Development of Reference Raiographs for Aluminum Welds

Period of Performance: 09/01/1989 - 12/01/1991

$400K

Phase 2 SBIR

Recipient Firm

Industrial Quality, Inc.
640 E. Diamond Avenue, Suite C
Gaithersburg, MD 20877
Principal Investigator

Abstract

A STANDARD DOCUMENT OF GRADED REFERENCE RADIOGRAPHS OF ALUMINUM WELDS IS NEEDED TO MINIMIZE INTERPRETATION PROBLEMS RELATED TO THE ACCEPTANCE OF ALUMINUM WELDS IN MILITARY AND CIVILIAN STRUCTURES. THE REFERENCE RADIOGRAPHS WILL ALLOW THE PRODUCER AND THE BUYER TO AGREE ON A GIVEN GRADED REFERENCE RADIOGRAPH AS AN ACCEPTANCE QUALITY LEVEL AND WILL ALSO AID THIRD PARTY OBSERVERS TO AUDIT AND EVALUATE THE WELD QUALITY LEVEL PRODUCED. THE PROGRAM OBJECTIVE IS TO DEVELOP SETS OF GRADED REFERENCE RADIOGRAPHS FOR ALUMINUM WELDS (5000 TO 6000 SERIES ALLOYS) IN THE THICKNESS RANGES 0 TO 9.5m (.375 INCH) AND 9.5 TO 19mm (.375 TO .75 INCH). THE DOCUMENTS WILL INCLUDE TRANSPARENCY REPRODUCTIONS OF WELD RADIOGRAPHS AND TEXT DESCRIBING THE WELDS AND DISCONTINUITIES. FAULTED WELDS WILL BE PREPARED TO BACK UP THE STANDARD DOCUMENTS. WELD DISCONTINUITIES WILL INCLUDE FIVE GRADES EACH OF FINE SCATTERED POROSITY, COARSE SCATTERED POROSITY AND LINEAR POROSITY, THREE GRADES OF CLUSTERED POROSITY, TWO ILLUSTRATIONS EACH OF INADEQUATE PENETRATION AND TUNGSTEN INCLUSION AND EXAMPLES OF LONGITUDINAL, TRANSVERSE, AND CRATER CRACKS, LACK OF FUSION AND UNDERCUT. DILIGENT EFFORTS WILL BE MADE TO OBTAIN CONSENSUS STANDARDS THROUGH A PROFESSIONAL SOCIETY SUCH AS ASTM OR AWS.