The Paton Welding Journal, 2005, №04

2005 №04 (03)

2005 №04 (05)

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The Paton Welding Journal, 2005, #4, 17-22 pages

Evaluation of delayed fracture resistance of HAZ metal of high-strength steel with modeling of stress relaxation

V.M. Kulik, M.M. Savitsky, G.V. Bursky

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

Abstract
The rationality of inducing delayed fracture with lowering of the load on a high-strength steel weldedjoint was substantiated and its features were studied. The effectiveness of various delayed fracture indices for evaluation of cold cracking resistance in the HAZ is considered. It is shown that for increasing the crack resistance of the joint of sheet steel 30KhGSA, it is rational to reduce the cooling rate during TIG welding, in particular by increasing the heat input, applying a moderate mode, increasing the number of passes, performing arc treatment and tempering at the temperature of 150–200 °C.
Keywords: argon-arc welding, tungsten electrode, highstrength steel, welding mode, thermal cycle, cooling rate, metal microstructure, delayed fracture, stress relaxation, cold cracks

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Suggested Citation

V.M. Kulik, M.M. Savitsky, G.V. Bursky (2005) Evaluation of delayed fracture resistance of HAZ metal of high-strength steel with modeling of stress relaxation. The Paton Welding J., 04, 17-22.

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