How to Make a MINI Spot Welder for Cheap / 12 V

https://www.youtube.com/watch?v=Gk3vrKc4Y1w&feature=youtu.be

Step 1: To Do a MINI Spot Welder for Cheap / 12 V You Need!!!

In today's video I'm going to show you a cool idea on how to make a simple welding device, a spot (contact) welding to be more exact.

Step 2: Step by Step!!!

It won't take lots of troubles t make a device for a spot (contact) welding.

Step 3: The Most Important Thing Is That It Can Be Made by Yourself at Home.

Step 4: Having No Equipment for Welding You Could Make a Mini Welding Device for a Spot (contact) Welding!!!

Step 5: MINI Spot Welder for Cheap / 12 V Is Ready!

Thanks for watching!!!!!

Comments

[shafique1944]

Very nice make item.

[Dan1Za]

A number of points....
-While an old car battery may be more available, a smaller, though good sized motorcycle or similar battery with ~200-300 starting amp rating will do the job just fine, take up less space, and less likely to burn things up than the car battery with ~500+ CCA.
-What gauge wire are you using from the batteries? Your 'heavy' wire does not look more than 12 guage (maybe less??) in the pics and really still not sufficient other than ready to start a fire should anything go wrong. For continuous use (worst case scenarios), should be at least 6 gauge if you don't have any other limiters in place to prevent current flowing for an extended period.
-Try NOT to be touching the metal being welded with your bare hands (like you show doing in more than one pic). Sure you'll be fine 99.99% of the time but just takes once to ruin your day (or week, etc.). Can easily hold the strip in place with insulated pliers or glove, or even a piece of tape or most anything to just hold it down for a moment that's non-conductive.
-For the people worried about damaging the battery or other disasters, sure shorting a battery isn't a great idea overall, but mostly this momentary surge, even repeated regularly, really can't be compared to any extended short where the battery might explode. (assuming nothing goes wrong, which leads me to...)
-All that being said, worst part of the design IMO is there's no interrupt. Whether a relay/switch, a timer, a slow fuse, or anything to keep the current from flowing more than a matter of milliseconds. There should be something other than good intentions to keep the worst case scenarios from happening.

[mysonosplay1]

I love this method - quick and simple and gets the job done.

No hacking of microwave transformer, no Arduino, no relays, no timers, no capacitors, no circuit boards, no ICs! and no crazy thick copper wires.

But getting that battery is still a issue, so I am thinking of a even simpler method, just run 2 wires from my mains 220V's live & neutral and give it a quick short to spot weld my battery contacts.

[DanD53]

I would suggest using a fair sized transformer 220v AC primary and 12v AC secondary - then run the 12v leads through a bridge rectifier turning it into 12v DC output, and then put a nice sized capacitor across the output leads that goes to your two copper rods you use for the welding attachment as per aforementioned design..................safer than using the method of shorting out a lead acid battery

[Andrewdon34]

Can u use it to tig weld

[HampusA]

It troubles me that this video is still up and running. Shorting a lead acid battery like this will not only cause the battery to fail in the long run, but it is also dangerous. A quote a comment from Youtube:

"Shorted battery will overheat and emit hydrogen from sulphuric acid. One little spark and hydrogen inside the case will explode!"

Dont try this! There are better, safer ways to make a spot-welder!

[hchandhok]

Hi, I really like what you've done, but should I be worried about damaging the batteries by using this method? I'll be using 26650 cells. Thanks.

[danallen82]

I'm excited about this, because I wanted to spot weld batteries too. Prior to this, I thought you needed crazy equipment to handle the task. I hope this is safe to use on NCR18650 lipo

[thesuperninja2]

Hi what other battery could you use? And nice job!

[jstork1]

I love it. Simple and effective. I can't wait to make one. My rewired MOT puts out just over 600 amps at about 1.3v. Now I can use it for more than melting nails, screws, etc. Fun stuff.