X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-d20.mx.aol.com ([205.188.139.136] verified) by logan.com (CommuniGate Pro SMTP 5.1c.5) with ESMTP id 1456956 for flyrotary@lancaironline.net; Wed, 11 Oct 2006 20:04:07 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.139.136; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-d20.mx.aol.com (mail_out_v38_r7.6.) id q.c28.391c7c6 (60475) for ; Wed, 11 Oct 2006 20:03:38 -0400 (EDT) Received: from FWM-R09 (fwm-r09.webmail.aol.com [152.163.211.137]) by ciaaol-m03.mx.aol.com (v113.6) with ESMTP id MAILCIAAOLM034-ec3b452d865a15a; Wed, 11 Oct 2006 20:03:38 -0400 References: To: flyrotary@lancaironline.net Subject: Re: [FlyRotary] Re: Exhaust Update Date: Wed, 11 Oct 2006 20:03:38 -0400 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: wrjjrs@aol.com X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MailBlocks_8C8BBA900EAF916_13BC_301B_FWM-R09.sysops.aol.com" X-Mailer: AOL WebMail 20458 Received: from 65.161.241.3 by FWM-R09.sysops.aol.com (152.163.211.137) with HTTP (WebMailUI); Wed, 11 Oct 2006 20:03:38 -0400 Message-Id: <8C8BBA900F22030-13BC-18EE@FWM-R09.sysops.aol.com> X-AOL-IP: 152.163.211.137 X-Spam-Flag: NO ----------MailBlocks_8C8BBA900EAF916_13BC_301B_FWM-R09.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" George,=20 The old joke in the US of A was, How do you get to Carnagie Hall? Answer: P= ractice! Since this is my job I'm at the silly thing all the time. BTW the t= acks on the outside are rather overlarge just so people could see them. If y= ou have a fairly good fit on the pipe you don't need them at all. FWIW. Bill=20 =20 =20 -----Original Message----- From: lendich@optusnet.com.au To: flyrotary@lancaironline.net Sent: Wed, 11 Oct 2006 3:29 PM Subject: [FlyRotary] Re: Exhaust Update Bill, Beautifully done- as usual. I wish I could do that on CAD. George ( down under) ----- Original Message -----=20 From: wrjjrs@aol.com=20 To: Rotary motors in aircraft=20 Sent: Thursday, October 12, 2006 1:04 AM Subject: [FlyRotary] Re: Exhaust Update David, The method is to put the pipe thru the flange. I've attached two jpeg= s to show examples=20 =20 Bill Jepson =20 -----Original Message----- From: dcarter11@sbcglobal.net To: flyrotary@lancaironline.net Sent: Tue, 10 Oct 2006 9:42 PM Subject: [FlyRotary] Re: Exhaust Update How does a welder weld the "inside" of an exhaust pipe joint? Seems like a=20= long reach with tip of a long welding rod and a woefully small angle for tou= ching the seam to electricaly weld it. =20 David ----- Original Message -----=20 From: Al Gietzen=20 To: Rotary motors in aircraft=20 Sent: Tuesday, October 10, 2006 8:41 AM Subject: [FlyRotary] Re: Exhaust Update =20 >Just a heads up - it looks like your new "header flange to pipe" (picture 5= ) was welded on the >outside. I think that 'acceptable practices' state tha= t there should only be a tack weld on the >outside and the actual structural= weld should be on the inside. What does everyone else say? In >any event= be sure to keep an eye on the welds. > >Ken Powell=20 It depends on the configuration. Generally, if are side loads due to therma= l stress, vibration, whatever; it is better to have a snug fit of tube throu= gh the flange and weld on the inside. This reduces the stress on the weld a= nd can increase the reliability of the weld. The key in either case is the=20= quality of the weld and the heat treatment after the weld. =20 At least that=E2=80=99s what I recall from my days as a practicing engineer.= Mine are welded on both sides. I=E2=80=99d prefer they were welded inside= only. =20 Al Check out the new AOL. Most comprehensive set of free safety and security to= ols, free access to millions of high-quality videos from across the web, fre= e AOL Mail and more. -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ ________________________________________________________________________ Check out the new AOL. Most comprehensive set of free safety and security t= ools, free access to millions of high-quality videos from across the web, fr= ee AOL Mail and more. ----------MailBlocks_8C8BBA900EAF916_13BC_301B_FWM-R09.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8"
George,
 The old joke in the US of A was, How do you get to Carnagie Hall?= Answer: Practice! Since this is my job I'm at the silly thing all= the time. BTW the tacks on the outside are rather overlarge just so people=20= could see them. If you have a fairly good fit on the pipe you don't need the= m at all. FWIW.
Bill 
 
 
-----Original Message-----
From: lendich@optusnet.com.au
To: flyrotary@lancaironline.net
Sent: Wed, 11 Oct 2006 3:29 PM
Subject: [FlyRotary] Re: Exhaust Update

Bill,
Beautifully done- as usual.
I wish I could do that on CAD.
George ( down under)
----- Original Message -----
Sent: Thursday, October 12, 2006 1:04= AM
Subject: [FlyRotary] Re: Exhaust Upda= te

David, The method is to put the pipe thru the flange. I've attache= d two jpegs to show examples 
 
Bill Jepson
 
-----Original Message-----
From: flyrotary@lancaironline.net
Sent: Tue, 10 Oct 2006 9:42 PM
Subject: [FlyRotary] Re: Exhaust Update

How does a welder weld the "inside" of an e= xhaust pipe joint?  Seems like a long reach with tip of a long welding=20= rod and a woefully small angle for touching the seam to electricaly weld it.=
 
David
----- Original Message -----
F= rom: Al Gietzen
Sent: Tuesday, October 10, 2006 8:41=20= AM
Subject: [FlyRotary] Re: Exhaust Upda= te

 
&g= t;Just a heads up - it looks like your new "header flange to p= ipe" (picture 5) was welded on the >outside.  I think that 'acceptable practic= es' state that there should only be a tack weld on the >outside and the actual structura= l weld should be on the inside.  What does everyone else say? &nbs= p; In >any e= vent be sure to keep an eye on the welds.
&g= t;
>Ken Powell=20=
It depends on the c= onfiguration.  Generally, if are side loads due to thermal stress, vibr= ation, whatever; it is better to have a snug fit of tube through the flange=20= and weld on the inside.  This reduces the stress on the weld and can in= crease the reliability of the weld.  The key in either case is the qual= ity of the weld and the heat treatment after the weld.
 = ;
At least that=E2= =80=99s what I recall from my days as a practicing engineer.  Mine are=20= welded on both sides.  I=E2=80=99d prefer they were welded inside only.=
 = ;
Al
Check ou= t the new AOL. Most comprehensive set of free safety and security to= ols, free access to millions of high-quality videos from across the web, fre= e AOL Mail and more.
--
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