The Paton Welding Journal, 2000, №09

2000 №09 (12)

2000 №09 (14)

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The Paton Welding Journal, 2000, #9, 79-87 pages

Development of calculation procedures for assessment of allowable defects in welded joints of critical structures

V.I. Makhnenko, O.V. Makhnenko

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

Abstract
Algorithms of assessment of allowable defects in welded joints of the critical structures are considered on the basis of a well-known concept "fitness-for-purpose", developed by the International Institute of Welding and advanced approaches of fracture mechanics of bodies with cracks. A significant role of residual welding stresses, geometric peculiarities of welded joints, mechanical heterogeneity, caused by the effect of a welding thermal cycle and appropriate impurities in weld metal, is outlined.
Keywords: equivalent cracks, intercrystalline stress corrosion, radiation, fluence of fast neutrons, embrittlement, critical temperature of brittleness

References

1. Harrison, R.P., Loosemore, K., Milne, I. et al. (1980) Assessment of the integrity of structures containing defects. In: Report R/H/R6-Rev. 2 of CEGB. Berkley.
2. Harrison, J.D. (1984) Fracture mechanics developments related to the weld defect acceptance methods given in British Standard PD 6493. In: Proc, of 2nd Math. Conf on Fract. and Fract. Meeh., Johannesburgh, Nov, 26-27. Johannesburgh.
3. (1991) Methodology of determination of admissible defect sizes in metal of equipment and pipelines during the Operation of NPS. Moscow: NIKIET.
4. Zvezdin, Yu.I., Rivkin, Ye.Yu., Vasilchenko, G.S. et al. (1990) Application of results of XUT in strength calculations. Tyazholoye Mashinostroyeniye, 3, 12 - 14.
5. (1990) MR 125-01-90. Calculation of stress intensity factors and section-weakening coefficients for defects in welded joints. Kyiv.
6. (1990) IIW/1IS-SST-1157-90. IIW Guidance on assessment of the fitness for purpose of welded structures.
7. Rumyantsev, V.V. (1993) Pipings at XPS: increasing their reliability and service lite duration. Atomnaya Tekhnika za Rubezhom, 3, 3 - 3.
8. Horn, R.M., Kass, J.N., Ranganath, K. (1984) Evaluation of the growth and stability of stress corrosion cracking in sensitized austenitic pipings. J. of Pressure Vessel Technology. 2. 201 - 208.
9. (1989) Norms of strength calculation for equipment and pipings of nuclear power units PNAE-G-7-002-86. Moscow: Energoatomizdat.
10. Makhnenko. V.I., Kasatkin, O.G., Velikoivanenko, E.A. et al. (1998) Computational and experimental study of residual welding stresses within the zone of circumferential welded joints in Dn 300 KMPTs ChNPS-3 piping. In: Proc, of the 5th Int. Conf, on Material-Induced Problems at Design, Manijfactiirc and Operation of Equipment of MPS. St.-Petersburgh.
11. Andreykiv, A.E. (1982) Spatial problems of a crack the ory. Kyiv: Kaukova Dumka.
12. Pokrovsky. V.V., Kaplunenko, V.G., Kovrizhkin, Yu.I. ei al. (1998) Assessment of the resistance of reactor steeb to brittle fracture alter different conditions ot themal mechanical preloading and sustainability, of positive effect of thermal pressing. In: Proc, of the. 5th int. Conf, on Material-Induced Problems at Design. Manufacture and Operation of Equipment of MPS. St.- Petersburgh.
12. Zubchenko, A.S. (1997) Reliability and service life of welded structures of nuclear power equipment. Avtomaticheskaya Soarlca, 6, 3 – 10.

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Suggested Citation

V.I. Makhnenko, O.V. Makhnenko (2000) Development of calculation procedures for assessment of allowable defects in welded joints of critical structures. The Paton Welding J., 09, 79-87.

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