The Paton Welding Journal, 2001, №06

2001 №06 (01)

2001 №06 (03)

---

The Paton Welding Journal, 2001, #6, 6-12 pages

Argon-arc treatment of welded joints on 30KHGSA steel

V.M. Kulik, M.M. Savitsky, D.P. Novikova, V.G. Vasiliev, G.N. Gordan

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

Abstract
Effect of parameters of conditions and thermal cycle of a local argon-arc treatment without melting on changing the metal structure and mechanical properties of the high-strength steel welded joint was studied. It is shown that the arc heating within the wide ranges of treatment speed up to the temperatures of austenization of the welded joint metal, being hardened during welding, causes the repeated hardening, while at the temperatures below the austenization temperatures a short-time tempering is occurred. After the local argon-arc treatment the ductility and impact strength of the welded joint metal are increased, the mode of fracture is improved, the sensitivity to stress raisers is decreased.
Keywords: welded joint, arc treatment, high-strength steel, heating, cooling, hardening, tempering, structure, bainite, martensite, residual austenite, dilation curve, hardness, me¬chanical properties, fractogram

References

1. Kozlov, R.A. (1979) On weldability of heat-resistant steels. Svarochnoye Proizvodstvo, 2, 12 - 15.
2. Makarov, E.A. (1981) Cold cracks in welding of alloyed steels. Moscow: Mashinostroyeniye.
3. Bursky, G.V., Savitsky, M.M., Novikova, D.P. (1998) Re¬sistance of the HAZ of welded joints of hardening highstrength steels to delayed fracture in twin-arc welding. Avtomaticheskaya Svarka, 2, 12 - 15.
4. Vinokurov, V.A. (1968) Tempering of welded structures to lower stresses. Moscow: Mashinostroyeniye.
5. Pavlov, A.S., Zakharov, V.I., Skorobogatov, I.V. et al. Process of electron beam welding. USSR author’s certificate 1792035, Int. Cl. В 23 К 15/00. Publ. 1996.
6. Asnis, A.E., Ivashchenko, G.A., Frenkel, I.Kh. et al. (1980) Argon-arc treatment a potential for lowering the metal content of welded structures. Avtomaticheskaya Svarka, 6, 69 - 70.
7. Bondarenko, L.I., Puzrin, L.G. (2000) Argon-arc surface quenching - method for hardening artillery barrels. The Paton Welding J., 2, 33 - 34.
8. Kulik, V.M., Savitsky, M.M., Novikova, D.P. et al. (1999) Investigation of arc treatment of high-strength steel welded joints. Avtomaticheskaya Svarka, 5, 19 - 24.
9. Kulik, V.M., Bursky, G.V., Savitsky, M.M. (2000) Features of arc treatment of hardening steels without melting. Ibid., 5, 31 – 35.
10. Grabin, V.F., Denisenko, A.V. (1978) Metallurgy of welding lowand medium-alloyed steels. Kyiv: Naukova Dumka.
11. Popov, A.A., Popova, L.E. (1965) Isothermal and thermokinetic diagrams of decomposition of overcooled austenite. Refer. Book. Moscow: Metallurgia.
12. Shorshorov, M.Kh., Belov, V.V. (1972) Phase transformations and changes of the properties of steel in welding. Atlas. Moscow: Nauka.
13. (1983) Metals science and heat treatment of steel. Refer. Book. Ed. by M.L. Bernshtein, A.G. Rakhshtadt. Moscow: Metallurgia.
14. Popov, A.A. (1963) Phase transformations in metal alloys. Moscow: Metallurgizdat.

---

Suggested Citation

V.M. Kulik, M.M. Savitsky, D.P. Novikova, V.G. Vasiliev, G.N. Gordan (2001) Argon-arc treatment of welded joints on 30KHGSA steel. The Paton Welding J., 06, 6-12.

---