Welding refers to the connection or fusion of welding parts by using heat or compression so that the pieces form a continuum. The source of heat in welding is usually an arc flame produced by the electricity of the welding power supply.
Normally there are 3 types of welding process. MMA welding, MIG/MAG welding, TIG welding.
MMA welder ( Manual metal arc ) also known as shielded metal arc welding (SMAW), flux shielded arc welding or informally as stick welding, is a manual arc welding process that uses a consumable electrode coated in flux to lay the weld.
MIG ( Metal inert gas ) is also known as Gas metal arc welding (GMAW) or metal active gas (MAG) welding, is a welding process in which an electric arc forms between a consumable melt and join.
Gas tungsten arc welding (GTAW), also known as tungsten inert gas ( TIG welder) welding, is an arc welding process that uses a nonconsumable tunsten electrode to produce the weld.
The most commonly welded materials are metals, such as aluminium, mild steel and stainless steel.