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Hey, Folks! I'm going to do a setup.
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All five joint types:
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butt, edge,
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lap, corner, T joint.
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I've got my
stacked 1/8 inch mild steel cold roll--
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I believe this is hot rolled material.
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Preferably would be cold roll,
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I get a little bit more flaking
of the oxides mill scale
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when I weld on this,
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but that's what I got, so here we go.
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First things first
is get your machine set up properly.
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I've got, uh, DC electrode negative.
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I'm using the GTAW process.
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I've got a CK worldwide slider
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with a on-off switch.
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I've got 3/32" tungsten
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with a number 12 nozzle.
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My CF is 25 cubic feet of argon.
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Again, machine set at about 130 amps.
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The five joint types
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is something that we want
to all be very, very familiar with
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and...
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Fully aware of how
to tack them together efficiently.
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I don't have full welds on these joints.
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I've got tacks.
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The tacks should be small enough
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to hold the parts together,
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but large enough...
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other way around.
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*Small* enough that when I incorporate them into the weld, you can't tell,
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but large enough
that they hold the parts together.
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One of the nice features of the switch
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is I can turn the torch on and off,
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leave my feet alone.
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And I can turn it on
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to the desired amperage
very, very quickly
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without having to floor the pedal
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and wait for a ramp up time.
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It's a great feature.
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First one I'm going to do
is that square groove.
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One of the things I want to do
when I position my parts
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is look for that sharp edge
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pointed towards each other,
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so each one of these sharp edges
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pointing towards each other.
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On the square groove, I'm going
to have a very, very slight gap.
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The gap I'm looking for,
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rule of thumb,
right around material thickness.
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I'm going
to go slightly smaller than that...
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Like so.
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Position my torch next to my work.
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Just touch it so I know where it's at,
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and then back off of my joint.
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Place my filler material in the gap.
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Watch your eyes.
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And that quickly,
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we can
achieve a really nice little tack.
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Now the part is not complete.
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Obviously you need to roll it around
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and get a consistent gap,
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all the way down my part.
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And put my second tack on there.
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Start my shielding gas, purge my area,
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and three, two, one.
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Tack that part together.
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So my square groove is done.
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Pretty good alignment.
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Another good way
to check your alignment,
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just grab another piece
of sheared material
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and set it down
and check your alignment.
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You don't want mismatch,
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from one side to the other.
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Okay, so there's your square groove.
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Next is my edge.
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Again, put my sharp edges
towards each other.
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On the edge joint, at least
this particular joint configuration,
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I'm going to be
tacking each of the corners.
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Purge my environment.
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Purge my area
with some shielding gas flow.
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Eyes.
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And all for tacks there.
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My edge joint is done.
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Okay.
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Next is going to be my lap.
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You've got your replay on the screen.
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You can see I rotated that part,
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positioned it,
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pushed down on the trigger.
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Next is my lap joint.
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I don't need the filler material
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on these next several joints,
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but I do need to have good fit up.
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again looking for that sharp edge
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towards the other part.
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Okay, get your tungsten
right down to the joint
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until it touches-- eyes.
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Looking for that shine in the puddle.
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As soon as I see the shine,
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telling me
that both parts are connected,
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then my tack is complete.
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I can almost see the two parts
pull apart from each other.
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That's why you got
to have enough amperage
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to break that surface tension,
make sure your part is complete.
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On the lap joint, I'm going
to put an itsy bitsy little tack
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right in the middle of the joint.
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Eyes.
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That lap joint is then complete.
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Next is my corner joint.
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Grab my two parts again,
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make sure my sharp edges
are facing each other.
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Corner to corner.
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Just like so-- eyes.
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Again, touch the tungsten
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right where I want it,
and then back off.
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I can physically feel those limits.
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Eyes.
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The best way to get a good tack:
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again, I didn't spend a lot of time
on that tack.
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Just enough to hold the parts together.
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Reposition those parts
to get the other side.
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Okay, eyes.
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I'm going to put another tack
right in the middle
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of this corner joint
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and set the nozzle down
right on the joint edges.
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Touch the tungsten
right down into the heart
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and, eyes.
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Lift off and...
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go.
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Okay, got that corner joint complete.
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Last one is my T joints,
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and make sure my sharp edge,
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and the face of the--
the bead I'm going to be--
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facing the part
that I'm going to be joining.
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Has a good fit up.
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Eyes.
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Okay, I'm going to
put a small little tack
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in the center of this one as well.
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Just touch my joint.
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Back off and squeeze the trigger.
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Nice.
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Looking for that shine.
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Looking for the shine.
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Reading the puddle, I know it's joined.
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Okay, there we have it.
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Got our butt edge,
lap, corner and T joint.
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Good luck, have fun.