1.What is ERW black steel pipe?
ERW black steel pipe is a welded pipe made from black steel pipe through electric resistance welding. High frequency resistance welding is a technique used to join metal pipes and other metal components. It usually uses high-frequency current to heat both ends of the pipe to bring it to the melting temperature and connect them in the molten state. Black steel pipe is a steel pipe that has not been galvanized or painted and is usually used to transport gases and liquids. Therefore, high-frequency resistance welding of black steel pipes refers to the process of joining untreated black steel pipes using high-frequency resistance welding technology.
2. Welding principle of ERW black steel pipe
High-frequency welding is based on the principle of electromagnetic induction and the skin effect, proximity effect and eddy current thermal effect of AC charges in the conductor, so that the steel at the edge of the weld is locally heated to a molten state. After being extruded by the roller, the butt weld is inter-crystalline. Combined to achieve the purpose of welding. High-frequency welding is a kind of induction welding (or pressure contact welding). It does not require weld fillers, has no welding spatter, has narrow welding heat-affected zones, beautiful welding shapes, and good welding mechanical properties. Therefore, it is favored in the production of steel pipes. Wide range of applications.
The high-frequency welding of ERW black steel pipe utilizes the skin effect and proximity effect of alternating current. After the steel (strip) is rolled and formed, a circular tube blank with a broken section is formed, which is close to the center of the induction coil in the tube blank. Rotate one or a group of resistors (magnetic rods) nearby, and the resistor and the opening of the tube blank form an electromagnetic induction loop. Under the action of the skin effect and proximity effect, a strong and concentrated thermal effect is generated at the edge of the tube blank opening, causing the The edge of the weld is quickly heated to the temperature required for welding and is extruded by a pressure roller. The molten metal realizes inter-crystal bonding and forms a strong butt weld after cooling.
3.The application of ERW black steel pipe
(1)Construction industry
ERW black steel pipe is used in building structures, support rods and pressure transmission pipes, such as large roof frames, support structures of high-rise buildings, rainwater, sewage, gas pipelines in municipal road construction, etc.
(2) Energy industry.
ERW black steel pipe plays an important role in the fields of oil and gas transportation, hydropower stations and nuclear power plants because they can withstand high pressure, high temperature and corrosive environments to ensure the safe transportation of oil and gas.
(3)Petrochemical industry.
ERW black steel pipes are widely used in petroleum refining, chemical production, etc. because they have high corrosion resistance, can reduce the loss of chemical substances, and improve industrial production efficiency.
ERW black steel pipe is a welded pipe made from black steel pipe through electric resistance welding. High frequency resistance welding is a technique used to join metal pipes and other metal components. It usually uses high-frequency current to heat both ends of the pipe to bring it to the melting temperature and connect them in the molten state. Black steel pipe is a steel pipe that has not been galvanized or painted and is usually used to transport gases and liquids. Therefore, high-frequency resistance welding of black steel pipes refers to the process of joining untreated black steel pipes using high-frequency resistance welding technology.
2. Welding principle of ERW black steel pipe
High-frequency welding is based on the principle of electromagnetic induction and the skin effect, proximity effect and eddy current thermal effect of AC charges in the conductor, so that the steel at the edge of the weld is locally heated to a molten state. After being extruded by the roller, the butt weld is inter-crystalline. Combined to achieve the purpose of welding. High-frequency welding is a kind of induction welding (or pressure contact welding). It does not require weld fillers, has no welding spatter, has narrow welding heat-affected zones, beautiful welding shapes, and good welding mechanical properties. Therefore, it is favored in the production of steel pipes. Wide range of applications.
The high-frequency welding of ERW black steel pipe utilizes the skin effect and proximity effect of alternating current. After the steel (strip) is rolled and formed, a circular tube blank with a broken section is formed, which is close to the center of the induction coil in the tube blank. Rotate one or a group of resistors (magnetic rods) nearby, and the resistor and the opening of the tube blank form an electromagnetic induction loop. Under the action of the skin effect and proximity effect, a strong and concentrated thermal effect is generated at the edge of the tube blank opening, causing the The edge of the weld is quickly heated to the temperature required for welding and is extruded by a pressure roller. The molten metal realizes inter-crystal bonding and forms a strong butt weld after cooling.
3.The application of ERW black steel pipe
(1)Construction industry
ERW black steel pipe is used in building structures, support rods and pressure transmission pipes, such as large roof frames, support structures of high-rise buildings, rainwater, sewage, gas pipelines in municipal road construction, etc.
(2) Energy industry.
ERW black steel pipe plays an important role in the fields of oil and gas transportation, hydropower stations and nuclear power plants because they can withstand high pressure, high temperature and corrosive environments to ensure the safe transportation of oil and gas.
(3)Petrochemical industry.
ERW black steel pipes are widely used in petroleum refining, chemical production, etc. because they have high corrosion resistance, can reduce the loss of chemical substances, and improve industrial production efficiency.
