As we all know, cold solder joint is one of the common line faults of PCBA, so why does it happen?

One is improper production process: Due to improper production process so that it leads to an unstable state; (The component only looks like be soldered, but it's not actually.)

The other is burn-in phenomenon: The electrical appliances, after long-term using, whose components with more serious heating, its soldering spot is pretty easy to appear aging peeling phenomenon.

Thus, it’s much vital for us to pay more attention to the production process and board washing(cold solder joints can be founded), especially for those manual welding.