JCOE is a type of straight seam double-sided submerged arc welded pipe. LSAW steel pipe can be divided into high-frequency LSAW steel pipe and submerged arc welded LSAW JCOE steel pipe based on the production process. Submerged arc welded straight seam steel pipes are divided into UOE, RBE, JCOE, LSAW steel pipe, etc., based on their different molding methods. The JCOE steel pipe production process is simple, highly efficient, and cost-effective, leading to faster development.
JCOE is a method of molding LSAW steel pipes and is also a type of equipment. In China, GB/T3091-2008 and GB/T9711.1-2008 are commonly used, while the international standard is API-5L. JCOE steel pipes are produced using a double-sided submerged arc welding process and undergo multiple processes such as bending, internal and external welding, straightening, and flattening to meet relevant standards.
JCOE steel pipe is crucial in large-scale pipeline, water and gas transmission, urban pipeline network, steel structure, bridge piling, municipal, and urban construction projects.
The weight formula is [(O.D.-Wall Thickness)*Wall Thickness]*0.02466=kg/m (weight per meter).
Commonly used materials include Q235A, Q235B, 16Mn, 20#, Q345, L245, L290, X42, X46, X70, X80, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, and 0Cr18Ni11Nb.
The internal and external surfaces of JCOE LSAW steel pipe must be smooth. Folding, cracks, delamination, lap welding, arc breaking, burn-through, and other defects with depths exceeding the lower deviation of the wall thickness are not permitted. However, other localized defects with depths not exceeding the lower deviation of the wall thickness are allowed.
The JCOE steel pipe straight seam double-sided submerged arc welded pipe offers several advantages.
Firstly, it is fully automated.
Secondly, it is welded under the submerged arc, which results in stronger heat exchange and protection properties, and higher quality welded products. Thirdly, the welding flux is buried under the arc during submerged arc automatic welding, allowing for use in high current and higher welding efficiency.
The factory produces the pipe in prefabricated sections which are then welded on site using submerged arc welding. This process has been developed into double-wire and multi-wire submerged arc welding, further improving efficiency.
Post time: Dec-05-2023