Influencia del fenómeno de penumbra producida por un generador de rayos x en el estudio y análisis de discontinuidades en probetas soldadas de acero

Abstract

The current study was performed with the purpose of showing the procedure employed to analyze the influence of the unsharpness phenomenon produced by an X-ray generator when studying and analyzing steel welded joints. There is a phenomenon that directly influences the welded joint quality when this one is inspected using the industrial radiographic technique. Due to this phenomenon, the real measurements of possible discontinuities inside a welding joint are distorted. In order to show the effect of this study, the collected information was used for the fabrication of welded joints through a SMAW welding process. Each of these samples contained a specific simulated discontinuity whose dimensions were created according to the acceptance or rejection criteria described on the API 1104 standard. After implementing a radiographic test to each sample, the dimensions of the simulated discontinuities presented on the radiographic films were measured using the software “ISee!” recommended by the ASTM E1165 standard. Through the comparison between the real and theoretical measurements, it was observed that the maximum unsharpness generated on X axis was on the samples with individual porosity (P) with a value of 0,1486 mm, while the maximum unsharpness on Y axis was generated on the samples with insufficient penetration (IP) which value was 0,0996 mm.