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Unread 05-17-2015, 11:20 AM   #1
Tfain
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1978 CJ5 
 
Join Date: Jul 2011
Location: Lutz, Florida
Posts: 619
How to go about welding frame

I'm looking for some advice on how I should go about welding my frame. As you can see the PO just put some sheet metal there and bolted it on. I want to get it fixed right. Just wondering how I should go about it. The PO obviously didn't own a welder cause he also cut out all the body rust and just riveted sheet metal in its place

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Unread 05-17-2015, 11:21 AM   #2
Tfain
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Sorry forgot to add pictures
image-3509623522.jpg

image-423570832.jpg

image-307187892.jpg

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Unread 05-17-2015, 11:42 AM   #3
shum8
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1980 CJ7 
 
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These aren't cheap, will only prolong the inevitable - they will reinforce the rear frame section enough to be safe, but the same cancer that's eating your frame will get around to these as well.

http://m.quadratec.com/products/prod...=56011+9001+07

I was going to go this route till I found a donor frame with no rust for 60 bucks. Let's just say these can be added without a total disassemble............ And I'm sure you will get a hundred ways to proceed.....

Good luck and post your results
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Unread 05-17-2015, 11:56 AM   #4
Tfain
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Quote:
Originally Posted by shum8
These aren't cheap, will only prolong the inevitable - they will reinforce the rear frame section enough to be safe, but the same cancer that's eating your frame will get around to these as well. http://m.quadratec.com/products/prod...=56011+9001+07 I was going to go this route till I found a donor frame with no rust for 60 bucks. Let's just say these can be added without a total disassemble............ And I'm sure you will get a hundred ways to proceed..... Good luck and post your results
Maybe I could weld some steal plate on the frame and just put that around it for support. I've never seen that before thanks for the info.
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Unread 05-17-2015, 02:04 PM   #5
gmakra
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Look before you leap rust does not weld it vaporizes leaving a huge hole.
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Unread 05-17-2015, 06:54 PM   #6
90lsturbo
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The front and rear frame sections can weaken over time I myself just reinforced the front frame section with the m.o.r.e frame kit this past winter due to stress and the po trying to weld it
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Unread 05-18-2015, 08:31 PM   #7
CrankyD
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There really is no cheap and easy way to do this. If you do a search on this forum and the web you find plenty of threads and pictures of various methods from mild to wild. Keep in mind the gas tank is right there also. The most common of the "correct" type of repairs is to take the tub off and strip the chassis down to the frame. Then blast/sand/grind your way to clean metal. You can then cut back past the rust, cut patches of similar gauge metal and weld them in.

At that point you can decide what to do about preserving the frame. there are plenty of opinions about that as well.

http://www.jeepforum.com/forum/f8/if...build-1016944/

Check out the linked thread post #10 shows my solution. I used scrap 2x3 mild steel cut into a U shape and welded in with a good 110 stick welder, good joint fit up and good preparation. So far so good! You don't need to be a professional welder, but you have got to understand the basics and have some practice.
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Unread 05-18-2015, 08:58 PM   #8
Tfain
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Quote:
Originally Posted by CrankyD
There really is no cheap and easy way to do this. If you do a search on this forum and the web you find plenty of threads and pictures of various methods from mild to wild. Keep in mind the gas tank is right there also. The most common of the "correct" type of repairs is to take the tub off and strip the chassis down to the frame. Then blast/sand/grind your way to clean metal. You can then cut back past the rust, cut patches of similar gauge metal and weld them in. At that point you can decide what to do about preserving the frame. there are plenty of opinions about that as well. http://www.jeepforum.com/forum/f8/if...build-1016944/ Check out the linked thread post #10 shows my solution. I used scrap 2x3 mild steel cut into a U shape and welded in with a good 110 stick welder, good joint fit up and good preparation. So far so good! You don't need to be a professional welder, but you have got to understand the basics and have some practice.
I'm pretty decent with my 110 mig that's running flux core right now. I have a 220 stick welder but I haven't really messed with it yet. Just got it hooked up yesterday. That's what I would like to use for the frame. I was already planing on removing the gas tank first. I guess if I have to I could pull the tub off. I'd rather get it right the first time and not have to mess with it again
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Unread 05-18-2015, 09:25 PM   #9
CrankyD
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The jury is still out on 110 anything getting the job done. I feel like the stick worked best for me because I could control the penetration by slowing down or speeding up and I could use nice big 7018 rods. I would do some mock ups with the same sized metal and then break them in a vice and look to see if the weld penetration is what you need. If the metal cracks through the weld its wrong, If it cracks at the base metal and the weld its wrong. If it cracks the base metal just outside of the weld area it's right and if it doesn't break and just bends it should also be good. also practice welding in the same orientation you will be on the frame IE: uphill or downhill.

You could probably get away with yanking the tank, undoing the body mounts and just jacking the tub up a bit for some room. You can do it with it on but you better be real dang handy.
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Unread 05-19-2015, 11:25 AM   #10
Partsmke
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Clean the frame with a wire wheel and determine how far the rust has gone. It can be cut out and new material welded in, after doing that "fish" plate the area. I've strapped a frame from stem to stern, to and bottom and enclosed open areas in-between on more than one old CJ. Stiffening up the frame and using flexible springs is superior to frame flex.
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