- Welcome to Weld.com, I'm Bob Moffatt.
We're gonna do a quick video today, this been done before,
but we wanna show you some extreme footage here,
we're gonna put the camera guy to the test.
We're gonna do four different grinds of tungsten.
We wanna look at the arc envelope, the arc start,
we wanna get some real close footage of this.
So we've got a 15 degree grind angle, really sharp point.
We've got a 30 degree grind angle,
which is what I use a lot of.
There is a 30 degree angle with a blunt on,
which I use a lot of on aluminum.
And then there's a 60 degree angle,
which just like barely has any point to it at all,
and believe it or not,
you may think that this 15 degree grind angle super sharp
is the one with the best penetration,
versus the one that's kinda stubby here, the 60 degree.
Be amazed, I mean, it might be just the opposite
of what you think, so we wanna show you
this in some critical footage here.
I'm gonna do this on clean 3/8 plate here.
We're running 3/32" e3 tungsten, 100 amps,
we're gonna be grinding today on a handheld unit
offered by Praxair, very nice little unit.
This should be quick, simple, but we really wanna show you
the differences of these grind angles here, be right back.
Okay, I'm not gonna be holding anything,
I've got a fixture up here,
I've got a standoff, so I'm gonna set these,
we're using 3/32" tungsten, 100 amps, pure argon,
20 cubic feet per hour, I've got this gauged off
of this so all of them will be the same.
About a five second arc shot or so, just so we can
look at the envelope and see what this grind does.
This next one's gonna be 30 degree without a blunt.
This is what I use predominantly,
kinda depends on the application, joint configuration,
but I'll use this grind a lot, kinda my standard grind.
This next one's gonna be 30 degree
grind with a blunt on the end.
Our last grind that we wanna display here is a 60 degree.
I don't use this very often, but I will use it
on certain joint configurations, especially in piping.
Okay, the first one we fired up over here was the 15 degree,
the one that's, ah, god dang, that's sharp.
The 15 degree one, super sharp end,
and you saw what kind of envelope, what kind
of arc that it created, and where would we use that,
what's typical application for that?
Personally I would use it in something
like an outside corner joint
where I want more of a wider envelope,
not so sharp of an arc.
I'd use it in outside corner joints,
lap welds, and stuff like that.
Lower amperages is where I tend to use them.
The next one we wanna talk about,
the next one we fired, was the 30 degree bevel,
and that's the one that I use a lot of
all the time in just about,
I wanna say, about 80%, 90%, of my welding,
'cause I'm just used to sharpening them that way
and it works well in a lot of different applications.
Root passes, some fillet welds
and stuff like that, I've used it.
I don't really go back and resharpen, sometimes I will,
but I'll take a 30 and change it to some of these others.
So you know, again, I use this a lot,
in a lot of the applications that I do
for general purpose work.
And then we get to these other two grinds that we fired.
There's a 30 degree with a blunt.
I use this a lot on high amperage stuff,
because I don't want the tungsten to spit,
if I'm up on the high end of the current carrying capacity
of 3/32" or even an 1/8 inch for that matter,
if I'm up on the high end, I don't want this tungsten end
to deteriorate and spit, 'cause it'll spit
and it'll go right in the weld, we don't want that.
So I use these blunts, and I also
use this blunt on alternating current, as well.
I realized that everything that we did here
was DC, high frequency start to show you
some good camera footage and everything,
but I use this one here on AC aluminum
on an inverter, I'll blunt that end.
And then the last one that we used,
or the last one we fired and demonstrated,
was this 60 degree, and that little rascal there
kinda looks funny 'cause it's hardly,
looks like it hardly has a taper to it at all.
I'll use this guy here in deep fillet welds,
or in situations where it's deep groove in piping and stuff
and I do wanna get some sidewall penetration
or something, I'll use this guy a lot.
So again, to recap, 15 degree super sharp point,
30 degree, 30 degree with a blunt, and 60 degree.
Play around with them and kinda look at the footage
and see what you're gonna get as far as this arc envelope,
and then play around with them yourself.
We wanna come back and show some extreme footage,
good tight arc shots, which I know the camera guy
is highly capable of doing, he's the camera gangster,
and we wanna show some applications and cut and etch,
we wanna do that in another video sometime,
and kinda look at depth of fusion,
look at that grain structure,
maybe do it on several different types of materials.
So, hope you found this educational,
please subscribe to our channel and check us out
on Facebook and Instagram, and thanks for watching Weld.com.
You playing? You know your carbon fiber
railrods over there are flexing.
You gonna have somebody weld something up for you
that doesn't move around like that?
(laughs) You don't even have the camera on, what a (beep).