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Micro Resistance - Dual Pulse CD Spot Welders

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  • $5,500.00

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.

CDDP Welder User Manual

CD Welders Datasheet

  • Sunstone Circle Protection Plan Subscription

    The best protection your investment has ever seen!


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.  Available models include: CDDP200, CDDP400, CDDP600. 

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

This product is also available online with Circle Plan!

    • Weight
      35 lbs
    • SKU
  • Footprint LxWxH
    22.8x48.2x30.5 cm
  • Power Options
    600ws, 400ws, 200ws

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.

Introducing the Sunstone Circle Protection Plan


For your welder, it's a scary world out there! Welders get dropped, get abused, or just stop working. You have to protect your welder for any unfortunate incident. And the Sunstone Circle Protection Plan is an innovative way to safeguard your welder investment.

The Sunstone Circle is much, much more than an extended warranty. Here's what a small monthly subscription will deliver in peace of mind and exceptional customer service:

Sunstone Circle Protection Plan

Forever Warranty
For as long as your welder is covered by the Sunstone Circle your warranty never expires. You’ll never deal with lifeless warranty extensions, but rather enjoy a forever warranty. And that’s a big circle of protection!

Complimentary Loaner
If you need a loaner unit while your welder is being repaired, we’ll send one. We’re going to do all we can to keep your production levels up. If you’re in the circle, we’ll take care of you!

Free Replacement
Sometimes it makes more sense to simply replace a welder with the newest model rather than make a repair. At Sunstone’s discretion, we’ll send you the newest model to keep your shop happy and healthy!

Free Software Upgrades
When your welder is powered by the latest software improvements your shop becomes more productive and capable. You’ll have access to all software upgrades when you join the Sunstone Circle!

Complimentary Shipping
Should your Sunstone welder ever need repair, we’ll cover the shipping costs for ground service within the United States. If you need it faster, simply pay the difference. Need it shipped internationally? Give us a call!

Expedited Customer Service
At Sunstone every customer is a VIP, but when you’re part of the circle your request for customer service gets moved to the front of the line. You get extra attention! Just another perk when you subscribe today.

More Valuable Member Benefits!
You’ll receive snazzy Sunstone swag, a subscription to Micro Welding Today magazine, invitations to VIP events, Inside the Circle e-newsletter, and new product trial opportunities. Call now to join the circle!

Learn More!

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We Deliver Worldwide

Shipping Terms

  1. Unless indicated otherwise in the Acknowledgment, Delivery shall be made EXW (Incoterms 2010), Shipping Point, including without limitation, freight, and insurance costs. If no delivery terms are specified on the Acknowledgement, the method of shipping will be at the sole discretion of Seller. Unless directed in writing otherwise by Buyer, full invoice value will be declared for all shipments.

We accept the following payment methods:

Return Goods Policy. 

Seller’s products may be returned to Seller for credit within thirty (30) days of the shipment subject to the following conditions.

Sunstone offers a 30-day return policy on all products. Before sending a product back please contact Sunstone to receive an RMA number. The RMA number should appear clearly on the outside of the package. Customers are refunded via check. Please note that a 10% restocking fee will apply to all returns. A 30% restocking fee will apply to all 3rd party products (laser welders, laser engravers, PW - AC Welders, and AVIO products). Additionally, all 3rd party products must be insured when sent back to Sunstone at the buyer’s expense. In some cases, a merchant fee may apply. Equipment damaged by improper use or insufficient shipping precautions will be charged additional fees.

*DADO Laser Welder – No cash refunds available for the dado laser welder. However, The Dado Laser Welder may be returned within 30 days for credit towards another Orion or Sunstone product.

*Argon tanks have a $35 restocking fee, the tank must be emptied and left open with the protective cap put in place. All hazardous material and compressed gas stickers need to be removed from the packaging as the empty cylinder is not hazardous and doesn't contain compressed gas.

*Refunds will not be issued for services that have already been rendered such as shipping, calibration, or trainings.

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