ADVANCEMENT OF ULTRASONIC TECHNIQUES USING RERADIATED SOUND ENERGIES FOR NONDESTRUCTIVE EVALUATION OF WELDMENTS
Final technical rept.
AUTOMATION INDUSTRIES INC BOULDER CO RESEARCH DIV
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No single testing method presently exists that will provide a complete nondestructive evaluation of structural welds. An ultrasonic inspection technique called the Delta Technique has been developed. This technique has many advantages over present weld inspection techniques. The Delta Technique is not sensitive to any preferential defect orientation and it can provide a permanent record of the test results. Delta inspections have been conducted successfully for both thick and thin butt welds and various configurations of tee welds. An inspection speed of 50 feet per hour was obtained in the laboratory. This was the maximum operating speed of the laboratory mechanical fixturing system and not the maximum operating speed of the Delta Technique. As a result of this program, we have defined the operating parameters necessary for inspecting butt welds with the Delta Technique. It is possible to assign operating parameters for a butt weld of given thickness in a specific material. Manual and automatic Delta weld inspection techniques have been studied. Each are applicable to inspection of the hull welds used in submarine fabrication. The Delta Technique can provide the Navy with a means for rapid, economical evaluation of butt welds and, potentially, other weld configurations, such as the tee weld.
- Manufacturing and Industrial Engineering and Control of Production Systems
- Test Facilities, Equipment and Methods