PCB wave soldering

　　In order to ensure that the surface of the board and the surface of the lead are quickly and completely soaked by solder, the flux must be coated. Generally, rose-scented flux or water-soluble flux with a relative density of 0.81 ~ 0.87 is used.

　　② The PCB circuit board coated with flux should be preheated, which should generally be controlled at 90 ~ 110℃. A good grasp of the preheating temperature can reduce or avoid the occurrence of pointed and round solder joints.

　　③ In the welding process, the solder temperature should generally be controlled within the range of 250 ° C ±5 ° C, and whether the temperature is suitable for directly affecting the welding quality; The Angle of inclination of the welding fixture into the crest should be adjusted to 6. Around; The welding speed should be mastered at 1 ~ 1.6n/min; Solder groove tin surface crest height is about lOmm, the peak is generally controlled in the board thickness of 1/2 ~ 213, too large will lead to molten solder flow to the surface of the PCB circuit board, forming a "bridge".

　　④ After the circuit board is welded by the wave crest, it must be properly cooled by strong wind.

　　⑤ The cooled circuit board needs to be cut off the component leads.