Automatic container welding and manual welding both exist
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There is a vessel with a diameter of DN3000 and a wall thickness of 16; due to the presence of fixed components inside, is it possible to carry out partial automatic welding and partial manual welding for the innermost ring weld? (There is a section where internal components get in the way, making it difficult for the submerged arc welder to function); the equipment requires 100% radiographic inspection
This approach is fine; one just needs to pay attention to the treatment of the joints where submerged arc welding and manual welding meet, in order to avoid welding defects.
No problem at all – as long as PQR is met and the flaw detection is successful
Isn’t the last circumferential weld just manual welding plus automatic welding?
For the last circumferential weld, an internal groove is created; it is welded using shielded metal arc welding. The root area is cleaned using carbon arc gas gouging, followed by grinding with an angle grinder, and finally the weld is covered with submerged arc welding.
Usually the last circumferential weld, but it is done with both manual and automatic welding.
As long as the weld meets the requirements, it is possible to do this
It should be possible; just keep the relevant records
As long as the X-rays can pass through, proper recording and following the procedures are sufficient.
Make sure it is consistent with the process...
Of course, as long as the weld quality is ensured (non-destructive testing must pass), and additionally, the welding procedure specification (WPS or welding procedure guide) needs to be modified