X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 27 Sep 2007 14:45:03 -0400 Message-ID: X-Original-Return-Path: Received: from [68.98.211.24] (HELO systems3.net) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTP id 2355109 for lml@lancaironline.net; Thu, 27 Sep 2007 10:27:40 -0400 Received-SPF: none receiver=logan.com; client-ip=68.98.211.24; envelope-from=cberland@systems3.net Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C80112.775FF2F1" X-MimeOLE: Produced By Microsoft Exchange V6.5 Subject: [LML] Cracked Engine Mounts X-Original-Date: Thu, 27 Sep 2007 07:26:59 -0700 X-Original-Message-ID: <87C33F695961494D886EB3B6C8A4765138D8ED@s3server.Systems3.local> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [LML] Cracked Engine Mounts Thread-Index: AcgArNQ6PIYXVxwLQYaSNV30+L57yQAY9XDA From: "Craig Berland" X-Original-To: "Lancair Mailing List" This is a multi-part message in MIME format. ------_=_NextPart_001_01C80112.775FF2F1 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I thought I would pass along a little information about welding 4000 series steel. I am not sure what material the Lancair engine mounts are made from but if it is a 4000 series steel then the material must be preheated before welding and then post heated for 1/2 hour after welding to prevent cracking. 4340 steel is much more prone to cracking than 4130 but they both will crack if not processed correctly. If I was going to repair a cracked engine mount, I would have it magna-fluxed after weld repair to check for cracks. Very small cracks may show up, but if they can be removed with a little de-burr, then the welds are OK. That is, they are OK, if processed correctly. Craig Berland ------_=_NextPart_001_01C80112.775FF2F1 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I = thought I would=20 pass along a little information about welding 4000 series steel.  I = am not=20 sure what material the Lancair engine mounts are made from but if it is = a 4000=20 series steel then the material must be preheated before welding and then = post=20 heated for 1/2 hour after welding to prevent cracking.  4340 steel = is much=20 more prone to cracking than 4130 but they both will crack if not = processed=20 correctly.  If I was going to repair a cracked engine mount, I = would have=20 it magna-fluxed after weld repair to check for cracks.  Very small = cracks=20 may show up, but if they can be removed with a little de-burr, then the = welds=20 are OK.  That is, they are OK, if processed correctly.
Craig = Berland
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