Processing welding technique of large closing end

A welding process and head technology, which is applied in the field of large-scale head processing and welding technology, can solve the problems of increased local stress, difficulty in controlling welding deformation, and sudden change in shape, and achieve the effect of eliminating sudden change in shape

Active Publication Date: 2008-12-31
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

In the traditional process, the shape of the stamping forming of the top circular plate and the stamping forming of the petals are coordinated with each other. However, when the petals are assembled and welded into a part of the head, the residual stress during stamping is released and welded due to welding heating. Thermal expansion and contraction during the cooling process make it difficult to control welding deformation....

Method used

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  • Processing welding technique of large closing end
  • Processing welding technique of large closing end
  • Processing welding technique of large closing end

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Embodiment Construction

[0016] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments:

[0017] Such as Figure 4 It shows that the head is mainly formed by splicing and welding the flap 1 and the top circular plate 2. The specific welding process is as follows:

[0018] Since the sodium-cooled fast reactor container is a non-standard container, (1) First, we process the flap 1 mold according to the specific requirements of the sodium-cooled fast reactor container, and determine the rebound amount through the process test of the flap 1 rebound amount, and then Repair the mold according to the determined rebound amount. (2) Press and form each flap 1 separately (3) Process the welding grooves between the flaps 1 and assemble and weld each flap 1 into a part of the head, such as image 3 Shown. (4) A part of the assembled and welded head is buckled on the platform for scoring, and the inner surface of the straight edge, the centerline circle...

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Abstract

The invention discloses a machining and welding process of a large sealed head. The machining and welding process comprises the following steps: 1) a lobe die is machined; 2) a lobe is punched for forming; 3) a welding groove of the lobe is made, assembled and welded; and a smooth curve is drawn between the lobe generatrix and the sealed head vertex after assembling and welding; a machining die of a top round plate is made according to the smooth curve, and the top round plate is formed by pressing the machining die; the welding groove is machined; the top round plate and the lobe are welded. The machining and welding process of the large sealed head has simple operating steps, and can eliminate the deformation near a butt seam, and the sealed head welded by the machining and welding process has nice appearance and good stress.

Description

Technical field [0001] The invention relates to the field of metal processing and pressure-filling welding, in particular to a processing and welding process of a large head. Background technique [0002] At present, because the head is the key pressure component of the pressure vessel, the quality of the head directly affects the use of the container, so the large head cannot be directly pressure-welded like the traditional small head, but is divided into several parts. Partly assembled, spliced ​​and welded. The traditional process of the traditional large-scale head is: 1. The petals and the top circular plate are respectively stamped and formed; 2. The petals are grouped and welded into a part of the head; 3. The welding between the petals and the top circular plate Splicing welds. In the traditional process, the shape of the top circular plate stamping and forming is coordinated with the stamping forming of the petals. However, when the petals are assembled as a part of the ...

Claims

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Application Information

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IPC IPC(8): B23P15/00B25H7/00F16J12/00
Inventor 鲍扬民杨志伸
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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