1. Electrode arc welding
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Electrode arc welding is the use of stable burning arc established between the electrode and the workpiece, so that the electrode and the workpiece melt, so as to obtain a solid welding joint process method. During the welding process, the coating continuously decomposes and melts to generate gas and slag, which protects the electrode end, arc, molten pool and its nearby areas to prevent harmful pollution of the atmosphere to the molten metal. The electrode core also continuously melts under the action of arc heat and enters the weld pool to form the filler metal of the weld.
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2. Submerged arc welding
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Submerged arc welding (including submerged arc surfacing and electroslag surfacing) is a welding method in which the arc is burned under the flux layer. Its inherent advantages of stable welding quality, high welding productivity, no arc light and little smoke make it the main welding method in the production of important steel structures such as pressure vessels, pipe section manufacturing, box beam and column.
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3. Argon arc welding
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Argon arc welding is a welding technique that uses argon as a shielding gas. Also known as argon shielding welding. It is to pass argon gas around the arc welding to isolate the air outside the welding area and prevent oxidation of the welding area.
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Argon arc welding technology is a welding technology based on the principle of ordinary arc welding, which uses argon gas to protect the metal welding material and melts the welding material into liquid state to form a molten pool through high current, so that the welding metal and the welding material can achieve metallurgical combination. Due to the continuous sending of argon gas in the high-temperature melting welding, the welding material cannot contact with oxygen in the air. Thus preventing the oxidation of welding materials, so you can weld stainless steel, iron hardware metal.
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4. Gas welding
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gas welding, English: oxygen fuel gas welding (OFW). A welding method that uses the flame generated by the mixed combustion of combustible gas and combustive gas as a heat source to melt welding parts and welding materials to achieve interatomic bonding. The combustion gas is mainly oxygen, and the combustible gas is mainly acetylene and liquefied petroleum gas.
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5. Laser welding
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Laser welding is a method of welding with the heat generated by bombarding the welded parts with a focused laser beam as an energy source. Because of the optical properties of laser, such as refraction and focusing, laser welding is very suitable for the welding of micro parts and parts with poor accessibility. Laser welding also has the characteristics of low heat input, small welding deformation, and is not affected by electromagnetic fields.
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Laser welding has not been widely used because of its high price and low electro-optical conversion efficiency.
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6. Two protection welding
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The two protection welding (full name carbon dioxide gas protection welding) process is suitable for low carbon steel and low alloy high strength steel all kinds of large steel structure engineering welding, its welding productivity is high, good crack resistance, small welding deformation, large deformation range, can be used for thin and medium thick plate welding.
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7. Friction welding
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Friction welding refers to the method of welding by using the heat generated by the friction of the workpiece contact surface as the heat source to make the workpiece produce plastic deformation under the action of pressure.
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Under the action of pressure, it is under the action of constant or increasing pressure and torque that the relative motion between the welding contact end faces is used to generate friction heat and plastic deformation heat in the friction surface and its nearby area, so that the temperature in the nearby area rises to a temperature range close to but generally lower than the melting point, the deformation resistance of the material is reduced, the plasticity is increased, and the oxide film at the interface is broken. Under the action of the overforging pressure, the solid state welding method is realized through the molecular diffusion and recrystallization at the interface with the plastic deformation and flow of the material.
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8. Ultrasonic welding
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Ultrasonic welding is the use of high-frequency vibration waves to transfer to the surface of two objects to be welded, under pressure, so that the surface of the two objects friction with each other to form a fusion between molecular layers.
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9. Soldering
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Brazing is a kind of connection method that uses a brazing metal with a melting point not exceeding 450℃ and is connected by heating to a brazing temperature lower than the melting point of the base metal but higher than the melting point of the brazing metal. The filler metal is spread on the tightly fitted joint surface by capillary action, or on the workpiece surface by wetting action.
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Soft solder is a solder for soft brazing whose liquidus temperature (melting point) does not exceed 450℃. Soft solder is usually an alloy without iron. The temperature of 450 ° C is the dividing point between brazing and soft brazing. Most of the process parameters and influencing factors involved in brazing are also applicable to soft brazing. In fact, industrial terms such as brazing, brazing, or silver welding are also used to distinguish between brazing and brazing.
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10. Braze
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Brazing is a high temperature brazing process. Most brazing temperatures range from 1200 to 1400F° (much higher than the temperature of soft brazing, but much lower than the temperature of fusion welding). Like soft brazing, hard brazing relies on capillary action to fill the joints with filler metal. There are many different kinds of brazing alloys that can be used to weld almost any kind of metal or metal alloy.