Changsha Xiangjia Metal Materical Co., Ltd.

ERW steel pipe  is a steel pipe with the weld seam parallel to the longitudinal direction of the steel pipe. ERW steel pipe has a simple production process, high production efficiency, low cost and rapid development.   When choosing raw materials, pay attention to:   1.      According to the quality requirements of the ERW steel pipe produced, reasonably select the steel type, specification, allowable deviation and production method of the required raw materials;   2.      The raw material of ERW steel pipe has no internal and external surface defects;   3.      The packaging of ERW steel pipe is neat and firm, and there is no loose volume and tower shape;   4.      For strips of the same batch of ERW steel pipe, the steel number, heat number and batch number should be distinguished. Changsha Xiangjia Metal Materical Co., Ltd.   the Steel Pipe Division of ADTO GROUP, is one of the leading manufacturers of steel products in China. We specializes in manufacturing all kinds of steel pipe

  1.      Cleaning Use solvent and emulsion to clean the surface of   ERW steel pipe   to remove oil, grease, dust, lubricant and similar organic substances, but it cannot remove rust, oxide scale, welding flux, etc. on the surface of ERW steel pipe, so it is only used in defense operations as an aid.   2.      Pickling Generally, two methods of chemical and electrolytic pickling are used for pickling, and only chemical pickling is used for pipeline anticorrosion, which can remove oxide scale, rust, and old coating. Although chemical cleaning can make the surface achieve a certain degree of cleanliness and roughness, its anchor pattern is shallow and it is easy to cause pollution to the surrounding environment.   3.      Tool rust removal Mainly use tools such as wire brushes to grind the surface of ERW steel pipe, which can remove loose oxide scale, rust, welding slag, etc. The rust removal of hand tools can reach Sa2 level, and the rust removal of power tools can reach Sa3 level. If

1.       The raw materials are strip coil, welding wire and flux. They must pass strict physical and chemical inspections before they are put into operation.   2.       The head and tail of the strip are butted, using single-wire or double-wire submerged arc welding, and active submerged arc welding is used for repair welding after rolling into a steel pipe.   3.       Before forming, the strip is processed by leveling, trimming, planing, surface finishing, transportation and pre-bending.   4.       The electric contact pressure gauge is used to control the pressure of the cylinder on both sides of the conveyor to ensure the smooth transportation of the strip.   5.       Use external control or internal control roll forming.   6.       The welding seam gap control device is selected to ensure that the welding seam gap meets the welding requirements, and the pipe diameter, the amount of misalignment and the welding seam gap are strictly controlled.   7.       Use electric welding machin