Avtomaticheskaya Svarka (Automatic Welding), #6, 2016, pp. 154-161
Dependencies of discrete-additive formation of microvolumes of metal being solidified in multi-layer microplasma powder surfacing of nickel alloys
K.A. Yushchenko, A.V. Yarovitsyn And N.O. Chervyakov
E.O. Paton Electric Welding Institute, NASU
11 Kazimir Malevich Str., 03680, Kiev, Ukraine. E-mail: email@example.com
Peculiarities of heat input, bead cross-section area and efficiency were investigated at single-layer microplasma powder surfacing of nickel heat-resistant alloy JS32 on narrow substrate of 1–2 mm thickness. It is determined that series of its modes using 5–15 A welding current differs by the minimum heat input. Calculated evaluation of stress-strain state of a welded joint was carried out for its minimum and maximum level during building-up of edge of a plate using single- and three-layer surfacing. It is shown that the value of heat input in microplasma surfacing determines a width of plastic deformation zone and value of sum plastic deformations as a result of reheating in multi-layer surfacing. New technological principles were proposed for selecting the modes of multi-layer and 3D-microplasma powder surfacing of the parts from nickel heat-resistant alloys, providing the minimum heat input in a part and regulating requirements to welding current value, time of existence of metal of weld micropool in molten state and its volume. 20 Ref., 2 Tables, 10 Figures.
microplasma powder surfacing, narrow substrate, nickel heat-resistant alloy JS32, effective power of part heating, heat input, bead cross-section area, volume of weld micropool, surfacing efficiency, stress-strain state of welded joint
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