Issues regarding welding test plates for low-temperature vessel equipment, welding test plates for heads, and heat treatment test plates for base material

Regarding the welding and heat treatment test plates for 09MnNiDR low-temperature storage tanks, the requirements are generally determined based on specific design specifications and quality control standards. Here is one possible scenario: 1. Equipment welding test plates: Typically, a corresponding welding test plate is required for each type and location of weld; at least one welding test plate should be prepared for both the cylinder and the end caps (left and right end caps). 2. Head welding test plates: It is advisable to have a welding test plate for each head position; although the two heads may be similar in terms of manufacturing processes, to ensure quality, it is recommended that each head have its own separate welding test plate. 3. Base metal heat-treated test plate: If the material of the head and the shell is the same and the heat treatment process is identical, it is possible to combine the welding test plate for the head with the base metal heat-treated test plate, but it must be ensured that such combination meets the requirements of the technical specifications. For 12mm drum heads, whether a separate base metal heat treatment test plate is required depends on whether the material and heat treatment process differ from those of the main vessel body. 4. It is usually necessary to produce a test plate for the 12mm drum of the steam drum, in order to verify the suitability and effectiveness of the welding and heat treatment processes, unless it is specifically stated that this is not required. In summary, the actual number and type of test plates required should be determined with reference to the relevant welding and material handling specifications, while also taking into account design and quality assurance requirements. It is recommended to consult relevant experts in welding technology and quality control to ensure that all technical requirements are met. .

Two end caps are used to fabricate one end cap welding test plate. Exactly the same, and the entire forming process is the same as well; of course, one piece is sufficient. The base metal heat treatment test plate and the head welding test plate can be combined into one piece. (Additionally, standard 150-2011 does not specify this clearly; it is necessary to conduct a test on the head after it returns to the factory, as there is a risk that the head manufacturer may not have done it properly, and discovering that issue later would cause problems.) After stress relief of the entire equipment (as specified in the standards, this involves heat treatment in the same furnace, or a simulation of such treatment), another test should be conducted; bringing extra material along allows for two tests in total. 150-2024 specifies that 1 return to the factory for testing is sufficient). Is a base metal test plate also required for the 12mm drum head? I think it's necessary. After all, there is no such concept as what is covered by weld procedure qualification. Is it necessary to produce a test plate for the 12mm drum of the steam drum? No need; refer to clause 9.1.2.6 of the new version 150-2024 – the thickest strip under the same welding conditions is sufficient. If one insists on using 150-2011 and demands strict adherence to standards, then change the name of the drum shell to “connector” in order to avoid this issue.

If there is no final overall stress relief, the second section is simpler

Absolutely, that’s how many posts are replied to: L