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From: "Michael D. Callahan" <micallahan@worldnet.att.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2625334@logan.com>
Subject: Re: [FlyRotary] Re: I welded!!!
Date: Sun, 5 Oct 2003 22:27:14 -0500
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Message If I am remembering correctly, my buddy Clark's new Miller =
TIG machine (it is probably very similar to yours Rusty) can use =
thoriated tungstens on aluminum. You also use a pencil point, which used =
to be only for steel. These new square wave machines with all the =
variables on them are much different than the old Linde TIG unit I have =
at the museum.
I have played around with Clark's TIG machine a little, just =
fiddling around with the frequency, balance, and such. I don't know what =
I am doing with it yet, but it is a pretty amazing machine. His has the =
touch-start arc starter. Man that's HANDY! No more trying to get the =
hood down, trying to hold your position, and then trying to get it =
struck without either getting out of position or touching the electrode =
and ruining the work.
If you do have to use pure tungsten on aluminum (I'll check with =
Clark tomorrow about that), you can still use the thoriated for practice =
work. Thoriated is much cheaper than pure, and it welds just as well. =
The reason you don't want to use it is that it will blow off little =
blisters of tunsten into the weld. No problem for non-critical stuff and =
practice. Mike C.
----- Original Message -----=20
From: Russell Duffy=20
To: Rotary motors in aircraft=20
Sent: Sunday, October 05, 2003 8:32 PM
Subject: [FlyRotary] Re: I welded!!!
SPF sunblock 45 lotion will save your skin on those hot days when a =
long sleeved shirt is out of the question. =20
That's good to know. I've joked about welding being a winter sport =
here in Florida :-)
For aluminum, use a pure tungsten electrode (green stripe) that is =
sized for the increased amperage needed. Use a larger diameter ceramic =
cup and increase argon flow. What machine and torch are you using? =20
So far, I've only used the red stripe, thoriated tungstens. I've got =
a good "calculator" that came from Miller, that shows the size of the =
tungsten, and cup, and also the flow rate for different thicknesses, and =
types of joints. =20
The machine is a Miller Dynasty 200DX, which is an AC/DC inverter type =
machine. The torch is an air cooled "17", which will be my amperage =
limitation.
A 400 degree preheat will help on large pieces or if you're down on =
amperage. =20
Thanks for the tip.
Rusty
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<DIV><FONT size=3D2> If I am remembering correctly, my =
buddy=20
Clark's new Miller TIG machine (it is probably very similar to yours=20
Rusty) can use thoriated tungstens on aluminum. You also use a =
pencil=20
point, which used to be only for steel. These new square wave machines =
with all=20
the variables on them are much different than the old Linde TIG unit I =
have at=20
the museum.</FONT></DIV>
<DIV><FONT size=3D2> I have played around =
with Clark's TIG=20
machine a little, just fiddling around with the frequency, balance, =
and=20
such. I don't know what I am doing with it yet, but it is a pretty =
amazing=20
machine. His has the touch-start arc starter. Man that's HANDY! No =
more=20
trying to get the hood down, trying to hold your position, and then =
trying to=20
get it struck without either getting out of position or touching the =
electrode=20
and ruining the work.</FONT></DIV>
<DIV><FONT size=3D2> If you do have to use pure =
tungsten on=20
aluminum (I'll check with Clark tomorrow about that), you can still use =
the=20
thoriated for practice work. Thoriated is much cheaper than pure, =
and it=20
welds just as well. The reason you don't want to use it is that it will=20
blow off little blisters of tunsten into the weld. No problem for=20
non-critical stuff and practice. Mike C.</FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3D13brv3@bellsouth.net =
href=3D"mailto:13brv3@bellsouth.net">Russell=20
Duffy</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dflyrotary@lancaironline.net=20
href=3D"mailto:flyrotary@lancaironline.net">Rotary motors in =
aircraft</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Sunday, October 05, 2003 =
8:32=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> [FlyRotary] Re: I=20
welded!!!</DIV>
<DIV><BR></DIV>
<DIV><FONT face=3DArial size=3D2>SPF sunblock 45 lotion will save your =
skin on=20
those hot days when a long sleeved shirt is out of the=20
question.</FONT> <SPAN class=3D109132601-06102003><FONT =
face=3DArial=20
color=3D#0000ff> </FONT></SPAN></DIV>
<DIV><SPAN class=3D109132601-06102003></SPAN> </DIV>
<DIV><SPAN class=3D109132601-06102003><FONT face=3DArial =
color=3D#0000ff>That's good=20
to know. I've joked about welding being a winter sport here in=20
Florida</FONT> <FONT face=3DArial =
color=3D#0000ff>:-)</FONT></SPAN></DIV>
<DIV><SPAN class=3D109132601-06102003><FONT face=3DArial=20
color=3D#0000ff></FONT></SPAN> </DIV>
<DIV><FONT face=3DArial size=3D2>For aluminum, use a pure tungsten =
electrode=20
(green stripe) that is sized for the increased amperage needed. Use a =
larger=20
diameter ceramic cup and increase argon flow. What machine and torch =
are you=20
using?</FONT> <SPAN class=3D109132601-06102003><FONT face=3DArial =
color=3D#0000ff> </FONT></SPAN></DIV>
<DIV><SPAN class=3D109132601-06102003></SPAN> </DIV>
<DIV><SPAN class=3D109132601-06102003><FONT face=3DArial =
color=3D#0000ff>So far,=20
I've only used the red stripe, thoriated tungstens. I've got a=20
good "calculator" that came from Miller, that shows the size of =
the=20
tungsten, and cup, and also the flow rate for different =
thicknesses,=20
and types of joints. </FONT></SPAN></DIV>
<DIV><SPAN class=3D109132601-06102003></SPAN> </DIV>
<DIV><SPAN class=3D109132601-06102003><FONT face=3DArial =
color=3D#0000ff>The machine=20
is a Miller Dynasty 200DX, which is an AC/DC inverter type =
machine. The=20
torch is an air cooled "17", which will be my amperage=20
limitation.</FONT></SPAN></DIV>
<DIV><SPAN class=3D109132601-06102003></SPAN> </DIV>
<DIV><FONT face=3DArial size=3D2>A 400 degree preheat will help on =
large pieces or=20
if you're down on amperage.</FONT> <SPAN =
class=3D109132601-06102003><FONT=20
face=3DArial color=3D#0000ff> </FONT></SPAN></DIV>
<DIV><SPAN class=3D109132601-06102003></SPAN> </DIV>
<DIV><SPAN class=3D109132601-06102003><FONT face=3DArial =
color=3D#0000ff>Thanks for=20
the tip.</FONT></SPAN></DIV>
<DIV><SPAN class=3D109132601-06102003></SPAN> </DIV>
<DIV><SPAN class=3D109132601-06102003><FONT face=3DArial=20
color=3D#0000ff>Rusty</FONT></SPAN></DIV></BLOCKQUOTE></BODY></HTML>
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