Girth welding technology for vacuum container

A technology of circumferential seam welding and vacuum container, applied in welding equipment, manufacturing tools, arc welding equipment, etc., can solve the problems of concave, welding deformation, etc., to control welding deformation, avoid local high temperature, and ensure absolute welding penetration. Effect

Active Publication Date: 2012-02-22
无锡市创新低温环模设备科技有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that welding deformation and concave phenomenon are easy to occur when the traditional large-scale vacuum vessel is welded, and to provide a va...

Method used

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  • Girth welding technology for vacuum container
  • Girth welding technology for vacuum container

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Embodiment Construction

[0016] Such as figure 1 In the shown embodiment, the welding process of the vacuum vessel girth according to the present invention includes three steps of groove processing, assembly and welding.

[0017] In the groove processing process, the Simplified base material is made of 0Cr18Ni9 austenitic stainless steel material with a thickness of 14mm, and an X-shaped groove is used, the inner groove is processed by 10mm, the unilateral angle α is 32.5°, and the outer groove is processed by 4mm. The edge angle β is 35°, and no blunt edge is left.

[0018] During the assembly process, a gap of 2.0-2.5mm is reserved for assembly, and positioning is performed by argon tungsten arc welding. The length of the positioning welding is 10-15mm, and the interval is 200mm. Character support", avoiding the phenomenon of uneven speed and up and down jumping when the cylinder is rotated on the roller frame during welding due to the large diameter of the cylinder and the low roundness of the sim...

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Abstract

The invention discloses a girth welding technology for a vacuum container, which comprises the following steps: processing beveled edges, assembling and welding. In the step of processing the beveled edges, a 14mm thick 0Cr18Ni9 austenitic stainless steel material is selected as a cylinder base material, X-shaped beveled edges are adopted, an inside beveled edge is processed for 10mm with a single-side angle of 32.5 degrees, an outside beveled edge is processed for 4mm with a single-side angle of 35 degrees, and no truncated edge is left. In the step of assembling, reserved clearances of 2.0-2.5mm are assembled, argon tungsten-arc welding is adopted to position, a positioning welding length is 10-15mm, an interval is 200mm, and then a 'strut having a shape of Chinese character 'mi' which is used for adjusting the roundness of a cylinder is welded in the cylinder. In the step of welding, an argon arc welding double-gun butt-welding method is used for bottoming the interior of the cylinder, two layers are filled in an inner welding bead of the cylinder in the manner of manual arc welding, an external welding bead is covered in the manner of submerged-arc welding, and finally, the inner welding bead is covered in the manner of manual arc welding. The girth welding technology can be used for controlling the welding deformation and has the advantages that the method is simple and is easy to realize.

Description

technical field [0001] The invention relates to the welding field of vacuum containers, in particular to a circular seam welding process of vacuum containers. Background technique [0002] Vacuum vessel refers to a pressure vessel that works in a vacuum environment. The welding of the vacuum vessel is the key to ensuring its compactness and strength, and an important condition to ensure the safe use and operation of the vacuum vessel. If there is a defect in the welding, it may cause leakage , leakage, or even cause the container to explode, causing casualties and heavy losses of national property. There are many types of pressure vessel welding defects, which can be divided into external defects and internal defects according to their positions. Common defects include pores, slag inclusions, welding cracks, Incomplete penetration, incomplete fusion, undercut, weld bumps, arc craters, etc. [0003] At present, when welding the circular seam of a large vacuum vessel, concave...

Claims

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Application Information

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IPC IPC(8): B23K28/02B23K33/00B23K9/00B23K9/167
Inventor 何桂华
Owner 无锡市创新低温环模设备科技有限公司
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