"Ultrasonic Testing Technology" is the core professional course of physical and chemical testing and quality inspection technology, which has been opened in Sichuan Engineering Vocational and Technical College for more than 20 years, and has cultivated more than 2,000 ultrasonic testing professionals for the society. At the same time, a stable team of full-time and part-time teachers was formed, and the "Twelfth Five-Year Plan" vocational education national planning textbook "Ultrasound Testing" edited by the main teacher of this course was born. The teaching team of this course has guided students to participate in the National College Students Nondestructive Testing (Ultrasound) Skills Competition for many times, and won the second and third prizes of the group and individual. In order to meet the requirements of the national modern education development strategy and meet the learning needs of online college students and practitioners in the whole society at any time and anywhere, the relevant content has been updated and supplemented in a timely manner, and a supporting online open course has been formed under the guidance of the general principle of "practical" and "sufficient". This course introduces the principles, equipment, and applications of ultrasonic testing technology. The main contents include the following aspects:
(1) Physical basis of ultrasonic testing: introduce the generation and propagation characteristics of mechanical vibration and mechanical waves, as well as the propagation and reflection laws of ultrasonic waves in materials. Understanding the physical basis of ultrasonic testing is a prerequisite for understanding this detection technology.
(2) Ultrasonic testing equipment: introduce the types, structure and working principle of ultrasonic testing equipment, such as analog ultrasonic detectors, ultrasonic testing probes and test blocks. Mastering the use of ultrasonic testing equipment is the basis for industrial applications.
(3) Ultrasonic testing process: introduce the determination method of ultrasonic testing instruments, probe frequency and wafer size and other detection parameters, which is a necessary condition for ultrasonic testing.
(4) Ultrasonic testing application: introduce the basic application of ultrasonic testing in the industrial field, such as ultrasonic testing of metal plates, forgings and welded joints. In addition, the key contents of the common standard NB/T47013 are also introduced. Mastering the application methods of ultrasonic testing is the key to achieving industrial inspection.
(5) Ultrasonic testing practice: introduce the use of ultrasonic testing instruments and their basic performance testing, AVG and distance-amplitude curve drawing, ultrasonic testing operations of forgings and welded joints, etc.Emphasizing the key points that should be paid attention to in these practical operations. Mastering these basic operation skills can help to quickly improve the level of ultrasonic testing technology.
The online resources supporting this course include course information, teaching content (including videos and supporting PPT), assessment plans, problem banks, discussion boards, announcements and other sections. Teachers try to use easy-to-understand text expressions in their lessons, avoid unnecessary and cumbersome formula derivation, and instead show relevant theories in the form of pictures, animations and life examples. Teachers pay attention to the relationship between before and after knowledge, and pay attention to the connection between theory and practice, so that the relevant theoretical knowledge is not boring, which is convenient for scholars to understand and absorb.
Through the study of this course, students will be able to master the basic principles and application methods of ultrasonic testing technology, and be able to non-destructively test materials in industrial applications to ensure product quality and safety.
