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.