In the open arc welding process, the common vision system is difficulty to achieve clear images due to the arc interference. To solve this problem, multi-exposure image acquisition and fusion method is proposed. Existing multi-exposure image fusion methods do not make the appropriate process for the welding images, so that the arc interference cannot be suppressed effectively. Aiming at the characteristics of the light intensity distribution of arc welding, the images were divided into arc region and non-ar...