FNIRSI SWM-20 Portable Spot Welder

Dual-Pulse Technology | 2.4-Inch Display | Type-C Charging | 5000mAh Battery

The FNIRSI SWM-20 is a portable handheld spot welder designed for battery tab welding and thin metal joining using controlled pulse output.

It is commonly used for welding nickel strips to battery cells (18650, 21700), offering adjustable pulse parameters, dual-pulse control and compact cordless operation.

Key Features

• Dual-pulse welding: preheat and main pulse improve weld stability and reduce spatter.
• Adjustable parameters: rotary encoder allows precise tuning of welding energy.
• Display interface: 2.4-inch screen shows welding parameters and status.
• Built-in battery: 5000mAh capacity for portable operation.
• Power bank function: supports 5V output for external devices.
• Protection system: includes undervoltage and overheating alerts.

Technical Specifications

• Model: SWM-20
• Battery capacity: 5000 mAh
• Charging: 5V / 2.1A (Type-C)
• Output (USB): 5V / 2.1A
• Peak welding current: up to 1200A
• Display: 2.4-inch screen
• Control: rotary encoder
• Preset modes: 4 levels

Supported Materials and Thickness

• Pure nickel strip: up to 0.5 mm
• Nickel-plated steel: up to 0.4 mm
• Steel / iron sheet: up to 0.3 mm
• Copper / nickel-plated copper: up to 0.1 mm

Notes

• Do not use in flammable or explosive environments.
• Low battery level may reduce welding performance.
• Welding during charging is not recommended.
• Clean electrode tips regularly for stable operation.

Package Includes

• 1 × FNIRSI SWM-20 Spot Welder
• 1 × Welding Pen
• 1 × USB Type-C Cable
• 1 × Nickel Strip Sample
• 2 × Replacement Welding Tips
• 1 × User Manual

The FNIRSI SWM-20 provides a compact and adjustable solution for battery pack assembly, prototype work and light-duty spot welding applications.