1. Introduktion
The SUNKKO 737U is an intelligent precision pulse spot welding machine designed for welding 18650 battery packs and similar applications. It features double pulse welding technology for high energy and precise welding in milliseconds. Additionally, it includes a versatile USB charging and battery testing function, making it a multi-purpose tool for battery assembly and maintenance.

2. Sikkerhedsoplysninger og vigtige meddelelser
Læs venligst alle sikkerhedsinstruktioner omhyggeligt, inden du bruger apparatet, for at forhindre personskade eller beskadigelse.

- Strømforsyning: To ensure a stable power supply and achieve a good weld effect, do not use an active (extension cord or multi-outlet) socket. Always use a direct wall socket.
- Afbryder: Due to the instant large current during welding, the rated current of the tripping device of your leakage protection switch should be 40-63A. A rating lower than 40A may cause the circuit breaker to trip.
- Pressure Adjuster: Set the pressure adjuster to the correct parameter to ensure optimal welding results. Incorrect settings may lead to poor welding effects.
- Welding Pins Maintenance: Keep the surface of the welding pins clean. Regularly wipe off any oxide with sandpaper to maintain good conductivity and welding performance.
- Welding Pin Shape: Ensure the welding pin remains in a sharp shape for precise and effective welding.
- Normal drift: Do not be concerned about the lighting in the flash during operation. The spot welder is a high-power machine that discharges high current instantaneously. This moment typically lasts about 20ms and is considered normal.
3. Pakkens indhold
Bekræft, at alle nedenstående varer er inkluderet i din pakke:

- SUNKKO 737U Spot Welder Machine: 1 unit
- Welding Needle: 2 pairs
- Skruenøgle: 1 stk.
- Fuse Tube: 2 pcs
- Charging Wires: 2 pcs
- Fixture for 6 Batteries: 1 pc
- Nickel Strip (0.1*4*100mm): 30 pcs
- Nickel Strip (0.15*5*100mm): 30 pcs
- Brugermanual: 1 stk
- Garantikort: 1 stk
4. Specifikationer

Generel
- Model: SUNKKO 737U
- Type: Welding battery
- Anvendelse: 18650 battery pack welding
- Funktioner: Pulse spot welding, USB charging, Battery testing
Svejsedel
| Parameter | Værdi |
|---|---|
| Input bindtage | 110V / 220V ACV (selectable) |
| Magt | 2.8KW (Instantaneous) |
| Single Pulse Time | 0.5 ~ 5ms (Adjustable) |
| Double Pulse Time | 1 ~ 10ms (Variable) |
| Maks. Svejsetykkelse | 0.05 ~ 0.15mm (Nickel Strip) |
Opladningsdel
| Parameter | Værdi |
|---|---|
| Udgang Voltage | 5V |
| Udgangsstrøm | 0 ~ 3A (Max) |
| Udgangseffekt | 38W (50W Instantaneous) |
| Voltage Stabilitet | ≤ 1.5% (Setting) |
| Konstant Strøm | ± 2.5% (Setting) |
| Målefejl | ≤ 1.5% (Setting) |
Fysiske dimensioner
- Dimensioner (ca.): 140 mm (B) x 200 mm (H) x 245 mm (D)
- Portabilitet: Equipped with a portable handle for easy movement.
5. Opsætning
- Udpakning: Carefully remove all components from the packaging and verify against the 'Package Contents' list.
- Placering: Place the spot welder on a stable, flat, and non-combustible surface. Ensure adequate ventilation around the machine.
- Strømtilslutning: Connect the power cord directly to a wall socket. Ensure the wall socket's circuit breaker is rated for 40-63A to handle the instantaneous high current. Do NOT use extension cords or multi-outlet adapters.
- Svejsestifter: Ensure the welding pins are clean and sharp. If necessary, clean them with sandpaper. Insert them securely into the fixed welding head.
- Indledende inspektion: Before powering on, visually inspect the machine for any signs of damage.
6. Betjeningsvejledning

6.1 Punktsvejsning
- Tænd: Flip the 'POWER' switch to the ON position.
- Juster svejsestrømmen:
- The first and second digits on the 'SET WELDING CURRENT' display show the current volume.
- Use the 'UP' and 'DOWN' buttons to adjust the current.
- Press the '***' button to confirm your selection.
- Vælg pulstilstand:
- The display will show 'P1' or 'P2' blinking.
- Use the 'UP' and 'DOWN' buttons to select 'P1' for single pulse welding (welds once) or 'P2' for double pulse welding (welds twice).
- Press the '***' button to confirm your selection.
- Adjust Welding Needle Pressure:
- Use the 'WELDING PRESSURE ADJUSTER' knob (located on top) to set the desired pressure. The pressure can be adjusted from 200g to 700g.
- Adjust pressure based on the thickness of the workpiece to achieve a firm weld spot.
- Placering af emne: Place the nickel strip and battery in the desired position under the fixed welding head. For battery packs, use the provided fixture for stability.
- Initiate Welding: Once the current and pulse settings are confirmed (digits stop blinking), press the foot pedal switch to initiate the weld. The LED light function will assist in calibrating the welding spot.
- Welding Thicker Materials: For materials thicker than 0.1mm, it is recommended to use a higher current power setting and adjust the welding pressure accordingly.
6.2 USB-opladningsfunktion


- Tilslut enheder: The SUNKKO 737U features three 5V USB output ports. Connect your mobile devices, power banks, or other USB-powered gadgets to these ports using appropriate USB cables.
- Opladningsindikator: The 'USB CHARGER TEST' display will show the charging current (in Amperes) for the connected devices. This allows you to monitor the charging speed.
- Samtidig opladning: Du kan oplade op til tre enheder samtidigt.
6.3 Single Lithium Battery Testing
- Tilslut batteri: Use the provided charging wires to connect a single lithium battery to the designated battery testing terminals on the front panel. Ensure correct polarity.
- Skærm skærm: The 'USB CHARGER TEST' display will show the charging current for the single lithium battery, allowing for testing and monitoring of its charging status.
7. Vedligeholdelse
- Svejsestifter: Regularly inspect the welding pins for wear, oxidation, or dullness. Clean them with fine-grit sandpaper to remove any oxide layers. Reshape dull pins to a sharp point for optimal performance. Replace severely worn pins.
- Generel rengøring: Keep the machine clean and free from dust and debris. Use a dry cloth to wipe down the exterior. Do not use liquid cleaners directly on the machine.
- Opbevaring: When not in use, store the spot welder in a dry, cool place, away from direct sunlight and moisture.
- Strømledning: Periodically check the power cord for any damage or fraying. Replace if necessary.
8. Fejlfinding
- Maskinen tænder ikke:
- Ensure the power cord is securely plugged into a direct wall socket.
- Check the 'POWER' switch is in the ON position.
- Verify the wall socket is functional.
- Afbryderudløsninger:
- This is likely due to the instantaneous high current during welding. Ensure your leakage protection switch has a rated current of 40-63A. Lower ratings (e.g., below 40A) will cause tripping.
- Avoid using extension cords or multi-outlet adapters.
- Poor Welding Effect (Weak or Inconsistent Welds):
- Svejsestifter: Clean the welding pins with sandpaper to remove oxide. Ensure they are sharp.
- Pressure Adjuster: Adjust the welding needle pressure correctly for the material thickness.
- Nuværende indstilling: Increase the welding current if the material is thicker, especially for materials over 0.1mm.
- Strømforsyning: Ensure a stable power supply by using a direct wall socket.
- USB-opladning virker ikke:
- Ensure the machine is powered on.
- Kontroller USB-kablet og den enhed, der oplades.
- Verify the 'USB CHARGER TEST' display shows a current reading.
- Flash/Spark During Welding:
- A brief flash or spark (lasting about 20ms) is normal due to the instantaneous high current discharge. This is not an indication of a fault.
9. Brugertips
- Øv dig først: If you are new to spot welding, practice on scrap nickel strips and old batteries to get a feel for the current and pressure settings before working on your main project.
- Optimal Current: Experiment with current settings. A good weld should be strong but not burn through the nickel strip or battery terminal. Start with lower settings and gradually increase until a satisfactory weld is achieved.
- Konsekvent tryk: Apply consistent downward pressure on the welding head. The adjustable pressure knob helps maintain this consistency.
- Battery Fixture: Always use the provided 6-battery fixture when assembling battery packs to ensure proper alignment and stability during welding.
- USB-opladningskomfort: Utilize the multiple USB ports to charge your devices while working on welding projects, making the workspace more efficient.
10. Garanti og support
This product comes with a warranty card included in the package. Please refer to the warranty card for specific terms and conditions regarding coverage and duration.
For technical support, troubleshooting assistance beyond this manual, or inquiries regarding parts, please contact the seller or manufacturer directly. Keep your purchase records and warranty card handy when seeking support.





