Fig 5. Comparison of evaluated spot weld nugget shape for specimen 1 and 2 using 5 MHz and 10MHz frequency probe with the actual nugget shape obtained from destructive test and radiography test. (a) Ultrasonic test (sample 1 using 5MHz probe). (b, c) Ultrasonic test (sample 1 and 2 using 10MHz probe). (d, e) Actual nugget shape obtained from destructive test (sample 1). (f) Actual nugget shape obtained from destructive test (sample 2). (g, h) Nugget shape obtained from radiography test (sample 1). (i) Nugget shape obtained from radiography test (sample 2).