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When soldering circuit board components, what phenomena indicate that the soldering is defective?

2025-06-30

1. False soldering: The solder joint is not smooth and appears honeycomb-like. The solder joints have poor contact with the pins and pads.

2. Missed soldering: Some pins are soldered without solder.

3. Continuous soldering: Solder bridging, bridging, etc. occur between circuits or solder pads.

4. Overheating: The solder overheats, causing deformation and breakage of components. The solder pads or copper-clad laminates are lifted up; A monument has been erected for surface mount components.

5. Tin-permeable: For double-layer plates and above, through-holes should be tin-permeable and soldered to ensure connection.

6. Dirt: If the flux or cleaning agent is not removed thoroughly, it can easily lead to short circuits or corrosion of the circuit board

7. Less tin; There is less than or equal to 50% of the solder pad.

8. Loopholes When soldering, excessive force was applied and the insulating paint on the surface of the surrounding PCB fell off.

9. Bulge; During soldering, due to moisture inside the PCB, a small area of the PCB bulges.

10. Pinhole There are small holes on the surface of the solder joint or voids exceeding 25% of the pad when inspecting X-R (which can be passed in my standard).

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When soldering circuit board components, what phenomena indicate that the soldering is defective?

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Cases

SMT Pick And Place Machines

PCB Handling Machine

SMT Machine Spare Parts

Feeder Calibration Jig

SMT Head Unit

SMT Feeders