The Paton Welding Journal, 2021, №11



2021 №11 (05)

DOI of Article 10.37434/tpwj2021.11.06

2021 №11 (07)

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The Paton Welding Journal, 2021, #11, 34-37 pages

Requirements to technical characteristics of resistance microwelding machines

Yu.M. lankin

E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

Abstract
Welding of up to 0.5 mm thick parts is usually called microwelding. Resistance microwelding is widely applied in electronics and instrument-making. Thermal inertia of welded parts at resistance welding is proportional to the square of their thickness. As a result of low thermal inertia of the parts at microwelding, the change of their temperature is close to the change in time of welding current of 50 Hz industrial frequency. In order to eliminate the temperature ripple, resistance microwelding should be conducted by direct current pulses or high-frequency welding current. At microwelding, the initial part-part contact resistance is tens of times higher than that of the parts being welded. To reduce the initial splashes of molten metal and to stabilize the welded joint quality, the welding current should increase smoothly at microwelding.
Keywords: resistance microwelding, similarity theory, thermal inertia, welding current frequency, typical welding modes

Received 01.09.2021
Accepted: 29.11.2021

References

1. Bannov, M.D. (2005) Resistance welding technology and equipment. Moscow, Akademiya [in Russian].
2. Ataush, V.E., Leonov, V.P., Moskvin, E.G. (1996) Microwelding in instrument engineering. Riga, RTU [in Russian].
3. Moravsky, V.E., Vorona, D.S. (1985) Technology and equipment for spot and projection capacitor-discharge welding. Kiev, Naukova Dumka [in Russian].
4. Kolupaev, Yu.F., Privezentsev, V.I. (2003) Peculiarities of capacitor-discharge welding of nichrome in producing of jevellery. Svarochn. Proizvodstvo, 11, 41–43 [in Russian].
5. Paerand, Yu.E., Bondarenko, A.F. (2005) Peculiarities of formation of current pulses for small-size parts. Tekhnichna Elektrodynamika. Tem. Issue: Power Electronics and Power Efficiency, Pt 3, 28–31 [in Russian].
6. Paerand, Yu.E., Bondarenko, A.F. (2006) Application of special shape pulses for resistance microwelding. In: Proc. of 7th Int. Sci.-Pract. Conf. on Modern Information and Electronic Technologies (MIET–2006), Odessa, Vol .2, SE Neptun, Tekhnologiya.
7. Paerand, Yu.E., Bondarenko, A.F. (2006) Power supply for resistance microwelding with programmable shape of welding pulse. Tekhnologiya i Konstruirovanie v Elektronnoj Apparature, 4, 51–54 [in Russian].
8. Lankin, Yu.N. (1967) Electromodeling of thermal processes in resistance spot welding. Avtomatich. Svarka, 7, 23–26 [in Russian].
9. Lebedev, V.K., Yavorskij, Yu.D. (1960) Application of similarity criteria for determination of resistance welding modes. Ibid., 8, 37–44 [in Russian].
10. Paton, B.E., Lebedev, V.K. (1969) Electric equipment for resistance welding. Theory elements. Moscow, Mashinostroenie [in Russian].
11. Paton, B.E., Gavrish, V.S., Grodetsky, Yu.S. (1963) Inertialess diagrams of automatic regulation of resistance welding processes. Avtomatich. Svarka, 5, 7–10 [in Russian].
12. Leonov, V.P., Barabanshchikova, L.A., Grechenkova, A.A., Ataush, V.E. (1990) Controllable power supply SARM-1 for resistance microwelding. Svarochn. Proizvodstvo, 10, 36–38 [in Russian].

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