understand a wide variety of casting and welding defects that appear on images obtained during images will be compromised. Often, those Non-Destructive Testing (NDT). FILM HANDLING ARTIFACTS While many factors can affect image quality,
Date added: October 2, 2012 - Views: 30
9. Welding Defects 109 A distinction of arising defects by their origin is shown in Figure 9.5. The development of the most important welding defects is explained in the following paragraphs.
Date added: February 20, 2012 - Views: 461
Res. J. Appl. Sci. Eng. Technol., 2(3): 295-301, 2010 297 (a) Slag inclusions (b) Porosity (c) Incomplete penetration Fig. 1: Image after preprocessing
Date added: November 6, 2011 - Views: 47
Detection of Welding Defects using S-TOFD and Digital Image Processing Techniques Ramamoorthi P V Srinivasan R Vijayarekha K Venkataraman B ... used the B-scan images of welded joints to detect the flaws present. The common welding defects include Lack of fusion,
Date added: May 3, 2013 - Views: 15
CLASSIFICATION OF WELDING DEFECTS IN RADIOGRAPHS USING TRAVERSAL PROFILES TO THE WELD SEAM G. X. Padua1, R. R. Silva2, ... we already have the digital radiography available to have these images. The welding seam extraction require an
Date added: December 30, 2011 - Views: 22
Weld Defects in Austenitic Stainless Steel Sheets—Effect of Welding Parameters Defects grow in number and size as welding current increases, and the type of defect is determined by welding speed
Date added: May 3, 2013 - Views: 3
considering defects in weldment images as object of interest. To detect defects in radiographic weldment images, ... important stage is the detection of welding defects which may affect the well functioning of these pieces [1, 2].
Date added: May 23, 2013 - Views: 2
Segmentation of welding defects using a robust algorithm Miguel Carrasco1 and Domingo Mery2* ... of flaws in welding images. This article is organized as follows: Section 2 present the state of the art in flaw detection in welds.
Date added: April 2, 2012 - Views: 14
Discontinuities and Defects Welding on stainless steels can produce the typical weld discontinuities or defects, including the following: † Cracks † Incomplete fusion † Incomplete joint penetration † Overlap † Porosity † Slag inclusions
Date added: February 9, 2012 - Views: 242
Weld assessments •Weldments normally contain defects. However we need to keep weld defects at a minimum level to maintain reliable products. Pressure vessel weld joint heat treatment
Date added: November 6, 2012 - Views: 13
Weldability and defects in weldments Subjects of Interest •Reviews of weld design and weldability •Residual stresses and weld distortion •Weld metal inhomogeneities
Date added: May 18, 2012 - Views: 135
A method for detection welding defects in radiographic images 309 International Journal of Machine Intelligence ISSN: 0975–2927 & E-ISSN: 0975–9166, Volume 3, Issue 4, 2011
Date added: May 16, 2014 - Views: 1
Abstract—This paper describes a novel method for automatic estimation of the contours of weld defect in radiography images. Generally, the contour detection is the first operation which we apply
Date added: December 11, 2013 - Views: 1
ray welding image segmentation in this paper. ... But the images of x-ray imaging system in actual industrial production are often more ... The discussions about identifying defects in images [J]. Nondestructive testing, 2002, (1): 5-8 .
Date added: May 8, 2012 - Views: 8
used for TIG welding stainless steel than for steel, but not all gas mixtures are suitable for all material types, i. e. hydrogen ... the scrapping or repairing of welding defects can be a significant cost and must be avoided.
Date added: May 11, 2013 - Views: 4
A Review on Inspection of welding defects using Segmentation Techniques A.Nirmala , V.Sridevi . ... ographic images with classical level set methods, the propagating front may not be able to capture the real boundaries. The enhanced
Date added: March 8, 2014 - Views: 1
New Jersey Section April Meeting Info —AWS NJ Section News April, 2014— Come out Earn Professional Development Hours Make valuable contacts Gain knowledge
Date added: April 25, 2014 - Views: 2
The Mechanisms of Formation of Weld Defects in High-Frequency Electric Resistance Welding The two kinds of defects associated with previously defined welding
Date added: July 3, 2013 - Views: 4
M.I. Rajab et al. / Application of frequency domain processing to X-ray radiographic images of welding defects 149 X-ray film Fig. 2. Basic arrangement components of the digitizing system.
Date added: October 20, 2014 - Views: 1
CLASSIFICATION OF WELDING DEFECTS IN RADIOGRAPHS USING TRAVERSAL PROFILES TO THE WELD SEAM G. X. Padua 1, ... Wang, G, Li ao, T. W. Automatic Identification of Different Types of Welding Defects in Radiographic Images. NDT&E International 2002; 35: 519-528. 5. R. R.
Date added: July 24, 2013 - Views: 2
Researchers have done extensive work on welding defects evaluation in radiographic testing. Suhaila Abd Halim et al.  ... “Hierarchical Segmentation Approach to Detection of Defects on Welding Radiographic Images”,
Date added: March 15, 2013 - Views: 1
Surface Defects on Rolled Steel Using Computer Vision and Artificial Neural ... X., Wong, B. S., Tan, C. S.: Recognition of Welding Defects in Radiographic Images by Using Support Vector Machine Classifier. Research Journal of Applied Sciences, Engineering and Technology, Vol. 2, No.3 ...
Date added: March 13, 2013 - Views: 19
welding defects in radiographic images by using image processing techniques, including noise reduction, contrast enhancement, thresholding and labeling, were implemented to help in the recognition of weld regions and the detection of weld ...
Date added: August 3, 2013 - Views: 3
Common HF Weld Defects There are many types and variations of HF welding defects and each one is known by many different names around the industry.
Date added: December 11, 2011 - Views: 162
Segmentation of Weld Defects in X-ray Image Based on Partial Surface Reconstruction Runshi HOU, Dong DU, Jiaxin SHAO, Li AW NG, ... Liao T W. Automatic Identification of Different Types of Welding Defects In Radiographic Images[J] ．NDT and E International, 2002, 35(8): 519 ～528.
Date added: February 20, 2012 - Views: 10
Although Radiographic testing is widely used for welding defects, ... Neoteric algorithms have been used for the purpose of weld defects identifications in radiographic images to replace the expert knowledge. The application of artificial neural networks in noise detection of radiographic films ...
Date added: March 17, 2012 - Views: 60
Defects detection in X-ray images and photos ROUMEN KOUNTCHEV Department of Radio Communications Technical University of Sofia ... of welding defects in real-time radiography. Non-Destructive Testing International, V. 23, No. 4, 1990,
Date added: October 12, 2014 - Views: 1
iii Introduction In the construction of such steel structures as buildings and bridges and the fabrication of such machinery as ships, autos, rolling stock, and pressure vessels, arc welding is
Date added: May 27, 2012 - Views: 7
26 Australian Bulk Handling Review: July/August 2009 WELDING DEFECTS Welding defects can greatly affect weld performance and longevity. Having an understanding of the
Date added: February 20, 2012 - Views: 790
Root Welding Defects. Root L.O.F Causes Too small a root gap Arc too long Wrong polarity Electrode too large for joint preparation ... • Poor welding technique A shallow groove caused by contraction in the weld metal along each side of the penetration bead or
Date added: March 9, 2014 - Views: 7
book concentrates on the process of welding and details many of the defects associated with joining processes] E J Pohl (Ed). ... with many Scanning Electron Microscope images of fracture surfaces, wear damage and other surface features.
Date added: April 29, 2012 - Views: 74
Detection of welding defects using a pattern recognition schema ... types of welding defects in radiographic images. NDT&E International, 35(2002):519-528. Enquiry No 310-13 Enquiry No 310-12. Title: Mery Created Date: 9/11/2003 3:22:40 PM ...
Date added: May 11, 2013 - Views: 4
2 1. ABSTRACT: In this paper a new method for automatic recognition and separation between defected radiographic images of welds and correct ones is introduced.
Date added: October 12, 2014 - Views: 1
Characterization of Welding Defects by Digital Image Analysis Charakterisierung von Schweißfeldern mittels digitaler Bildanalyse Romeu R. da Silva, ... images, contribute to limit still more that capaci-ty. The main objective of the computer aided
Date added: November 26, 2013 - Views: 1
428 Carvalho et al. Materials Research 2. Detection and Classification of Welding Defects on Radiographic Images The radiographic image processing is especially used
Date added: March 21, 2012 - Views: 9
Automated Detection of Welding Defects without Segmentation Domingo Mery Pontificia Universidad Catolica de Chile Av. Vicuna Mackenna 4860(143), ... on 10 representative X-ray images yielding a performance of 94% in accuracy using only 14 features and support vector machines.
Date added: May 23, 2013 - Views: 2
radiographic images and analysis of quality of welding. During welding process following nine types of flaws are ... Brian Stephen Wong and Ching Seong Tan,” Recognition of Welding Defects in Radiographic Images by Using Support Vector Machine Classifier” Research Journal of Applied ...
Date added: August 31, 2013 - Views: 2
test other welding defects, lack of fusion and undercut. The results are shown in Figure 11. (a) (b) (c) ... Since the intensity level of defects in the radiographic images are lower than the neighboring regions, therefore, troughs which can be used to
Date added: February 20, 2012 - Views: 18
Radiographics pattern recognition of welding defects using linear classifiers R R da Silva, M H S Siqueira, ... (there are also equipments that generate digital images directly during the test), a stage of the images preprocessing (application
Date added: May 21, 2012 - Views: 12
CLEMEX Welding Analysis Image Analysis Report # 692 ... defects are potentially disastrous, and quality control serves to identify the defect, find the cause, ... 1 Images taken during the procedure are available in appendix A
Date added: May 26, 2013 - Views: 3
controlling different welding defects. The main purpose of this project is omission of the human interference in Visual Test of ... m the images erence model e defects. In m on a section a CCD camera ter the image nd the profile on matrix we f dimensions acted segment
Date added: May 8, 2013 - Views: 2
Welding Defects Speaker: Robert F. Waite, PE, CWI ... Liesl Karel Repoli, Haks Phillip L. Resciniti, Haks. We’ll look forward to seeing you at the meetings. Remember, dinner is complimentary at the first meeting that a new member attends.
Date added: December 22, 2012 - Views: 3
Images of Pressure Vessel Failures An internal non-code weld had weakened the shell of this vessel. ... involving welding and annealing that ... defects, and testing according to the NBIC
Date added: March 24, 2012 - Views: 25
over welding, the EL images of which have been ... mechanism, harm and resolution of those images, then the solution to defects is applied to productive practice of ...
Date added: June 26, 2013 - Views: 1
For instance, adding oxygen and/or carbon dioxide to a shielding gas for MAG welding carbon steel increases its oxidation potential. In general, ... these welds can suffer from greater numbers of fusion defects than those made from gases with higher oxidation potentials.
Date added: May 7, 2013 - Views: 1
without welding defects such as porosity, underfilling or ... The high-speed observation pictures and the X-ray images of the welding phenomena at 360 μm spot diameter and 6 m/min welding speed demonstrated that a sound weld bead was formed owing to a long
Date added: May 4, 2012 - Views: 4
C. REAL-TIME RADIOGRAPHIC IMAGES OF SPECIMENS ..... 144 D. ULTRASONIC TEST RESULTS WITH 3.6 mm PROBE ..... 161 E ... 2.2 TYPICAL DEFECTS DUE TO SPOT WELDING Defects inversly affects the quality of a spot weld. Hence their reasons and
Date added: April 1, 2012 - Views: 25
photos, digital images or X-ray pictures containing different types of welding defects. These images are vital to assess the quality of industrial products. According to the definitions defined by ISO 6520, there are 80 defect types
Date added: December 3, 2013 - Views: 1