AWithZ UF20B
10.5kW supercapacitor power, welds 0.4mm and copper
U-series flagship: 10.5kW / 1750A, 2×1000F actively-balanced supercapacitors, 40-second recharge at 15A, three trigger modes, 99 levels, welds 0.4mm nickel-plated steel and copper. 2-year warranty.
Before any lithium battery work, read the AWithZ Safety & Usage Guidelines ›
What people build with UF20B
Real works from the WeldWorld creator community
Highlights
Only brand-new supercapacitors
No refurbished or imported salvaged capacitors — brand-new automotive-grade supercapacitors run at rated voltage for double safety and stability.
10.5kW · 1750A · welds 0.4mm
Millisecond energy plus dual-pulse: Ni-plated/steel 0.4mm, pure nickel 0.25mm, copper 0.15mm (with flux).
15A high-current fast charge
The supercapacitor recharges in seconds, so continuous welding never waits or fades.
Three welding modes
AT auto mode (smart sensing, batch work) · MT hand-pen mode (precise triggering, fine work) · MT foot-switch mode (hands and feet together).
Weldable thickness (mm, MAX)
Lab maximums; results vary by material and environment.See all nine spec groups ›
Use cases
Compatible accessories
Related models
Share your experience
Tell us about issues with your UF20B, accessories you want, or feature ideas. Approved feedback earns an accessory coupon.