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Tubing repair?

 
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steve



Joined: 16 Sep 2007
Posts: 86
Location: Davenport, IA

PostPosted: Thu Oct 20, 2011 4:40 pm    Post subject: Tubing repair? Reply with quote

Ok guys, there hasn't been much activity on here lately so here goes a question for everyone. When I purchased my project the previous owner attempted to install a canopy, while he did a decent job, it was far from a perfect fit, complicated and above all very heavy. After several years of trying and fitting I got drastic tonight and cut everything off an am going to make it an open cockpit like designed. I probably eliminated 25 to 30 pounds considering everything. Here's my question: While cutting off the old tubing and grinding down the welds, I slightly nicked the top longeron with the grinding wheel. Nothing drastic about 3/8 of an inch long and very minor scratch probably only 1/1000's deep, but nevertheless a nick in the longeron. What do I do about it? Do I dress it out like a nick on a prop, do I weld over it, do I need to cut some type of patch and weld over it? I'll take any advice.
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Bob E.



Joined: 31 Oct 2007
Posts: 147
Location: Central ND

PostPosted: Thu Oct 20, 2011 5:29 pm    Post subject: Reply with quote

If it is very minor I bet it is not worth worrying about. Carefully dress it out with a scotch brite wheel on you die grinder. If you are concerned refer to AC 43 weld repair section, treat it like a slight dent and weld a patch over the top of it.
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jsh



Joined: 19 Dec 2005
Posts: 354
Location: Burnet, TX

PostPosted: Thu Oct 20, 2011 5:35 pm    Post subject: Reply with quote

I can't tell you what is the best and/or correct thing to do. I can only say what I would do. Weld it closed. Dress that weld down very carefully with a file.....I would put masking tape on either side of the weld to know when I was getting close to the tube and avoid more scratches. Then I would polish the whole thing out with finer grades of emory cloth until there was no scratch(es) visible with a 10x magnifying glass. That is the standard that is recommended for the edges of fittings and to which I took all of mine.
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jsh



Joined: 19 Dec 2005
Posts: 354
Location: Burnet, TX

PostPosted: Thu Oct 20, 2011 5:37 pm    Post subject: Reply with quote

just having read Bob's reply, I would agree if it is that shallow. hard to tell without actually seeing it.
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