A simple and cheap spot welder
Spot welders are used in almost all plants where it is necessary to join sheets. The advantage of welding machines is the precision of joining (with very good electrical contact), and a very low voltage between the electrodes, which makes the device safe. The presented device is of course not a professional welding machine, but an amateur device to be made in one afternoon, allowing for easy welding of metal.
A transformer from a microwave oven with a wound secondary winding was used for the construction. The high-voltage winding was carefully removed with an angle grinder, taking care not to damage the core and the mains winding
Then, 2-3 turns of a copper wire 4AWG with a cross-section of 21mm ^ 2 were wound in the vacated place. Remember to properly protect the sharp edges of the core so that they do not damage the insulation on the wires.
A simple wooden stand and appropriate electrodes remained to be made
When using the welding machine, care should be taken due to the high temperature in the place of welding. Do not overheat the transformer and cables!
Source: http://hackaday.com/2009/06/23/how-to-build-your-own-spot-welder
megabit wrote 336 posts with
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Add a commentBrilliant in its simplicity. What are the electrodes made of? I would add a spring that would not allow the electrodes to be short-circuited accidentally, and a switch that turns the device on only when... [Read more]
I think that the switch is only for the foot because it is better if the current starts flowing only after the electrodes are firmly pressed. Interesting construction. [Read more]
Coolant is pumped through the electrodes in commercial equipment. [Read more]
Could someone write how many turns are needed on the primary? [Read more]
It all depends on how big your core is. Calculate the number of turns per volt by the formula. Patterns are easily available on the Internet. [Read more]
As for the transformer, it makes more sense to ask what the minimum power must have to weld metal sheets with a thickness of, for example, 1mm. [Read more]
:arrow: microscope ? of the electrode working part = 5 mm, pressing force = 1kN, welding current = 3 kA, welding current flow time = 0.4 s. Successful attempts! [Read more]
Very interesting and brilliant in its simplicity design. in my free time, do something similar because I have to mount a hinge to a metal cabinet :) are the electrodes maybe from some plug ?? How much... [Read more]
In this machine, the electrodes are from MIG. [Read more]
The same solution (trafo) is used in a transformer soldering iron. I wonder if such a luck can be adapted for this purpose. [Read more]
In the soldering iron, the transformer has a power of approx. 100VA. The one from the microwave, I think, about 800VA. I also wonder what the smallest transformer power would be enough to make a welding... [Read more]
What is the strength of such a connection, what loads can it withstand? [Read more]
I have a similar device, but from a Rubin transformer (yes TV from behind the eastern border) 300W. It even works well, but the welding takes about 4 seconds, which is quite a long time ... so 300W is... [Read more]
The primary winding of this transformer is probably not connected to 230V? [Read more]
Rather, it is definitely 230V. Why should it be any different? [Read more]
I don't want to look for scripts, but the entire production of cars is based on spot welds. Of course, we are talking about the production of the car body. [Read more]
The photos of the transformer show a rather thick flat bar on the primary winding :?: [Read more]
The visible winding is made of round wire. If you are serious about such a welder, the transformer used must have a central column cross-section above 15cm?. Below this cross-section, at most a toy will... [Read more]
Aa, that is, such a transformer from a welding machine will be suitable? :) [Read more]