The Paton Welding Journal, 2006, №07

2006 №07 (02)

2006 №07 (04)

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The Paton Welding Journal, 2006, #7, 16-21 pages

Variations in structure and properties of HAZ metal in welded joints on steel 30KhGSA in arc treatment

V.M. Kulik, V.G. Vasiliev

E.O. Paton Electric Welding Institute of the NASU. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine.

Abstract
Austenitic transformation of the HAZ metal in arc welding proceeds at increased temperature. Repeated austenising in arc treatment of hardened metal in a region of overheated HAZ occurs at an increased temperature, and its rapid heating leads to decrease in size of austenite grain. The hardening structure is restored, and properties similar to the initial ones are acquired in subsequent cooling. Heating of the hardened HAZ metal below Ac results in short-term tempering, improvement of its impact toughness and cold crack resistance. The highest efficiency of the arc effect is achieved in heating of the HAZ metal within the intercritical temperature range.
Keywords: arc welding, arc treatment, high-strength steel, heat-affected zone, heating, cooling, thermal cycle, hardening, dilatogram, phase transformations, structure, impact toughness, delayed fracture

References

1. (1974) Technology of fusion electric welding of metals and alloys. Ed. by B.E. Paton. Moscow: Mashinostroenie.
2. Paton, B.E., Savitsky, M.M., Kuzmenko, G.B. (1994) Prospects of application of high-strength medium-alloy steels in welded high-pressure cylinders for motor transport. Avtomatich. Svarka, 3, 4–9.
3. Kulik, V.M., Savitsky, M.M., Novikova, D.P. et al. (2004) Features of argon-arc treatment with insipient melting of welded joint on quenching steel. The Paton Welding J., 3, 15–20.
4. Kulik, V.M., Savitsky, M.M., Bursky, G.V. (2005) Evalu¬ation of delayed fracture resistance of HAZ metal of high- strength steel with modelling of stress relaxation. Ibid., 4, 17–22.
5. (1983) Metals science and heat treatment of steel. Refer. Book. Vol. 3: Principles of heat treatment. Ed. by M.L. Bernshtein, A.G. Rakhshtadt. Moscow: Metallurgiya.
6. Savitsky, A.M., Vasiliev, V.G., Savitsky, M.M. et al. (2005) Influence of the heating stage on structure formation of welded joints on hardening steels. The Paton Welding J., 1, 15–17.
7. Lobanov, L.M., Mikhoduj, L.I., Vasiliev, V.G. et al. (1999) Features of thermodeformational processes during arc welding of high-strength steels. Ibid., 3, 3–11.
8. Sazonov, B.G. (1990) Extreme diffusion activity in steel at the state of pre-transformation. Metallovedenie i Term. Obrab. Metallov, 7, 13–15.
9. Gridnev, V.N., Meshkov, Yu.Ya., Oshkaderov, S.P. et al. (1973) Physical principles of electric thermal hardening. Kiev: Naukova Dumka.
10. Kotrechko, S.A., Meshkov, Yu.Ya., Telovich, R.V. (2004) Parameters of microstructure which control the brittle strength of low-alloy steels with tempered martensite structure. Metallofizika i Nov. Tekhnologii, 26(4), 435–456.

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Suggested Citation

V.M. Kulik, V.G. Vasiliev (2006) Variations in structure and properties of HAZ metal in welded joints on steel 30KhGSA in arc treatment. The Paton Welding J., 07, 16-21.

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