Head and shell welding structure
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Is double-sided welding mandatory for the welding joint between the pressure vessel head and the cylinder? Are there any standards that permit single-sided welding in such cases?
For pressure vessels that are subject to inspection requirements, not only must double-sided welding be performed, but flaw detection is also necessary.
The so-called double-sided or single-sided welding is determined solely by the type of groove you use.
Single-sided welding is possible, but TIG welding is required for the root pass
Is there any specification regarding single-sided welding? In Appendix D of 150.3, I only found some example diagrams of welded structures
It is a container intended for inspection; the flaw detection showed no issues. It’s just that some of its structures are not suitable for double-sided welding – cannot single-sided welding be used instead?
It is a container intended for inspection; the flaw detection showed no issues. It’s just that some of its structures are not suitable for double-sided welding – cannot single-sided welding be used instead?
For Type A and Type B joints, double-sided welding should be used whenever possible; if that is not feasible, single-sided welding with double-sided formation can be employed, or even a structure with gussets can be used. Ensure full penetration.
Containers with a small diameter cannot be welded on both sides; they can only be welded on one side
Single-sided welding and double-sided welding are related to the design pressure and the thickness of the main material. Single-sided welding with double-sided formation is also a type of double-sided welding
The method of welding is a question, but what matters is whether the test results meet the requirements, such as the required wall thickness and the welding specifications regarding unevenness.