Return-Path: Received: from mtiwmhc13.worldnet.att.net ([204.127.131.117] verified) by logan.com (CommuniGate Pro SMTP 4.1.5) with ESMTP id 2625439 for flyrotary@lancaironline.net; Sun, 05 Oct 2003 23:28:37 -0400 Received: from unknown (152.birmingham-01-02rs.al.dial-access.att.net[12.86.88.152]) by mtiwmhc13.worldnet.att.net (mtiwmhc13) with SMTP id <20031006032833113007nc6ne>; Mon, 6 Oct 2003 03:28:34 +0000 Message-ID: <003f01c38bb9$be404700$9858560c@unknown> From: "Michael D. Callahan" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: I welded!!! Date: Sun, 5 Oct 2003 22:27:14 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003C_01C38B8F.D412EC60" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_003C_01C38B8F.D412EC60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 ------=_NextPart_000_003C_01C38B8F.D412EC60 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
    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.
    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.
    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.
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Sunday, October 05, 2003 = 8:32=20 PM
Subject: [FlyRotary] Re: I=20 welded!!!

SPF sunblock 45 lotion will save your = skin on=20 those hot days when a long sleeved shirt is out of the=20 question.  
 
That's good=20 to know.  I've joked about welding being a winter sport here in=20 Florida :-)
 
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?  
 
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.  
 
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.
 
A 400 degree preheat will help on = large pieces or=20 if you're down on amperage.  
 
Thanks for=20 the tip.
 
Rusty
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