CO2 gas shielded welding qualification
Thread Content
I would like to ask the teacher: we have the qualification for manufacturing pressure vessels, and our daily production equipment consists mainly of conventional equipment (such as open-type equipment that is not under pressure). How should we handle the welding qualification assessments for such conventional equipment? Can we simply use the standards for pressure vessel welding assessments as a reference?
The standard for ordinary atmospheric pressure vessels is NB/T 47003.1-2009; this standard specifies that the welding of the main welds must be carried out in accordance with the welding procedure qualification requirements for pressure vessels, and welders must also possess the appropriate qualifications as required by those standards.
During the welding of conventional equipment, carbon dioxide gas shielded welding is used for thin sheets; however, it is not employed in the weld evaluation of pressure vessels. In such a case, is it necessary to conduct a new weld evaluation, and which standards should be used for that evaluation?
I’ve always wondered why CO2 gas shielded welding can be used for long-distance pipelines, but not for pressure vessels. Could this approach be tried in China?
Atmospheric pressure equipment does not require weld procedure qualification. If necessary, it can be carried out in accordance with NB/T47014.
Who says that pressure vessels can’t be welded using carbon dioxide gas shielding? We’re using it right now!
Could you tell me more in detail? How thick is the board?
Conduct process evaluation in accordance with the scope specified in NB/T47014; plates of any thickness are acceptable!
If you are using it, how is the weld evaluation conducted? In which parts is it used? Could you show me the weld evaluation? Affected party, could you please tell us what organization you work for? In Tianjin, it seems that the boiler inspection agencies don’t allow the use of MIG welding?
cxd11888 posted on 2016-1-28 11:44 Who says that pressure vessels cannot be welded using carbon dioxide gas shielding? We do use it! Can you talk about it? I hope you’ll leave a message or share some welding assessment related to this when it’s launched on floor 8