2019 №05 (01) DOI of Article
2019 №05 (03)

Automatic Welding 2019 #05
Avtomaticheskaya Svarka (Automatic Welding), # 5, 2019, pp.18-24

Strain state of welded and brazed units from dissimilar materials with soft interlayer at thermal loading

V.V. Kvasnitsky1, V.F. Kvasnitsky2, M.V. Matvienko2, E.A. Buturlya2, G.V. Ermolaev2
1National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute». 37 Pobedy Ave., Kiev-56, Ukraine. Е-mail: kvas69@ukr.net
2National University of Shipbuilding. 9 Heroev Stalingrada Ave., 54025, Nikolaev, Ukraine. E-mail: welding@nuos.edu.ua

Computer modeling using the finite element method was used to study the stress-strain state in joints of homogeneous materials under axial load. The studies were carried out taking into account plastic deformations in soft interlayers, which are usually used in diffusion welding to activate surfaces and reduce residual stresses, and in brazing, as the intermediate interlayer, a brazed weld serves, that differs from the base metal in its physical and mechanical properties. It is shown that along the butt, both in the metals being joined as well as in the interlayer, equivalent stresses are distributed more uniformly than during elastic deformation. Plastic deformations in the interlayer are absent in the zone of stagnation (on the axis of the cylindrical unit) and are almost linearly increased, reaching maximum values (about 6.5%) at the outer cylindrical surface of the unit. A high level of plastic deformations indicates the feasibility of using thermal loading in diffusion welding of dissimilar materials with soft interlayers. The degree of “softness” of the interlayer and its effect on stress-strain state of the unit during plastic deformation is mainly determined by its strength (yield strength) and almost does not depend on its rigidity (elastic modulus). 8 Ref., 10 Fig.
Keywords: welded and brazed units, soft interlayer, computer modeling, stress-strain state, thermal loading

Received: 12.02.2019
Published: 04.04.2019


1. Bakshi, O.A., Kachanov, L.M. (1965) On stressed state of plastic interlayer under axisymmetric deformation. Izv. AN SSSR, Mekhanika, 2, 134-137 [in Russian].
2. Bakshi, O.A., Shron, R.Z. (1971) On calculated evaluation of strength of welded joints with soft interlayer. Svarochn. Proizvodstvo, 3, 3-5 [in Russian].
3. Chigarev, A.V., Kravchuk, A.S., Smalyuk, A.F. (2004) ANSYS for engineers: Refer. Book. Moscow, Mashinostroenie-1 [in Russian].
4. Basov, K.A. (2005) ANSYS: User directory. Moscow, DMK Press [in Russian].
5. Kvasnytskyi, V.V., Kvasnytskyi, V.F., Dong Chunlin et al. (2018) Stressed state of welded and brazed assemblies from similar materials with a soft interlayer under axial loading. The Paton Welding J., 4, 6-10. https://doi.org/10.15407/tpwj2018.04.01
6. Kvasnytskyi, V.V., Yermolayev, H.V., Matviienko. M.V. (2017) Mechanics of bonds in diffusion welding, soldering and spraying of dissimilar materials under elasticity conditions. In: Monography. Nikolaev, NUK [in Russian].
7. Makhnenko, V.I., Kvasnitsky, V.V. (2009) Peculiarities of formation of stress-strain state in diffusion bonds between dissimilar materials. The Paton Welding J., 8, 7-11.
8. Ermolaev, G.V., Martynenko, V.A., Olekseenko, S.V. et al. (2017) Effect of the rigid interlayer thickness on the stress-strain of metal-graphite assemblies under thermal loading. Strength of Materials, 49(3), 422-428. https://doi.org/10.1007/s11223-017-9882-4