ENERGETIC ANALYSIS OF HARD FACING AND WELD CLADDING OF AN AIR POWERED DROP HAMMER DAMAGED RAM

Abstract

This paper studies problems of hard facing of damaged and initially cracked mechanical engineering heavy parts of complex geometry such as large rams of air powered drop hammers. During long-term exploitation, these parts are subjected to thermal fatigue due to cyclic temperature changes and variable impact compression. Taking into consideration high ram costs and difficulties to purchase ram, the necessity of its reparation becomes obvious. The choices of the most suitable technologies of hard facing and welding of an initially cracked ram are also studied here. Besides the techno-economic analysis, an energetic analysis is performed as an additional criterion in assessment of the proposed technology.

Keywords

Dates

  • Submission Date2010-05-01
  • Revision Date2010-06-23
  • Acceptance Date2010-06-28

DOI Reference

10.2298/TSCI100501021L

References

  1. Jovanović, M., Lazić, V., Reparation of a damaged forging hammer mallet - Elaborate (in Serbian), Zastava kovačnica, 2002, Kragujevac.
  2. Lazić, V., et al., Reparation of damaged mallet for hammer forging by hard facing and weld cladding, Tehnical Gazette 16, ISSN 1330-3651, 4(2009), 107-113.
  3. Lazić, V., et al., Development and application of welding technologies for regeneration of damaged working parts of forging presses and hammers, Welding and Joining Technologies for a Sustainable Development and Environment, 2006., Timisoara, Romania, pp. 341-346.
  4. Lazić, V., et al., Theoretical-experimental determining of cooling time (t8/5) in hard facing of steels for forging dies, Thermal science, Vol. 14, No. 1, 2010, pp. 235-246.
  5. Lazić, V., Josifović, D., Jovanović, M., Validity of some formulae for calculation of cooling time during welding, Zavarivač (Welder), 40(2), 1995, Vol. 40 (1995), 2, pp. 89-94.
  6. Lazić, V., Optimization of the hard facing procedures from the aspect of tribological characte¬ri¬stics of the hard faced layers and residual stresses, (in Serbian), Doctoral Dissertation, The Faculty of Mecha¬ni¬cal Engineering, Kragujevac, 2001.
  7. Rikalin N. N., Computations of the thermal processes in welding, (In Russian), Mashgiz, Moscow, 1951.
  8. Milosavljević, M., Radojković, M., Kuzmanović, B., Fundamentals of Steel Constructions (in Serbian), Gradjevinska knjiga, Belgrade, 1986.
  9. Wernoski, A., Thermal metal treating (in Polish), Wydawnictwa Naukowo - Techniczne, Warszawa, 1983.
  10. Pasierb, R., Producing of chrome-molybdenum-vanadium steel (in Polish), WNT, Warszawa, 1982.
  11. Group of authors: Engineering Handbook - Welding (in Polish), WNT, Warszawa, 1983.
  12. Metals Handbook, Welding and brazing ASM, Metals Park Ohio, USA, 1979.
  13. Jovanović, M., Adamović, D., Lazić, V., Welding technology- handbook (in Serbian), Authors' edition, Kragujevac, 1996.
  14. Čukić, R., Techno-economical analysis of production and reparation hard facing of various parts of technical systems, (in Serbian), PhD thesis, Center for Multidisciplinary Study , The Belgrade University, Belgrade, 2010.
  15. Wasserman, R., How to save money with hard facing in machinery maintenance (in Serbian), Castolin Eutectic, Institute for technology improvement of hard facing and welding in machinery maintenance, Bor, Serbia, 2003.
  16. Čukić, R., et al., Techno-economical justification of the reparatory and production welding of heavy technical parts (in Serbian), 32. Serbian Production Engineering Symposium 2008., 18-20 September 2008, Novi Sad, Proceedings, pp. 225-229.
  17. Irisharri, A.M., Pelayo, A., Failure analysis of an open die forging drop hammer, Engineering Failure Analysis 16 (2009), pp 1727-1733.
  18. Desir, J.L., Examples of repair welding of heavy machinery subject to breakage due to low frequency alternating stresses, Engineering Failure Analysis 8 (2001), pp 423-437.
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