Typical glass-lined pipe fitting process
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Typical glass-lined pipe end forming process: punching hole
Please ignore the cracks caused by inadequate execution of the operations shown in the diagram
It looks like there’s a manufacturing defect; why is there a gap there?
Yes, that’s a flaw that needs to be avoided
For this type of crack defect at the top edge, can it be repaired by grinding and welding before proceeding with enameling? How to handle it? Are there any SOPs for reference? Thank you
At a glance, I can tell you’re an expert: lol
Haha, keep pretending. Anyway, it can’t be seen from the outside; who knows? There are countless ways to deceive people. . .
It’s a good idea, and most people do it that way, but in the end it harms both others and oneself: lol
Punching of manholes on the head should avoid the joint plates of the head; this is also caused by too low punching and heating temperatures.
Try to use large panels; since this device is quite large, it requires splicing. The pipe opening shown is not a manhole; clearly, the layout was arranged to avoid large openings as much as possible. As you said, it should be the heating temperature, and that at the weld area, which is what caused the cracks to occur