CONCERNING THE MELTING OF AN ALUMINIUM ELECTRODE BY THE ARGON ARC OF STRAIGT POLARITY

  • Vladimir Sidorov Togliatti State University
  • Dmitry Sovetkin Togliatti State University
  • Nikolay Borisov Togliatti State University
Keywords: welding arc, consumable electrode, aluminum, direct polarity, remelting stability, shielding gas welding

Abstract

This paper gives the information analysis on the ratio of the melting rate of electrode wire on welding arcs of direct and reverse polarity in СО2. At equal currents, the melting rate on direct polarity arc is about two times higher than the melting rate on reverse polarity arc. When welding in shielding gases, the reason to refuse the use of direct polarity arc is the low melting rate stability of the electrode wire. It is caused by the intense moving of arc cathode spot affected by the emissivity change of the electrode surface. Within the scope of this paper, the authors propose a calculation method for arc power transmitted to a consumable aluminum electrode on various polarities. The calculated specific power (per 1 А of the current) is significantly higher for electrode-cathode, and when step-up the current, the power increases more intensively than for anode. The experiment determined the melting rate of aluminum electrode wire of 1.2 mm diameter for direct polarity arc in argon. It is as well about two times higher than for reverse polarity. Within the limits of 80–180 А currents on the arc direct polarity, there was not defined any significant dependence between the melting ratio of aluminum wire and arc current. The calculation method ensures good convergence of designed and experimental data on the ratio of electrode melting rates on different polarities. The formulas obtained allowed evaluating the effective arc power in argon for aluminum products. Further researches are to be aimed at defining the stability conditions of the melting rate of electrode wire on direct polarity arc in shielding gases. It is especially necessary for welding of heavy thickness parts to reach more efficient filling of edge preparation.

Author Biographies

Vladimir Sidorov, Togliatti State University

Doctor of Sciences (Engineering), Professor, professor of Chair “Welding, Material Pressure Processing and Allied Processes”

Dmitry Sovetkin , Togliatti State University

lecturer of Chair “Welding, Material Pressure Processing and Allied Processes”

Nikolay Borisov , Togliatti State University

student

References

1. Lozovoy V.G., Dzyuba O.V., Dzyuba V.M., Shtokolov S.A., Kurlanov S.A. To the question of welding on direct polarity. Svarka i diagnostika, 2014, no. 6, pp. 55–59.
2. Kobernik N.V., Chernyshov G.G., Gvozdev P.P., Linnik A.A. Influence of the type and polarity of the current on the penetration of the electrode and base metal for arc welding under flux and al. Svarka i diagnostika, 2011, no. 5, pp. 24–27.
3. Lenivkin V.A., Dyurgerov N.V., Sagirov Kh.I. Tekhnologicheskie svoystva svarochnoy dugi v zashchitnykh gazakh [Technological properties of the arc in shielding gases]. Moscow, NAKS Publ., 2011. 367 p.
4. Sidorov V.P., Abramova S.V. Dependence of the melting time of coated electrodes from arc current. Svarochnoe proizvodstvo, 2018, no. 10, pp. 14–18.
5. Kiselev A.S., Gordynets A.S. The effect of the parameters of the regime on the spatial stability of the arc during argon tungsten-arc welding of aluminum alloys. Vestnik nauki Sibiri, 2013, no. 4, pp. 61–66.
6. Lenivkin V.A., Dyurgerov N.G., Morozkin I.S., Parshin S.G. Spatial stability of the welding arc. Svarka i diagnostika, 2016, no. 1, pp. 16–21.
7. Berezovsky B.M. Matematicheskie modeli dugovoy svarki [Mathematical models of arc welding]. Chelyabinsk, YurGU Publ., 2003. Vol. 3, 485 p.
8. Savinov A.V., Polesskiy O.A., Lapin I.E., Lysak V.I., Krasikov P.P., Chudin A.A. Electrophysical characteristics of arc and formation of welded joints for welding with a non-consumable electrode. Journal of Materials Processing Technology, 2017, vol. 239, pp. 195–201. DOI: 10.1016/j.jmatprotec.2016.08.021.
9. Savinov A.V., Lapin I.E., Polesskiy O.A., Lysak V.I., Krasikov P.P. Thermal and force effects of the arc on the weld pool in non-consumable electrode (TIG) welding in inert gas mixtures. Welding International, 2016, vol. 30, no. 12, pp. 941–944. DOI: 10.1080/09507116.2016.1157332.
10. Sidorov V.P. A technique for evaluating near-electrode voltage drops on an arc burning in argon between tungsten and aluminum. Avtomaticheskaya svarka, 1991, no. 6, pp. 36–37.
11. Pokhodnya I.K., Suttel A.M. The enthalpy of the droplets of the electrode metal when welding in carbon dioxide. Avtomaticheskaya svarka, 1970, no. 10, pp. 5–8.
12. Sidorov V.P. Raschety parametrov svarki plavleniem [Calculations of fusion welding parameters]. Togliatti, TGU Publ., 2017. 286 p.
13. Karkhin V.A. Teplovye protsessy pri svarke [Thermal processes during welding]. Saint Peterburg, Politekhn. un-t Publ., 2015. 572 p.
14. Bykhovsky D.G., Belyaev V.M. Energy characteristics of a plasma arc during welding at reverse polarity. Avtomaticheskaya svarka, 1971, no. 5, pp. 27–30.
15. Shchitsyn Yu.D., Kosolapov O.A., Strukov N.N. Energy distribution in a compressed arc when the plasma torch operates on a current of reverse polarity. Svarka i diagnostika, 2010, no. 3, pp. 13 –16.
16. Zakharov Yu.V. Matematicheskoe modelirovanie tekhnologicheskikh sistem [Mathematical modeling of technological systems]. Yoshkar-Ola, PGTU Publ., 2015. 84 p.
17. Grinyuk A.A., Korzhik V.N., Shevchenko V.E., Babich A.A., Peleshenko S.I., Chayka V.G., Tishchenko A.F., Kovbasenko G.V. Development trends of plasma-arc welding of aluminum alloys. Avtomaticheskaya svarka, 2015, no. 11, pp. 39–50.
18. Savinov A.V., Polessky O.A., Lapin I.E., Lysak V.I., Chudin A.A., Krasikov P.P. Penetrating power of alternating current arc with a rectangular pulse shape. Izvestiya Volgogradskogo gosudarstvennogo tekhnicheskogo universiteta, 2016, no. 2, pp. 135–141.
19. Sidorov V.P., Sovetkin D.E. Melting points on aluminum by a compressed arc with bipolar current pulses. Materialy Vseros. nauchno-prakt. konf. “Khimiya. Ekologiya. Urbanistika”. Perm, PNIPU Publ., 2019. Vol. 2, pp. 545–549.
20. Milyutin V.S., Shalimov M.P., Shanchurov S.M. Istochniki pitaniya dlya svarki [Power sources for welding]. Moscow, Ayris-press Publ., 2007. 384 p.
Published
2019-12-30
Section
Technical Sciences