Tube sheet component and bottom head component circumferential weld local heat treatment technology

Abstract

The invention relates to a tube sheet component and bottom head component circumferential weld local heat treatment technology. According to the technology, a stepped heating mode is adopted for conducting heating treatment on weld, and the problems that the tube sheet component and bottom head component circumferential weld in a steam generator is large in thickness and complex in structure, andtemperature control is difficult due to the fact that all parts are made of different materials are solved.

Description

technical field [0001] The invention relates to a welding seam heat treatment process, in particular to a local heat treatment process for the circumferential weld seam of a steam generator tube plate assembly and a lower head assembly. Background technique [0002] At present, most of the steam generators manufactured at home and abroad are composed of a tube-sheet assembly (or called a lower cylinder assembly), a head assembly and a tube bundle assembly. The girth weld between the tube sheet assembly and the lower head assembly is used as the general assembly weld, and the safety end of the primary side connection pipe and the U-shaped heat exchange tube have also been assembled and welded. The welding of the steam generator tube plate and the lower head is an important process of the final assembly of the whole product. At this time, tens of thousands of heat exchange tubes are installed on the tube plate and the welding of the tube ends is completed. The center of the tu...

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Problems solved by technology

[0006] In order to overcome the above-mentioned problems, the present inventor has carried out intensive research and designed a local heat treatment process for the girth weld of the tube-sheet assembly and the lower head assembly. Then air cooling, not only solves the temperature control problems of the thicker thickness, complex structure

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