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Old 10-10-2007, 11:22 AM
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Frame rust pitting how to fix?

The frame on my '29 Dodge has some bad spots, some obviously require patching as there are holes, other spots the metal is just rough and pitted.

I'm thinking of just filling the pits with the wirefeed and grinding smooth.

Is that a bad idea? do I need to patch everything?

Or should I just fill the pits with bondo?

Keith

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Old 10-10-2007, 05:14 PM
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rust pitting

to be honest,I would at least fishplate the worst spots on the inside and fill the minor spots and grind smooth and box,box box!
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Old 10-10-2007, 05:30 PM
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Myself if it is real bad I would consider getting some box tubing and building a new chassis..Takes a lot of labor to make one of those old frames decent and unless you are going for the restore deal the new box tubing chassis will be a lot safer and a lot stronger to hold that late model engine that might go in there..

Sam
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Old 10-10-2007, 09:06 PM
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Frame rust pitting how to fix?

One more time has given you the best answer you are going to find. Your Dodge has a lot of wood in it, so the stronger tube frame would be your best bet.

Youngster
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Old 10-11-2007, 07:16 AM
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Ah, No, building a new frame would be crazy hard. This thing has more curves than Dolly Parton.

Also the frame is pretty good, there is just a few spots that need help and some pitting to deal with.
I don't have a good pic of the pitting, but here is the frame.
There is no wood in this car, btw...

And I agree, it will be fully boxed



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Old 10-11-2007, 12:14 PM
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From shat I can see from the pic that frame looks pretty good. If it was mine I would grind out the pitts and check the thickness afterwards. If all looks good either fill with weld or bondo. If it is too thin weld in replacement pieces.
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Old 10-11-2007, 03:58 PM
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Frame rust pitting how to fix?

Sorry, guess I got ahead of myself. If you are going to box the frame, then filling the pits with weld will work. One note of caution, if there are a lot of pits in one area, do the boxing first.

Youngster
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Old 10-13-2007, 09:29 AM
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I had some moderate pitting on my A rear cross member. I covered the area with braze and ground it down. I filled a couple of pits with the TIG, but brazing filled a larger area faster and cheaper.... that argon is spendy.

Structurally, pitting does detract from the intergrity. Therefore, patching and boxing should be considered in areas of higher stress.

Most older frames had enough metal in them for their mission - unlike today where CAD and FEA are used to make sure you don't get an extra ounce of metal anywhere.

Wouldn't it be nice if there were a type of Bondo that would withstand the heat of powder coating.
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Old 10-13-2007, 12:23 PM
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"Wouldn't it be nice if there were a type of Bondo that would withstand the heat of powder coating."

As far as I know, there is. A powder coating place once told me they could coat over the top of "all metal", which is basically a filler with metal in it, I guess.

I don't know if it's true or not, just an interesting thought.

Later - Karl
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