Abstract
When obtaining fixed joints of different thickness from dissimilar materials, there arise difficulties associated with various thermophysical properties, and the likelihood of occurrence of intermetallic phases under chemical interaction. The use of super hard modes of thermodynamic effect during high-voltage condenser welding (HCW) provides localizing heat generation in the contact zone of the weld surfaces, activating the surface layers through converging the surfaces with the displacement of molten metal to the periphery of the contact zone and forming bonding in the solid phase.Recommendations are given for the use of technological methods of high-voltage capacitor welding depending on the combinations of welded alloys. A description of the nature and physical processes occurring at each technological reception is given.It is shown that the energy stored in the capacitor banks is spent on heat and power action. Variation of the mass of the induction - dynamic drive pusher and its inductance enables to adjust the ratio of thermal and mechanical components of the HCW process.The energy dispersion analysis of the experimental compounds obtained from dissimilar alloys confirms the absence of diffusion in high-voltage capacitor welding under super-rigid exposure modes.
Highlights
A share of structures made of dissimilar metals and components of different thicknesses used in mechanical engineering, instrument making, and space technology, is increasing annually
The application of pulsed low-inductance capacitors provides the high-voltage condenser welding with an induction-dynamic drive (HCW with IDD) under super-hard exposure modes with a current duration of (20-400) 10-6 s, amplitude up to 300∙103 A, pulse pressure up to 5∙106 N/m2 for obtaining joints in homogeneous and heterogeneous combinations [9]
Where C - is the capacitance of the capacitive energy storage, F; U - the voltage on the capacitor, V; L - inductive reactance of the discharge circuit, determined by the number of turns of the inductor, H; Id – discharge current, A; R - is the resistance of the bit setting circuit, Om; tс-solid-phase connection time HCW; tb.a. - the burning time of the arc Earlier studies [11] revealed the factors of the HCW process that influence the strength parameters of experimental samples
Summary
A share of structures made of dissimilar metals and components of different thicknesses used in mechanical engineering, instrument making, and space technology, is increasing annually. One of the techniques to reduce the duration of heating metals is the use of pulsed energy sources, namely, the discharge of a capacitor bank to weld components.
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