Question: Weld joint types for large seamless end caps
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The company has received a piece of equipment with the following specifications: the inner diameter of the cylinder is 5000 mm, the wall thickness is 16 mm, and the length is 10500 mm. The medium used is water, and the operation takes place at atmospheric pressure. The end cap used is a spherical type, with SR=3665 mm and H=1000 mm; its thickness is also 16 mm, which means it is what is referred to as a seamless end cap； There is now a disagreement regarding the method of joining the head to the cylinder. The head manufacturer has completed pressing but not yet trimmed the edges. They suggest that the head be fitted inside the cylinder, and after welding on the inside, the excess outer material be cut off, followed by grinding of the weld seam before proceeding with welding ； I now want the end cap manufacturer to trim it to an inner diameter of around 5000–5010, with the outer groove using a butt joint style; after welding, gas gouging should be done on the back side, as shown in the diagram below. I would appreciate some advice from experienced sea travelers; thank you!
For completeness, the equipment is horizontal with 4 custom saddle supports
First: The head you described is a cone, right? Since its height H is 1000, it isn’t a perfect sphere. Second: Inserting the head into the cylinder actually constitutes edge misalignment during assembly. Your suggestion has flaws; if you use right angles on both sides, at least ensure that they are aligned internally so as to form a natural beveled groove. This is because what you have here is a standard Type B ring weld, not a lap joint or any other type of weld
Thank you for the information provided! In the first two days I asked the end-cap factory to trim the edges in the style shown above, but it seems that the second option fits what I described better. However, conceptually, the upper style resembles the butt joints commonly used in our containers, while the lower one would correspond to fillet welds; moreover, a tank created by incorporating this into the cylinder body wouldn’t look as good with butt joints