Difference between MIG and TIG Welding

Difference between MIG and TIG Welding

Metal Inert Gas (MIG) Welding:

It is also known as Gas metal arc welding (GMAW) or Metal active gas (MAG) welding.

Process: In this process an electric arc is formed between consumable MIG wire electrode and the workpiece metal(s), which results in heating the workpiece metal(s) and it causes them to melt and join.

Equipment: The basic equipment required for MIG welding are Welding torch, a wire feed unit, a welding electrode wire, power supply and shielding gas supply.

Electrode wire: The electrode is generally a metallic alloy wire known as MIG wire. The material of electrode wire depends upon the composition of metal being welded.

Shielding gas: A shielding gas is also fed through the welding gun to protect the process from contaminants present in the air. For welding non-ferrous material, pure inert gases such as argon and helium are used. Mixture of helium, argon and carbon di-oxide is used for stainless steel welding. Pure argon is used as shielding gas for welding of aluminium.

Power supply: A constant voltage, direct current is most commonly used for the MIG welding.

Applications: It is the most popular welding methods in industrial environments. Robots are used in industry to accelerate the manufacturing. It is used for arc spot welding and resistance spot welding. This process is used for welding of Aluminium, non-ferrous material and steels. It is mostly used by sheet metal industry and automobile industry. This process is preferred indoors to avoid contaminants in the weld.


Tungsten Inert Gas (TIG) Welding:

The process is also known as Gas tungsten arc welding (GTAW)

Process: It is an arc welding process in which a non-consumable tungsten electrode is used to produce the weld that delivers current to the welding arc. A filler material is normally used in this process.

Equipment: A welding torch with a non-consumable tungsten electrode, constant current power supply and shielding gas source.

Electrode: It is made of tungsten or tungsten alloy that is not consumed during welding.

Shielding gas: Argon is preferred for welding of stainless steel, aluminium and nickel alloys.

Power supply: It uses a constant current power source.

Applications: It is used in aerospace industry and bicycle industry.