Hey folks, great you're watching again!
Many of you asked me questions
about how a welder works
As you've seen my welder
Overthere
has broken down not long ago
I've checked it
It turned out that the transformer
which powers the electronics, broke down
It has to do with the weather becoming colder and more humid
so you get condensation
That's not good for such a transformer
especially if it's an older one
Electric welding, how does it work?
To explain that, I have this little test
Don't try at home;
Batteries in short circuit.. Don't do that
They can explode
Two batteries, 12 volts each
+ of one to the - of the other
Then you may count them together
Then I will get 24 volts here
This one goes here
and this one goes there
Overhere I have 24 volts
Do not connect to your ears
Hahaa, silly joke
Nobody is laughing, but that's fine
Overhere I have a so-called workpiece
Metal strip
Connect it
Now I have a thin metal wire
By accident it's a piece of welding wire
But it's just an ordinary metal wire, nothing special
I connect that one overhere
Skillfull welding!
But this is pretty strong connected, look
Now this is a terrific piece of work
This is the base principle for electric welding
In fact you have a short circuit
A current is flowing through the air
We call that an arc
That generates so much heat, the metal will melt
and then you just melt the metal together
and you get a firm bond
So simple
Let's look at the real deal
because there's more
The transformer has been installed
Let's see what happens
I don't see any smoke yet.. so
I think it's fixed!
Install the bottle of gas and let's see if it works
Good!
Here it is; the welder
MIG/MAG welder
That means;
Metal Inert Gas
or;
Metal Active Gas
That 'gas' refers to the gas
I will get back on that later
Let's focus on the device itself
If we look inside
You see these big fat coils
Those are transformers
We don't have any batteries in there, but transformers
What do they do?
They transform the incoming voltage
From 400 volts
to.. I believe somewhere around 48 volts
But with a higher current
So when I'm welding a current is flowing
Through these transformers
that goes to the workpiece
That's where the arc is generated
Sparks, heat, melting
everything bonded
A lot of cables are attached to a welder
This cable is the power supply, coming from the wall socket
A ground cable
Exactly the same as with the batteries
That one goes to the workpiece
And then we have the torch
And that's the part you control while welding
If these touch when you push the button;
that's when you get that short circuit
On the other side we have another important part
Come
Here's the filler material, it's just a metal wire
Overhere is an electric motor
Which feeds that wire through the hose to the torch; look
If you're welding the wire keeps melting off
and that stays on the workpiece
Well; let's see if it works again
What an ugly roast
this is not such a nice bead
It has been fizzing
That's because molten steel reacts with oxygen
Which is present in the air
To get rid of that oxygen we use a shielding gas
Look;
On the back of the welder we have this bottle
It contains a mixture of gasses
There are several options for that gas
This is Argon - Co2
If I start welding, this gas is flowing from the torch
And it will push the oxygen away
And it forms a shield around the molten steel, so it won't react with oxygen
I will open it
Now it will perform much better
You hear it?
Gas is flowing
Let's see what happens
That's much better
The top ones are without gas
And the bottom one is with gas
Do you see the smooth surface of this one?
Excellent
There are a lot of switches on a welder
These are the important ones
You can control the current with those
For thin welding you use a low current
and for more heavy welding
big pieces of metal
You use a higher current
If the current is higher
You get more heat
a bigger burn in depth
and a better weld
If you use a high current for thin sheet metal
then it will totally melt away
and then you only have a large hole and no weld
On top here;
It seems the ink is not waterproof..
I guess this thing is not for outdoor use
But there's not much of a choice, it's like that
That knob controls the wire feed
You've seen that reel with metal wire and the e-motor
With this one you can adjust the speed
You understand that if you're doing some heavy welding
with a lot of heat
you need to feed more wire, because it will melt quicker
That controls the speed
That's it!
Enough small talk about this welder
I reinstall the covers
and start welding on that RollGolf if that's okay for you
Otherwise it won't roll this year I'm afraid
Thank you for watching and see you next time!
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