TRANSACTIONS OF THE KRYLOV STATE RESEARCH CENTRE

Science journal

 
ISSN (print) 2542-2324 /(online) 2618-8244


Articles of The Transactions of KSRC








Progress in low-frequency vibration processing technology for metal welds in shipbuilding and machine engineering



Full text article ( in russian)

Year

 
2021

Issue

 
20212

Volume

 
2

Pages

 
121-125

Caption

 
Progress in low-frequency vibration processing technology for metal welds in shipbuilding and machine engineering

Authors

 
Stepanov V

Keywords

 
low-frequency vibration processing, finite-element method, natural vibration frequencies, residual stresses, stress re-distribution

DOI

 
10.24937/2542-2324-2021-2-S-I-121-125

Summary

 
Residual welding strains and stresses affect strength, lifetime and reliability of shipbuilding hull structures and a wide spectrum of welded metal structures applied in manufacturing of machine tools, machines and railroad cars, as well as in building industry. Welding strains also increase man-hours required for manufacturing. A traditional way of residual stress mitigation in shipbuilding and other industries is thermal processing which is known to be a costly and labour-intensive operation. An alternative process is low-frequency vibration processing that is relatively easy and highly cost-efficient. Low-frequency vibration processing basically means that metal structures are subjected to alternating-sign loads at resonant or near-resonant frequencies by means of an electromechanical vibration exciter. Size stabilization in this kind of processing is achieved through mitigation and re-distribution of the first-kind residual stresses, i.e. those equilibrating over the entire product or its large elements, so that material structure comes to a more stable equilibrium. This paper discusses SSTC experience in the induction of low-frequency vibration processing of welded metal structures to the practice of shipyards and machine manufacturing enterprises, as well as describes state-of-the-art equipment for its performance and the equipment used to assess and check its results.

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