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<DIV><FONT face="MS Sans Serif"> Don't remove the material from the weld aluminum needs the strength of the weld build up to last don't go for looks go for reliability, I worked sheetmetal for 35 years and if you want or need strength leave the filler rod.it will last better if you purge and get 100% weld, and dress up like Karl does.</FONT></DIV>
<DIV><FONT face="MS Sans Serif"> Steve Maxwell</FONT></DIV>
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<DIV style="FONT: 10pt Arial">----- Original Message ----- </DIV>
<DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=JonLowe@aol.com href="mailto:JonLowe@aol.com"></A></DIV>
<DIV style="FONT: 10pt arial"><B>To: </B><A title=discussion@nsrca.org href="mailto:discussion@nsrca.org">discussion@nsrca.org</A></DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> 9/7/2005 7:39:34 PM </DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Heat treating aluminum header?</DIV>
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<DIV>After many many flights, I had an aluminum header break for my OS 1.60. I had it welded up by a very good welder, but the header broke again after one flight in an area removed from the weld, but close enough that it would have gotten pretty hot. I suspect that the heat treat of the header got changed. Any ideas on how to try to heat treat a second pipe that has benn welded to try to at least get more than one flight? I've odered a new header, but it is not here yet.</DIV>
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<DIV>Thanks</DIV>
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<DIV><FONT size=2 PTSIZE="10">Jon Lowe<BR></FONT></DIV></FONT></BLOCKQUOTE></BODY></HTML>