Concept and development history of the hottest wel

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The concept and development history of welding technology

welding is a processing technology and connection method that enables two workpieces to produce atomic bonding through heating, pressurization, or both. Welding is widely used, both for metal and non-metal

development history of welding technology

welding technology appeared with the application of metal. The ancient welding methods were mainly cast welding, brazing and forging welding. The iron blade copper Tomahawk made in the Shang Dynasty in China is a cast weldment of iron and copper. The fusion line of copper and iron on its surface is winding and well connected. In the tomb of Marquis Yi of Zeng in the spring and Autumn period and the Warring States period, there were many coiled dragons on the bronze base of the drum, which were brazed and connected in sections. After analysis, the composition of the used soft solder is similar to that of modern soft solder

swords made in the Warring States period, with steel blades and wrought iron backs, are generally forged and welded by heating. According to song Yingxing of the Ming Dynasty, in the book "Heaven opens things with the recovery of the economy", in ancient China, copper and iron were heated together in the furnace and forged to make knives and axes; Sprinkle yellow mud or screened chenjiubi soil on the interface, and forge and weld large ship anchors in sections. In the middle ages, weapons were also made by forging and welding in Damascus, Syria

ancient welding technology has remained at the level of casting welding, forging welding and brazing for a long time. The heat source used is furnace fire. The temperature is low and the energy is not concentrated. It can not be used for the welding of large cross-section and long weld workpieces, but can only be used to make decorations, simple tools and weapons

at the beginning of the 19th century, Davis of England discovered two high-temperature heat sources, arc and oxyacetylene flame, which can locally melt metals; China has successively introduced environmental protection policies such as forest protection and returning farmland to forests. From 85 to 1887, BernardOs of Russia invented carbon electrode arc welding tongs; Thermit welding appeared again in 1900

At the beginning of the 20th century, carbon electrode arc welding and gas welding were applied. At the same time, thin coated electrode arc welding also appeared. The arc was relatively stable, the welding pool was protected by slag, and the welding quality was improved, which made manual arc welding enter the practical stage. Electric arc welding has become an important welding method since the 1920s

during the period when glass fiber and carbon fiber are the most commonly used reinforcers, noble in the United States uses arc voltage to control the welding rod feeding speed to make automatic arc welding. What else do we need to do? Machine, thus becoming the beginning of welding mechanization and automation. In 1930, American robinoff invented submerged arc welding using welding wire and flux, and the welding mechanization was further developed. In the 1940s, in order to meet the needs of aluminum, magnesium alloy and alloy steel welding, tungsten electrode and consumable electrode inert gas welding were successively introduced

in 1951, the Barton Electric Welding Institute of the Soviet Union created electroslag welding, which became an efficient welding method for large thickness workpieces. In 1953, lyubowski of the Soviet Union and others invented carbon dioxide gas shielded welding, which promoted the application and development of gas shielded arc welding, such as mixed gas shielded welding, flux cored wire gas slag joint shielded welding and self shielded arc welding

gage invented plasma arc welding in 1957; Electron beam welding, invented in Germany and France in the 1940s, was also applied and further developed in the 1950s; In the 1960s, the emergence of laser welding plasma, electron beam and laser welding methods marked the new development of high-energy density fusion welding, greatly improved the weldability of materials, and made many materials and structures difficult to be welded by other methods welded

other welding technologies include resistance welding, invented by Thompson of the United States in 1887, and used for spot welding and seam welding of thin plates; Seam welding is the earliest semi mechanized welding method in pressure welding. With the progress of seam welding, the workpiece is pushed forward by two rollers; In the 1920s, flash butt welding was used to weld bars and chains. So far, resistance welding has entered the practical stage. In 1956, American Jones invented ultrasonic welding; Friction welding was invented by chudkov of the Soviet Union; In 1959, the Stanford Institute successfully studied explosive welding; In the late 1950s, the Soviet Union made vacuum diffusion welding equipment

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