Please Like our Facebook Page Factors affecting the interpretation of test results: Type of materials being welded. Discontinuities in Gas Metal Arc Welds (GMAW). This is the result of gas attempting to escape while the metal is still in a liquid state and is called wormhole porosity. The TIG method of welding produces a clean homogeneous weld which when radiographed is easily interpreted. The following material was developed to help students develop an understanding of the types of defects found in weldments and how they appear in a radiograph. 20 Radiographìc Film Interpretation of Weldments - Student Manual - 1996 Radìographic examination performed in accordance with a general C0de(s) or Specificafioms) Development of a specific project o radiographic examìnation e Specific _ Radio graphic T echrii a ues Figure G-14. Introduction to Radiography 2. Practical training and examination. •The part will stop some of the radiation where thicker and … Evaluation of the relevant features of welding defects in. The following discontinuities are most commonly found in GMAW welds. Offset or mismatch are terms associated with a condition where two pieces being welded together are not properly aligned. Radiographic Testing Page 3 Introduction: BASIC RADIOGRAPHIC TESTING Radiographic testing usually requires exposing film to X rays or gamma rays that have penetrated a specimen, processing the exposed film, and interpreting the resultant radiograph. Type of weld and joint preparation. PDF | On Jan 1, 2009, I.J. to detect anomalies in materials and human bodies. Radiography Testing Presentation SlideShare. Radiography is the first of the modern sophisticated methods of non-destructive testing (dating, back to 1895), has led hundreds of industries to put great confidence in the information that it, ADVANTAGES AND LIMITATIONS OF RADIOGRAPHIC TESTING. TYPE. The AWS program will provide for a portable, individual certification, independent of employer. In addition to producing high quality radiographs, the radiographer must also be skilled in radiographic interpretation. FILM RADIOGRAPHIC IMAGING MEASURED THROUGH SENSITIVITY ffRAST* DEFINITION IMAGE QUALITY INTENSITY ... anced Interpretation and Quantitative luation for d quality, sheath spacing, uniformity of ... Materials Evaluation, May 2007 NDARD PRACTICES FOR ROBUST ASSURANCE . The arc does not melt the base metal sufficiently and causes the slightly molten puddle to flow into the base material without bonding. The dark, straight line is caused by the failure of the weld metal to fuse with the land area. 13. Geometric-exposure, requirements make it impracticable to use radiographic testing on specimens of complex geometry. The following discontinuities are unique to the TIG welding process. Cracks can sometimes appear as "tails" on inclusions or porosity. Radiography Testing Presentation 1. Radiographic interpreter asnt level ii ikbal m yos. Often lumps of metal sag through the weld, creating a thick globular condition on the back of the weld. Radiograph Interpretation - Castings The major objective of radiographic testing of castings is the disclosure of defects that adversely affect the strength of the product. Some of the advantages of radiographic testing as a quality assurance procedure are as follows: b. Radiography today is one of the most important, most versatile, of all the nondestructive test, methods used by modern industry. Discontinuities are interruptions in the typical structure of a material. The ability of an individual to detect discontinuities in radiography is also affected by the lighting condition in the place of viewing, and the experience level for recognizing various features in the image. Radiographic Image Quality, Sensitivity, Contrast, Densities, and Latitude (*Radiograph Image Quality, IQI’s, Markers, Identification, and other requirements) 3. Slag inclusions are nonmetallic solid material entrapped in weld metal or between weld and base metal. Weld Defect 3 – Slag inclusion AXIS Inspection Group Ltd. Kalkars NDT Services RADIOGRAPHIC FILM INTERPRETATION. WHAT IS RADIOGRAPHIC TESTING PDF DOWNLOAD WHAT IS RADIOGRAPHIC TESTING PDF READ ONLINE PDF Drive is your search engine… Introduction History Present State Future Direction, Physics of Radiography Nature of Penetrating Radiation X-rays Gamma Rays Activity Decay Rate   -Carbon 14 Dating Ionization Inverse Square Law Interaction of RT/Matter Attenuation Coefficient Half-Value Layer Sources of Attenuation   -Compton Scattering Geometric Unsharpness Filters in Radiography Scatter/Radiation Control Radiation Safety, Equipment & Materials X-ray Generators Radio Isotope Sources Radiographic Film Exposure Vaults, Techniques & Calibrations Imaging Consideration Contrast Definition Radiographic Density Characteristic Curves Exposure Calculations Controlling Quality Film Processing Viewing Radiographs Radiograph Interp-Welds Radiograph Interp - Castings, Advanced Techniques Real-time Radiography Computed Tomography XRSIM. preventing accidents and saving lives; and has been beneficial for the user. There are many variables in these procedures and successful completion of any test is dependent upon understanding and control of the variables. This video will give greater knowledge of Radiographic Film Defects Interpretation. Why attend this course? Visual acuity is the ability to resolve a spatial pattern in an image. Radiograph Interpretation - Welds. In the radiographic image it appears as a dark irregular line offset from the centerline of the weldment. Radiographic Film Interpretation: Refresher / Recertification. Radiographic testing provides a permanent record in the form of a radiograph and provides a highly sensitive image of the internal structure of the material. Refer to ASME Sec VIII, Div. Since the RT-D training has to cover different digital techniques, the following recommendations were submitted to CEN TC 138 recently: - Digital Radiographic Testing (RT-D) consists of the following digital techniques: - Film digitization; The following discontinuities are typical of all types of welding. Knowledge is Power and understanding the RT Process for the proper interpretation of radiographs can mean the difference between acceptable and catastrophic results.