Girth welding technology for vacuum container

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...

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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 vacuum vessel circumferential seam welding process, which can effectively control the welding deformation, and will not The concave phenomenon is produced, which has the advantages of simple method and easy realization

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