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Matt Hancuh
Joined: 15 Apr 2007
Posts: 3
Location: Northfield, Minnesota
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 Posted: Fri Apr 27, 2007 4:58 pm Post subject: Rust in the scratches on Rudder and Wing attach point |
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On an old Ultrastar.
My first instinct is to sand them down to metal and paint them with some rustoleum or outdoor enamel.
Should I even be concerned about these shallow scratches? Is there a better thing to do?
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planecrazzzy
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| Posted: Sun Apr 29, 2007 5:12 am Post subject: Re: Rust in the scratches on Rudder and Wing attach point |
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It wouldn't hurt to "touch-up" the paint.....an epoxy would probly hold up the best without having to put it on too thick....
However , What I saw in your picture of your rudder.....
Tailwheel steering control arm has a "Cold Lap" weld....
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See the "Line" of rust at the bottom of the weld.....With out a pre heat, Short welds don't have the time to heat up the metals properly....
UNLESS you have the welder turned up for short welds......( which would be too hot for longer passes..... ( also, mill scale doesn't help things )
I spent 40 hours going over my frame....Fixing Cold Lap welds....Grinding them out and re welding....
Hey Big Lar....Didn't you get Rust running down your Powder Coating
on yer Cage from Cold Lap Welds....?
And once a weld has an opening like that....Flexing will only make it travel
further....
This part doesn't look critical....But look for the same signs in tubing that might be keepin yer butt in the Sky.....
Gotta Fly...
Mike & "Jaz" in MN
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biglar
Joined: 14 Jan 2006
Posts: 457
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| Posted: Sun Apr 29, 2007 6:19 am Post subject: Rust in the scratches on Rudder and Wing attach point |
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I don't believe the rust is from cold lap welds......more likely from a poor powder coating job. That said, the welds are fairly rough and lumpy, with quite a bit of spatter that wasn't cleaned off, so I'll take a closer look at them. I'm very aware of "cold solder" joints, but never have heard of "cold lap" welds, so it looks like ya learn something new every day. Thanks Lar.
On 4/29/07, planecrazzzy <planecrazzzy(at)yahoo.com (planecrazzzy(at)yahoo.com)> wrote: [quote]--> Kolb-List message posted by: "planecrazzzy" <planecrazzzy(at)yahoo.com (planecrazzzy(at)yahoo.com)>
It wouldn't hurt to "touch-up" the paint.....an epoxy would probly hold up the best without having to put it on too thick....
However , What I saw in your picture of your rudder.....
Tailwheel steering control arm has a "Cold Lap" weld....
.
.
.
See the "Line" of rust at the bottom of the weld.....With out a pre heat, Short welds don't have the time to heat up the metals properly....
UNLESS you have the welder turned up for short welds......( which would be too hot for longer passes..... ( also, mill scale doesn't help things )
I spent 40 hours going over my frame....Fixing Cold Lap welds....Grinding them out and re welding....
Hey Big Lar....Didn't you get Rust running down your Powder Coating
on yer Cage from Cold Lap Welds....?
And once a weld has an opening like that....Flexing will only make it travel
further....
This part doesn't look critical....But look for the same signs in tubing that might be keepin yer butt in the Sky.....
Gotta Fly...
Mike & "Jaz" in MN
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http://forums.matronics.com/viewtopic.php?p=109823#109823 [quote][b]
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_________________
Larry Bourne
Palm Springs, CA
Building Kolb Mk IIIC
"Vamoose" |
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