Preheating the circuit board to reduce thermal shock is a necessary step during welding, 

and it is recommended to preheat it to about 100-120 ° C. 

The welding temperature should be controlled below 260 ° C and the welding time should be shortened 

as much as possible to avoid capacitor failure caused by overheating. 

Use appropriate solder and flux, and ensure that the solder joints are uniform to avoid local overheating.

The life span of aluminum polymer capacitors is usually represented by a warranty period of thousands to tens of thousands of hours, 

but the actual service life is affected by various factors, including operating temperature, voltage fluctuations, and mechanical stress. 

High temperature is the main factor that shortens the lifespan of capacitors, and for every 10 ° C increase, 

the lifespan is approximately halved. Voltage fluctuations should be controlled within the rated voltage range, 

as over voltage can accelerate aging. In addition, mechanical vibration and impact also need to be considered, 

and reasonable design and installation can effectively avoid these problems.