T/DASIV 005-2024 Active Group standards

T/DASIV 005-2024 Full-position narrow gap laser welding specification for thick austenitic stainless steel tube technology

Publish Date: 2024-10-31 Implement Date: 2024-11-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/DASIV 005-2024

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: -

ICS Name: \nWelding process

Publish Date: 2024-10-31

Implement Date: 2024-11-01

Scope

Main technical content: The thick-walled austenitic stainless steel pipelines in current nuclear power stations have the characteristics of narrow welding operation space on site, the need for full-position welding, and high-quality welding seams. At present, for the thick-walled austenitic stainless steel pipelines in operating and most under-construction nuclear power stations, welding methods such as electrode arc welding, submerged arc welding, and tungsten inert gas shielded welding are mainly used in welding construction. However, these welding methods also have obvious disadvantages, including high labor intensity, long construction period, low welding efficiency, and difficulty in controlling and ensuring the quality of welding seams. Narrow-gap laser welding technology is a potential new welding method for thick-walled structures, which combines the advantages of narrow-gap groove welding and laser welding. It can save the cost of welding repair, improve the quality of welding seams, shorten the construction period, and has good economic benefits and application prospects. It can also achieve full-position laser automatic welding of main pipelines in nuclear power stations, realizing the goals of high efficiency, safety, and low cost in nuclear power station construction. At present, the third-generation nuclear power stations have started research on laser welding technology. Due to safety considerations during nuclear power station construction, the welding process evaluation refers to ASME and RCCM standards. At present, there are no welding technical specifications suitable for laser narrow-gap welding technology of thick-walled stainless steel pipelines. Therefore, this technical specification is formulated and relevant parameters and equipment are recommended, with the aim of serving the construction of new-generation nuclear power stations through welding process evaluation, enhancing the automation level in the field of nuclear power construction, b