Friction stir welding is the early 20th century

Arc welding is still the main method, and electric arc welding technology, progress is mainly driven by the development of power. Foreign enterprises attach great importance to the development of welding power and the power and arc physics and the development of welding technology combined. Whenever there is a new type of welding power sources are also introduced new control methods. For example, when there is power thyristor rectifier welding spatter on the launch of the CO2 waveform control to reduce the square wave AC welding power and welding power supply; when the inverter power supply after the introduction of variable polarity power supply, STT short circuit transfer welding power supply, etc.; and when the all-digital power supply and then the welding current and voltage appear wire feed speed control of the double pulse synchronized aluminum welding power and CMT "cold metal transition" welding power supply and so on. This shows not only the development of welding power circuit design, it is related to electrical technology, microelectronic technology, control technology, computer technology, arc physics, process technology, engineering and technical personnel of the joint and cooperation, we need a multidisciplinary team. The lack of domestic welding machine industry leading enterprises, the lack of such a team, is caused by slow development of the domestic welding machine, small businesses in low-end products only struggling to survive the main reason.
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, 90 the invention by the British Institute of Solid State Welding of welding technology, which is a revolutionary innovation with, because the metal does not melt during welding, non-arc light and heat radiation, low energy consumption, efficiency high, deformation of the workpiece, and many of the advantages of a small, but speedy application. Now in aircraft, rockets,boats, cruise ships, train cars and other aluminum alloy structural manufacturing applied. Some domestic research institutes and universities have purchased the UK patent license to start their own innovation activities, and partially used in production.
In summary, the major industrial countries foreign government attaches great importance to the development of welding technology, they want to use the advanced welding technology to improve production quality, increase efficiency, reduce costs, in order to relatively low labor costs with the country market competition, which is a strategic tool.