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Old July 8th, 2012, 05:46 PM   #1
Derek B
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Default frame repair

Ok so Spudy and I are going to be welding the good front 1/2 of the frame under my tj. To the good back 1/2 of a frame I got last week. Looking to see what others have done for this as cutting goes and welding it. Post or message me or Spudy.
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Old July 8th, 2012, 07:13 PM   #2
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Any help with this would be nice
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Old July 8th, 2012, 07:23 PM   #3
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Old July 8th, 2012, 07:31 PM   #4
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Same models of jeeps?
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Old July 8th, 2012, 08:52 PM   #5
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How's the material thickness on the original half of the frame? The frame isn't real thick to begin with, and they rust out bad from the inside.

The generally accepted process is to weld the frame back together first, then weld on plates that go a few inches each way past the seam, that are as tall as the frame (so about 3.5" tall on the TJ, since the frame is 2.5 x 4 but has radius on the top and bottom. most people make the ends diamond, rounded, fishmouths, etc, for fear of vertical seams cracking.

This is what I've done on my lengthened TJ frame under my CJ6. I was surprised how must the rust had thinned the frame from the inside.
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Old August 28th, 2012, 05:36 PM   #6
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Welding/splicing the frame can be tricky...mainly on vertical welds in high stress areas

Few terms to search before you start...

Heat/stress riser
"z" cut
Fishmouth plate

You also want to make sure you're material thickness is relatively close...thicker material will act like a heat sink and pull the heat out of the thinner faster than two pieces of the same thickness...could potentially make the thinner metal extra brittle (crack with frame flex)
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