Can a welder who has passed the welder’s exam and is capable of welding at 6G weld positions weld all areas of a spherical tank, using steel pipes with a thickness of 12 mm?

Whether all areas of a spherical tank can be welded depends not only on whether the welder has passed the examination, but also on factors such as the welding process, materials, as well as the design and requirements of the spherical tank. In terms of welding processes, since spherical tanks usually have complex shapes and profiles, the welding difficulty and requirements vary depending on the location, necessitating the use of appropriate welding methods and techniques to carry out the work. For example, when welding the top and bottom of a spherical tank, special techniques such as inverted welding or overhead welding are required, while welds inside the spherical tank need special methods like wall-mounted welding and angled welding to be carried out. Therefore, when welding spherical tanks, it is necessary to select appropriate welding techniques and methods based on the specific circumstances. In terms of materials, spherical tanks are typically manufactured from high-strength steel plates, and welding materials and electrodes that meet the required standards must be used to carry out the welding process, in order to ensure that the quality and performance of the welds are satisfactory. At the same time, depending on the operating environment and requirements of the spherical tank, the welding materials also need to be selected based on actual conditions. Furthermore, the design and requirements of the spherical tank are also one of the key factors affecting welding. When welding spherical tanks, it is necessary to follow relevant design codes and standards, such as ASME codes. Depending on the application, medium, pressure, and other requirements of the spherical tank, corresponding inspections and evaluations are necessary to ensure welding quality and reliability. In summary, passing the 6G exam by a welder does not mean that they are capable of welding in all areas of spherical tanks; it is necessary to select appropriate welding techniques and methods based on specific circumstances, use materials and electrodes that meet the required standards, and follow relevant design specifications and standards for inspection and evaluation, in order to ensure the quality and reliability of the welds. .

The same welding method, the same material, the same welding filler, and the same protection measures are acceptable.

I’m sorry; I didn’t explain clearly regarding the materials when asking the question. Thank you for your replies, teachers. Could you please discuss the welding location? The material is specified in Table 6002. I would like to ask the teachers whether the welding location is acceptable?

Teacher, could you please tell me if the materials meet the standard requirements, what else might be problematic? Thank you for your reply. Looking forward to a reply, thank you.

This post was last edited by ftxswb on 2023-3-26 at 14:36. It’s not accurate to say the same material and the same welding material; rather, it should be materials from the same category, welding materials of the same grade, or materials and welding materials that are compatible with each other； Once pipe 6G meets the requirements, it can be welded in vertical, horizontal, and upside-down positions; the required thickness for testing is 12 or more, and there are no restrictions regarding the thickness at which welding is performed.

The single welding position 6G can weld any butt welding position.

It would be appropriate to provide the welder exam code as well as the material for the spherical tank.

Just in terms of location, a welder from FG is still needed, I guess

There is such a requirement in TSG 07-2019 C2.2.3.1, so I am asking the teachers on the forum.