Forging and welding techniques appeared in Egypt in 3000 BC. Over 2000 BC, the Yin Dynasty in China used casting and welding to make weapons.
Before the end of 19, the only welding process was the metal forging welding that blacksmiths had used for hundreds of years. The earliest modern welding technology appeared at the end of 19, including arc welding and oxygen welding, and then resistance welding.
At the beginning of the 20th century, there was a great demand for military equipment in World War I and World War II, and the corresponding cheap and reliable metal connection technology was paid attention to, which promoted the development of welding technology. After the war, several modern welding technologies appeared successively, including the most popular manual arc welding, and automatic or semi-automatic welding technologies such as gas shielded arc welding, submerged arc welding, flux-cored arc welding and electroslag welding.
In the second half of the 20th century, with the rapid development of welding technology, laser welding and electron beam welding have been developed. Nowadays, welding robots have been widely used in industrial production. Researchers are still deeply studying the essence of welding, and continue to develop new welding methods to further improve the welding quality.
Welding: also known as welding and melting, is a manufacturing process and technology to connect other thermoplastic materials such as metals or plastics by heating, high temperature or high pressure.