Return-Path: Sender: (Marvin Kaye) To: lml Date: Fri, 28 Jun 2002 01:46:10 -0400 Message-ID: X-Original-Return-Path: Received: from mailrelay.udlp.com ([207.109.1.10] verified) by logan.com (CommuniGate Pro SMTP 4.0b4) with ESMTP id 1515631 for lml@lancaironline.net; Thu, 27 Jun 2002 23:35:50 -0400 Received: from asdmngwia.mpls.udlp.com (asdmngwia.mpls.udlp.com [10.1.62.22]) by mailrelay.udlp.com (8.11.4/8.11.4) with ESMTP id g5S3Zni03606 for ; Thu, 27 Jun 2002 22:35:50 -0500 Received: from DM-MN-06-MTA by asdmngwia.mpls.udlp.com with Novell_GroupWise; Thu, 27 Jun 2002 22:35:47 -0500 X-Original-Message-Id: X-Mailer: Novell GroupWise Internet Agent 6.0.1 X-Original-Date: Thu, 27 Jun 2002 22:35:32 -0500 From: "Christopher Zavatson" X-Original-To: Subject: Hinge SS wire properties Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Content-Disposition: inline Gary, I have a lot of respect for Burt Rutan's judgement but this one has me baffled. I just finished reading the spec for stainless steel welding rods (ANSI/AWS A5.9-93) and can find nothing to cause alarm. Each filler metal designation is based on the base metal designation. For example the weld rod ER309 has the same alloying elements as regular ASTM specified 309. The prefix will distinguish between solid rod (ER) and flux core (EC). Various suffixes will designate variations from the standard alloying elements/percentages. If the AWS designation is used the rod must comply with the spec regardless of the manufacturer. I spoke to the metallurgists in our materials testing lab who specializes in welding and he was likewise curious about the reason weld wire was shunned. He could not think of any reason weld wire would cause a problem. I was not able to locate a copy of the outdated QQ-W-423 material spec used on MS20253 hinge pins. The condition appeared to be cold worked ie higher strength/less ductile than the substitutes we are discussing. I might just test an actual piece of hinge pin to check this. I'll let you know if I find out anything interesting. Chris Zavatson N91CZ >>> garyhall@ix.netcom.com 06/27/02 07:52AM >>> Subject: Hinge SS wire properties Christopher.Zavatson@udlp.com wrote: Could you please elaborate on this. What are the properties that could make the weld wire more brittle and unsuitable. . . . The drawing process can impart some brittleness, but this applies to all stainless wire unless it is anealed afterwards. Chris Zavatson Hi Chris, This discussion took place back in 1985-7. I was not part of that discussion, but was told to me by Rutan that this was a possibility and that he wanted better quality control using "know" metals. He was steadfast against using anything that might / could / possibly create a problem of *any* sort. That is why we have a certified metallurgical report with every kit. And I do believe the wire has been annealed. Hope this helps. Gary ############################################################# For archives see the LML website: http://www.lancaironline.net/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair