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Fit Up and Tack Welding Five Joints GTAW 20200404

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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.
Title:
Fit Up and Tack Welding Five Joints GTAW 20200404
Description:

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Video Language:
English
Duration:
08:41

English subtitles

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