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Wave Soldering

Wave Soldering
Details:
In Shenzhen STHL Technology Co., Ltd.'s production hall, the tin bath of a Wave Soldering machine surges with a steady, controlled wave of molten solder, carrying assembled PCBs slowly through it. In just a few seconds, hundreds of solder joints are simultaneously wetted and bonded, producing bright, smooth, and robust solder surfaces.

This process is not only the workhorse of our mass production lines but also an indispensable step in Through-Hole Wave Soldering and mixed assembly. Whether it's high-current connectors on industrial control boards or high-power devices in automotive electronic modules, STHL ensures that every joint remains stable and reliable under harsh conditions through precise temperature control and waveform management.
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Description
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What is Wave Soldering?

 

Wave Soldering is a batch soldering process in which a pump creates a stable wave of molten solder in the tin bath, allowing PCB pads and component leads to be soldered instantly as they pass through the wave.

  • Scope of Application: Particularly suitable for Wave Soldering for THT Components such as transformers, inductors, and connectors.
  • Hybrid Process: Can be combined with reflow soldering - SMT reflow on one side, wave soldering on the other.
  • Protective Atmosphere: Nitrogen wave soldering reduces oxidation defects and improves solder joint appearance.

 

Core Process and Equipment Components

 

1. Solder Bath and Waveform

  • Flat Wave: Ideal for large soldering areas.
  • Turbulent Wave: Improves wetting of complex solder joints.
  • Temperature Control: Lead-free solder (such as SAC305 for lead free wave soldering) typically requires 260 °C ±5 °C.

2. Equipment Structure

  • Conveyor System: Ensures stable PCB transport.
  • Flux Application: Spray or foam methods; spray provides more uniform coverage.
  • Preheating Zone: 65–121 °C to activate flux and reduce thermal shock.
  • Soldering Zone: Solder bath and pump form the wave pattern to complete soldering.

3. Solder Types

  • Lead-Containing: Sn63/Pb37, Sn60/Pb40.
  • Lead-Free: SAC305, Sn-Cu-Ni.
PCBA

 

Critical Process Parameters

Temperature
Adjusted according to component type; heavy-duty components may require up to 280 °C.
Flux
Removes oxides and reduces surface tension; applied before the PCB enters the solder bath.
Preheat Rate
2–4 °C/s to prevent PCB warpage.
Cleaning
Washable solder joints require post-solder cleaning with deionized water; no-clean types require evaluation of residue impact.

 

Quality Control and Inspection

 

At STHL, every PCB Wave Soldering process is paired with multiple inspection steps:

  • AOI: Checks peripheral solder joint position and solder paste print quality.
  • X-ray: Detects hidden defects such as cold joints, bridging, and voids.
  • IPC-A-610 Class 3 Compliance: Ensures soldering quality for high-reliability products.
X-ray machine

 

Process Variations and Application Scenarios

 

  • Selective Wave Soldering: Localized soldering for specific joints, ideal for mixed-assembly boards.
  • Industrial Control Boards: High-current through-hole component soldering.
  • Automotive Electronics: Meets automotive-grade temperature and vibration resistance requirements.
  • Home Appliance Main Control Boards: High-efficiency mass production.
  • Communications Equipment Backplanes: Multi-pin connector soldering to ensure signal integrity.
Industrial PCBA

 

Common Defects and Prevention

 

 

Voids

Optimize flux application and preheat profile.

 
 

Cracks

Control cooling rate.

 
 

Insufficient Solder

Adjust wave height and contact time.

 
 

Bridging

Optimize PCB layout and solder volume.

 

 

Summary and Collaboration Invitation

 

At STHL, we regard Wave Soldering assembly as a precision manufacturing process - not merely a mass soldering method. If your project requires both efficiency and high reliability in through-hole soldering, or demands consistent, high-quality joints in a lead free wave soldering environment, we welcome the opportunity to discuss process solutions with you.

 

Send us your design files, and our engineers will optimize manufacturability while our production team ensures delivery quality.

 

Contact us now: info@pcba-china.com - Let us deliver a high-standard Wave Soldering process that strengthens your product's performance and market competitiveness.

 

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