CDDP – Micro Resistance – Dual Pulse CD Spot Welders

Available models are CD200DP, CD400DP, CD600DP. The dual pulse industrial capacitive discharge (CD) spot welder provides a substantially larger amount of weld energy combined with a finer range of power adjustment. As with Sunstone’s other spot welders, the CDDP welders produces clean, strong welds. Pulse one heats the weld area to eliminate surface contaminants and seats the welding electrodes. Pulse two then makes a strong, secure weld. Both pulses occur within milli-seconds.

User manual



Available models are CD200DP, CD400DP, CD600DP.  Sunstone’s dual pulse capacitive discharge spot welders are the ideal product for many spot welding applications. They provide ample power for a large spectrum of applications- at an affordable price. The capacitive discharge spot welders offer a dual pulse feature that helps provide strong, clean, and repeatable welds.

Capacitive Discharge Spot Welder Features

  • Dual Pulse operation removes surface inconsistencies and contaminants
  • Single or Dual Pulse operation
  • Up to 90 welds/min at 60ws – Up to 156 welds/min at 40ws – Up to 164 welds/min at 20ws
  • Intuitive user interface

Capacitive Discharge Spot Welder Applications

  • Battery pack welding
  • Thermocouple welding
  • Copper aluminum and brass thin sheet and wire
  • Miscellaneous resistive applications
  • Automotive Welding Applications
  • Honeycomb Tacking
  • Cross wire welding
  • Copper, Aluminum, and Brass thin sheet and wire
  • Miscellaneous resistive applications

Available Upgrades for the CDDP Industrial Spot Welders

  • Roll-Spot Welding
  • High-Precision Energy Adjustment
  • Lock-Out Mode
  • PLC Ready


Our CD spot welders are perfectly designed to be robust and versatile for a large variety of applications and uses. In addition, we offer some optional upgrades for those customers who may have additional requirements for their particular project needs.

Roll-Spot Mode

The Roll-Spot mode is an upgrade that will turn your CD welder into a seam welder, similar to an AC seam welder. The main difference between the CD Roll-Spot mode and a true AC seam welder is that the CD Roll-Spot mode makes a series of welds in a close succession, whereas the AC will continuously deliver energy to the weld spot. The Roll-Spot upgrade is ideal for projects needing multiple welds in close proximity yet not needing a true hermetic seal. Watch a Roll-Spot Welding Video. Available on CD200DP, CD400DP, CD600DP, CD1000DP.

High-Precision Energy Adjustment

This upgrade allows for additional energy adjustment and fine-tunability. The standard CD welders can be adjusted from 0-30 watt-seconds by 1.0 watt-second increments. The High-Precision Energy Adjustment upgrade will allow the energy to be controlled by 0.1 watt-seconds from 0-15 watt-seconds, by 0.2ws from 15-35ws, by 0.2ws from 15-50ws, and by 1ws from 50-Max ws energy. For high-precision weld energy control, this upgrade is a must. Available on CD200DP, CD400DP, CD600DP, CD1000DP.

PLC Ready Mode

This upgrade makes the welders ready to interface with a PLC controller. This upgrade is most helpful for applications and processes that are already configured around a PLC in an automation or assembly line setup. Available on CD200DP, CD400DP, CD600DP, CD1000DP, Linear DC.