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diy-spotwelder-part-2-e578bc-en.md

WARNING! This project doesn't work. To know why, please go to part 3 (https://create.arduino.cc/projecthub/Westpol/diy-spot-welder-part-3-700923)

My Upgraded Design

I've thought about the first design of my spotwelder (https://create.arduino.cc/projecthub/Westpol/diy-cd-spot-welder-part-1-b60f05) and changed everything. The power supply is now a 5200mAh Li-Po battery with a discharge rate of 45c, the Mosfets are 20 130W ones and beside frome the pulse time, there is also the energy shown in joule. I also put two caps at the 5V pin of the Arduino to power the chip, because if you short the battery contacts the voltage of the battery will drop to almost nothing. In part 3, I will also clean up the sketch and with the help of a voltage divider to measure the voltage of the battery and some maths, the energy will be more accurate.

ToRebuildTheProjectByYourself

When you want to rebuild this project by yourself, you should be familiar with the basics of electronics, because if you do something wrong, it can kill your battery or the other components used in this project. Also the system isn't tested yet, so if you are not sure that it will work, wait until I upload part 3 where I'll test it.

TheSafety

The whole design isn't really save. I don't have any fuse installed and the high power traces are close to each other, so you should have an eye on it while working.

EXPANDED TECHNICAL DETAILS

High-Power Timing Control

Part 2 of this industrial DIY project focuses on the precision timing required to safely weld battery tabs.

  • Millisecond Pulse Management: The Arduino controls a high-current Solid State Relay (SSR). The firmware allows the user to set the "Weld Time" in 1ms increments (typically 10ms - 50ms) using a rotary encoder.
  • Safety Interlock Hub: Features a "Double-Trigger" logic; the weld only occurs if the foot-pedal is pressed AND the internal thermal sensors report a safe temperature, preventing accidental firing or transformer overheating.

Visual Interface

  • TFT Status Display: Shows the current weld-pulse setting and the transformer's temperature on a sharp 1.3" Color OLED or LCD.

ข้อมูล Frontmatter ดั้งเดิม 

title: "DIY Spotwelder - Part 2"
description: "I want to make a spot welder for battery packs or other stuff that cannot be soldered."
author: "Westpol"
category: "Lab Stuff"
tags:
  - "spot"
  - "spotwelding"
  - "diy"
  - "welding"
views: 6008
likes: 7
price: 2450
difficulty: "Intermediate"
components:
  - "1x Soldering iron (generic)"
  - "1x RGB Backlight LCD - 16x2"
  - "1x Arduino Micro"
tools: []
apps:
  - "1x Arduino IDE"
downloadableFiles:
  - "https://projects.arduinocontent.cc/824dfbf6-e086-4da5-bdd8-9c7c943e5e57.ino"
  - "https://projects.arduinocontent.cc/824dfbf6-e086-4da5-bdd8-9c7c943e5e57.ino"
  - "https://projects.arduinocontent.cc/82fca163-c9b9-4457-8573-414bf2e92862.ino"
documentationLinks: []
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seoDescription: "Build your own DIY Spotwelder Part 2 for Battery packs and materials that cannot be soldered."
videoLinks: []
heroImage: "https://cdn.jsdelivr.net/gh/bigboxthailand/arduino-assets@main/images/projects/diy-spotwelder-part-2-e578bc_cover.jpg"
lang: "en"