Study on the Load-bearing Capacity of X80 Submerged Arc Welded Joints Based on Finite Element Model
DOI:
https://doi.org/10.53469/wjimt.2025.08(03).08Keywords:
X80 pipeline steel, Welded joints, Load-bearing capacity, Finite element analysisAbstract
As the petroleum industry continues to expand rapidly, X80 pipeline steel has become a key material in oil and gas transportation due to its strength and durability. However, welding joints, a critical part of these pipelines, sometimes lack sufficient load-bearing capacity, leading to structural failures. Ensuring the mechanical integrity of these joints is essential for the safe and efficient operation of pipelines. This study employs ABAQUS finite element analysis to assess the performance of welded joints created using submerged arc welding (SAW) and gas metal arc welding (GMAW). By developing 3D models, the study simulates tensile testing, revealing that as displacement increases, the tensile force rises, causing plastic deformation. Necking occurs near the heat-affected zone in the base metal, eventually leading to fracture.
Furthermore, internal pressure simulations show that as pressure builds, the highest stress concentration appears on the inner wall of the welded joints, emphasizing the importance of weld strength in high-pressure environments. By visually demonstrating the mechanical behavior of different welding techniques, this study provides valuable insights for improving welding processes in X80 pipeline steel. The findings serve as a theoretical foundation for optimizing pipeline construction and ensuring long-term structural safety in real-world applications.
References
Xia S, Zhang F, Yang Z. Cyclic deformation behaviours of 18Mn3Si2CrNiMo multiphase (martensite/bainite/retained austensite) steel[J]. Materials Science and Engineering A, 2019, 744: 64-73.
Bastola A, Wang J, Shitamoto H, et al. Investigation on the strain capacity of girth welds of X80 seamless pipes with defects[J]. Engineering Fracture Mechanics, 2017, 180: 348-365.
Chen X W, Qiao G Y, Han X L, et al. Effects of Mo, Cr and Nb on microstructure and mechanical properties of heat affected zone for Nb-bearing X80 pipeline steels[J]. Materials & Design, 2014, 53: 888-901.
Zheng Y, Zhang L, Shi Q, et al. Effects of hydrogen on the mechanical response of X80 pipeline steel subject to high strain rate tensile tests[J]. Fatigue & Fracture of Engineering Materials & Structures, 2020, 43(4): 684-697.
Li L, Yang Y H, Xu Z, et al. Fatigue crack growth law of API X80 pipeline steel under various stress ratios based on J-integral[J]. Fatigue & Fracture of Engineering Materials & Structures, 2014, 37(10): 1124-1135.
Zhao Z P, Qiao G Y, LIi G P, et al. Fatigue properties of ferrite/bainite dual-phase X80 pipeline steel welded joints[J]. Science and Technology of Welding and Joining, 2017, 22(3): 217-226.
Zhao Z P, Qiao G Y, Tang L, et al. Fatigue properties of X80 pipeline steels with ferrite/bainite dual-phase microstructure[J]. Materials Science and Engineering A, 2016, 657: 96-103.
Turichin G, Kuznetsov M, Pozdnyakov A, et al. Influence of heat input and preheating on the cooling rate, microstructure and mechanical properties at the hybrid laser-arc welding of API 5L X80 steel[J]. Procedia CIRP, 2018, 74: 748-751.
Xie Z Y, Qiao G Y, Zhao Z P, et al. STUDY ON FATIGUE PERFORMANCE OF WELDED HEAT-AFFECTED ZONE IN X80 STRAIN-BASED DESIGN PIPELINE STEEL [J]. WELDED PIPE, 2017, 40(05): 19-23.
Midawi A R H, Santos E B F, Huda N, et al. Microstructures and mechanical properties in two X80 weld metals produced using similar heat input[J]. Journal of Materials Processing Technology, 2015, 226: 272-279.
De Sousa L A, De Sousa L F G, Fonseca M C. Characterization of mechanical properties and residual stress in API 5L X80 steel welded joints[J]. Journal of Materials Engineering and Performance, 2018, 27(1): 124-137.
Kim Y, Kim C, Kim W, et al. Fatigue crack growth behavior for welded joint of x80 pipeline steel[C]. Advanced Nondestructive Evaluation II. 2009, 318-323.
Chen X W, Qiao G Y, Han X L, et al. Effects of Mo, Cr and Nb on microstructure and mechanical properties of heat affected zone for Nb bearing X80 pipeline steels[J]. Materials and Design, 2014 (53): 888-901.