Why do through-hole components fail to solder correctly down onto the PCB?

I am an electrical engineer in a company. Recently I am developed a new product in lab and making a sample for further confirmation. When I solder TH component, feel a little troublesome. Any soldering expert to help?

PCB Assembly
September 13, 2023

(Even the soldering process is under the suggested temperature.)

1.Component’s lead temperature is too cold and cannot form a good solder join.

2.Through-Hole Dimensions on the PCB are insufficient (too small)

3.Physical damage to the solder joint after soldering
After soldering, some processes may cause physical stress and fracturing, such as installing a heat sink on the surface, or installing unfitted plastic case molding.

#PCB Assembly #THT PCB Assembly #Manufacturing

Oliver Smith

Oliver is an experienced electronics engineer skilled in PCB design, analog circuits, embedded systems, and prototyping. His deep knowledge spans schematic capture, firmware coding, simulation, layout, testing, and troubleshooting. Oliver excels at taking projects from concept to mass production using his electrical design talents and mechanical aptitude.

Oliver Smith

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Why do through-hole components fail to solder correctly down onto the PCB?

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