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.