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Old December 29th, 2009, 11:57 AM   #1
Raymo
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Exclamation Frame lengthening/ boxing question.

Alright, I'm building a 10ft. bed, regular cab Cummins powered Chevy in the rig builds category. I lengthened my original 8ft. bed frame with a 24" setion from another frame, and started fish plating it with 5" square 1/4" plate. My plan is to also box the entire frame, but have recently been told it might not hold up and is more prone to cracking that way, since it's partially boxed from the factory for a reason.

This is the outside of it, butt welded, and the inside will have the plate. Should I be doing this differently? Should I skip the frame boxing?

If it's not going to hold up I have no problem blowing it apart and doing it right. I just want to hear from the fabricators that have more experience with this kind of thing than me.

I should also add that I'm using a 160 amp welder, frame is 1/4" thick, and I V'd the rails out about half the thickness. It blued the rails about an inch either side so I figured I got it hot enough. And to box it I want to use a 5' long, 7.75" tall, 3/16" thick plate thats broke over 1" on top and bottom to slip over the existing rails.


Last edited by Raymo; December 29th, 2009 at 12:06 PM.
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Old December 29th, 2009, 11:29 PM   #2
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I would just fish plate the outside of the frame on top of the butt welds. 1/4" plate with a nice <=====> shape to it will keep it in check. I've seen people cut the frame sections at a 45 degree angle to get more weld length and more strength as a result... but it looks like you've got it pretty well welded up.

Last edited by DUNE JUMP; December 29th, 2009 at 11:33 PM.
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Old December 29th, 2009, 11:38 PM   #3
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Awesome, that's what I was hoping to hear.
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Old December 30th, 2009, 12:36 AM   #4
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I would have a piece broke that fits inside the frame rails, tight but not a press fit...cut it to span the length of the extension and about 6-12 inches past on each side, and put it in facing the same direction, making a double frame in that section, not a box...the strength is in the corners, so thats where you really need to make sure it doesnt pull apart
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