TPWJ, 2014, #6-7, 110-114 pages
SELECTION OF SHIELDING GAS FOR MECHANIZED ARC WELDING OF DISSIMILAR STEELS
Journal The Paton Welding Journal
Publisher International Association «Welding»
ISSN 0957-798X (print)
Issue № 6-7, 2014 (June-July)
E.O. Paton Electric Welding Institute, NASU. 11 Bozhenko Str., 03680, Kiev, Ukraine. E-mail: email@example.com
Mechanized multilayer MIG/MAG welding by high-alloy wires is associated with the feasibility of formation of lacks of fusion and slag pieces in weld metal. Therefore, the improvement of technology, in particular the selection of shielding gas composition, is urgent. Feasibility of application of mixtures CO2
+ 3 % N2
+ 3 % N2
+ 0.5 % O2
as a shielding gas in mechanized arc welding of dissimilar steels is shown. It is shown that the metal oxidation occurs mainly in the inter-dendrite regions, intensity of which is increased with increase in amount of nickel in the welding wire. Weld metal alloying with nitrogen does not change the intensity of metal oxidation process and almost has no influence on slag crust removal from the deposited metal surface. 17 Ref., 2 Tables, 3 Figures.
mechanized arc welding, shielding gas, CO2, nitrogen, gas mixtures, high-alloy weld metal, slag crust, spinels, alloying with nitrogen
1. Gotalsky, Yu.N. (1992) Welding of pearlitic steels by austenitic materials. Ed. by K.A. Yushchenko. Kiev: Naukova Dumka.
2. Dyatlov, V.I., Korinets, I.F. (1968) Automatic nitrogen-shielded welding of austenitic chrome-nickel steels and alloys. Avtomatich. Svarka, 9, 25.
3. Kakhovsky, N.I. (1975) Welding of high-alloy steels. Kiev: Tekhnika.
4. Nechaev, V.A., Timofeev, M.M., Rubennik, Yu.I. (1974) Influence of welding parameters on absorption of nitrogen by metal in non-shielded arc welding with high-alloy austenitic wire. Svarochn. Proizvodstvo, 4, 24-26.
5. Lopukhov, Yu.I., Ivnitsky, B.P., Sorokin, G.A. (1989) Gas-arc surfacing of fittings in nitrogenous shielding atmosphere. Energomashinostroenie, 9, 33-35.
6. Kotvitsky, A.D. (1974) Shielded-gas welding. Moscow: Vysshaya Shkola.
7. Lettle, K., Stapon, G. (2005) How to simplify the choice of shielding gas. Practical Welding Today, 9(1), 22-25.
8. Herold, H. et al. (2005) The use of nitrogen gas at welding of heat-resistant nickel alloys. Austral. Welding J., Vol. 50 (2nd quart.), 40-47.
9. Gotalsky, Yu.N., Snisar, V.V. (1970) Wires for welding of dissimilar steels. Svarochn. Proizvodstvo, 2, 42-44.
10. Potapov, N.N. (1985) Oxidation of metals in fusion welding. Moscow: Mashinostroenie.
11. Gotalsky, Yu.N., Stretovich, A.D. (1976) About mechanism of slag crust adhesion with weld metal. Svarochn. Proizvodstvo, 11, 54-56.
12. Musiyachenko, V.F., Mikhoduj, L.I. (1987) Arc welding of high-strength low-alloy steels. Moscow: Mashinostroenie.
13. Elagin, V.P., Snisar, V.V., Lipodaev, V.N. (1995) Mechanized welding of steel 15Kh5M without heating and heat treatment. Avtomatich. Svarka, 8, 19-24.
14. Snisar, V.V., Lipodaev, V.N., Elagin, V.P. et al. (1991) Effect of nitrogen alloying of austenitic weld on development of structural heterogeneity in fusion zone with pearlitic steel. Ibid., 2, 10-14.
15. Pidgaetsky, V.V. (1970) Pores, inclusions and cracks in welds. Kyiv: Tekhnika.
16. Grishchenko, L.V., Kiselyov, Ya.N., Petrykin, V.M. (1987) Decrease of susceptibility to pore formation in weld metal during welding with austenitic electrodes on chrome-nickel base. Voprosy Sudostroeniya, Series Welding, Issue 26, 20-24.
17. Elagin, V.P., Snisar, V.V., Lipodaev, V.N. (1993) Specifics of nitrogenous shielded gas arc welding with austenitic wires of dissimilar and pearlitic steels. Avtomatich. Svarka, 7, 12-16.