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The material in this paper consists of developments in the general art of radiography of welds which have come into use since 1936 when an earlier Symposium on Radiography and X-ray Diffraction Methods was held by this Society. The excellent papers given at that time represented the best practices in use. Since that time, a number of developments have been made which are covered in the present paper.
The maximum available voltage has been raised from 400,000 v. to 1,000,000 v. This development has allowed many further improvements in technique. Not only has it raised by many inches the maximum weld thickness which can be radiographed, but it also has allowed the wider use of lead intensifying screens to improve detail in the exograph. It also gives superior techniques for many special applications.
New fine-grained, high-contrast films have come into use which improve greatly the detail of exographs and gammagraphs. Techniques such as double-film viewing, which present many advantages, have come into use, and the trend toward longer film lengths for special cases is discussed.
There have been some changes in code requirements which have come about as a result of wider experience, and these changes are discussed.
Lorentz, R. E.
Metallurgist, Combustion Engineering Co., Inc., Chattanooga, Tenn.