The lower right corner was in worse shape, so it needed a few extra steps to make it strong again:
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I also needed to figure out how to deal with the raised bead on the right-hand side of the door. In the end, I decided to leave it, and to try to weld it to the new patch I was about to install. Anyway, again I started with a tape template:
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That gave me a pattern for the flat section of the panel. I cut that out and burned it in. which gave me some solid steel to weld the next patch to:
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Made a much smaller tape template of the rusted area on the curved "tray" section of the door:
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Transferring that template to a scrap piece of 18 gauge steel. The tape shows the true shape of the patch, something that would otherwise be very hard to measure - especially on a curved piece like this.
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After cutting out the patch and bending it to match the curve of the door panel, I laid it in place and scribed around it, giving me accurate cut lines to follow. Because it's pretty tight working inside the raised panel, I used a cut-off wheel on my Dremel to cut out the rust.
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From there, it's just a matter of welding the patch in, and grinding it smooth. Still a little more work to do on this one, but by and large the outer door skin repair is complete. Next step is to repair the inner panel, and then reassemble the door by plug welding it back together.
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