In a mathematical model of the thermal process in the electrofusion welding of gas-line polyethylene pipes, it is proposed that phase transition in a range of temperatures be taken into account. By comparing theoretical time dependences of temperature with experimental dependences, the effectiveness of this approach to determining the temperature field dynamics in the welded joint is shown.
Get full access to this article
View all access options for this article.
References
1.
SP 42-103-2003. The design and construction of polyethylene gas-line pipes and the reconstruction of worn gas pipelines. Polimergaz, FGUP TsPP, Moscow, 86 pp. (2004).
2.
StarostinN.P., Russian Patent No. 2343331, RU F16L 13/00, 47/00. A method for welding polymer pipes. Institute of Oil and Gas Problems, Siberian Section, Russian Academy of Sciences, 2006144681/06; application 14.12.2006; published 10.01.2009. Bull. No. 1.
3.
AmmosovaO.A., The butt welding of polyethylene pipes at air temperatures below the standard. Part 1. Plast. Massy, (9): 38–41 (2008).
4.
AmmosovaO.A., The butt welding of polyethylene pipes at air temperatures below the standard. Part 2. Plast. Massy, (10): 45–46 (2008).
5.
GorislavetsV.M., The dynamics of melting polyethylene in a welded joint produced using a fitting with a built-in heating element. Avtomat. Svarka, (10 (379)):28–32 (1984).
6.
VabishchevichP.N., Numerical methods for solving problems with a free boundary.Moscow State University, Moscow, 164 pp. (1987).
7.
SamarskiiA.A., and MoiseenkoB.D., An economic continuous calculation scheme for the Stefan multidimensional problem. Zh. Vych. Mat. Mat. Fiz., 5 (5): 816–827 (1965).
8.
GorilovskiiM.P., Investigating the crystallinity and thermal stability in pipes produced from different types of polyethylene. Plast. Massy, (5): 9–12 (2005).
9.
AvdoninN.A., Mathematical Description of the Crystallisation Process.Zinatne, Riga, 180 pp. (1980).
