Aluminium spot weld

truckdoctor · 2026-02-15T17:23:48+0000

I make small model cars from sheet 1mm aluminium for the body and so far have bolted panels together but would like to spot weld. Is there any kit available that's price friendly as this is just a hobby.

minimutly · 2026-02-15T17:56:56+0000

You'll end up with a blob of ally, is my thoughts. Surface tension has the tendency for the edges of a puddle to pull together, making spotwelds difficult, in my experience.

500e · 2026-02-15T18:15:28+0000

What about Something like the battery cell welders
Like this, a lot of choices out there, presume it is very thin alloy

https://www.amazon.co.uk/AWithZ-Capacitor-Supports-Nickel-Coated-Building/dp/B0DYS5VJJ8?dib=eyJ2IjoiMSJ9.UJ0S2ec_AtTZ1P4p82o7IZuWaBfmBIux87NNymiZz2U6xi-KAOBmmJW-h2CGyIG9TSwCbChB-zzQ499zB5htc5xcOn1tNwq-bvy_43jVxWeewIkTfsJk8XnInSMV4ZPcPPnuC36p1Ynt4kKJjzbqsUkHLMit9T7lMyb48gRVRip93g63RJAvZcZLxke9Kha06_SNrck7Od4mOMOlJQ6rw5rD6unvLFtYM7HGocSOUMOckPUV-QBvH49r1QJyLV8xSWEYw1wCRJpoOCo8w4YgjvJwM7RXxuZlrr9Bsz153WI.YHH0VhoAZMtIr-3ugAN9-X4JkGNvyKj-uRnmzwxC-9M&dib_tag=se&keywords=battery%2Bspot%2Bwelder&qid=1771179251&sr=8-10&th=1

Misterg · 2026-02-15T18:29:37+0000

minimutly said:
You'll end up with a blob of ally, is my thoughts. Surface tension has the tendency for the edges of a puddle to pull together, making spotwelds difficult, in my experience.

I believe that the trick with aluminium is to sandwich it between two thin sheets of steel (maybe stainless, I don't know). Most of the heat gets generated in the steel and melts the aluminium under the spot. I've never tried it though.

I've been meaning to try it with my little microwave oven transformer spot welder. I'll see if I can find a 'round tuit' in the next couple of days.

Matchless · 2026-02-15T18:34:55+0000

I have welded aluminium with my treadle and hand held spot welders, mild steel sheet each side, usually works well, stainless may be better but always used zintec or whatever was under the guillotine! A spot welder for batteries may work,

oldbikedavey · 2026-02-15T18:39:56+0000

Misterg said:
I believe that the trick with aluminium is to sandwich it between two thin sheets of steel (maybe stainless, I don't know). Most of the heat gets generated in the steel and melts the aluminium under the spot. I've never tried it though.

I've been meaning to try it with my little microwave oven transformer spot welder. I'll see if I can find a 'round tuit' in the next couple of days.

The sandwich technique works, and I've tried it....