X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao02.cox.net ([68.230.241.37] verified) by logan.com (CommuniGate Pro SMTP 5.1c.5) with ESMTP id 1453596 for flyrotary@lancaironline.net; Tue, 10 Oct 2006 10:42:08 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.37; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao02.cox.net (InterMail vM.6.01.06.01 201-2131-130-101-20060113) with ESMTP id <20061010144146.MFPZ12581.fed1rmmtao02.cox.net@fed1rmimpo02.cox.net> for ; Tue, 10 Oct 2006 10:41:46 -0400 Received: from BigAl ([72.192.132.90]) by fed1rmimpo02.cox.net with bizsmtp id Yehp1V0011xAn3c0000000 Tue, 10 Oct 2006 10:41:49 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Exhaust Update Date: Tue, 10 Oct 2006 07:41:49 -0700 Message-ID: <000001c6ec7a$37fc6190$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C6EC3F.8B9FFA90" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2962 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C6EC3F.8B9FFA90 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =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 that 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 thermal stress, vibration, whatever; it is better to have a snug fit of = tube through the flange and weld on the inside. This reduces the stress on = the weld and can increase the reliability of the weld. The key in either = case is the quality of the weld and the heat treatment after the weld. =20 At least that's what I recall from my days as a practicing engineer. = Mine are welded on both sides. I'd prefer they were welded inside only. =20 Al ------=_NextPart_000_0001_01C6EC3F.8B9FFA90 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

 

>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 that 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

It depends on the = configuration.  Generally, if are side loads due to thermal stress, vibration, whatever; = it is better to have a snug fit of tube through the flange and weld on the inside.  This reduces the stress on the weld and can increase the reliability of the weld.  The key in either case is the quality of = the weld and the heat treatment after the weld.

 

At least that’s what I = recall from my days as a practicing engineer.  Mine are welded on both = sides.  I’d prefer they were welded inside only.

 

Al

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