Induction soldering of PCBs with soldering paste

PUBLISHED: 17 Jul 15

Soldered jumpers
Soldered jumpers

The customer uses a manual solder process. The current time to join 7 PCB's is 1 minute 45 seconds. It does not include the time to apply the solder paste and place the jumper across the PCBs in the paste. Our goal is to reduce the time while producing a high quality solder joint.

UltraHeat UPT-S5
5 kW, 50-200 kHz
HS-4 Heat Station
Two-turn custom designed coil


  • Soldering wire
  • Soldering paste

Application of the solder paste with a stencil is recommended. This will provide improved process control, better repeatability, and avoid any residues.

Key Parameters
Temperature: 300°C
Power: 3 kW
Time: 14 sec for joining 7 boards

200 kHz

Process: 1. Apply the solder paste on the pads of the printed circuit boards.
2. Place the copper jumpers in the solder paste across the pads of the adjacent PCBs.
3. Position the induction coil over the copper jumpers and pads.
4. Apply power to the UPT-S5, and heat for 2 sec. That's the time to heat one joint, and join 2 boards.
5. Confirm electrical continuity of across the jumpers by testing LED's on the printed circuit boards.


Induction heating provides:

  • Strong durable joints
  • Selective and precise heat zone, resulting in less part distortion and joint stress
  • Less oxidation
  • Faster heating cycles
  • More consistent results and suitability for large volume production, without the need for batch processing
  • Clean and safe heat application, without pollutants


Ultraflex Power Technologies, USA
Tel: + 1 631 467 6814

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