1. SELECTIVE SOLDERING By Suntronic Inc.

2. WHAT IS SELECTIVE SOLDERING? Selective Soldering is the process of soldering components to the PCB. The components are selected based on a program that uses PCB images. Selective Wave Soldering machines help to achieve consistent quality and process control when assembling boards that have multiple grounds, power planes, or dense populations of SMT components on both sides. Our equipment is also set up to support both Tin/Lead processes and lead-free processes with interchangeable solder pots.

3. Step 1 - Program the selective soldering machine using centroid files which are derived from Gerber Files.selective soldering Step 2 - Boards that are to be soldered are kept on the conveyor belt and inserted in the machine. Step 3 - Flux is applied on the board to remove the oxidized metal layer. Which is then activated by heating the boards at 100 degrees. Step 4 - Each and every through-hole components are soldered on the board with the help of solder fountain. STEPS OF SELECTIVE SOLDERING

4. Size of PCB Solder Type Nozzles Nitrogen supply Solder Pots Solder Flux FACTORS TO CONSIDER FOR SELECTIVE SOLDERING PROCESS:

5. Selective soldering allows the operator to program the exact spots for applying the molten solder. Machine operators can easily set the temperature and solder amount. Selective Soldering produces reliable solder joints. Different parameters are set for each component to ensure effectiveness. It requires no expensive wave solder pallets. The overall process is cost-effective. ADVANTAGES FOR SELECTIVE SOLDERING

6. Wave soldering is the automated PCBA soldering process. It is also known as flow soldering, it is usually performed in a closed protective gas atmosphere. In this process the board passes over a wave of solder. The wave soldering process has following advantages: Easy Setup Rapid Process Low Costs WHAT IS WAVE SOLDERING?

7. DISADVANTAGES OF WAVE SOLDERING? Higher consumption of solder, flux and electricity Sensitive points on PCBs needs to be masked Post-wave solder rework increased Additional cleaning of wave solder aperture pallets or masks

8. It is generally recommended to choose selective soldering over wave soldering for through-hole assemblies for the following reasons: through-hole assemblies If tall components are involved then, they may stop the wave from soldering the board properly. Manual soldering becomes difficult when boards with thick copper layers for ground and power planes are involved. It becomes difficult to solder through-hole pins if placed in dense configuration. Wave soldering can produce excessive consumption of Nitrogen if Nitrogen is run during the process. WHY CHOOSE SELECTIVE SOLDERING OVER WAVE SOLDERING?

9. CONTACT US Suntronic has been providing expert PCB assembly services. Feel free to contact us today to know more about our selective soldering capabilities and other PCB assembly capabilities. Our experts would be happy to answer your queries regarding the services we offer and make the right decision regarding choice of components.PCB assembly services www.suntronicinc.com info@suntronicinc.com www.suntronicinc.com info@suntronicinc.com (281) 879-9562