Automatic Welding, 2016, №12



2016 №12 (01)

DOI of Article 10.15407/as2016.12.02

2016 №12 (03)

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Avtomaticheskaya Svarka (Automatic Welding), #12, 2016, pp. 11-14
 

Finite-element modelling of stress-strain state in weldability tests (PVR-TEST)

K.A. Yushchenko, E.A. Velikoivanenko, N.O. Chervyakov, G.F. Rozynka And N.I. Pivtorak

E.O. Paton Electric Welding Institute, NASU 11 Kazimir Malevich Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua
 
Abstract
Hot cracks appearing in process of welding are an important problem determining weldability of number of structural materials. Regardless the fact that this phenomenon is widely investigated in course of many decades a nature of hot crack appearance is still a relevant problem for number of current alloys in fusion welding. To reach wider understanding of a mechanism of hot crack formation a finite-element method was used for mathematical modelling of PVR-Test. Realizing the mathematical model employing the experimental data, received as a result of such testing, allowed getting stress and strain distribution in the crack formation zones. The zones of plastic strain positive increments, promoting crack formation, were found for a range of brittleness temperature interval. Prediction of the zones of higher susceptibility to hot crack appearance as a result of decrease of material ductility well agrees with the experimental investigations. 8 Ref., 1 Table, 4 Figures.
 
Keywords: hot cracks, weldability testing, welding, PVR-Test, nickel alloys, finite-element method
 
 
Received:                19.10.16
Published:               24.01.17
 
 
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