In recent years in Japan, the labor shortage has become serious problem in various fields of industry because of declining birthrate and aging. Among them, welding work requires training and qualifications to master the welding work, and it is one of the areas where personnel shortage is prominent. Therefore, utilization of information technology for welding skill training is expected. In this paper, we propose to utilize AR technology for welding skill training. We developed a system which can visualize the posture during welding and show a guide for welding in real space by using AR technology for training and supporting welding works.