HOW TO – Car battery-powered MIG welder

Becky Stern

Becky Stern (sternlab.org is a DIY guru and director of wearable electronics at Adafruit. She publishes a new project video every week and hosts a live show on YouTube. Formerly Becky was Senior Video Producer for MAKE. Becky lives in Brooklyn, NY and belongs to art groups Free Art & Technology (“release early, often, and with rap music”) and Madagascar Institute (“fear is never boring”).

50 Articles

By Becky Stern

Becky Stern (sternlab.org is a DIY guru and director of wearable electronics at Adafruit. She publishes a new project video every week and hosts a live show on YouTube. Formerly Becky was Senior Video Producer for MAKE. Becky lives in Brooklyn, NY and belongs to art groups Free Art & Technology (“release early, often, and with rap music”) and Madagascar Institute (“fear is never boring”).

50 Articles

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Normally MIG welding requires a big fancy machine, sometimes also with a large tank of pressurized gas. Instructables user TimAnderson managed to hack together a hand-held wirefeed MIG welding gun and a couple car batteries for a more portable effect. He writes:

Here’s my new wire-feed (MIG) welder.
All of it.
They sell these things as accessories for commercial MIG units, but they can also work great on 24 volts from two car batteries.
I have it loaded with .030″ flux-core welding wire.
It cost me less than $100 on ebay.
The “Ready Welder” is a similar commercial product.
WARNING: The tip is electrically on all the time!