Introduction
This manual provides comprehensive instructions for the safe and efficient operation of your SUNKKO 737DH Battery Spot Welder. This portable and multifunctional equipment is designed for precision pulse welding, ideal for building 18650, 14500, and other lithium battery packs, as well as various metal welding applications.
Key Features
- First design with delayed welding function, offering 3-level power adjustment for precise welding.
- Induction automatic current release mode, specifically suited for battery pack welding.
- Adjustable pulse power knob to accommodate various welding part thicknesses.
- Real-time monitoring of current output via the display.
- Supports two welding modes: fixed welding head and movable welding pen.
Product Overview
Official Product Tutorial Video
This tutorial video from SUNKKO provides a detailed demonstration of the 737DH Battery Spot Welder's features and operation, including setup, mode selection, and various welding applications. (Duration: 4:29)
Setup
- Power Connection: Ensure the unit is placed on a stable, flat surface. Connect the power cord to the machine and a suitable power outlet.
- Main Power Switch: Locate the main power switch on the backside of the machine and turn it to the 'ON' position. The LED light on the front panel will illuminate.
- Power Button: Press the 'POWER' button on the front panel to initiate the spot welding function.
- Welding Head/Pen Installation:
- Fixed Welding Head: For the fixed welding head, adjust the pressure controlling knob to secure the welding needles.
- Mobile Welding Pen (S-70SN/S-70BN/S-71A/S-71B): Plug the mobile welding pen securely into the designated port on the front panel. If using a foot pedal, connect it to the corresponding port on the backside of the machine.
Operating Instructions
Understanding the Display and Controls
- The top screen displays the actual output current during welding.
- The second screen displays the welding current range and the number of pulses.
- Press the '*' button to adjust the corresponding twinkling value on the display.
- Press the 'T' button to select multiple time-delay spot welding settings (e.g., 0.4s, 0.5s, 0.6s, up to 1.5s superposition).
- Press the 'P' button to set the pulse numbers (2-18 pulses).
- Use the 'AT/MT' button to switch between Manual (MT) and Automatic (AT) spot welding modes.
- The 'SUPER PULSE' knob adjusts the pulse current for higher output, allowing for welding of thicker nickel strips.
Welding Modes and Applications
- Automatic (AT) Mode:
In AT mode, the output welding current is automatically triggered when the welding pen touches the welding part, eliminating the need for a switch. This mode is ideal for efficient, continuous welding of battery packs.
Welding a small-sized lithium-ion battery pack using the mobile welding pen in AT mode. 
Welding a 10S lithium-ion battery pack, demonstrating the versatility for different battery configurations. - Manual (MT) Mode with Foot Pedal:
In MT mode, welding is activated by pressing the foot pedal switch. This provides precise control over the welding process, ideal for specific applications or when fine control is required.
Spot welding large single power batteries after nickel conversion, showcasing the machine's capability for series and parallel welding. - Welding Various Materials:
Beyond batteries, the 737DH can weld various materials like stainless steel, iron, and nickel. This includes mobile phone internal parts, stainless steel sheets, and iron sheets.
Demonstration of welding mobile phone internal parts, highlighting the machine's versatility. 
Welding stainless steel mesh, filter, and other stainless steel parts. 
Welding the positive electrode of a polymer lithium battery, demonstrating conversion to nickel. - Specialized Welding Pens:
- S-71A Welding Pen: Features a smaller welding needle, ideal for small welding surface products and positive electrode caps of lithium batteries.
- S-71B Welding Pen: Designed for welding stainless steel mesh, filters, and other stainless steel parts.
Maintenance
- Regularly inspect welding pins for wear and replace as needed to ensure optimal performance.
- Keep the welding area and machine clean from debris and metal particles.
- Store the unit in a dry, cool environment away from direct sunlight and excessive dust.
- Ensure proper ventilation during operation to prevent overheating.
Troubleshooting
- No Power: Check power cord connection, main power switch, and ensure the 'POWER' button is pressed.
- Weak Welds: Adjust the 'SUPER PULSE' knob for higher current. Ensure welding pins are clean and making good contact with the material. Verify correct pulse and time-delay settings for the material thickness.
- Inconsistent Welds: Check for stable power supply. Ensure welding pins are not worn or misaligned. Clean the welding surface of the material.
- Foot Pedal Not Responding (MT Mode): Ensure the foot pedal is securely connected to the machine.
Specifications
| Attribute | Value |
|---|---|
| Manufacturer | SUNKKO |
| Part Number | 737DH |
| Item Weight | 14.63 pounds |
| Package Dimensions | 15.75 x 14.53 x 8.98 inches |
| Power Source | AC |
| Batteries Included | No |
| Batteries Required | No |
| Date First Available | September 12, 2020 |
Packing List
- SUNKKO 737DH Spot Welder Unit x1
- 70BN Welding Pen x1
- Foot Pedal Switch x1
- Fuse Tube x2
- Welding Pins x4
- Welding Pins for Welding Pen x2
- Hexagonal Wrench x1
- Mini Grinder x1 (Gift)
- Six-cells Battery Clamp Fixture x1 (Gift)
- Nickel Samples x100 pcs (Gift)
Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the official SUNKKO website or contact your authorized dealer. A detailed user manual in PDF format is also available for download: User Manual (PDF).
