The core role of wave soldering is to contain plug-in components (THD) and part of the SMD components (SMD) of the circuit board for batch soldering, through the wave formed by molten solder, a one-time completion of the component pins and PCB pads of the electrical connection and mechanical fixation with the compatibility of the mixed components, high-efficiency mass production, patch soldering SMD soldering joints, is the interface between the electronic manufacturing process of the SMD process (reflow soldering) and plug-in processes It is the key link between the SMD process (reflow soldering) and the plug-in process in electronic manufacturing, and is especially suitable for the manufacture of circuit boards that need to take into account the plug-in components.