Rolling methods for cylinders of different wall thicknesses
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The cylinder diameter is 4m and the plate thickness is 16; there is a rear wall plate measuring 26x300x5000 in the circumferential direction, which was formed by rolling and then having its rear wall section welded after the opening was created. It’s better to first carry out patch welding on the rear panel before rolling it. Do any experts have any experience to share?
Sure, each volume is separate, and then they are welded together.
This post was last edited by wanlirn on 2017-4-25 at 13:12. Assemble it first and then roll it up – this saves material and effort. If each part is rolled up separately, it’s difficult to align them properly. We have done this before, using the next section as a reference; your version is 300 wide. The designer probably planned it this way to meet the requirements of GB150 regarding the minimum length of sections, allowing them to be arranged as a single section. For differences in thickness, it’s fine to use spot welding along the circumferential direction of the rebar, either twice or three times as a supplement. . . Reinforcing bars can’t just be left straight either; they’re used to make tie rods for heat exchangers
Inlay it at the back of the coil; the thickness difference is too large, and there will definitely be problems with the coil after welding. I really have never seen a structure like this before; what kind of container is it?
It is a dust collector, with rows of holes that serve as a form of overall reinforcement
Mainly, this isn’t a full round; I don’t have the experience to try it :(
If the coil is rolled properly, the welds at the ends are prone to cracking, and when there is a large difference in sheet thickness, the ends do not roll into a perfect circle
Roll them separately, make the holes and then insert them – no problem. Taking into account the welding shrinkage deformation, appropriately increase the arc length of thick plates, and strictly control alignment and welding.
The last edit to this post was made by wanlirn on 2017-4-27 at 11:49. You’re overthinking it; I maybe didn’t explain myself clearly. Look at the diagram – that’s how we do things here. The diameter is 2200, using 12+24 layers of Q345R material. The green ones are the 12-mm rebar, with intermittent weld points on the thin plate
Well, thank you. Finally, it’s rolled using this method; we use spot-welded steel strips
The two types of steel plates have different wall thicknesses, the same inner diameter, but different outer diameters; it is difficult to ensure roundness and weld quality near the joints formed by these uneven-thickness longitudinal seams. Each part can be rolled into shape first (the fold amount can be retained before cutting); once it passes inspection, a template is laid out, positioning blocks are spot-welded according to the template, and then the parts are assembled with the longitudinal seams welded together.