Title: Finite element analysis of JCO forming process for longitudinal seam submerged arc welded pipes

Authors: Ying Gao, Qiang Li, Lifeng Fan

Addresses: College of Mechanical Engineering, Yanshan University, Qinhuangdao Hebei 066044, China; College of Material Science and Engineering, Hebei University of Science and Technology, Shijiazhuang Hebei 050018, China. ' College of Mechanical Engineering, Yanshan University, Qinhuangdao Hebei 066044, China; College of Material Science and Engineering, Hebei University of Science and Technology, Shijiazhuang Hebei 050018, China. ' College of Mechanical Engineering, Yanshan University, Qinhuangdao Hebei 066044, China

Abstract: This paper presents a study of spring-back in the JCO forming process for welded pipe with diameter 1067 mm, wall thickness of 19.1 mm of X70 based on the plate bending theory by the method of FEM analysis combining with production practice. The true stress-true strain curve from a tensile test is used as the material description. Springback has been studied for five different bending angles of varying punch displacement. The results from the simulations compared with those from practical production, good correlation being achieved. The work shows that the finite-element method can be used to predict JCO geometry. The relationship between punch displacement, the bending angle under loading and after springback, and springback angle is deduced and can be used to optimise process parameters and guide the production practice.

Keywords: finite element analysis; FEA; JCO forming; springback; bending angles; longitudinal seam SAW; submerged arc welding; welded pipes; modelling; stress; strain; tensile testing; simulation; punch displacement.

DOI: 10.1504/IJMIC.2010.037036

International Journal of Modelling, Identification and Control, 2010 Vol.11 No.3/4, pp.239 - 249

Available online: 21 Nov 2010 *

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