"Tom Proctor" <t_proctor@advantechinternational.com> wrote:
>I have six holes in my project roof that I need to patch. The roof is a
>circa-SII 109 with the ribbing. All the holes are drilled through the ribs.
>Four are about 3/16 inch diameter and very clean, the other two about 5/16
>inch and look like stretched 1/4 inch originals (rib also dimpled from the
>pilot on a carriage bolt). Can I fill them with some sort of brazing material
>and a torch?
I have used "Lumiweld" (one of those 'brazing' rods for non-ferrous metals)
and a propane torch with considerable success. About all I've done,
though, is to practice on beer cans, but I can 'weld' up a .50
calibre-sized hole with the stuff and not burn through the very thin metal
of the can. Small holes like those in your top should be a breeze with the
thicker Birmabright. The hole has to be very clean - no paint or
oxidation. You usually get a bronze brush with the kit. (Don't use steel
wool or a brush....)
Lumiweld (developed by NASA) and its clones/competitors melt around 700F
but harden to something like Rockwell C-55 or 60. This makes any rough
bits *very* hard to smooth out later with a file or disc.
Cheers
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