DIY Spot Welding machine for battery packs

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Revision as of 21:55, 4 May 2026 by Mol (talk | contribs) (→‎Kits)

Introduction

NE555

Transformer


Theory: NE555 based

Idea

The 555 timer circuit controls MOSFETs that deliver short, high-current pulses for welding nickel strips. The 555 shall work in monostable mode.

The MOSFETs (IRLB4132 or IRF3205) handle the high welding current.


Kits

99 Gears 12V Spot Welder Kit

  • Problem: Blowing up.
    • Not enough amperes from the battery. If not enough current for the mosfets, those will blow.
    • Nickel thickness of 0.1 - 0.2 mm: 120 - 180 Amps.
  • Problem: Welding takes a lot of practice.
    • Resistance is the key. Push just hard enough to get a contact, and not with perpendicular probes.

References

Some references related to 555 based

https://hackaday.io/project/204777-diy-battery-spot-welder-build-your-own-power-pack/details

https://www.instructables.com/DIY-Battery-Spot-Welder-Build-Your-Own-Power-Pack-/

pcbway.com/project/shareproject/

Theory: Transformer based

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