超声波高温检测在铸钢件上的应用

摘要

铸钢件在缺陷焊补过程中需预热、焊后冷却、超声波检测等工序,当超声波检测发现缺陷后仍需重复预热、冷却工序,这造成了焊接周期较长的问题.为减少铸钢件的焊接周期,研究和分析超声波高温检测中的声学特性,确定并验证了适用于铸件超声波高温检测的温度、检测灵敏度、缺陷定位差异等参数.%Repair welding process of the steel casting consists of preheating, cooling after welding, and ultrasonic testing, etc. When the defects were found after ultrasonic testing, the process of preheating and cooling needed repeating, which resulted in the longer period of welding. To decrease the period of welding of steel casting, the acoustic characteristics of the ultrasonic testing were studied and analyzed at high temperature. The testing temperature, testing sensitivity, and defects location difference between high and low temperature were determined and validated, which were adapted to the high temperature testing of ultrasonic for steel castings.