argon arc welding and manual two-shielded welding belong to welding, and the basic skills are similar. Welding includes many kinds. To learn a technology well, we should not only lay the foundation at a certain point, but also make rapid progress as long as we enter the door. When we have the conditions to learn argon arc welding, we can get started quickly, and many skills are not overwhelming. Many jobs are not just a simple workpiece, but sometimes it is a combination of various welding methods. Therefore, one,