A weld pool image segmentation method based on FCM cooperative CV model is proposed for the weld pool image of GMA-AM.The algorithm uses the FCM segmentation theory to set the initial position,and then uses the CV active contour model to extract the weld pool profile.The results show that the FCM-CV algorithm eliminates the problem that the CV model is sensitive to the initial position and can effectively extract the contour of the weld pool under different process conditions.Compared with the traditional segmentation method,the weld pool profile of FCM-CV is accurate,smooth and closed.Also,the algorithm can accurately extract the contours of the arc,scum and the tail of the weld pool,and it has good adaptability and stability.