Spot Welder from a broken microwave

Inspired by http://mad-science.wonderhowto.com/how-to/turn-microwave-oven-transformer-into-high-amperage-metal-melter-0140772/

Disclaimer, you really should not do this. Don’t try this unless you are really sure you know what your doing. Mains is dangerous, and microwaves even more so.

Work in Progress

Part 1 – Microwave Disassembly

Part 2 – Modifying the Transformer and testing the theory

Part 3 – Collecting the parts and preparing the case

Part 4 – Putting the chassis together

Part 5 – Electrodes and Wiring

Part 6  – Final wiring and assembly

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Picked up a broken microwave from freecycle
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Ok, Sticker.
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Getting the top off. There is a pretty bad smell coming from this microwave
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For something that is not meant to be user-serviceable all these components came out really easily. Here is what I was after
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A little disappointed its a small plastic transformer. I was expecting something bulkier and with a stronger metal case. But I will try it anyway
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Removed it from the board
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Removed the copper with some clippers and a screwdriver. the plastic is very brittle and breaks off easily, need to be careful
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All the second coil removed

 

Picked up some heavy duty cable from scrap at work
Picked up some heavy duty cable from scrap at work
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Gave the secondary coil a winding to have a quick test

 

Wired up a cable to a chocolate block to test
Wired up a cable to a chocolate block
It didn't really work
It didn’t really work
Another microwave
Another microwave
New Transformer, much more like what I was looking for. Also bought a circuit breaker so I don't blow the mains if it is faulty too
and out of it a new transformer, much more like what I was looking for. I also bought a circuit breaker so I don’t necessarily blow the mains if this one is faulty too

 

Part 1 – Microwave Disassembly

Part 2 – Modifying the Transformer and testing the theory

Part 3 – Collecting the parts and preparing the case

Part 4 – Putting the chassis together

Part 5 – Electrodes and Wiring

Part 6  – Final wiring and assembly

One thought on “Spot Welder from a broken microwave

  1. Kyle March 5, 2016 at 7:15 pm

    I found the exact same microwave and disassembled it. Things didn’t end well for the transformer, it doesn’t like the mains 😛

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