How many types of welding are there?

Welding is a method of fusing together two or more pieces of metal using electricity or flame. Welding is used to construct buildings, make metal sculptures, build and repair cars, make gates and furniture, and for many other practical and aesthetic uses. There are multiple types of welding. Here is an overview of the most popular methods:

• Stick welding: Formally known as shielded metal arc welding, stick welding uses extreme heat applied at the seam of two separate metals to melt them together. A third (intermediary) metal may also be incorporated for added strength. As the metals cool, they are bonded together.
• Metal inert gas (MIG) welding: Formally known as gas metal arc welding, MIG welding uses a tool to feed metal wire into the weld puddle while an electrical arc melts the wire, which will fuse to the base metal upon cooling.
• Tungsten inert gas (TIG) welding: Formally referred to gas tungsten arc welding, TIG welding is a similar process MIG welding, but instead of using a tool that continuously feeds metal wire into the weld puddle, the welder must hold and manually feed the stick.
• Gas welding: A mix of flammable gas and oxygen is used to heat metal to the melting point.
• Forge welding: Forging metal is an ancient art that involves heating two pieces of metal until they are molten, then hammering them together.