Research on deformation characteristics of JCOE forming in large diameter welding pipe

2016 ◽  
Vol 4 (3) ◽  
pp. 268-277 ◽  
Author(s):  
Li-Feng Fan ◽  
Jia-Xin Yan ◽  
Ying Gao ◽  
Jian-Bin Yun
Keyword(s):  
Large Diameter ◽  
Deformation Characteristics ◽  
Welding Pipe

Analysis of Crimping of Large Diameter Welding Pipe

2014 ◽  
Vol 997 ◽  
pp. 517-521
Author(s):  
Li Feng Fan ◽  
Ying Gao ◽  
Jian Bin Yun ◽  
Lin Feng Dong
Keyword(s):  
Analytical Model ◽  
Large Diameter ◽  
Forming Process ◽  
Technical Parameters ◽  
Polynomial Curve ◽  
Welding Pipe ◽  
X80 Steel ◽  
Polynomial Curve Fitting ◽  
Effective Path ◽  
Submerged Arc

Crimping is widely used in production of large diameter submerged-arc welding pipes. Traditionally, the designers obtain the technical parameters for crimping from experience or trial-errors by experiments. To tackle this problem, a theoretical analytical model is proposed to analysis crimping forming process. In this paper, taking the crimping of X80 steel Φ1219mm×22mm×12000mm welding pipe for instance, the theoretical analytical model is constructed by quadratic polynomial curve fitting technique and mechanics theory. And it is verified by a comparison with experiment results. Thus, the presented model of this research provides an effective path to design crimping parameters.

scholarly journals Ultimate Load Tests on Bearing Behavior of Large-Diameter Bored Piles in Weathered Rock Foundation

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Xiaoyu Bai ◽  
Xueying Liu ◽  
Mingyi Zhang ◽  
Yonghong Wang ◽  
Nan Yan
Keyword(s):  
Bearing Capacity ◽  
Limit State ◽  
Large Diameter ◽  
Diameter Ratio ◽  
Load Test ◽  
Single Pile ◽  
Rock Foundation ◽  
Deformation Characteristics ◽  
Lateral Resistance ◽  
Bored Piles

Based on the vertical compressive static load test and pile mechanics test of three large diameter bored piles (one of the test piles was treated with postgrouting) in granite gneisses foundation, the bearing capacity, deformation characteristics, and influencing factors of the single pile under the limit state are analyzed and compared with the recommended values of survey report and the recommended values of current codes. By comparing the measured and theoretical values of pile axial force, the bearing capacity of cast-in-place pile under normal and limit conditions is analyzed. The experimental results show that the Q-s curve of large-diameter rock-socketed mud wall retaining bored pile with a length-diameter ratio of 25–33 and rock-socketed depth of 5–8 d shows a rapid growth. After grouting treatment, the ultimate compressive bearing capacity of single pile is improved, the maximum settlement is reduced by 6.6%, the rebound rate is reduced by 11.1%, and the settlement effect of controlling pile top is not significant. The bearing capacity and deformation characteristics of the three test piles are less affected by length-diameter ratio and rock-socketed depth. For postgrouting piles, the ratio of frictional resistance of rock-socketed segment and the ratio of pile lateral resistance are less affected by length-diameter ratio and rock-socketed depth, while, for postgrouting piles, the ratio of pile lateral resistance is more affected by rock-socketed depth. The pile end resistance ratio of the three test piles is significantly affected by the rock-socketed depth, whether or not the pile side postgrouting treatment is carried out.

Deformation Characteristic Analysis on Air Bending in JCO Forming of Large Diameter Welding Pipe

2014 ◽  
Vol 623 ◽  
pp. 113-116
Author(s):  
Li Feng Fan ◽  
Ying Gao ◽  
Jia Xin Yan ◽  
Jian Bin Yun
Keyword(s):  
Finite Element ◽  
Large Diameter ◽  
Deformation Characteristic ◽  
Characteristic Analysis ◽  
Forming Process ◽  
Forming Quality ◽  
Air Bending ◽  
Welding Pipe ◽  
X80 Steel ◽  
Submerged Arc

JCO forming is one of manufacture mode widely used in production of large diameter submerged-arc welding pipes, in which JCO forming process is progressive multi-step air bending. In order to improve JCO forming quality, it is necessary to analysis deformation characteristic of air bending. So, air bending is analyzed using finite element method. Taking the air bending of X80 steel Φ1219mm×22mm×12000mm welding pipe for instance, the air bending is simulated by finite element (FE) code ABAQUS. In this paper, the simulation data is validated by experiments and a comparison showed a good agreement with experiments results. The stress/strain from simulation is discussed. Thus, the results of research provides a basis to improve JCO forming quality.

Quality control on crimping of large diameter welding pipe

2012 ◽  
Vol 25 (6) ◽  
pp. 1264-1273 ◽  
Author(s):  
Lifeng Fan ◽  
Ying Gao ◽  
Qiang Li ◽  
Hongshen Xu
Keyword(s):  
Quality Control ◽  
Large Diameter ◽  
Welding Pipe

Effects of Mould on Crimping of Large Diameter Welding Pipe

2014 ◽  
Vol 623 ◽  
pp. 129-132
Author(s):  
Jia Xin Yan ◽  
Jian Bin Yun ◽  
Li Feng Fan
Keyword(s):  
Finite Element ◽  
Arc Welding ◽  
Large Diameter ◽  
Forming Process ◽  
Simulation Data ◽  
Welding Pipe ◽  
X80 Steel ◽  
Submerged Arc ◽  
Good Agreement

Crimping is widely used in production of large diameter submerged-arc welding pipes. In crimping process, mould is one of the main factors which influences the quality of forming and should be considered at the stage of designing the forming die and process. So, Effects of mould on crimping is researched using finite element method. Taking the crimping of X80 steel Φ1219mm×22mm×12000mm welding pipe for instance, the crimping forming process is simulated by finite element (FE) code ABAQUS. In this paper, the simulation data is validated by product and a comparison showed a good agreement with product results. The stress/strain from simulation is discussed. Thus, the results of research provides a basis to choose mould.

Effects of Simulation Parameters on Springback in Air Bending of JCO Forming

2014 ◽  
Vol 623 ◽  
pp. 117-120 ◽  
Author(s):  
Li Feng Fan ◽  
Ying Gao ◽  
Jia Xin Yan ◽  
Jian Bin Yun
Keyword(s):  
Finite Element ◽  
Arc Welding ◽  
Large Diameter ◽  
Submerged Arc Welding ◽  
Forming Process ◽  
Air Bending ◽  
Welding Pipe ◽  
X80 Steel ◽  
Simulation Parameters ◽  
Submerged Arc

JCO forming is one of manufacture mode widely used in production of large diameter submerged-arc welding pipes, in which JCO forming process is progressive multi-step air bending. In order to improve JCO forming quality, it is necessary to predict springback of air bending. In this paper, air bending is simulated using finite element method, but simulation parameters directly affected prediction precision. So, taking the air bending of X80 steel Φ1219mm×22mm×12000mm welding pipe for instance, the air bending is simulated by finite element (FE) code ABAQUS. The effects of simulation parameters on springback is discussed. Thus, the results of research provides a basis to improve prediction precision of springback in air bending of JCO forming.

Multi-objective optimization of crimping of large-diameter welding pipe

2015 ◽  
Vol 22 (7) ◽  
pp. 2540-2548 ◽  
Author(s):  
Li-feng Fan ◽  
Ying Gao ◽  
Jian-bin Yun ◽  
Zhi-peng Li
Keyword(s):  
Large Diameter ◽  
Multi Objective Optimization ◽  
Multi Objective ◽  
Welding Pipe

Analysis of the Bearing and Deformation Characteristics for Large Diameter Pile

2014 ◽  
Vol 1021 ◽  
pp. 79-82
Author(s):  
Dong Xiao Zhang
Keyword(s):  
Elastic Deformation ◽  
Static Load ◽  
Large Diameter ◽  
Load Test ◽  
Deformation Characteristics ◽  
Static Load Test ◽  
Sediment Compaction ◽  
Side Friction

Base on the static load test curves of large diameter pile, the process of pile top and bottom settlement have been studied, together with deep analysis of bearing and deformation characteristics. The study shows that side friction play before end resistance, steep fall of curves caused by sediment compaction is a sign of pile side friction to the limit; pile material occurs elastic deformation in the process of loading.

Deformation Characteristic Analysis on Mechanical Expanding of Large Diameter Welding Pipe

2014 ◽  
Vol 623 ◽  
pp. 125-128 ◽  
Author(s):  
Li Feng Fan ◽  
Ying Gao ◽  
Jia Xin Yan ◽  
Jian Bin Yun
Keyword(s):  
Finite Element ◽  
Large Diameter ◽  
Deformation Characteristic ◽  
Characteristic Analysis ◽  
Forming Process ◽  
Welding Pipe ◽  
X80 Steel ◽  
Welded Pipe ◽  
Submerged Arc ◽  
Good Agreement

Mechanical expanding is widely used in production of large diameter submerged-arc welding pipes. To improve welded pipe quality, it is necessary to analysis deformation characteristic of mechanical expanding forming process. So, mechanical expanding is analyzed using finite element method.. Taking the expanding of X80 steel Φ1219mm×22mm×12000mm welding pipe for instance, the mechanical expanding forming process is simulated by finite element (FE) code ABAQUS. In this paper, the simulation data is validated by experiments and a comparison showed a good agreement with experiments results. The deformation characteristic of mechanical expanding is discussed. Thus, the result of research provides a basis to improve welded pipe quality.

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