Nickel-base welding wire dissimilar metal cold wire TIG all-position welding method

Abstract

The invention discloses a nickel-base welding wire dissimilar metal cold wire TIG all-position welding method used in a welding process of a connection pipe of a main device pressure container in a nuclear island and a connection pipe safety end, and comprising the steps: pre-processing a plurality of to-be-welded connection pipes of the main device pressure container in the nuclear island and the corresponding connection pipe safety ends; and randomly selecting the plurality of to-be-welded connection pipes of the main device pressure container in the nuclear island and the corresponding connection pipe safety ends for performing all-position welding butting joint simultaneously so as to finish the welding of the connection pipes of the main device pressure container in the nuclear island and the corresponding connection pipe safety ends. According to the method disclosed by the invention, the welding period is short, and welding defects of air holes, slag inclusion, non-fusing and the like can be effectively avoided simultaneously.

Description

technical field [0001] The invention relates to a welding technology, in particular to a nickel-based welding wire dissimilar metal cold wire TIG all-position welding method, which is used in the welding process of the nozzle and the safety end of the nozzle of the main equipment pressure vessel of the nuclear island. Background technique [0002] In the prior art, the shell of the reactor pressure vessel of the AP1000 type or Hualong No. 1 nuclear power plant is generally made of SA508Gr. Tensitic stainless steel 316L or Z2CND18-12 (nitrogen control). In order to ensure the quality of nuclear power equipment, a section of stainless steel pipe (called "safety end") is generally welded on the connecting pipe of the nuclear container shell, and then the safety end is welded to the stainless steel pipe during on-site installation. Therefore, the above-mentioned process involves the welding technology of the joint of the shell of the nuclear vessel and the joint of dissimilar m...

AI Technical Summary

Problems solved by technology

However, the above-mentioned prior art not only has a long cycle time, but also tends to have welding defects such as air holes, slag inclusions, and lack of fusion in the actual operation process. Therefore, there is an urgent need to improve this type of welding technology

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