Welding is a fabrication process that involves the joining of materials, usually metals or thermoplastics, by causing fusion. This is often done by melting the workpieces and adding a filler material to form a pool of molten material that cools to become a strong joint.

Types of Welding:

1. Shielded Metal Arc Welding (SMAW): Also known as stick welding, it uses a consumable electrode covered with a flux to lay the weld.

2. Gas Tungsten Arc Welding (GTAW): Also known as TIG welding, it uses a non-consumable tungsten electrode to produce the weld.

3. Gas Metal Arc Welding (GMAW): Also known as MIG welding, it uses a continuously fed wire electrode and a shielding gas to create the weld.

4. Flux-Cored Arc Welding (FCAW): This type uses a continuously fed consumable electrode containing a flux and a constant-voltage to create the weld.

5. Submerged Arc Welding (SAW): It uses a continuously fed consumable electrode and a blanket of granular fusible flux to create the weld.

6. Electroslag Welding (ESW): This type is similar to SAW but the flux becomes conductive and provides a path for the welding current.

7. Plasma Arc Welding (PAW): It uses a constricted plasma arc and a fine-bore copper nozzle to create the weld.

Classification of Welding:

Welding can be classified into two main categories:

1. Fusion Welding: In this type of welding, the material of the pieces being joined is melted and fused together. This category includes methods like arc welding, oxy-fuel welding, and resistance welding.

2. Solid State Welding: In this type of welding, the pieces are joined under pressure, but the material does not melt. Instead, the joint is formed by diffusion, deformation, or a combination of both. This category includes methods like friction welding, ultrasonic welding, and explosion welding.

Question

Welding is a fabrication process that involves the joining of materials, usually metals or thermoplastics, by causing fusion. This is often done by melting the workpieces and adding a filler material to form a pool of molten material that cools to become a strong joint.

Types of Welding:

1. Shielded Metal Arc Welding (SMAW): Also known as stick welding, it uses a consumable electrode covered with a flux to lay the weld.

2. Gas Tungsten Arc Welding (GTAW): Also known as TIG welding, it uses a non-consumable tungsten electrode to produce the weld.

3. Gas Metal Arc Welding (GMAW): Also known as MIG welding, it uses a continuously fed wire electrode and a shielding gas to create the weld.

4. Flux-Cored Arc Welding (FCAW): This type uses a continuously fed consumable electrode containing a flux and a constant-voltage to create the weld.

5. Submerged Arc Welding (SAW): It uses a continuously fed consumable electrode and a blanket of granular fusible flux to create the weld.

6. Electroslag Welding (ESW): This type is similar to SAW but the flux becomes conductive and provides a path for the welding current.

7. Plasma Arc Welding (PAW): It uses a constricted plasma arc and a fine-bore copper nozzle to create the weld.

Classification of Welding:

Welding can be classified into two main categories:

1. Fusion Welding: In this type of welding, the material of the pieces being joined is melted and fused together. This category includes methods like arc welding, oxy-fuel welding, and resistance welding.

2. Solid State Welding: In this type of welding, the pieces are joined under pressure, but the material does not melt. Instead, the joint is formed by diffusion, deformation, or a combination of both. This category includes methods like friction welding, ultrasonic welding, and explosion welding.

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