I believe Dan is saying not to weld it to the floor in that thread. "Long stress riser at the weak point of the floor" There was a tread somewhere that touched on the subject. The floor wasn't very uniform from the factory and that played into the 1" lip not interfacing with the floor. When I did mine I just welded the low side of the slot in the fold.
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Can you explain where you see this ?? & why you think this ??
The 'long stress riser' he talks about in the 1st post is talking about other brands that do not have the lip....weld them to the frame only with no lip and the frame becomes stiff, and stress could cause a shearing action at the junction of the floor to the frame since it is a thin area with only factory spot welds. The weak point is the junction of the very stiff frame and the very flexible floor. When you weld the lip on, that weak point goes from ~ 1/8" wide to 1" wide, and is no longer a weak point, unless you weld it too much.
As in anything, when a thin piece of metal is attached to a thicker or stiffer piece of metal, the joint between the two is a weak point, since they move differently, the joint can work harden and crack/break. Take the crack prone metal at the door hinges on cherokees. The stiff hinge plate moves and flexes the thin sheet metal every time the door is opened, and over time, the sheet metal cracks. Well, if you have a plate on the backside of the thin sheet metal to spread the load over a larger section, or added metal to the base of the hinge plate to make it's footprint on the sheet metal larger, the tendancy to crack would be much less.
I ain't no engineer, but here's how I see it.....
With the lip welded, that thin area at the floor to frame junction is now 1" wide, the floor is now stiffer/stronger, and has the factory spot welds plus the welds from welding the lip to the floorpan, so there is no shearing action possible since the floor is now part of the frame support. When welded, the lip will provide support from the floor pan sagging or being pushed up (stops flexing, which is what cracks the floor pan).
With the lip not welded, the lip will give support, but their is no added strength in the thin junction area since you still have only the factory spot welds, and while you do have some support, there is nothing that stiffens the floor pan or attaches it to the lip for the added strength. Unwelded, the lip will only give support from the floor pan sagging (doesn't stop flexing, and only limits it in 1 direction).
Think of it this way.....the stiffener is a knife, and the floor pan is butter.....is it easier to push the knife thru the butter with the blade straight up & down (as in stiffeners with no lip), or flat (as in stiffeners with a lip).
