Control the amount of tin and time required for each soldering point precisely. It operates at a lower temperature than soldering iron welding and can reduce the thermal load on connected products. The welding result is fuller than that of wave soldering and has better penetration. The tin-dragging direction and angle can be adjusted freely to effectively control short-circuit phenomena. For components with high temperature requirements, targeted welding can be carried out to avoid component damage. The welding quality is more stable than that of manual and soldering iron station welding. It can be checked by pictures that be taken through video Direct teaching operation can be employed to save scanning or circuit design data and create programs. Data can be imported through PCB files. Manual operation can be used to input data. The top of the nozzle has multiple alignment functions. According to the size of the pad, it can be selected. Economical production is achieved without fixtures, and the startup time and replacement time are significantly reduced.