Table 5.

Classification results of the PCA-SVM model for natural weld defects.

Defect types	Number of Images	Train Samples	Test Samples	Recognition Result	Classification Accuracy/%
Crack	250	200	50	43	86
Pit	250	200	50	46	92
Lack of penetration	250	200	50	47	94
Gas pore	250	200	50	44	88
No defects	250	200	50	49	98
Total	1250	1000	250	229	91.6