Modeling by Finite Element Method of Thermal Field when Coating with Stellite Welding of Valvetype Parts

Abstract:

The paper presents the optimization results of coating by welding technology of the sealing surfaces of a rod-valve and seat assembly by using finite element programs. The assemblies - rod, valve and seat - are used for closing or opening track heat from heating systems used in power plants. The heat is given by steam that is found at a pressure of 400-450 atm and a temperature range of approximately 500°C. These values determine the use of materials of steels grades that are thermo resistant, alloyed with Cr and Mo, and work surfaces are coated with materials out of stellite grades (Co). To optimize parameters of the welding system and decrease heat loss, by conduction and convection, there were used programs of finite element to simulate the propagation of heat gradient acording to the parameters of welding regime.

• Periodical: Applied Mechanics and Materials (Volume 371)
• Pages: 260-264
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.371.260
• Online since: August 2013
• Authors: Gabriel Gârleanu, Victor Popovici, Delia Gârleanu, Cornelia Luchian
• Keywords: Finite Element Method (FEM), Thermal Analysis, Welding Technology

References

[1] MSC. Nastran Thermal Analysis User's Guide.

[2] J.R. Brauer, What Every Engineer Should Know About Finite Element Analysis, Marcel-Dekker, (1993).