kWeld Spot Welder Full Kit — Build Your Precision Spot Welder

The kWeld Spot Welder Full Kit is your all-in-one kit to assemble a high-performance resistance spot welder — trusted in lithium-ion battery pack building workflows. Manufactured in Germany by keenlab and now available through Grid Rewired, this kit gives you the components needed to weld nickel flat wire or nickel-copper sandwich strips with precision and consistency.

⚙️ What’s Included

• PCB & Joule-based control module (assembled cables included) — no soldering required.
• Bus bars, fuse, nuts, bolts, pedal switch — everything you need except the housing.
• Compatible with both our laser-cut housing or a 3D-printed enclosure (housing options sold separately).

📋 Key Performance Features

• Wide input voltage range: 4–30V DC — allows flexibility in power source selection.
• Welding current from ~800A up to ~2000A, depending on your chosen power setup.
• Efficient on thin materials: successfully used with 0.1-0.4 mm nickel strip, and even 0.1 mm copper (sandwich).
• Joule-setting control: delivers consistent welds by measuring the total energy per weld rather than time alone.

📦 Who It’s For

This kit is ideal for battery pack builders, electric vehicle hobbyists, labs, and DIY makers who want a proven, high-quality spot welder. If you value control, precision, and the ability to weld demanding thin materials, this full kit gives you what you need to build up a serious setup.

🔧 What You’ll Need to Complete Your Welder

• Select a suitable power supply capable of delivering high current (kWeld supports a broad voltage range, up to 30V DC).
• Choose a housing for safety and ease of use — either a laser-cut housing or 3D-print one using this file.
• Consider adding accessories like a kCap or two and a kSupply for high repetition rate welding with plug in the wall convenience.  For a discussion of the most popular power options, please read this article from our Q&A section.,

✔️ Why Choose This Kit

• Manufactured in Germany with precise quality control by keenlab.
• Excellent community and technical support — forums and battery builders often compare kWeld favorably.
• Modular and customizable parts allow you to upgrade components (power source, housing) over time.
• Cost-effective vs buying a pre-built high current spot welder with lesser flexibility.

Make sure to read our power source guide in the Q&A section so you can confidently pick the right supply for your application.  Click here to download the 3D printed housing STL file.