Why some PCB solder service life is short? They are occured bad welding phenomenon after a period of time led the electric device bad.Today, let's analyze the main reasons.
PCB poor welding analysis:
PCB surface pad or SMT be oxidated lead to poor solder.
PCB has dusty or oily materials on
With the development of science and technology, technical requirements, and now more and more circuit board using surface mount components, compared with the traditional package, it can reduce the area of the circuit board, easy batch processing, high density wiring.The chip inductance of chip resistor and capacitor is greatly reduced,
PCB design and manufacture is critical and don’t allowed any mistake.The article will analyses why occurs rough unshaped welding in PCB assembly.
There have many factors lead to rough unshaped welding,like PCB PTH weldability, welding temperature incorrect,solder components incorrect,etc. It’s unfavourable for PCB components running,so we must avoid rough unshaped welding.
PCB PTH
If the vias is too close to pad, solder will flow out through via when make reflow soldering,lead to false weld.
Countermeasure: Move vias to 0.2mm far away from pad.
This kind of question always happened to PCB design. Engineer had to save space for boards limited by dimension. But it may
