ERW is a general term for resistance welded steel pipes. Straight seam high-frequency resistance welding pipe (Electric Resistance Welding, referred to as ERW) ERW is the first letter of the corresponding English word. Resistance welded steel pipes are divided into two forms: AC welded steel pipes and DC welded steel pipes.
AC welding is divided into low frequency welding, medium frequency welding, super medium frequency welding and high frequency welding according to the frequency. High-frequency welding is mainly used for the production of thin-walled steel pipes or ordinary-walled steel pipes. High-frequency welding is divided into contact welding and induction welding.
DC welding is generally used for small diameter steel pipes.
Therefore, in summary, high-frequency welded pipe is included in ERW welded pipe, which is a kind of ERW welded pipe produced by high-frequency welding process. ERW straight seam welded pipe is a steel pipe with advanced product performance, leading quality and relatively economical performance in the field of oil and gas storage and transportation.
Our company has advanced pipe making equipment and complete testing equipment. The main line uses the imported EFD company WELDACG2600KW solid-state high-frequency welding machine. The online flaw detection uses the advanced AS-200 UT authoritative equipment produced in Tel Aviv, Israel. The transmission part adopts excellent facilities from Germany. The water pressure detection equipment adopts foreign advanced automatic control systems. The maximum test pressure can reach 75Mpa. The products strictly comply with GB/T3091-2001, GB/T9711.1-1997, GB/T9711.2-1999 and American Petroleum Institute standards APIspec5CT, 5L standards, using hydraulic testing, ultrasonic online flaw detection, eddy current flaw detection, physical and chemical testing and other comprehensive Advanced testing methods ensure the reliability and stability of ERW steel pipe quality. The main specifications of the ERW straight seam high-frequency welded pipes produced and operated by our company are ∮17-∮630. The ERW steel pipe materials are: Q235-Q345, 20#, J55, X42-X65. At the same time, the following special specifications 102, 108 can also be customized. 121, 127, 133, 140, 152, 159, 165, 168, 180, 194, 203, 245, 299, 351. Its products are used in petroleum, natural gas, city gas, pipeline networks, chemical industry, electric power, steel structure grids, water and gas transportation and other fields, and are widely used in various pressure pipelines.
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