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Author: Subject:  Cut out or fill?
Membersmcleod
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posted on May 26th, 2008 at 12:13 PM
Cut out or fill?


Hi Everyone,

I've sanded back the rust on a couple of spots on the rear apron and just wanted some advice. Should I cut out the holy spots and weld some new metal in, or should I just fill it up with Bondo? Pictures below:

http://i226.photobucket.com/albums/dd54/Amiga0ne/IMG_0213.jpg

http://i226.photobucket.com/albums/dd54/Amiga0ne/IMG_0202.jpg

http://i226.photobucket.com/albums/dd54/Amiga0ne/IMG_0205.jpg

http://i226.photobucket.com/albums/dd54/Amiga0ne/IMG_0212.jpg

http://i226.photobucket.com/albums/dd54/Amiga0ne/IMG_0203.jpg

http://i226.photobucket.com/albums/dd54/Amiga0ne/IMG_0204.jpg
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posted on May 26th, 2008 at 05:29 PM



Rust doesnt get better with age......cut it out



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posted on May 26th, 2008 at 09:16 PM



As above



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posted on May 26th, 2008 at 09:41 PM



would you keep a cancer in your body:?:

cut it out:tu:




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posted on May 26th, 2008 at 10:22 PM



There is no question about it. There is only one way to do it. Cut out all sections with holes, and go further until all metal inside is clean, and weld new sections of sheetmetal to that. If you can get some old damaged panels to cut the sheet from, that is a good way to go as you can cut bits with shapes if you need to. Get panels of similar age and thickness. A crunched 2007 Honda panel would not be a good choice for example.



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posted on June 10th, 2008 at 08:23 PM



These shots now show the rust cut out:


http://i226.photobucket.com/albums/dd54/Amiga0ne/IMG_0217.jpg


http://i226.photobucket.com/albums/dd54/Amiga0ne/IMG_0218.jpg

I'd like to hear suggestions on the best way to patch these areas up now.

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posted on June 10th, 2008 at 08:44 PM



Now you need to get sections of panel steel, from an old damaged VW, Holden, Ford, Valiant panel for example, and shape it and weld it in using a MIG welder, or even an Oxy welder and fusion weld it. Then grind it back, and go from there. A search through threads in this section of the forum, and a search of "MIG welding", "Rust repairs" or "Oxy welding" will give you hours of information to read.



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posted on June 10th, 2008 at 09:40 PM



Quote:

shape it and weld it in using a MIG welder,



I've got my MIG all ready to go.....I just want to practise a bit more before I actually start on the car. Would it be best to weld the new metal in as one single piece or a couple of pieces to form the shape?

I really appreciate your replies by the way Hellbus. It's a real comfort to know there's help out there.

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posted on June 10th, 2008 at 10:21 PM



It is best to do it in one piece. If you are going to have any troubles or future rust, it will be where you weld, so it is always better to keep joins to a minimum.

Sometimes on an old panel you can find bits to cut out that are already the right shape or fold.




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posted on June 10th, 2008 at 10:22 PM



Oh and the time spent getting the new piece to fit with no gaps in the join before welding will make your welding job a lot easier. Best to spend an extra half an hour trimming it exact, than spending an extra hour welding big gaps and grinding.



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posted on June 11th, 2008 at 08:38 PM



Quote:

Oh and the time spent getting the new piece to fit with no gaps in the join before welding will make your welding job a lot easier.



Excellent advice. I'll certainly be taking my time in doing this as I've noticed that I'm more likely to blow holes when there are gaps.
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posted on September 6th, 2008 at 05:20 PM



Ok, well've spot welded in the patch panel but I just want to know what the best way to proceed is.

Do I keep welding around the whole perimeter and risk warping the metal and possibly burning holes?(I did this already, hence my 2nd attempt at the patch panel). Or do I just go with the body filler and seal it up that way?

http://i226.photobucket.com/albums/dd54/Amiga0ne/IMG_0273.jpg
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posted on November 24th, 2008 at 12:26 PM



Weld it up a bit at a time. Do a couple of cm's then let it cool. Then do some more. Also as you do this, dont stop on the tack weld. Using a wet rag also helps. Just dont rush it or things turn to crap pretty quick.

You could manage the heat by welding a bit on one spot, then weld another bit where the steel is still cool. Ie the top left, then the bottom right. But you still need to let things cool regardless.




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