... Abstract Reliability of the Butt-Fusing Welding (BFW) joint of High-Density Polyethylene (HDPE) pipes is highly affected by the given parameters of Fusion Procedure Specification (FPS). Due to the operational effect, machine process capability and the impact of environment & climate...

... of the welds and to balance toughness, tensile and hardness properties required by the severe service condition. This paper aims at summarizing some technical data on high strength carbon steel SA-537 class 2 and low-alloy steel SA-533 type C class 2. A case study will illustrate the weight savings that can...

... Abstract Artificial Intelligence (AI) has been applied to accelerate the analysis of outputs from the phased-array ultrasonic (PAUT) non-destructive testing (NDT). The aim of this work is the development and analysis of AI tools for the output processing of PAUT applied to welding defects...

... input welding operation like submerged arc welding (SAW) is the crucial area for failure during the application of welded structure. Large detrimental changes occur in mechanical behavior and microstructural characteristics of HAZ due to thermal cycles of the welding operation. In this study, CGHAZ...

... has complex microstructure and requires careful control of welding parameters to assure crack free welds that provide adequate creep ductility and retain creep strength at high temperatures. The current guidelines documented in API 582 and Technical Report 938 provide limited insights on success...

... material. The butt joint had been operating for the same period of 200,000 hours, same temperature of 528°C at almost a half pressure (0.46 Kg/mm 2 vs. 1.06 Kg/mm 2 ). X-ray diffraction (XRD) technique applied close to the weld highlighted anomalously high stress-level on the outer surface for all four...

... Abstract Previous study carried out residual stress characterization for the welds of the high-temperature-section (superheater / reheater) lower headers of the bottom-supported heat-recovery steam generator (HRSG). Modeling the gas-tungsten arc, manual welding process considered only weld-lay...

... Abstract Liquid penetrant testing (PT), magnetic particle testing (MT) and ultrasonic testing (UT) have been used as nondestructive testing methods for the welded tubular joints of reactor cooling systems. The PT and the MT that are applied to the surface test of the specimen have been...

... Abstract Residual stresses resulting from welds are a key consideration in the design and assessment of piping and pressure vessels. As welding is a variable process, the resulting variability in weld residual stress should be accounted for in design and assessment. This paper investigates...

... The integrity of structures in nuclear power plants has to be assessed to meet given safety criteria. For a better understanding of the in-service loads in welded areas of PWRs components, the residual stresses resulting from the welding process have to be estimated. For that purpose, numerical...

... The implementation of a semi-empirical solid-state phase transformation subroutine in the ABAQUS finite element package is presented to predict the influence of transformation strain on the post-weld residual stress field in ferritic steels. The phase transformation subroutine has been outlined...

... EFFECT OF POST-WELD HEAT TREATMENT ON THE PLASTIC BUCKLING OF WELDED CYLINDRICAL SHELLS Ji Wang; Zhiping Chen; Chulin Yu Institute of Process Equipment, Zhejiang University Hangzhou, P. R. China Tel: 86-571-87953007 Email: zhiping@zju.edu.cn ABSTRACT Storage tanks, silos and other welded...

... indicated that the exposure to H 2 significantly reduces the fracture toughness of 4340 high strength steels by up to 50 percent. Furthermore, SNTT tests conducted in air demonstrated a significant fracture toughness reduction in samples subject to simulated welding heat treatment using a Gleeble machine...

... The numerical application of solid-state phase transformation kinetics relating to conventional welding of ferritic steels is presented. The inclusion of such kinetics in weld models is shown to be necessary for capturing the post-weld residual stress field. To this end, a comparison of two...

... 14 01 2011 Large welded steel tanks for oil storage (oil tank for short in following text) are usually constructed by welding together several varying thickness cylindrical shells. The generated welding residual stress and deformation may affect the buckling behavior of oil tanks...

... 21 08 2009 This paper explores the use of state-of-the-art instruments such as neutron and synchrotron diffraction for evaluation of residual stress in carbon steel welded components. The study shows significant variation in transverse residual strain/stress distribution across...

... 24 07 2009 In this research the neutron diffraction technique was used to investigate the residual stress distributions in carbon steel components with weld repairs. Two full penetration weld repairs were studied using a) the stringer bead and b) the temper bead weld techniques in 25...

... 04 08 2008 Duplex stainless steels (DSS) are finding increased application on offshore process plants in Brazil. Welding them is always a challenge. Pure argon and argon/low-nitrogen gas mixtures are available for welding them with GTAW process. The use of the same kind of gases...

... 04 08 2008 Welding residual stresses have important consequences on the performance of engineering components. High residual stresses lead to loss of performance in corrosion, fatigue and fracture but as yet these consequences are poorly quantified. The major cause...

... 04 08 2008 Alloy 22 (N06022) has been extensively tested for general and localized corrosion behavior both in the wrought and annealed condition and in the as-welded condition. The specimens for testing were mostly prepared from flat plates of material. It was important to determine...