Wave Soldering

Wave soldering is the through-hole and mixed-assembly soldering process where PCB underside contacts a controlled molten solder wave - it is widely used for high-throughput joining of through-hole components.

What Is Wave soldering?

• Definition: Board passes over one or more solder waves after fluxing and preheating stages.
• Primary Use: Best suited for through-hole components and selected bottom-side SMT parts.
• Process Variables: Wave height, conveyor speed, preheat, and flux chemistry determine joint quality.
• Defect Modes: Bridging, icicles, insufficient fill, and skips are key control targets.

Why Wave soldering Matters

• Throughput: Delivers fast soldering for high-volume through-hole production.
• Cost: Efficient for boards with many through-hole joints.
• Consistency: Well-tuned wave process provides repeatable barrel-fill performance.
• Limitations: Less flexible for dense selective patterns and heat-sensitive assemblies.
• Mixed-Tech Risk: Requires protection strategies for previously reflowed SMT parts.

How It Is Used in Practice

• Fixture Design: Use pallets or masks to protect sensitive regions during wave exposure.
• Parameter Tuning: Optimize preheat and dwell to achieve full barrel fill without bridging.
• Pot Management: Control solder alloy composition and contamination through regular analysis.

Wave soldering is a high-productivity soldering method for through-hole assembly operations - wave soldering performance depends on synchronized control of flux, preheat, wave dynamics, and alloy quality.