What is the principle of wave soldering
Posted by Kensen OuYang on April 2nd, 2019
Soft Brazing of Mechanical and Electrical Connections between Welding End or Pin of Components and Solder Pad of PCB for Printed circuit boards with pre-installed components through solder peak is realized by making the melted solder (lead-tin alloy) sprayed by an electric pump or an electromagnetic pump to form the solder peak required by the design or making Nitrogen injected into the solder pool to form. The smt wave soldering machine is mainly composed of conveyor belt, flux adding zone, preheating zone and wave soldering furnace. The flow of the work.
1. Spray wash-free Scaling powder on the breadboard The PCB, which has been inserted into the components, is embedded into the fixture. It is sent to the smt wave soldering machine at a certain inclination and speed by the device at the entrance of the machine. Then it is clamped by the chain claw which runs continuously, and the sensor is induced by the sensor. The spray head uniformly sprays back and forth along the starting position of the jig, in order that the surface of the bare pad, the through hole of the pad and the surface of the component pin are evenly distributed a thin layer of flux.
2. Preheating PCB board When entering the preheating zone, the welding part of PCB plate is heated to the wetting temperature. At the same time, the increasing temperature of components avoided the thermal shock when immersing in the molten solder. In the preheating stage, the surface temperature of PCB should be between 75 ~110 C.
3. Temperature compensation for wave soldering; In the stage of temperature compensation, the compensated PCB plate reduces thermal shock in wave soldering.
4. The first wave peak of the breadboard The first peak is the "turbulent" flow velocity of narrow nozzle, which has good permeability to the shaded welded parts. At the same time, the upward jet force of turbulent wave makes flux gas eliminated smoothly, which greatly reduces the defects of welding leakage and insufficient vertical filling. 5. The second wave peak of the breadboard The second wave peak is a slower "smooth" solder flow, which can effectively remove excessive solder on the terminals, making all welded surfaces wet well, and making full revision to the punching and bridging caused by the first wave peak. 6. Circuit Board Enters the stage of cooling The cooling system makes the temperature of PCB drop sharply, which can obviously improve the problems of void and pad peeling during lead-free solder eutectic production.
Muji is one of wave soldering machine manufacturer and wave soldering machine suppliers in China. They together push wave soldering machine for sale. We sincerely hope to cooperate with domestic and foreign businessmen to develop business and market to develop a win-win, mutually beneficial relationship to create a better future.
