GX591 DIY Spot Welder Kit

🔧 Product description

The GX591 DIY Spot Welder Kit is a compact, digitally controlled spot-welding module designed for joining nickel strips to lithium-ion battery cells. It is suitable for assembling, repairing and rebuilding 18650, 21700 and other cylindrical battery packs, as well as for various DIY electronics projects.

The GX591 controller provides 99 adjustable welding-power levels, allowing the welding pulse to be matched to the nickel-strip thickness, power-source capability and surface condition. A three-digit LED display shows the selected power level and the voltage of the connected power source.

The high-current switching section uses 8 power MOSFETs. The manufacturer specifies a peak pulse welding current of up to 2400 A. Actual welding performance depends on the voltage, discharge capability and internal resistance of the external battery, as well as the cable length and quality of all electrical connections.

⚡ Main features

• 99-level precision welding-power adjustment
• Digital microcontroller-based operation
• Real-time power-source voltage display
• Combined spot welder and voltmeter functionality
• 8 high-current MOSFET switches
• Manufacturer-rated peak pulse current up to 2400 A
• Suitable for 0.1–0.2 mm nickel strips
• Automatic contact-triggered welding
• Adjustable welding-tip trigger delay
• Connection for an optional foot switch
• Audible operating and welding-cycle indication
• Compact design for portable DIY projects
• Very low standby power consumption

🎛️ 99-level power adjustment

The GX591 offers 99 selectable welding-power levels. Lower settings are intended for thinner strips and more sensitive cells, while higher settings provide a stronger welding pulse for thicker material or more demanding joints.

Begin with a low setting and increase the power gradually while performing test welds. Excessive power may burn through the strip, damage the battery casing or cause unnecessary heating of the electrodes.

📟 Digital display and voltmeter

The integrated three-digit LED display can show:

• the selected welding-power level;
• the voltage of the connected power source;
• configuration and operating-mode information.

The controller incorporates a 12-bit high-precision ADC and can therefore also operate as a DC voltmeter. The specified voltage display resolution is up to 0.01 V.

When the power source is connected, its voltage is displayed automatically.

🔩 Welding probes and cables

The kit uses components designed for high pulse-current transfer:

• flexible 12 AWG welding cables;
• copper contact connections;
• alumina-copper alloy welding tips;
• heat-shrink insulation tubes.

Low-resistance cables and contacts help reduce electrical losses and transfer more of the pulse energy to the welding point.

🔋 External power source

The GX591 does not contain an integrated high-power battery. It requires an external DC source capable of supplying a very high current for a short period.

Suitable power-source types may include:

• a 12 V automotive lead-acid battery;
• a high-discharge LiPo battery;
• a low-resistance lithium battery pack;
• an automotive jump starter capable of high pulse current.

A conventional laboratory bench power supply will normally not provide enough instantaneous current for effective spot welding.

Welding performance depends on:

• battery discharge capability;
• battery internal resistance;
• battery state of charge;
• cable cross-section and length;
• contact pressure and connection quality.

🛠️ Operating modes

The GX591 can work in an automatic contact-detection mode. When both tips are pressed against the nickel strip, the controller detects contact and releases the welding pulse after the selected delay.

Available delay modes include:

• AU0 – welding output is activated with practically no delay;
• AU1 – welding output is activated after approximately one second.

The delay allows the operator to position and press both tips securely before the high-current pulse is released.

Some GX591 versions also provide a connector for an optional foot switch. A foot switch gives the operator manual control over the exact moment of pulse activation.

🔋 Typical applications

The GX591 can be used for:

• assembling 18650 battery packs;
• joining 21700 and other cylindrical cells;
• repairing electric-bicycle batteries;
• rebuilding power-tool battery packs;
• manufacturing energy-storage and portable power packs;
• welding nickel strips to battery terminals;
• mobile-device battery repair;
• educational and experimental electronics projects.

📊 Technical specifications

Parameter	Specification
Model	GX591
Product type	DIY spot-welder controller kit
Input voltage	8–24 V DC
Recommended nominal voltage	Approximately 12 V DC
Controller operating current	Less than 20 mA
Standby power consumption	Less than 0.5 mA
Welding-power adjustment	99 levels
Number of MOSFETs	8
Maximum stated pulse current	Up to 2400 A
Supported nickel-strip thickness	0.1–0.2 mm
Voltage measuring range	8–24 V
ADC resolution	12-bit
Voltage display resolution	Up to 0.01 V
Display	Three-digit LED
Welding cable size	12 AWG
Triggering method	Automatic or optional foot switch
Automatic delay modes	AU0 / AU1
Controls	Two function buttons
Controller-board dimensions	Approximately 89 × 54 mm
Controller weight	Less than 100 g, depending on kit version

Note: The stated 2400 A value is a short-duration peak pulse rating, not a continuous operating current. Actual peak current depends on the external battery and the total resistance of the welding circuit.

📦 Typical kit without enclosure

Depending on the selected package, the kit may contain:

• 1 × GX591 spot-welder control board;
• 2 × welding probes;
• 2 × welding or connection cables;
• 2 × heat-shrink tubes;
• 1 × nickel strip for testing;
• 4 × mounting screws;
• 4 × nuts.

📦 Typical kit with protective enclosure

The enclosure version may additionally include:

• 2 × transparent acrylic panels;
• 4 × copper spacers or posts;
• 4 × copper fixing nuts;
• 8 × small enclosure screws.

Package contents may vary according to the supplier and selected product version.

🧰 Basic operating procedure

1. Check that the power-source voltage is within the 8–24 V range.
2. Connect the power cables with the correct polarity.
3. Securely attach the welding-probe cables.
4. Select a low initial welding-power level.
5. Position the nickel strip on the battery terminal.
6. Press both welding tips evenly against the strip.
7. Wait for the automatic pulse or activate the foot switch.
8. Inspect and mechanically test the weld.
9. Increase the power gradually if the weld is too weak.
10. Reduce the setting if the strip burns through or becomes excessively hot.

⚠️ Safety information

• Always observe the correct input polarity.
• Never short the two welding probes directly together.
• Keep the device away from flammable materials and liquids.
• Wear suitable eye protection.
• Do not touch the welding tips immediately after operation.
• Use the product only in a well-ventilated area.
• Never weld damaged, swollen or leaking battery cells.
• Tighten all high-current terminals securely.
• Do not exceed the permitted input-voltage range.
• Disconnect the power source after use.
• Protect the exposed circuit board and terminals against accidental short circuits.

ℹ️ Important information

The GX591 is an electronic DIY module. Its performance depends on correct assembly, reliable low-resistance connections and a properly selected power source.

The specified 0.1–0.2 mm welding range also depends on the strip material. Pure nickel normally requires more welding energy than nickel-plated steel.

Perform several test welds on equivalent material before assembling a complete battery pack. ```