Failure assessment of Mash Seam Weld breakage and development of online weld inspection system for early detection of weld failure

2021 ◽  
pp. 105967
Author(s):  
Bonikila Pradeep Reddy ◽  
Shivanandan S. Indimath ◽  
Nikhil Shajan
Keyword(s):  
Early Detection ◽  
Inspection System ◽  
Seam Weld ◽  
Weld Failure ◽  
Failure Assessment ◽  
Weld Inspection

The Evaluation of Failure Pressure for Corrosion Defects Within Girth or Seam Weld in Transmission Pipelines

2004 ◽  
Author(s):  
Young-pyo Kim ◽  
Woo-sik Kim ◽  
Young-kwang Lee ◽  
Kyu-hwan Oh
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Limit Load ◽  
The Body ◽  
Element Analysis ◽  
Burst Test ◽  
Corrosion Defect ◽  
Seam Weld ◽  
Failure Assessment ◽  
Corrosion Defects

The failure assessment for corroded pipeline has been considered with the burst test and the finite element analysis. The burst tests were conducted on 762mm diameter, 17.5mm wall thickness and API 5L X65 pipe that contained specially manufactured rectangular corrosion defect. The failure pressures for corroded pipeline have been measured by burst testing and classified with respect to corrosion sizes and corroded regions — the body, the girth weld and the seam weld of pipe. Finite element analysis was carried out to derive failure criteria of corrosion defect within the body, the girth weld and the seam weld of the pipe. A series of finite element analyses were performed to obtain a limit load solution for corrosion defects on the basis of burst test. As a result, the criteria for failure assessment of corrosion defect within the body, the girth weld and the seam weld of API 5L X65 gas pipeline were proposed.

Development of an ultrasonic weld inspection system based on image processing and neural networks

2017 ◽  
Vol 33 (2) ◽  
pp. 229-236 ◽  
Author(s):  
Fernando Roca Barceló ◽  
Pedro Jaén del Hierro ◽  
Fran Ribes Llario ◽  
Julia Real Herráiz
Keyword(s):  
Neural Networks ◽  
Image Processing ◽  
Inspection System ◽  
Weld Inspection

scholarly journals Spatial data analysis for laser scanning based shape error inspection

2021 ◽  
Author(s):  
Haibin Jia
Keyword(s):  
Fourier Transform ◽  
Spatial Data ◽  
Laser Scanning ◽  
Laser Scanner ◽  
Industrial Applications ◽  
Spatial Data Analysis ◽  
Inspection System ◽  
Shape Error ◽  
Shape Errors ◽  
Weld Inspection

Laser scanning, a widely used technology, has been highly developed and adopted in various industrial applications. The methodologies used for scanner date processing are mostly point based. In this thesis, a new approach is presented to analyze spatial data obtained from a 3-D laser scanner for shape error inspection. Different from traditional methodologies, the method proposed in this research is frequency based. The method utilizes the Fourier transform to decompose a 2-D curve or 3-D shape into its spatial components by applying two 1-D FFT (Fast Fourier Transform) on 2-D curves or two 2-D FFT on 3-D shapes. The spatial components including frequency, amplitude, and phase are defined as shape characteristics to represent the shape under inspection. By relating spatial components with GD&T (Geometric Dimensioning and Tolerancing) standards using proper analysis techniques, such as frequency spectrum and cross correlation, shape errors can be detected and characterized. One of the applications of this method is automated inspection. In this research, the spatial data method is applied to MIG (Metal Inert Gas) weld inspection. Experiments are carried out to analyze the 2-D curve of a projection weld data, and the 3-D scanning data directly. A MIG weld inspection system is also developed for production use.

Evaluation of Historical Longitudinal Seam Weld Failures in Grades 11, 12, and 22 Materials

2008 ◽  
Author(s):  
Marvin J. Cohn ◽  
Steve R. Paterson
Keyword(s):  
Hoop Stress ◽  
Seam Weld ◽  
Failure Data ◽  
Weld Failure ◽  
Curve Fit ◽  
Power Utilities ◽  
Term Creep ◽  
Longitudinal Seam ◽  
Grade 11

Since the catastrophic HEP seam weld failures of Mohave (1985) and Monroe (1986), electric power utilities have become more interested in developing and implementing examination and fitness-for-service evaluations of their HEP systems. At least 30 failures or substantial cracks in Grade 11 (1-1/4Cr – 1/2Mo), Grade 12 (1Cr – 1/2Mo) and Grade 22 (2-1/4 Cr – 1Mo) pipe longitudinal seam welds or clamshell welds have occurred from 1979 through 2000. This paper provides a statistical analysis of well-characterized Grade 11, Grade 12, and Grade 22 longitudinal seam weld failures or substantial cracks developed by long term creep rupture damage. Considering several applicable hoop stress parameters, linear regression analyses were performed to minimize scatter about a log stress versus Larson Miller Parameter (LMP) curve fit. Each of six applicable hoop stress equations was evaluated to determine the best fit stress space for the longitudinal seam weld failure data. These service experience industry data include pipe thicknesses ranging from 0.5 to 4.5 inches and failure times ranging from 71,000 to 278,000 hours.

scholarly journals Characterization of slip lines in single edge notched tension specimens

2015 ◽  
Vol 6 (3) ◽  
pp. 7 ◽  
Author(s):  
Filip Van Gerven ◽  
Wim De Waele ◽  
Diego Belato Rosado ◽  
Stijn Hertelé
Keyword(s):  
Slip Line ◽  
Base Material ◽  
Heterogeneous Structure ◽  
Single Edge ◽  
Element Analysis ◽  
Weld Failure ◽  
Failure Assessment ◽  
Line Theory ◽  
Line Patterns ◽  
The Impact

The application of slip line analysis in weld failure assessment has not gained much attention to date. The presented research aims to predict slip line patterns taking into account the complex heterogeneous structure of the weld. A preliminary study based on Single Edge Notched Tension (SENT) test results sampling pure base material, i.e. not containing any welds is conducted to assess the impact of side grooves on slip line behaviour and to validate slip line theory and finite element analysis.

Inspection Considerations for Deepwater Thick-Walled Riser Systems

2008 ◽  
Author(s):  
Jonathan Bowman ◽  
Hugh Thompson ◽  
Donald Stevens ◽  
James Crane
Keyword(s):  
Fatigue Loading ◽  
Thick Wall ◽  
Inspection System ◽  
Acceptance Criteria ◽  
Adequate Knowledge ◽  
Inspection Process ◽  
Engineering Requirement ◽  
Weld Inspection ◽  
Girth Welds ◽  
The Impact

The fatigue loading on deepwater risers results in the need to impose very tight weld acceptance criteria for pipe alignment and flaw sizes. The production of high-pressure, high-temperature reservoirs calls for increasingly thick-walled riser systems. The combination of thicker wall pipe and the maintenance of tight flaw acceptance criteria challenges automated ultrasonic testing (AUT) which is the primary method of riser weld inspection. An understanding of the limitations of the weld inspection system must be determined and accommodated as part of the engineering process and in conjunction with adequate knowledge of the pipe end dimensions can help optimize the inspection process. This paper discusses the challenges associated with the preparation for and inspection of thick-walled riser system welds and the impact this can have on the system design and engineering requirement. In support of the discussion an overview of a recent study to determine the detect-ability and sizing accuracy of an AUT system with thick-wall pipe girth welds is presented. The qualification program is based upon the AUT inspection of seeded defect welds which are subsequently cut into weld rings, re-inspected with an immersion scan and sectioned to determine the size of the flaws present. All AUT inspections are performed under similar conditions to the inspection of the production welds (i.e., no prior knowledge of the nature of the seeded welds).

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