Factors Affecting Wave Soldering Quality in PCBA

 Wave soldering is a soldering method widely used in PCBA manufacturing, mainly for through-hole and mixed assembly processes.

The final soldering quality is affected by multiple factors, including wave soldering equipment, soldering materials, PCB, and more. Below is a detailed analysis.

1. Wave Soldering Equipment Factors

Equipment conditions are one of the main factors affecting wave soldering quality, primarily including:

flux spraying, temperature control in each heating zone, and conveyor stability.

During wave soldering, flux nozzles must be cleaned and replaced regularly, and spraying time must be properly set to avoid uneven flux application, which causes quality defects.

A typical wave soldering machine has four heating zones: preheating zone, temperature rise zone, high-temperature zone, and cooling zone.

Each zone has different temperature and duration settings. Proper parameter configuration is essential to prevent defects such as solder explosion.

2. Soldering Material Factors

Wave soldering uses various materials including solder, components, and flux.

Unlike reflow soldering, wave soldering uses solder bars as the filler metal.

  • Solder alloy: The composition ratio and impurity content of solder bars directly determine soldering quality.
  • Flux: Insufficient flux activity reduces solder wettability and fails to clean the soldering surface, resulting in defects such as inadequate solder joints.

3. Component and PCB Factors

  • Components: Oxidation, oil contamination, or other fouling on component leads or plating cause cold joints and poor soldering.
  • PCB: Oxidized solder pads, poor board flatness, or moisture absorption due to improper storage lead to soldering defects including cold joints, solder balls, and voids.

In addition to the above, PCB design (e.g., pad spacing) and production process control also directly affect the final wave soldering quality.

If you would like to know more about the PCBA knowledge, please email Sandy at sales9@hitechpcb.com

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