Study on edge effect of radiographic testing for Titanium alloy joint structure with large thickness difference

This paper presents a study on edge effect of radiographic inspection for Titanium alloy joint structure with large thickness difference. And due to the existence of the defects undetected caused by edge effect in practical situation, it is significant to investigate the impact of edge effect on radiographic examination of joint structure with such a large difference in thickness. The conventional process of radiography was employed and the width of edge effect was calculated with image processing software D-tect and imageJ following obtained digital images converted from film using high-resolution digital camera. The influence factors concerning edge effect were investigated encompassing tube voltage, tube current, exposure time, thickness ratio and angle between rays transmitting direction and surface of joint structure in practical radiographic examination. Moreover the fact that edge effect can be reduced remarkably by utilization of compensation material is proved.