Abstract: In order to improve the welding quality,an automatic seam tracking system was designed based on the visual inspection. The welding inspection system consists of controller,rectifying motor,cross-sliding frame and welding gun,laser head and visual system. Firstly,the compensation process of weld deviation was discussed. Then,based on fuzzy control,a position correction algorithm for welding gun was proposed. In order to further improve the accuracy of seam tracking,a self-regulating module was used in the fuzzy controller,and its membership function can be adjusted according to the tracking state. Finally,the seam tracking test was carried out. The test results show that the welding seam tracking error can be controlled within 0.5 mm based on laser vision test,which has a great application prospect in the field of precision welding.