding i.e. What is welding?, Then we will understand the different types of welding.

What is Welding ?

Welding is a process of permanently joining two or more parts. It’s a kind of metallic bonding between two parts, which is permanent in nature. Heat and (or) pressure is required to achieve welding, very often additional filler metal is also used during welding.

There are more than 75 types of welding processes available today. Each welding process has its own advantages and disadvantages which makes it either more or less suitable for a particular application.

For example, Arc welding processes offer advantages such as portability and comparatively low cost, but are relatively slow. Laser Welding processes produce low heat inputs and fast welding speeds, but the equipment is very expensive and the joint fit‐up needs to be very accurate.

With Solid‐state welding processes, we can avoid many of the common weld defects, which generally occurs during solidification of molten weld pool, but these welding processes are very expensive and are often applicable for limited joint designs only.

Resistance welding processes are very fast and require no additional filler materials, but are generally applicable for thin sheet applications or very high production jobs such as seams in welded pipe.

Now, we shall learn about the different types of welding which are commonly used in industries;

Types of Welding:

Welding processes are broadly classified as fusion welding and solid state welding (Figure-1)

(Figure-1)

types of welding - classification of welding process

FUSION WELDING: In Fusion welding coalescence is done by melting the base metals by the application of heat. Required heat is generated by an electric arc formed between the electrode and the workpiece. Very often filler metal is also used. Commonly used fusion welding processes are:

  1. Arc Welding

2. Resistance Welding

  • Resistance Spot Welding
  • Resistance Seam Welding
  • Resistance Projection Welding
  • Flash Welding

3. Oxyfuel welding

4. Others

  • Electron beam welding
  • Laser beam Welding

SOLID STATE WELDING: In solid state welding, joining is done by the application of pressure alone or a combination of pressure and heat. Normally the base metal is not reached to the melting point, if heat is applied to obtain the coalescence and filler metal is not used. Some of the solid state welding processes are:

  1. Diffusion welding (DFW)
  2. Friction welding (FRW)
  3. Ultrasonic welding (USW)
  4. Cold Welding
  5. Forge welding
  6. Explosion welding (EXW)

In the following video, I have simplified the different welding processes and categorized for your easy understanding. Please watch this video and share your views as well as queries. I will be glad to answer your queries.

Sandeep Anand

I am a Mechanical Engineer with more than ten years of work experience in the field of welding and NDT.

12 thoughts on “Types Of Welding – Classification of welding processes

  • September 4, 2017 at 6:22 pm
    Permalink

    Great explanations for the non-welder.

    Reply
  • January 28, 2018 at 11:35 am
    Permalink

    can a person with Electrical Diploma take a welding inspectors course ? and will he get a job as a welding inspector?

    Reply
    • January 28, 2018 at 12:56 pm
      Permalink

      Yes. For eligibility details you can see AWS/CSWIP website

      Reply
  • March 12, 2018 at 9:23 am
    Permalink

    Great i hope I can get more information this channel
    Thanks

    Reply
  • April 12, 2018 at 10:19 am
    Permalink

    Great stuff we need more welding info

    Reply
  • June 23, 2018 at 10:17 am
    Permalink

    We all encourage you give so many vedios like this

    Reply
  • August 6, 2018 at 7:24 pm
    Permalink

    I Have International MIG/ MAG Welding Certificate

    Reply
  • January 15, 2019 at 11:33 pm
    Permalink

    anyone can help me, i am master management student, i required to do research methodology subject, since i am in oil n gas industries, therefore i would prefer to choose welding technology as my research methodology

    Reply
  • February 3, 2019 at 5:55 pm
    Permalink

    Sir please aap welder trade ke multiple choice questions ke upar video banaye sir

    Reply

Leave a Reply

Your email address will not be published. Required fields are marked *