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Nondestructive Evaluation of Tubing Closure Welds

Published online by Cambridge University Press:  26 February 2011

D. K. Rehbein ,
D. K. Hsu ,
R. B. Thompson  and
T. A. Jones
D. K. Rehbein
Affiliation:
Ames Laboratory, Iowa State University, Ames, IA 50011
D. K. Hsu
Affiliation:
Ames Laboratory, Iowa State University, Ames, IA 50011
R. B. Thompson
Affiliation:
Ames Laboratory, Iowa State University, Ames, IA 50011
T. A. Jones
Affiliation:
Savannah River Plant, E.I. DuPont de Nemours, Aiken, SC 29808
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Extract

Resistance tube closure welds, referred to as pinch welds, are used to reliably seal small stainless steel tubing [1]. The quality of the bond is dependent upon, among other factors, the cleanliness of the tube bore. Post weld inspections are therefore desired as process control procedures. In previous studies, ultrasonics was shown to have considerable promise in this application. Thomas et al. [1] demonstrated that pattern recognition algorithms could be applied to the ultrasonic signals transmitted through the tubes to produce a correct classification of good and bad welds in several different sets of samples. The algorithms were somewhat dependent on the material from which the samples were fabricated, but all showed a good deal of commonality. In a parallel study, Rehbein et al. [2] examined, from a more mechanistic point of view, sets of tubes fabricated at the same time. They observed that gross disbonds could be easily detected from changes in signals either reflected from or transmitted through the bond line. When such disbonds were not present, they observed that signals doubly transmitted through the interface (i.e., the back surface echo) showed a trend to lower values as the bond quality decreased. This paper describes the sequel to that study, having the objective of developing a quantitative understanding of the interaction of the ultrasound with the pinch welds.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 82: Symposium I – Characterization of Defects in Materials , 1986 , 157
Copyright
Copyright © Materials Research Society 1987

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References

REFERENCES

1. Thomas, G. H., Spingarn, J. R., and Jones, T. A., Review of Progress in Quantitative NDE, 5, Thompson, D. O. and Chimenti, D. E., eds., (Plenum Press, NY, 1986), p. 1665.Google Scholar
2. Rehbein, D. K., Hsu, D. K., Thompson, R. B., and Jones, T. A., ibid, p. 1671.Google Scholar
3. Stanke, F. E. and Kino, G. S., J. Acoust. Soc. Am. 75, 665 1985.Google Scholar
4. Stanke, F. E., Schlumberger-Doll Research Laboratories, Ridgefield, Connecticut, private communication.Google Scholar