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.
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.
MIG Welding
MIG welding, also known as Gas Metal Arc Welding (GMAW), is a process that utilizes a continuously fed solid electrode, shielding gas from an externally supplied source, and electrical power to melt the electrode and deposit this molten material in the weld joint. The equipment used automatically regulates the electrical characteristics of the arc. The only manual controls required of the welder for semi-automatic operation are travel speed, travel direction and gun (torch) positioning. Given proper equipment settings, the power supply will provide the necessary amperage to melt the electrode at the rate required to maintain the pre-selected arc length (voltage). For example, an increased stick-out, produced by drawing the torch back from the work piece, results in a reduction in current from the power supply. This maintains the same heating of the electrode and returns the arc length to its preset condition. Filler metal selection should be closely matched to the base material being welded. In MIG Welding, the filler metal not only conducts current to the arc zone (resulting in melting the base metal and electrode), but adds reinforcement to the completed weld joint.
MIG Welding can be used on a wide variety of metals and in a number of different base metal thicknesses.
MIG Welding can be used on a wide variety of metals and in a number of different base metal thicknesses.
TIG Welding
TIG welding, also known as gas tungsten arc welding (GTAW), is an arc welding process that uses a non-consumable tungsten electrode to produce the weld. TIG welding utilizes a constant current welding power supply to generate an electric arc between the tungsten electrode and the workpiece, using the resultant heat to create the weld.
The weld area is generally protected from atmospheric contamination by use of an inert shielding or cover gas (argon or helium).
The weld area is generally protected from atmospheric contamination by use of an inert shielding or cover gas (argon or helium).
