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International Society for Industrial Process Tomography

8th World Congress on Industrial Process Tomography

Gamma ray CT and MCNPX Simulation Applied to Weld Structure Investigation

K. M. Oliveira1, C. C. Dantas1, R. A. S. Ferreira2, S. B. Melo3 E. A. O. Lima4, E. S. Barbosa5

1Department of Nuclear Energy, Federal University of Pernambuco – UFPE, Recife, PE, Brazil klebfisica@gmail.com

1Department of Nuclear Energy – UFPE, Recife, PE, Brazil ccd@ufpe.br

1Department of Mechanical Engineering – UFPE, Recife, PE, Brazil ras@ufpe.br

3Informatics Center CIN – UFPE, Recife, PE, Brazil sbm@cin.ufpe.br

4University of Pernambuco – UPE, Recife, PE, Brazil emathematics@gmail.com

5Federal University of Campina Grande – UFCG, Campina Grande, PB, Brazil enivaldo.sb@gmail.com

ABSTRACT

In the welding carried out with the application of heat localized changes can occur such as an interrupt or a violation of the expected structure of a weld. The discontinuities appear as dimensional, structural and can compromise the use of the joint. The steels considered here are hipoeutetoides, those with carbon content lower than 0.8 , and possess alloying elements such with silicon, which acts as deoxidizer, manganese, among others in lower proportion. The welds studied are submitted for metallographic analysis and disturbances observed in micrography are compared with the results of the tomography. MCNPX Monte Carlo N-Particle was used to simulate photons interaction in tomography process. In the MCNPX geometry, the sample defect was introduced, in order to test required method resolution. Therefore, a calibration with decreasing density and diameter of designs spheres allows the detection limit simulation of the analytical method. The data obtained with these procedures are stored in a TOMC database. Data matrix was analysed with gamma trajectories as variables, whereas, the rotation angles were the variables. The Pearson correlation coefficient calculated for the data matrix was analysed followed by multivariate technique that is based on a distance metric.

Keywords Gamma transmission, MCNPX, Hierarchical cluster, steel tubes

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