Research On The Influence Of Temperature On The Uncertainty Of Ultrasonic Testing Of Q235A Carbon Steel By Diffraction Time Difference Method

The diffraction time difference method is a technique for quantitative detection of an ultrasonic diffraction signal based on Huygens principle.Because of its advantages of portable,high efficiency and wide range of detection,it is widely used for defect detection of metal materials in industry.But in the process of detection,it is difficult to ensure that the conditions of operation environment temperature are in use,so the influence of temperature on the result of the diffraction time difference method ultrasonic testing technology is difficult to define.Q235 A carbon steel has been widely used in industry because of its good welding performance and hot working properties.However,because the environmental conditions of its application are not fixed,especially in the welding area,it is easy to crack and other conventional defects.In order to ensure the normal operation and normal life of the equipment,Q235 A carbon steel needs regular inspection.In order to study the influence of temperature on the measurement result of the diffraction time difference ultrasonic testing technology,Q235 A carbon steel was selected as the tested material for quantitative detection of preset defects at different temperatures.The relationship between the temperature and the measurement results is determined by comparing the uncertainty and standard deviation of the multiple measured data at different temperatures.By comparing the measured results,it is found that the ability of measuring small defects by the method of diffraction time difference is decreased with the increase of temperature.The results are further verified by the evaluation of the uncertainty of the measurement results.