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(接上期)3.7非常规UT技术承压设备允许采用超声衍射时差(TOFD)技术取代射线照相进行检测,有关其使用方法和验收标准,早在十年前ASME规范1996版第卷第一分册中,就以规范案例的形式规定在案例2235-1中。在最新发布的2006增补版中,ASME规范对TOFD法的操作技术细节在第四章《焊缝超
(Continued) 3.7 unconventional UT technology Pressure equipment allows the use of ultrasonic diffraction time-of-flight (TOFD) technology instead of radiography to detect the use of methods and acceptance criteria, as early as ten years ago, ASME Code Volume 1996 Volume I , In the form of normative cases provided in case 2235-1. In the newly released 2006 supplement, the technical details of the operation of the ASME Code on the TOFD method are given in Chapter 4 "