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Solder Bus Fluxing

SelectaFlux SC
SelectaFlux SC Retrofit for Solar Cell Solder Bus Fluxing


The SelectaFlux SC Retrofit system for solar cell fluxing offers ultrasonic accuracy and precise control for targeted selective flux coatings onto solder bus lines in Tabber Stringer machines. Fluxing and soldering electrical contacts in the Tabber Stringer process is crucial as it ensures that the connections between the silicon crystal and the conductive electrical contacts are optimal for electricity to flow between them properly. Durability of solder bus joints is key to ensuring the module’s quality and longevity.

SelectaFlux SC System Benefits:

  • Easily retrofits into all Tabber Stringer machines
  • Uniform controlled-velocity spray remains confined to target solder bus area
  • Compatible with ALL fluxes
  • Easily configured with PLC control systems
  • Reduced wasteful overspray and atmospheric contamination
  • Minimal servicing and downtime
  • Self-cleaning ultrasonic nozzle – no clogging
  • Spray pattern adjustable from 2 mm – 5 mm (0.080″ – 0.20″)
  • Wide range of delivery rates from 1 – 250 microliters/second

Solder Bus Fluxing

Fluxing and soldering electrical contacts is a crucial process as it ensures that the connections between the silicon crystal and the conductive electrical contacts are optimal for electricity to flow between them properly. This process is key to ensuring the module’s quality and longevity.

The SelectaFlux Retrofit ultrasonic fluxing system offers the highest degree of accuracy, precision, and fine line control in the industry.

Complete SelectaFlux SC System Includes:

  • Flux control module
  • Broadband generator
  • Electrical inputs and outputs
  • Digital display for nozzle power and liquid delivery pressure
  • Panel-mounted nozzle power
  • Flow rate and air pressure adjustments
  • Air shroud pressure control

Operating Principle

The SelectaFlux SC Retrofit system is a complete, ready-to-integrate selective fluxing system. It combines Sono-Tek’s unique Microspray ultrasonic atomizing nozzle with low-pressure air to produce a controlled, highly focused beam of spray. A separate control module handles input/output system functions.

Compressed air, typically at 1 psi, is introduced into the diffusion chamber of the air shroud,which produces a uniformly distributed flow of air around the nozzle stem.

The ultrasonically produced spray at the tip of the stem is immediately entrained in the air stream.

The spray envelope is bow-shaped. The width of the bow is precisely controlled by moving the nozzle tip closer or farther from the substrate surface. The distance between nozzle and substrate can be varied from near-contact to approximately two inches.


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