MIG Welding
MIG welding is basically the fascinating process of using electricity to help melt and also join pieces of metal. MIG welding is also sometimes known as the "hot glue gun" from the welding world and is normally regarded as the easiest form of welding and can be learnt very easily. MIG welding was developed around 1940’s and even after 60 years the general principle is very much the same still. MIG welding makes use of an arc of electricity so as to create a short circuit in between a continuously fed anode and a cathode. The heat that is produced by the short circuit, with a non-reactive gas can melt the metals and therefore allows them to mix together. After the heat is removed, the metal cools and begins to solidify, and in turn forms a piece of fused metal. MIG welding is considered useful because it can be used to weld different types of metals, stainless steel, carbon steel, magnesium, aluminium, copper, silicon, nickel, bronze and also other alloys.

TIG Welding
TIG actually stands for Tungsten Inert Gas, TIG is used to weld titanium, copper and even two dissimilar metals, comes handy for making fancy welds (e.g. curves, round things etc. TIG basically generates heat through an arc of electricity from a tungsten metal electrode, directly to the metal surface which is to be weld – it is usually steel.

ARC welding
Arc welding is basically one of the several types of fusion processes used for joining metals. It is done by applying heat, the metal at the joints between the two parts are melted and in turn are intermixed. It uses a welding power supply so as to create an electric arc between the electrode and base material and that melts the metals at the welding point. Direct (DC) or alternating (AC) current can be used. The welding region is usually protected by a particular type of inert, semi- inert gas also known as shielding gas. The entire process of Arc welding is popular because of its very low capital and also running costs.

SPOT Welding
It is a process in which metal surfaces that come in contact are joined together by the heat that is obtained from resistance to the electric current flow. The Work-pieces are usually held together under pressure that is exerted by electrodes. The sheets are usually in the range of 0.5-3.0 mm thickness. By forcing a large amount of current through the spot will result in the melting of the metal and will form the weld. The attractive thing about spot welding is that a lot of energy can easily be delivered to a particular spot in a very short time.

PLASMA Welding
In this type of welding the electric arc is formed in between the electrode (that is usually made of sintered tungsten) and the work piece. Following are some of the advantages of Plasma welding.

There is an equalization of distortion stress that eventually results in low residual stress. Less of filler metal is required in the keyhole mode which significantly reduces porosity.