Method for controlling deformation generated when connection pipe is welded to large-diameter thin-wall barrel

Abstract

The invention relates to the field of thin-wall workpiece welding and discloses a method for controlling deformation generated when a connection pipe is welded to a large-diameter thin-wall barrel. According to the method, the amount of actual deformation is small. When the large-diameter thin-wall barrel is welded to the connection pipe connected with the large-diameter thin-wall barrel, an inner groove is adopted as a connection pipe groove in the barrel, and the two sides of the connection pipe groove in the barrel are provided with inner supports used for supporting the inner wall of the barrel; after the connection pipe is connected with the barrel through spot welding, the position of the connection pipe is adjusted, so that the connection pipe is located below the barrel, a circumferential welding line of the connection pipe is divided into an even number of welding line segments, welding of each welding line layer is completed through two rounds of segmented symmetry welding, welding of a half of each welding line segment in the length direction is completed in each round of segmented symmetry welding, and the next layer is welded after all the welding line segments on the upper layer are welded. The whole welding line is divided into a plurality of regions, a layered and regional welding sequence of the welding line is worked out, and therefore heat input is controlled well, welding deformation is reduced, and the problems that the large-diameter connection pipe droops and the barrel deforms are solved.

Description

technical field [0001] The invention relates to a welding method when welding a connecting pipe on a cylindrical body, in particular to a welding deformation control method when welding a connecting pipe on a large-diameter thin-walled cylindrical body. Background technique [0002] At present, in the field of coal gasification, environmental protection equipment and other chemical industries, there are a large number of thin-walled cylinders, and most of these cylinders have thin walls and large diameters. Generally, their diameter / wall thickness ratio is above 120. These cylinders There are different numbers of large-diameter connecting pipes on the surface, these connecting pipes are mainly forgings, and the weight is relatively large. When welding such connecting pipes on the cylinder, manual welding is usually used, and the connecting pipes are placed on the top of the cylinder for welding. It often causes different degrees of nozzle collapse and cylinder deformation. ...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the existing problems of relatively large deformation and difficult correction when welding the connecting pipe on a thin-walled large-diameter cylinder, the technical problem to be solved by the present invention is to provide a control large-diameter thin-walled cylinder with a small actual deformation. The Method of Welding Deformation of Nozzles on Body

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