The Paton Welding Journal, 2006, №02

2006 №02 (03)

2006 №02 (05)

---

The Paton Welding Journal, 2006, #2, 16-19 pages

Structure changes in HAZ metal of steel X60 welded joints in underwater welding

S.Yu. Maksimov¹, V.S. But¹, V.G. Vasiliev¹, S.M. Zakharov², N.V. Zajtseva²

¹E.O. Paton Electric Welding Institute of the NASU. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine.
²G.V. Kurdyumov Institute for Physics of Metals, NASU, Kiev, Ukraine

Abstract
Phase composition of the HAZ microstructure in welded joints of steel X60, made under the water, was evaluated proceeding from analysis of the diagram of anisothermal transformation of austenite and results of metallographic examination. It is established that at cooling rates characteristic of the conditions of underwater welding, in HAZ martensite structure inevitably develops, which determines brittle nature of a welded joint failure under the impact of external load.
Keywords: underwater welding, low alloy steels, HAZ metal, cooling rate, structure transformations, cold cracks

References

1. Wegst, C.W. (1995) Stahlschluessel. Verlag Stahlschluessel Wegst GMbH.
2. Lukianov, V.F., Naprasnikov, V.V. (1983) Influence of fracture initiation type on crack propagation in welded joints. Svarochn. Proizvodstvo, 5, 3–5.
3. Makarov, E.L. (1981) Cold cracks in welding of alloy steels. Moscow: Mashinostroenie.
4. Seferian, D. (1963) Metallurgy of welding. Moscow: Mashgiz.
5. Chigarev, V.V., Ustinov, A.V. (2000) Design-experimental estimation of the possibility of reduction of the HAZ metal cooling rate in wet underwater welding. The Paton Welding J., 5, 24–29.
6. Morozov, A.N. (1980) Hydrogen and nitrogen in steel. Moscow: Metallurgiya.
7. Makhnenko, V.I., Maksimov, S.Yu., Korolyova, T.V. (2004) Investigation of peculiarities of transport of hydrogen in underwater fusion welding of structural steels. The Paton Welding J., 1, 11–21.
8. Banmann, H., Behrens, U., Bethe, K. (1980) Analysis of hydrogen in solids. In: Proc. of 7th Div. Conf. on Nucl. Phys. Meth. Mater. Res. (Darmstadt, Sept. 23–26, 1980). Weisbaden.
9. Gavriljuk, V.G., Shivanjuk, V.N., Foct, J. (2003) Diagnostic experimental results on the hydrogen embrittlement of the austenitic steel. Acta Material., 51, 1293–1305.

---

Suggested Citation

S.Yu. Maksimov, V.S. But, V.G. Vasiliev, S.M. Zakharov, N.V. Zajtseva (2006) Structure changes in HAZ metal of steel X60 welded joints in underwater welding. The Paton Welding J., 02, 16-19.

---