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The reason and solution of cold welding on SMT patch

285 Published by FASTPCBA 11月 20,2018

The reason and solution of cold welding on SMT patch

In the welding defects of SMT patch processing, cold welding is rare, but the hazard is great, because it affects the long-term stability of the product, and the problems of electrical connectivity often appear in the hands of customers.The cold welding phenomenon of SMT patch processing is mainly reflected in the outer or inner cracks or gaps of solder plates and components.This crack and notch does not affect the online testing of the product, and the electrical connection is normal after SMT SMT processing.However, in the hands of customers, due to the influence of uncontrollable factors, such as continuous use, overcurrent or overpressure, and harsh service environment, cracks or gaps are amplified and broken, thus causing undesirable products.

SMT

SMT

 

SMT processing of cold welding principle and the reason is that in the process of welding, reflow reflow solder) (usually of furnace temperature curve set unreasonable, cause temperature speed up or speed down, solder paste from the paste into liquid, and then from a liquid into a solid in the process of solder paste uneven tension, cold welding phenomenon.It’s like a sword that breaks when it’s not hardened properly.To avoid cold welding of SMT patch, we need to set the furnace temperature curve of reflow welding correctly to ensure the temperature rise and fall steadily and avoid sudden rise and sudden drop.

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