Advice on a sleeve for inside the longitudinal |
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Advice on a sleeve for inside the longitudinal |
doug_b_928 |
Jul 19 2017, 12:22 PM
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#1
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Senior Member Group: Members Posts: 692 Joined: 17-January 13 From: Winnipeg Member No.: 15,382 Region Association: Canada |
I'm repairing the passenger long. I've removed the rust and welded in two patches that comprise the bottom 2/3 of the long. To strengthen the long due to the welding I've made a sleeve out of 18 gauge cold rolled (same material as the patches) that is 36" long as pictured below.
The problem is that the 90 degree bend in the sleeve has made it tough to bend to the exact shape of the long for a tight fit. I put clamps on it and then with a hammer and punch beat it at the back (as shown by all of the pock marks). I think if I start welding it at the front and then do the hammer and punch thing as I go along it will probably conform to the long. But, I'm not 100% sure and would hate to have it half welded in and realize that the last 1/3 will not fit tightly. I could also make an 18" relief cut along the bend, bend it to conform, and then weld the sleeve to that shape prior to welding it to the long. I was going to run a bead on the black lines to make it more stiff, but figured that would make it even harder to make conform to the shape of the long when welding it in. So, I guess another advantage to the relief cut method might be that I could put a couple of beads in the sleeve (though perhaps that might also throw the fitment out of whack and put me back to square one with welding it in being more difficult). So, my question is, which is the best way to proceed. Take a chance on being able to bend it as I weld, or make the relief cut to fit it prior to welding it in? And, if the latter, should I put a couple of beads on the sleeve? |
doug_b_928 |
Jul 21 2017, 05:46 PM
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#2
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Senior Member Group: Members Posts: 692 Joined: 17-January 13 From: Winnipeg Member No.: 15,382 Region Association: Canada |
I think what Brett is saying is that the sleeve I have is kind of like a reverse Engmann (because it's on the inside), and so might be sufficient. But, if I understand correctly, you were suggesting to install my sleeve and then add one strip of 1/8" plate on both horizontal planes. I'm installing the sleeve to strengthen the long because I've welded in patches such that the bottom 2/3 are new metal, so I don't know where that puts me with respect to chassis stiffness as a starting point relative to a new long that has never been cut.
The maximum length of a single piece of plate could only be the distance between the locations where the heater tubes are welded to the long (I'm keeping the heater tubes) on the top side. So, that would be about 25" give or take an inch. Probably 2" wide would be the widest it could be. On the bottom it could run from the heater tube at the front to the back of long (about 35"). I'm still left wondering whether or not it's something I should do. If my sleeve is kind of like an Engmann, even given that it's there to compensate for the welds, perhaps that's strong enough for my needs.... I'm not an engineer and not really sure how to weigh the costs-benefits of adding the plates vs. the downsides (e.g., extra weight). |
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