What is Arc Welding?
Arc Welding: The process of joining metal to metal with the help of an electric arc is called arc welding.
In the arc welding, the arc is used to create intense heat and this heat is used to join the metals together. the arc is brought in between two metal pieces and due to the heat generated, the metals melt and when it cools a strong welded joint is formed.
- The power source used in arc welding is electricity (electric current). The electric current used may be either direct (DC) or alternating (AC).
- The welding region is protected by some shielding gas, vapors or slag. The shielding gas protects the weld area from atmospheric contamination.
- The arc welding can be manual, semi-automatic or fully automated.
- It uses consumable or non-consumable types of electrodes for the welding purpose.
- This type of welding is invented in the late 19th century. In the World War II, it becomes commercially important in shipbuilding. Nowdays it is used in the in the fabrication of steel structures and vehicles.
Types of arc welding
The various types of arc welding are:
1. Shielded Metal Arc Welding (SMAW)
2. Gas Metal Arc Welding (GMAW) or (MIG)
3. Flux-Cored Arc Welding (FCAW)
4. Submerged Arc Welding (SAW)
5. Gas Tungusten Arc Welding (GTAW) or (TIG)
6. Plasma Arc welding (PAW)
7. Atomic Hydrogen Welding (AHW)
8. Carbon Arc Welding (CAW)
9. Electroslag Welding (ESW)
10. Electrogas Welding (EGW)
11. Stud Arc Welding
Basic Circuit Diagram
Equipment of Arc Welding
The various equipmets used in arc welding are:
1. AC or DC machine
3. Electrode holder
4. Cables, cable connectors
5. Chipping hammer
6. Earthing clamps
7. Wire brush
9. Safety goggles
10. Hand gloves
11. Aprons, sleeves etc.
How arc welding works
- First ON the electric power source ( AC or DC).
- As the electrode is bring near the base metal ( 2-4 mm apart) where the welding is to be done, spark or arc starts to produce in between the base metal and electrode.
- Intense heat is generated due to the arc produced. The heat produced melts the base metal, electrode core ( or filler material in some case) and flux coating. The flux coating on the electrode provides shielding environment (shielding gas) to the weld from the atmospheric contamination. The molten metal or slag gets deposited in between the two metal pieces to be joined and gets solidifies. After solidification it forms a strong bond in between the two metal pieces.
- Shielding gas is used to protect the melt or weld from atmospheric contamination.
- After completion of the welding process, the job (metal pieces) is cooled down by dipping it in appropriate coolant. It can also be left for air cooling.
- This is how the arc welding is done.
Advantages and disadvantages
- It has high welding efficiency and speed.
- It provides better welding environment.
- It gives consistent quality of weld
- It forms the strong bond in between the joined metals.
- It has simple welding equipment.
- Power source is not so expensive.
- It is fast and reliable process.
- Equipments can be used for multiple functions.
- It is easily portable.
- Welders can use standard domestic current.
- High skilled operator is required to do arc welding.
It is the versatile welding process. It is most widely used welding process in the world because of its simplicity and good welding efficiency. Almost in every manufacturing industry the arc welding is used for producing strong joints. Today it remains an important process in fabrication of steel structures and vehicles. It is most widely used in automotive industries, construction industries, in construction of buildings, shipbuilding industries, aerospace industries, for the maintenance or repair works.
This is all about what is arc welding. If you find anything incorrect than inform us through you comments. And if you find this article informative, than don’t forget to like and share it on Facebook and Google+.