FNIRSI SWM-20 is a portable 2-in-1 spot welder with dual pulse, high output power up to 1200 A and power bank function with 5000 mAh battery. It allows welding materials up to 0.5 mm thick and boasts a 2.4-inch TFT display, USB Type-C charging 5 V / 2.1 A and power bank function.

FNIRSI SWM-20 is a handheld battery spot welder with an output current of up to 1200 A, a 5 V / 2.1 A power bank function, support for welding materials with a thickness of 0.1-0.5 mm, a 2.4-inch TFT display and charging via USB Type-C. It is suitable for assembling battery packs, servicing electronics, replacing battery cells and repairing cordless tools.

It uses dual pulse technology, where the first pulse helps remove oxidation and reduce spatter, while the second performs the main weld. It allows you to set preheat, pulse, interval and sequential welding points, and for precise control, there is a rotary knob, 180-degree display rotation and an adjustable stand. In addition, it has two detachable copper welding tips, 8 protection functions, automatic shutdown and the ability to upgrade via USB Type-C.

– Double pulse for more stable and cleaner spot welding
– Maximum welding current up to 1200 A for working with various strips and sheets
– 2.4-inch TFT display with real-time voltage, temperature and settings display
– Adjustable preheat, pulse, interval and 1-9 consecutive welding points
– 5000 mAh power bank function with USB-A 5 V / 2.1 A output
– Adjustable stand, 180-degree screen rotation and non-slip silicone base

Technical features:

– Model: SWM-20
– Design: 2-in-1, spot welder and power bank
– Display: 2.4-inch TFT color display
– Control: rotary encoder
– Maximum welding current: 1200 A
– Welding thickness range: 0.1-0.5 mm
– Preset levels: 4 combined levels
– Adjustment accuracy: more than 10,000 levels
– Adjustable parameters: preheating, pulse, interval, continuous welding points
– Automatic shut-off: 0-99 min
– Software upgrade: via USB-C

Welding materials:
– Nickel
– Iron
– Stainless steel
– Nickel-plated steel: up to 0.4 mm
– Steel: up to 0.5 mm
– Pure nickel: up to 0.25 mm
– Iron: up to 0.3 mm
– Copper and nickel-plated copper: up to 0.1 mm

Power supply:
– Battery capacity: 5000 mAh
– Battery cells: 2x A-class
– Charging: 5V / 2.1A
– Discharge: 5 V / 2.1 A
– Number of welding cycles per charge: up to 1500

Connectivity:
– Charging and upgrading: USB-C
– Power bank output: 5 V / 2.1 A USB

Materials and execution:
– Removable welding tip
– Welding tips: 99.9% copper

Protection:
– Protection system: 8 protection functions
– Overtemperature protection
– Undervoltage protection
– Overcharge protection
– Over-discharge protection
– Short circuit protection
– Voltage stabilization
– Low temperature protection
– Impact protection

Package includes: 1x Fnirsi Smart Spot Welder Portable Dual-Pulse SWM-20, 1x Welding Head, 2x Replacement Tip, 1x USB Type-C Cable, 1x Nickel Strip, 1x Instructions

Dimensions: 230 x 150 x 70 mm
Weight: 0.6000 kg
Warranty: 12 months

Manufacturer:

Shenzhen FNIRSI Technology Co., Ltd.
8F, Weihuada Industrial Park C building West, Li Rong Road Da Lang Street, / Longhua District
518109 Shenzhen
China
jason@fnirsi.com

Data of the responsible person in the EU:

Tech Trade doo Trzin
Blatnica 8
1236 Trzin, Slovenia SL
info@techtrade.si

It is important to know

Before choosing the Fnirsi Dual-Pulse SWM-20 smart spot welder, it is crucial to consider whether its design and functionality match your high-end and precise tasks of welding small metal parts. Pay special attention to how much and what types of materials you will weld most often, as it is said that this type of tool is not universal for all tasks.

• It is effective for specialized use, but for highly varied or high-demanding tasks it may not replace larger or more robust devices.
• If you often perform precision welding in confined spaces, the compact design allows for better accessibility and control while working.
• The portable design is ideal for mobile users or those who need the tool in different locations, but it also means certain limitations in performance compared to stationary devices.
• Check the device's setting or adjustment options in advance based on your working needs - not every setting is optimal for every type of material or thickness.

Source of editorial recommendations: general verifiable guidelines for product selection.

In practice

🟢 Assembly or repair of electronic components

The tool is very suitable for precise joining of small metal parts, where precision and limited access to the workplace are required.

🟡 Field servicing of household appliances

Suitable with limitations – you can take the device into the field due to its portability, but in the case of very bulky or heavy materials, there may be limitations in power or capacity.

🟢 Working in confined or challenging spaces

The compact size allows use in narrow or hard-to-reach places where larger conventional welding machines are not suitable.

🔴 Welding of thicker or highly stressed metals

Less suitable – due to limited power and the specific design of the device, it is not suitable for robust construction tasks or welding thick metal profiles.

Answers to frequently asked questions

Is the device also suitable for precision work in electronics?

Yes, due to its size and ability to operate precisely, it is suitable for work where precision couplings are required.

What limits the usability of this portable device compared to larger models?

Portability means slightly less power and capacity, so it's not the best choice for welding very thick metals or working with demanding materials.

How does it perform when working in different locations?

Due to its light weight and compactness, it is suitable for users who frequently change jobs or need a handy device for the field.

Description updated: August 2026

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