This course describes welding discontinuities and the science and application of visual testing (VT), penetrant testing (PT), magnetic particle testing (MT), radiographic testing (RT), and ultrasonic testing (UT). Topics include discontinuities and their causes, as well as the role of vision, capillary action, magnetism, radiation, and sound in VT, PT, MT, RT and UT respectively. The Science of Non-Destructive Testing is perfect for both students and welding professionals involved in inspection, supervision, or quality control.