Minimum width for head jointing?
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I’ve encountered a problem recently: I need to order steel plates for a spherical head of an autoclave with an inner diameter of 2.55 meters, a plate thickness of 24 mm, and a cutting diameter of 2620 mm. In the end, it was decided to order steel plates with a width of 2500 mm and a minimum splicing width of 120 mm. A great deal of relevant information was gathered, and many experts were consulted, including the chief engineer of the Technical Supervision Bureau; all of them said that this met the regulations and there were no issues. What do you all think?
Is the cutting diameter for a spherical head with an inner diameter of 2.55 meters only 2620 mm?
Just ensure the manufacturing performance! Worried? Do a mechanical analysis!
I don’t know where I saw this information either; the splicing ratio for the end plates is 1:2 or 1:3
The spherical head is welded to the kettle lid flange; it’s not a hemispherical head, just a part of a spherical head
This thickness isn’t particularly thick, so there’s no need to choose such a wide sheet of material. And it’s relatively expensive
It is not prohibited by regulations, but it is not recommended to do so; the weld seam will be located in areas where shape changes result in high edge stresses
Since steel plates are being ordered, if they aren’t wide enough, order narrower ones; otherwise the seams will be too close to the flange welds, which is not good
This post was last edited by wanlirn on 2019-3-27 08:53. The crown is fine – the deformation is minimal; it seems to be of type R=1D. Wide-format plates are significantly more expensive, and shipping costs are high as well, making it not worth it
I’m not from the welding field, but I’d like to ask: for such thick plates, what is the size of the heat-affected zone of the weld?