Types of welding process with diagram and chart


What is Welding?

Welding can be defined as the process of joining two or more materials together by fusing them using heat. When two parts to be joined are melted together, heat or pressure or both is applied with or without added metal for the formation of a metallic bond. There are many types of welding techniques used to join metals. The welding processes differ in the manner in which temperature and pressure are combined and achieved.

What is Need for welding?

Welding is a vital process in manufacturing. Almost all engineering materials required joining when producing machinery parts or tooling. Myriad types of welding processes are used to join different metallurgical types using various welding processes. Welding joints offer reliability and integrity to the components with equal or exceeding material strength. This helps to make components at an economical rate.

Types of welding processes

There are many types of welding techniques used to join metals. The welding processes differ in the manner in which temperature and pressure are combined and achieved and based on that types of welding are classified.

The welding process is divided into two major categories:

  • Fusion Welding (General classification shown in figure 1) and
  • Pressure Welding (Classification shown in figure 2).
Figure 1, Fusion Welding classification​
Figure 2, Pressure welding classification

Figure 3 shows the classification of various welding processes as defined by the American Welding Society (AWS).

Stick Welding (SMAW)

TIG Welding (Gas Tungsten Arc Welding)

MIG-MAG (Gas Metal Arc Welding)

FCAW (Flux Cored Arc Welding)

SAW (Submerged Arc Welding)


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