Capacitor Discharge Spot Welding Machine (Condenser Welder)
Product Overview
The Hwashi Capacitor Discharge Spot Welding Machine is a precision resistance welding system that utilizes high-capacity capacitors to store energy and release it instantaneously — delivering tens of thousands of amperes of current within milliseconds to achieve clean, high-strength welds with minimal heat input. This "store-then-discharge" principle ensures ultra-low thermal impact on workpieces, producing trace-free, distortion-free weld joints that require no post-weld grinding or finishing.
Ideal for stainless steel cookware, appliance components, hardware fittings, and decorative metal products where surface appearance is critical, this bench-top condenser welder combines Japanese-sourced capacitors, precision pneumatic pressurization, and an intuitive digital control interface into a compact, operator-friendly package — enabling even unskilled workers to achieve consistent, high-quality results from day one.
Key Features & Benefits
1. Instantaneous Capacitor Discharge — Zero-Trace Welding
- Discharge duration: <20ms — welding completes before heat can spread, minimizing workpiece deformation and discoloration
- Heat-affected zone: ultra-small — no blackening, no oxidation marks, no warping on stainless steel, aluminum, or coated surfaces
- Welds match base metal strength — verified by pull-force testing to parent material specifications
- Eliminates post-weld grinding, polishing, or surface rework — reducing labor cost and cycle time
2. High-Energy Japanese Capacitors
- Nippon Chemi-Con capacitors (Japan) — industry-leading reliability with 18-month maintenance cycle vs. 6 months for standard units
- Energy storage from 4,500J to 30,000J across model range — covering precision micro-welding to multi-spot projection welding
- Charging efficiency ≥93% (IGBT high-frequency charging) — saves 45%+ in annual electricity costs vs. conventional systems
- Stable energy output unaffected by grid voltage fluctuations — consistent weld quality shift after shift
3. Compact Bench-Top Design with Digital Control
- Integrated stainless steel work table with adjustable electrode stroke and closure distance
- Digital display panel — real-time monitoring of charging voltage, weld count, and system status
- Pressure gauge + air filter regulator for precise pneumatic force control (500kg–1,500kg range depending on model)
- Foot pedal / lever activation — hands-free operation for safe, repeatable welding cycles
4. Grid-Friendly & Energy Efficient
- Low grid demand — small-power charging transformer pre-loads capacitors; discharge draws zero grid current during weld
- 3-phase balanced input — no voltage dip or flicker, safe to operate alongside sensitive equipment in the same workshop
- Energy savings of 70%+ compared to conventional AC spot welders at equivalent weld strength
- No water cooling required on discharge transformer — forced air cooling sufficient for high-duty-cycle operation
5. Wide Material Compatibility
- Welds carbon steel, stainless steel (SUS304/316), aluminum, copper, brass, bronze, nickel, silver, and dissimilar metal combinations
- Suitable for spot welding, projection welding, ring projection welding, and hermetic seam welding
- Sheet thickness range: 0.1mm–3.0mm (varies by model and material)
- High-strength steel and hot-formed steel compatible — no special tooling required
Technical Specifications
| Parameter |
WL-C-7K |
WL-CD-15K |
WL-CD-25K |
| Power Supply |
AC 380V / 50Hz |
AC 380V / 50Hz |
AC 380V / 50Hz |
| Rated Power |
7 KVA |
12 KVA |
18 KVA |
| Energy Storage |
4,500 J |
8,000 J |
12,000 J |
| Capacitance |
40,500 uF |
60,000 uF |
10,800 uF |
| Pressurization Force |
1,000 kg |
1,200 kg |
1,500 kg |
| Electrode Stroke |
80 mm |
90 mm |
100 mm |
| Closure Distance |
180–280 mm |
150–250 mm |
130–230 mm |
| Platform Distance |
250 mm |
255 mm |
260 mm |
| Electrode Distance |
320–420 mm |
380–480 mm |
490–540 mm |
| Cooling Water |
3 L/min |
5 L/min |
10 |
