【Haichuan Equipment Guessing Game】What are these small squares on the circumferential welds for?
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What are those small squares on the circumferential welds for? Isn’t it supposed to avoid overlapping welds as much as possible?
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They are supposed to serve a fixing purpose; before performing circumferential welds, these small squares are used to align and fix the upper and lower parts together
But from the picture, it can be seen that the circumferential weld has been completed
It should be the existing small square piece, with a circumferential weld at the back; instead of removing that small square piece, it was also welded in place. I’ve seen this type of small square piece used in the construction of storage tanks, but in those cases it was removed later on, as it wasn’t permanently welded in
The positioning block is to be removed after the base welding
It’s possible, but wouldn’t setting the shims in that way violate the general principles for cross welds?
The small square should be welded after the circumferential welds have been completed, to serve as a gasket.
This is for an ethylene production facility in the north