Quote:
Originally Posted by Hope Springs Hauler
With my example, you brought another dynamic into it. When you screw/nail the 2x4's together, you are beginning to create a composite section; much like glu-lam lumber. Screws or nails that connect the sections experience a shear force that is generated along the interface and thereby connect the two pieces into a single composite section. For that situation to apply to the sleeved tubing, it would have to be plug welded in many different spots along the circumference and length so that the 2 pieces act as 1.
|
I had assumed this would be the case. Anytime you sleeve tubing (in a solid chassis) for repairs or in the construction, plug welding is mandatory. That's the only way I have ever seen sleeving used. A large tube for a frame rail that then extends forward/rear and the desired diameter is smaller then it is stepped down and everything plug-welded. The use of two tubes slid together for the length of a single span, welded on the ends and plug welded, in theory, seems very strong, but also heavy and likely wouldn't flex at all.
I'd have to go see my neighbor (crane engineer) to give me numbers and such.