Fig. 1. Principle of the surface defect detection system

Fig. 2. Interference signal diagram

Fig. 3. Picture of the weld

Fig. 4. Scanning results of our system. (a) Two-dimensional contour map; (b) welding track map

Fig. 5. Inspection results of welding surface defects

Fig. 6. Inspection result of the pores

Fig. 7. Areas with qualified welding quality

Fig. 8. Missing solder area

Fig. 9. Misalignment welding