Abstract
An electrode system for inducing a high density pulsed electric current (PEC) into the material for residual stresses (RS) relaxation has been proposed. A new non-destructive technology for determination of RS using electron speckle interferometry in combination with a local PEC treatment has been developed. Application of PEC at increased power parameters was investigated for control of stressed state of welded structures used in aircraft engineering. Results of practical application of the developed technologies and equipment are presented.
Highlights
Residual stresses are an important factor that has influence on the strength, quality and operational characteristics of welded structures
At present significant progress has been made in developing methods and means for determination and control of residual stresses [1,2,3]
After the current pulse is induced into a local area of the test object, residual stresses in that region are relieved causing displacements at nearby points
Summary
Residual stresses are an important factor that has influence on the strength, quality and operational characteristics of welded structures. The specialists at E.O.Paton Electric Welding Institute proposed residual stress determination by combined use of holographic interferometry and drilling a hole [4]. The progress of computer engineering allowed developing high-efficient methods for residual stresses determination using electron speckle-interferometry (ESPI) and blind hole drilling [8,9,10].
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