Welding is the process of joining materials, usually metals or thermoplastics, by using heat and pressure to melt the pieces together. In order to weld metal pieces together, a welding torch is used to heat up the metal until it becomes molten.
In order to weld plastics or other types of materials together, a heated wire is used as the filler material. This wire melts when it comes in contact with the two pieces that are being joined and then cools down and solidifies as a result. The two pieces will then be fused together because of the filler material that has been applied between them.
The use of welding is a very old process that was originally used to join two pieces of metal together. The first welders were blacksmiths and they used to use a technique called forge welding. This involved heating the metal and then hammering it into place with a hammer and anvil. The technique was slow but it had the advantage of being able to be done anywhere.
The next stage in the development of welding came with the introduction of electric arc welding which was invented by Elihu Thomson in 1885. Arc welding is much faster than forge welding because it doesn’t need any heat, just electricity, so it can be done in any workshop or factory without needing any kind of open fire or furnace. It also uses less energy than other techniques because the heat is provided by an electric current