The cylinder body is composed of 11 cylinder sections, and the groove on the four sides of the steel plate for making the cylinder body is processed by a planing machine, and then rolled by a coiling machine, and the size and shape precision can meet the design requirements. The difficulty in manufacturing large-diameter stainless steel cylinders is the control of the ovality and verticality of the cylinder as well as the quality of the weld and its tightness.
   The cylinder is assembled and welded by a vertical assembly method, and the reference of the first section of the cylinder section is a plane. In order to ensure the quality of the welding, the following control measures are applied during welding.
1 . Control of cylinder ellipticity
   During the welding process, ensure that the lateral shrinkage of the inner and outer sides of each longitudinal weld is equal or similar. For this purpose, a large or equal stiffness П-shaped plate can be welded to the inner, outer and upper, middle and lower parts of the weld to control the lateral shrinkage of the weld inside and outside. Each weld is designed to be machined into an asymmetrical X -shaped groove with a large inside and outside. First, the back cover welding and the second layer welding are performed on the inner side, and the outer side is deeply rooted. After the outer side is welded to the cover surface weld layer, the inner weld seam is applied to the cover surface weld layer. Through the welding sequence and the thickness of the weld layer, the deformation of the inner and outer corners of the weld is controlled to be equal or similar, and then the П-shaped plates on both sides are used to make the inner and outer corners of the weld be almost equal, so that the ellipticity of the cylinder is less than 10 mm. .
2 . Longitudinal seam lateral shrinkage control
   To make the barrel section vertical, the amount of lateral shrinkage of the upper and lower parts of the splicing vertical joint or the full length of the vertical joint should be uniform. To ensure that the lateral contraction of each vertical seam or the entire length is equal, the upper end surface and the lower end surface of the cylinder section should be parallel and both horizontal planes. And so on, 17. 6m cylinder verticality can fully meet the design requirements.
   During the initial welding of the inner side, each vertical joint is divided into four equal parts or five equal parts, and the inner and outer sides are all welded by the top-down section back-welding method, so that the upper lateral contraction is smaller than the lower end. From the third layer on the inner and outer sides, the bottom-up through-welding and symmetrical welding are used. The upper lateral contraction is larger than the lower part, which offsets the lateral contraction of the lower part than the upper part during the initial welding, and is supplemented by the rigid fixation of the inner and outer and the upper, middle and lower II plates to ensure uniform and uniform lateral contraction of the weld seam, thereby ensuring uniformity of the weld seam. The amount of lateral shrinkage of each weld is equal.
3 . Control of lateral contraction of circumferential seam
   In order to ensure the verticality of the cylinder, in addition to the full-length lateral contraction equivalent control of the longitudinal section of the cylinder section, it is necessary to strictly control the lateral contraction of the annular joint between the cylinder sections: the rigid rigid shaped panel is equally spaced along the entire length of the weld Eight welders simultaneously use the same welding process parameters (welding current, welding speed, welding rod diameter, weld thickness, moving strip method, welding direction) segmented jump welding, so as to strictly control the lateral shrinkage of the circumferential weld, so that each The center of the barrel loop is in a horizontal plane.
   The II-plate rigid fixing method and different welding sequence and groove shape are adopted, and the segmental back-welding and through-welding methods are used at the same time to ensure that the verticality and ellipticity of the cylinder meet the design and use requirements.
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