WHAT MAKES A GOOD WELD...AND RADIOGRAPHY CAN PROVE IT

THE WELDING PROCESS AND BASIC ASPECTS OF RADIOGRAPHY ARE BRIEFLY COVERED AS AN INTRODUCTION TO THE PRESENTATION OF THE RADIOGRAPHIC NUMBER INSPECTION TECHNIQUE. THIS DISCUSSION IS LIMITED TO ONLY ALUMINUM AND STEEL. A RADIOGRAPH IS DESCRIBED AS A SHADOW PICTURE OF AN OBJECT PLACED IN THE PATH OF AN X-RAY BEAM: THE FORMING OF AN IMAGE IS INFLUENCED BY THE RELATIVE POSITIONS OF THE OBJECT AND THE FILM, THE DIRECTON OF THE BEAM, AND THE SIZE OF THE SOURCE. THE FOLLOWING CONDITIONS ARE REQUIRED: (1) THE SOURCE OF X-RAYS SHOULD BE AS FAR FROM THE OBJECT AS PRACTICABLE, (2) THE SOURCE OF X-RAYS SHOULD BE AS SMALL AS POSSIBLE, (3) THE RECORDING SURFACE OR FILM SHOULD BE AS CLOSE TO THE OBJECT AS POSSIBLE, (4) THE X-RAYS SHOULD BE DIRECTED PERPENDICULAR TO THE RECORDING SURFACE, AND (5) THE PLANE OF THE OBJECT AND RECORDING SURFACE SHOULD BE PARALLEL. PENETRAMETERS ARE USED TO CHECK ON THE ADEQUACY OF RADIOGRAPHIC TECHNIQUE; IF THE OUTLINE OF THE PENETRAMETER IS SHOWN CLEARLY IN THE RADIOGRAPH, PARTICULARLY CONTRAST AND SHARPNESS OF OUTLINE, THE TECHNIQUE IS CONSIDERED SATISFACTORY. SINCE AN INSPECTION PROGRAM IMPLIES THAT STANDARDS HAVE BEEN ESTABLISHED FOR JUDGING THE MANY ASPECTS OF THE WELDED COMPONENT, IT IS REASONABLE TO ASSUME THAT THE REFERENCE STANDARDS AND THE EXAMPLES OF FAILURES SHOWN ARE DERIVED FROM FOLLOWING CORRECT AND INCORRECT PROCEDURES. SITUATIONS COVERED PHOTOGRAPHICALLY DEAL WITH RADIOGRAPHIC PROCEDURES FOR PARTIAL PENETRATION WELD JOINT DESIGNS, INCOMPLETE PENETRATION IN ALUMINUM AND STEEL WELDS, RADIATION ANGLES FOR TWO TYPICAL WELD JOINT DESIGNS, GAS CAVITIES IN ALUMINUM WELDS, LACK OF FUSION IN ALUMINUM AND STEEL WELDS, INGRADED CONDITIONS IN ALUMINUM WELDS, AND POROSITY - FINE, COARSE, LINEAR, CLUSTERED, SCATTERED - IN STEEL WELDS.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00255327
• Authors:
  • Buckrop, R L
• Publication Date: 1972-5

Media Info

• Features: Figures; Tables;
• Pagination: p. 25a-31a
• Serial:
  • Materials Evaluation
  • Volume: 30
  • Issue Number: 5
  • Publisher: American Society for Nondestructive Testing
  • ISSN: 0025-5327

Subject/Index Terms

• TRT Terms: Aluminum; Inspection; Penetrometers; Radioactivity; Radiography; Standards; Steel; Welding; X rays
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00217207
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 5 1972 12:00AM