Re: acute MIG joints

We are using Powerwaves (.045) so have lots of control over gas and current.
Can't go to pulse because of qualification limitations. Binzel does make
an extended diffuser to move the contact tip out and a nozzle that closes
down to about half inch.
We will be trying all kinds of things this week. I personally like a
simple wedge insert but we will see what management decides.
They are walkways for dolphin access.
Randy

"Drew McEachren" <rednex2@xxxxxxxxxxxxxxx> wrote in message
news:V%UBg.141578$A8.105364@xxxxxxxxxxx
Hi Randy:

I have come up against this same thing more than a few times doing stuff in
boats as well as dock ramps. You are using a Binzel push pull, so I wonder
if you are running it in front of a Powermig 300. If you are, what has
worked for me in the past is to set a long preflow so the joint is flooded
with argon and set your trim real low (almost ridiculously) so the wire
manages to get into the joint before arcing on the top and bottom. Also set
your arc control right to 10. Push your nozzle back as far as you can get
it ( contact tip protruding about 1/4" ). It takes a bit of practice but
once you get it, you may be surprised to see some of your best cosmetic
welds in what appears to be the most difficult place to put one.
(I am assuming that you are using .047 wire here) .035 doesn't seem to like
doing this for me for some reason.
If you are running conventional than just push tons of wire into it. Tons
of wire speed (ridiculous amounts for the voltage) to push the wire all the
way to the root of the joint.
Just out of curiosity, is this a truss for a ramp or bridge?


Drew McEachren



"R. Zimmerman" <m-zimmerman@xxxxxxx> wrote in message
news:yY1Bg.318305$iF6.182605@xxxxxxxxxxx
Has anyone made up an extension or modified gun nozzle and contact tip to
reach into sharp corners. We have a four inch long seam to do that is
created by a four inch aluminum tube set at less then thirty degrees.
We tried out supplier but no smaller nozzles available. ( Binzel push
pull
gun)
Presently the nozzle forces us to attempt a weld with a two inch
stickout.
One can imagine the quality. Squeezing the tip of the nozzle will give us
about one and three quarters stickout... Still not enough.
I am toying with adapting a spool gun contact tip to the present
threaded
tip to five me a three inch long contact tip. The next step would be a
custom nozzle???
Randy






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