PSI - Issue 30

E.G. Grigoryev et al. / Procedia Structural Integrity 30 (2020) 33–39 Grigoryev E.G. et al. / Structural Integrity Procedia 00 (2020) 000–000

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Fig. 1. Schemes of HVCW with IDD: (a) without initial clearance; (b) with an initial clearance; (c) with the protrusion of the core element; (d) compaction of powder compositions. 2. Theoretical discussions A theoretical analysis of technological methods revealed a qualitative picture of changes in the physical parameters of the process, Fig. 2, obtained by Nescoromniy (2019). The duration of the charge of capacitor banks t cd depends on the total capacity of the storage unit and the power of the charger. An increased voltage of several thousand volts is one of the main indicators of the input energy spent on thermomechanical action, as well as the need to create an electric field strength between the surfaces to be welded of the order of (2-4) • 10 8 V / m when an arc discharge is excited.

Fig. 2. Kinetics of the parameters of the HVCW process U IVD - initial voltage on the drive; U - is the voltage; I d - discharge current; T c is the current discharge period; P m is the magnetic pressure; P pm –– vapor pressure of metal; Р tp - total pressure; Δ R-G - the resulting gap; Δ I-C is the initial clearance; S 1 and S 2 - movement of the part with the formed and initial gaps; t cd –– time of charging the drive; t a.b – time of arc burning.