On the circuit board factory: SMT processing tin don't round the sake of what
On the PCB in SMT processing, welding welding tin is a key stage, associated with the performance of the circuit board design and elegant appearance, in the concrete production can cause poor tin on because some conditions, such as common on the spot welding of tin is not round, will immediately endangering SMTSMT patch processing quality. Dongguan Rocket PCB factory below small make up for the guys in detail on the circuit board factory SMT processing of spot welding of tin is not round. SMT processing of spot welding circuit board factory tin not round key reason: 1, the welding position enough solder paste, tin not fruity, appeared gap; 2, help in the solder paste soldering fluid help soldering fluid expansion rate is too high, very easy to crack; 3, help help soldering fluid wettability of solder paste can not so good, can not exceed the provisions of the tin the very good; 4, PCB circuit boards welding plate or SMD welding welding has a serious air oxidation condition, harm on tin actual effect; 5, the specificity of the run-off water in solder paste is insufficient, can't remove PCB solder or SMD welding welding air oxidation of chemicals; 6, if appear on the part of the spot welding tin not round, because will be the red glue before the application can't sufficient mixing, helps the soldering fluid and tin powder can be not enough; 7, when a reflow furnace heating time is too long, or heating temperature is exorbitant, led to the solder paste in help soldering fluid specificity is invalid. PCBA processing/SMT
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