Welding in the World

, Volume 46, Issue 1–2, pp 28–34 | Cite as

A New Software to Evaluate Preheat Temperature and Cost

  • L. Costa
  • R. Molfino
  • M. Scasso


Preheating is a method for preventing hard structures and cold cracking in fusion welding of steels. Its application requires time and money, so that an evaluation of minimal preheat temperatures may be interesting. The thermal, metallurgical and economic problems of preheating were studied in order to acquire the most complete and logical as possible knowledge of the phenomenon thus defined. On this basis an easy and flexible instrument was developed. Parameters involved in the evaluation of the preheating temperature (chemical composition, hydrogen content, plate thickness, heat input, steel strength, restraint) were investigated. Available methods for determining the preheating temperature are briefly listed. An Üwer-modified formula was developed. A method for evaluating preheating costs is given. The developed software is presented.

IIW-Thesaurus keywords

Preheating Temperature Evaluation Steels Computer programs Costs Process parameters Composition Hydrogen Thickness Energy input Influencing factors Reference lists 


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  1. 1.
    American Welding Society, “Recommended practices for local Heating of welds in Piping and Tubing”, 1990, AWS, Miami.Google Scholar
  2. 2.
    Bailey N., Coe F.R., Gooch T.G., Hart P.H.M., Jenkins N., Pargeter R.J., “Welding steels without hydrogen cracking (second edition)”, 1993, Abington Publishing, Cambridge.CrossRefGoogle Scholar
  3. 3.
    Blodgett W., “Calculating cooling rates of arc spot welds”, Welding journal, December 1987.Google Scholar
  4. 4.
    Croft D.N., “Heat treatment of welded steel structures”, 1985, Abington Publishing, Cambridge.Google Scholar
  5. 5.
    Gherard Frank, “Computing the preheating temperatures for welding”, Welding and cutting, April 1988.Google Scholar
  6. 6.
    Gaillard R., Debiez S., Hubert M., Defourny J., “Methods for the optimisation of the preheat temperature in welding”, “Rivista italiana della saldatura”, No. 6, November–December 1998.Google Scholar
  7. 7.
    Ivan Hrivnak: “Theory of weldability of metal and alloys”, Elsevier, Amsterdam-London-New York-Tokyo 1992.Google Scholar
  8. 8.
    Dieter Uwer, Helmut Hölne “Determination of suitable minimum preheat temperatures for the cold-crack-free welding of steels”, Welding and cutting, May 1991.Google Scholar
  9. 9.
    Jones B.K., Emery A.F., Marburger S.J., “An analytical and experimental study of the effects of welding parameters on fusion welds”. Welding Research Supplement to the Welding Journal, February 1993.Google Scholar
  10. 10.
    Ornig H., Shütz H., Klug P.: “Comparison of methods to determine necessary preheat temperature for high strenth weld metal”, doc. II-A-957-95 / IX-1829–96, 1996 International Institute of Welding.Google Scholar
  11. 11.
    Suzuky H., “Revised cold cracking parameter PHA and its applications”, doc. IX-1311–84, 1984, International Institute of Welding.Google Scholar
  12. 12.
    Haruyoshi Suzuki “Estimation of preheat temperature for pipeline welding based on small size cracking tests”, doc. IX-1704–93, 1993, International Institute of Welding.Google Scholar
  13. 13.
    Thier H., Eisenbeis C, Winkler R., “Investigations into the confidence level of the calculation of the minimum preheat temperature for multipass welding”, Welding and cutting, July 1997.Google Scholar
  14. 14.
    Voda M., Paraschiv E., “New formulae for determining the preheating temperature”, Sudura, April 1998.Google Scholar

Copyright information

© International Institute of Welding 2002

Authors and Affiliations

  • L. Costa
    • 1
  • R. Molfino
    • 2
  • M. Scasso
    • 1
  1. 1.Italian Institute of WeldingItaly
  2. 2.Genoa UniversityItaly

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