Sunkko 737G User manual

Model: 737G
Thank you for choosing Sunkko 737G battery spot welder, let's now make the
building of Lithium battery pack for our ebike more convenient and efficient.

Summary
737G is our basic model which enjoys a good reputation and is highly evaluated by
our beloved customers. It is specifically designed for battery welding (18650, 14500
and any other lithium batteries, etc) and can be used to weld nickel strips with
thickness between 0.05 and 0.2 mm for nickel plated steel or between 0.05 and 0.15
mm for pure nickel strip. With the built-in LED light, you can even work at night.
This model can meet the basic needs of users for battery spot welding, is an entry-
level product.
◆Now let’s talk about the welding part.
1. The 737G welder can weld nickel strip with thickness under 0.2mm for nickel plated steel,
or 0.05 - 0.15 mm for pure nickel strip.
2. Two ways of welding: fixed welding head; fixed welding head with foot pedal.
You can build your battery pack with the fixed welding head, in this case, you need to
adjust the pressure adjustor to make the spots more reliable and elegant.
Different users may have different welding habits, so we added a foot pedal to 737G.
Coordinating hands and feet at the same time will also make the long-term spot welding
process not so tiring, plus the use of foot pedal during battery welding improves the
precision of spot welding.
In general, there are two methods to improve the output power of spot welding:
adjusting welding current level through buttons or adjusting pulse quantity. You may
need to play with them a bit to get the best combination for your specific use.
(Attention: This spot welder can be used to weld pure nickel, nickel plated steel,
nickel plated iron, iron and other alloys. It CANNOT weld metal like copper and
aluminum.)
Specification for welding part:
Input voltage: AC 110 V±10%
Welding current: 50 ~ 800 A
Single pulse time: 5ms
Current level: 99
Max. pulse quantity: 2
Max. power output: 2.88 KW (instantaneous)
Welding thickness for nickel plated steel: 0.05 ~ 0.2 mm
Welding thickness for pure nickel: 0.05 ~ 0.15 mm

Preparation steps before welding:
1. Fit the fixed welding head with copper welding rods before the machine powers on.
2. Turn on the power switch.
3. Adjust the pulse quantity and welding current level to make the spots more reliable and
elegant.
How is the pressure knob works?
The pressure knob regulates the pressure between copper welding rods and nickel
strip. Generally speaking, the thinner the nickel strip, the smaller the pressure. A
proper pressure between nickel strip and welding rods can also make the spots more
elegant.
◆Packing List:
Main machine:1pc
Copper welding rods:2 pairs
Battery fixture(6 section):1 pc
Foot pedal:1 pc
Fuse(30A):2 pcs
Hexagon wrench:1 pc
0.15x5x100mm(nickel plated strip):30 pcs
0.1x4x100mm(nickel plated strip):30 pcs
◆Notice
1. When building battery pack with Sunkko welders, if the home circuit system keeps
tripping, please replace your Circuit Air Breaker. For 110V version machine, the Circuit Air
Breaker in your circuit system should be higher than 40 A.
2. Please put on gloves and mask during your battery pack welding process to protect
yourself(Sparks may occur during welding process).
3. Unplug the welder when you are not using the welder.
4. During your welding process, the instantaneous large current generated by the welder
may cause the lighting equipment under the same power system flash and it is considered
normal.
5. Do not short circuits during spot welding or charging.
6. Do not use Sunkko welders with a voltage transformer as Sunkko welders are not
compatible with the common voltage transformers in the market.
7. Continuously spot weld too fast will speed up the loss of internal components of the spot
welder. We recommend that the time between each spot welding should be 3 seconds
or longer.
Warranty information
1. What is covered?
This limited warranty covers defects in main machine.

2. What is not covered?
✓The warranty does not cover any damage caused by the owner modifying,
attempting to fix, or otherwise altering the machine.
✓The consumable accessories are not in coverage, such as welding pen,
cooper rods and nickel strips.
3. How long does this coverage last?
The warranty lasts one year since the date of original purchase of the product.
4. Who is covered?
This limited warranty covers only the original purchaser of the product on
sunkko.net. If you need warranty service, please contact us at
[email protected] directly and provide us your order ID.
If you still have questions on sunkko products, please go to the blog category
on https://www.sunkko.net/ or email [e-mail]. We are happy to
assist you.