Mini Transistor Spot Welding Pen DIY 18650 Battery Spotwelder Machine Portable 12V Automobile Battery Spot Welder Welding Tool             Specifications:      The controller adopts single-chip microcomputer control, the output pulse is accurate, and the welding quality is guaranteed.      With a LCD display screen, the controller can display welding parameters.      The  soldering pen and the input line are connected by U-shaped cold-pressed  terminals, which is convenient for disassembly and replacement.      The  controller adopts automatic welding mode, while retaining the manual  trigger interface, you can choose according to your own usage.      Using 2 ounces of copper, the power board increases the overcurrent capacity.      Using five 300A non-disassembled MOS tubes, they have good consistency.      The  MOS tube driver adopts imported special chip driver, and the MOS tube  can be turned on as fast as 20ns, which can switch quickly to prevent  tube explosion.      MOS drive design increases transient diode to protect MOS and prevent tube explosion.      The soldering pen wire and the input wire use 10AWG multi-wire soft cords to increase the current capacity.      This controller is mainly for welding 0.1mm to 0.15mm nickel-plated steel strip.      Adding  a 25V10000uF high frequency low resistance capacitor to the power  input, which is for energy compensation and increase welding stability.      Using Instructions:      1: Power Connection      The  controller comes with a 20cm long 10AWG input wire, one end has been  crimped with the U-shaped terminal, and the other end has not been  processed. Connect the crimped U-shaped terminal to the input end of the  control power supply, and handle the other end according to your own  power supply. Note that the positive and negative poles should not be  connected wrongly.      2: Switch Machine      There  is a power switch under the control panel. After pressing it, wait for 3  seconds, after the buzzer beeps, the LCD lights up and the boot is  completed. Press the power switch again to shut down.      3: Welding      Press the welding pen obliquely on the nickel strip to keep the welding needle clean.      According  to the actual test, if the welding needle is ground into a round head,  the welding effect can be improved. There are two welding methods,  manual and automatic.      Item Name: Spotwelder      Material: Metal      Power Supply: 18650 Battery or 12V Automobile Battery      Battery: 18650 Battery (Not Included)      Features: Portable, Durable, Welding Tools      Size: 10cm x 5cm x 2.6cm/3.94" x 1.97" x 1.02" (Approx.)