Wikipedia defines welding as a fabrication process that joins materials

Washing machine plastic welding machine

Wikipedia defines welding as “a fabrication process that joins materials, usually metals. Hot gas is forced onto the surfaces to be welded.” This is done by melting the part of the materials to be joined and adding some additional molten joining material. Laser welding is very accurate and can be used to produce even the smallest of welds. The molten parts are then joined together to form a weld.

Welding is the most widely practiced way of joining metals together due to the efficiency and economy of the process.Resistance Welding requires that an additional sheet of material is used to cover the pieces that are to be welded together.Laser Welding is the most modern technology available.

The most basic for is Arc Welding where the parts to be joined together are brought into contact with strong electrical current and heated. This is perfect for material which can be damaged by prolonged exposure to extreme heat.Gas Welding is generally used for repair work especially in the case hollow items like tubes and pipes. When the molten material cools, it forms a strong bond or joint. However, because of the high capital cost Washing machine plastic welding machine involved in purchasing this equipment, the cost of welding is also high. Today there are 4 types of welding techniques that are commonly used. The welding process plays a big role in metallurgy with a constant effort underway to find newer and more weld friendly alloys. For this reason it is used in the jewellery industry which has to work with soft metal with low melting points. This provides great strength to a weld, but the process requires expensive equipment and also the use of additional material to encase the weld which makes it expensive and not suitable for all applications. Although the perception of welding is that of a simple process of heating and joining, it is a high technology industry with huge amounts being spent of research and development to find stronger, more accurate and cheaper methods.

Until the advent of the 20th century, welding was confined to blacksmith shops where two pieces of metal were heated to very high temperatures in a forge and then hammered together until the joining occurred. This is the low technology end of welding in its cheapest and least sophisticated form.. This is what is called forge welding. This procedure requires the parts to be subjected to less heat and is suitable for material that may be damaged by exposure to high temperature. It has been estimated that approximately 50% of the Gross National Product of the USA arises from activities that are in some for or another related, perhaps remotely, to welding. High intensity lasers can be tightly focused and produce controllable heat on the surfaces to be welded very quickly. As an example, farming may appear to have nothing to do with welding, but the equipment the framer uses to grow and harvest his crops will have used welding in their manufacturing process