A control method for the corner of the longitudinal butt weld of a cylinder

Abstract

The method for controlling the sharp angles of the longitudinal butt weld of a cylinder disclosed in the present invention comprises the following steps: preparation for group welding; determination of technical requirements for grouping the longitudinal seam of the cylinder; group welding of the seam; and measurement of the sharp angles of the weld. The method of the present invention is simple to operate. Without using any other measures or incurring additional costs, it accepts the inherent property of deformation of the welded cylinder during the welding process, utilizes the deformation and reverse deformation of the welded cylinder itself during the welding process, and according to the diameter of the welded cylinder, the thickness of the plate, the distribution form and size of the groove, etc., by pre-setting the grouping sharp angles and adopting an internal and external alternating and two-person, two-sided welding method during the welding process, the purpose of controlling the sharp angles of the weld is achieved, which can effectively ensure the welding quality and greatly reduce the cost of controlling the sharp angles of the longitudinal butt weld of the cylinder and the manufacturing cost of the cylinder. The method of the present invention is particularly suitable for controlling the sharp angles of the weld of cylindrical welded joints with a thickness greater than 20 mm and a double-sided groove.

Description

Technical Field

[0001] The present invention relates to the technical field of weld quality control in the field of industrial manufacturing, and in particular to a method for controlling the sharp angles of a longitudinal butt weld of a cylinder. Background Art

[0002] For cylinders made by rolling and welding steel plates, welding is a very critical link. On the one hand, the welding quality needs to be guaranteed, and on the other hand, the sharp corners of the longitudinal butt weld of the cylinder must be controlled so as not to exceed the standard. The reasons for the excessive sharp corners of the weld are often multifaceted. For example, when the steel plate is rolled, the curvature of its end does not meet the standard, welding deformation, etc. For the treatment of the excessive sharp corners of the longitudinal butt weld of the cylinder, the existing practice is to place the cylinder on a plate rolling machine and eliminate them by rolling it, or to eliminate them by using a tool clamping method. Although the above method can achieve the purpose of eliminating the excessive sharp corners of the longitudinal butt weld of the cylinder, it will incur large labor and machinery costs, and the clamping method is likely to cause stress concentration in the weld, affecting the quality of the weld itself. Although this impact is not the most critical, it is enough to bury quality risks. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method for controlling the sharp corners of the longitudinal butt weld of a cylinder, which is simple to operate, low in cost and can effectively ensure the welding quality, in view of the shortcomings of the existing technology. The method is particularly suitable for controlling the sharp corners of the weld of a cylinder weld joint with a thickness greater than 20 mm and a double-sided groove.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: a method for controlling the angle of the longitudinal butt weld of a cylinder, wherein D i Indicates the inner diameter of the cylinder, E indicates the weld angle, E' indicates the pair angle, δ S Indicates the thickness of the plate. The control method includes the following steps:

[0005] 1) Welding preparation

[0006] 1.1) Tool preparation: Make an inner template for measuring the curvature of the rolled sheet. The chord length of the inner template should not be less than D i / 6 and not less than 1000mm; make one inner sample and one outer sample for measuring the weld corners, and the chord length of the inner sample and the outer sample shall not be less than D i / 6 and not less than 300mm; and prepare welding gauges, assembly fixtures, and welding equipment;

[0007] 1.2) Technical Preparation

[0008] The gap between the groups should be less than 1mm;

[0009] Welding seam angle requirements: When 20mm<δ S ≤50mm, E≤3mm; when δ S When >50mm, E≤1 / 16δ S , and E≤10mm;

[0010] 1.3) Plate inspection

[0011] After rolling the sheet, use the inner template to measure the curvature of the sheet, which is required to be ≤2mm; use the welding gauge to measure the angle of the bevel on the sheet, which is required to have an angle deviation of ≤±2.5°, and measure the depth of the bevel, which is required to have a depth deviation of ≤±1mm; if the curvature, angle deviation or depth deviation does not meet the above requirements, the sheet will be repaired until it is qualified;

[0012] 2) Determination of technical requirements for longitudinal seam assembly of cylinder

[0013] Corner alignment: According to the distribution and size of the groove on the inner and outer sides of the welded joint, the groove is divided into three types: double-sided symmetrical groove, inner large groove and outer small groove, inner small groove and outer large groove. Depending on the thickness of the plate, the requirements for corner alignment are as follows:

[0014] Double-sided symmetrical groove: 20mm<δ S When ≤50mm, E'≤1.5mm; δ S >50mm, E'≤2.5mm;

[0015] Larger inside and smaller outside bevel: 20mm<δ S When ≤50mm, E'≥0.5mm; δ S >50mm, E'≥1mm;

[0016] Small inside and large outside groove: 20mm<δ S When ≤50mm, E'≤2.5mm; δ S >50mm, E'≤3.5mm;

[0017] 3) Perform group seam welding and select the corresponding welding process according to the groove conditions and plate thickness:

[0018] 3.1) The welding of double-sided symmetrical grooves is divided into the following two cases: a) and b)

[0019] a) 20mm<δ S ≤50mm

[0020] Carry out inner welding first. When the welding thickness reaches 5mm, use inner and outer sample plates to measure the weld angle E. When the measured weld angle E is between 1.5 and 2mm, stop inner welding.

[0021] After stopping the inner welding, gouge the outer edge and then start the outer welding. When the welding thickness reaches 5mm, use the inner and outer sample plates to measure the weld angle E. When the measured weld angle E is between 1 and 1.5mm, stop the outer welding.

[0022] After stopping the outer mouth welding, start double-sided welding by two people. When the welding thickness reaches two-thirds of the groove depth, stop double-sided welding by two people. Use inner and outer sample plates 1 to measure the weld angle E. When the measured weld angle E is between 1 and 1.5 mm, continue double-sided welding by two people until the welding is completed. When the measured weld angle E is less than 1 mm, complete the inner mouth welding first, and then complete the outer mouth welding. When the measured weld angle E is greater than 1.5 mm, complete the outer mouth welding first, and then complete the inner mouth welding.

[0023] b)δ S >50mm

[0024] Carry out inner welding first. When the welding thickness reaches 5mm, use inner and outer sample plates to measure the weld angle E. When the measured weld angle E is between 2.5 and 3mm, stop inner welding.

[0025] After stopping the inner welding, gouge the outer edge and then start the outer welding. When the welding thickness reaches 5mm, use the inner and outer sample plates to measure the weld angle E. When the measured weld angle E is between 2 and 2.5mm, stop the outer welding.

[0026] After stopping the outer mouth welding, start double-sided welding by two people. When the welding thickness reaches two-thirds of the groove depth, stop double-sided welding by two people. Use inner and outer sample plates 1 to measure the weld angle E. When the measured weld angle E is between 2 and 2.5 mm, continue double-sided welding by two people until the welding is completed. When the measured weld angle E is less than 2 mm, complete the inner mouth welding first, and then complete the outer mouth welding. When the measured weld angle E is greater than 2.5 mm, complete the outer mouth welding first, and then complete the inner mouth welding.

[0027] 3.2) The welding of the butt joint with large inner groove and small outer groove is divided into the following two cases c) and d):

[0028] c) 20mm<δ S ≤50mm

[0029] Carry out inner welding first. When the welding thickness reaches 5mm, use inner and outer sample plates to measure the weld angle E. When the measured weld angle E is between 1 and 1.5mm, stop inner welding.

[0030] After stopping the inner welding, gouge the outer edge and then start the outer welding. When the welding thickness reaches 5mm, use the inner and outer sample plates to measure the weld angle E. When the measured weld angle E is between 0.5 and 1mm, stop the outer welding.

[0031] After stopping the outer mouth welding, start double-sided welding by two people. When the welding thickness reaches two-thirds of the groove depth, stop double-sided welding by two people. Use inner and outer sample plates 1 to measure the weld angle E. When the measured weld angle E is between 0.5 and 1 mm, continue double-sided welding by two people until the welding is completed. When the measured weld angle E is less than 0.5 mm, complete the inner mouth welding first, and then the outer mouth welding. When the measured weld angle E is greater than 1 mm, complete the outer mouth welding first, and then the inner mouth welding.

[0032] d)δ S >50mm

[0033] Carry out inner welding first. When the welding thickness reaches 5mm, use inner and outer sample plates to measure the weld angle E. When the measured weld angle E is between 2 and 2.5mm, stop inner welding.

[0034] After stopping the inner welding, gouge the outer edge and then start the outer welding. When the welding thickness reaches 5mm, use the inner and outer sample plates to measure the weld angle E. When the measured weld angle E is between 1.5 and 2mm, stop the outer welding.

[0035] After stopping the outer mouth welding, start double-sided welding by two people. When the welding thickness reaches two-thirds of the groove depth, stop double-sided welding by two people. Use inner and outer sample plates 1 to measure the weld angle E. When the measured weld angle E is between 1.5 and 2 mm, continue double-sided welding by two people until the welding is completed. When the measured weld angle E is less than 1.5 mm, complete the inner mouth welding first, then the outer mouth welding. When the measured weld angle E is greater than 2 mm, complete the outer mouth welding first, then the inner mouth welding.

[0036] 3.3) The welding of the butt joints with small inner groove and large outer groove can be divided into the following two cases: e) and f):

[0037] e) 20mm<δ S ≤50mm

[0038] First, weld the outer opening. When the welding thickness reaches 5mm, use the inner and outer sample plates to measure the weld angle E. When the measured weld angle E is between 1.5 and 2mm, stop welding the outer opening.

[0039] After stopping the outer mouth welding, gouge the inner mouth to clean the root, then start the inner mouth welding. When the welding thickness reaches 5mm, use the inner and outer sample plates to measure the weld angle E. When the measured weld angle E is between 2 and 2.5mm, stop the inner mouth welding.

[0040] After stopping the inner mouth welding, start double-sided welding by two people. When the welding thickness reaches two-thirds of the groove depth, stop double-sided welding by two people. Use inner and outer sample plates 1 to measure the weld angle E. When the measured weld angle E is between 2 and 2.5 mm, continue double-sided welding by two people until the welding is completed. When the measured weld angle E is less than 2 mm, complete the inner mouth welding first, and then the outer mouth welding. When the measured weld angle E is greater than 2.5 mm, complete the outer mouth welding first, and then the inner mouth welding.

[0041] f)δ S >50mm

[0042] First, perform outer welding. When the welding thickness reaches 5mm, use inner and outer sample plates 1 to measure the weld angle E. When the measured weld angle E is between 2 and 2.5mm, stop outer welding.

[0043] After stopping the outer mouth welding, gouge the inner mouth to clean the root, then start the inner mouth welding. When the welding thickness reaches 5mm, use the inner and outer sample plates to measure the weld angle E. When the measured weld angle E is between 2.5 and 3mm, stop the inner mouth welding.

[0044] After stopping the inner mouth welding, start double-sided welding by two people. When the welding thickness reaches two-thirds of the groove depth, stop double-sided welding by two people. Use inner and outer sample plates 1 to measure the weld angle E. When the measured weld angle E is between 2.5 and 3 mm, continue double-sided welding by two people until the welding is completed. When the measured weld angle E is less than 2.5 mm, complete the inner mouth welding first, then the outer mouth welding. When the measured weld angle E is greater than 3 mm, complete the outer mouth welding first, then the inner mouth welding.

[0045] 4) After completing the butt welding, use the inner and outer sample plates to measure the final weld angle E at the weld joint. The final weld angle E is required to meet the requirements in 1.2), that is, when 20mm < δ S ≤50mm, E≤3mm; when δ S When >50mm, E≤1 / 16δ S , and E≤10mm.

[0046] Preferably, in 1.2), technical preparation:

[0047] The gap between the groups should be ≤0.5mm;

[0048] Welding seam angle requirements: When 20mm<δS ≤50mm, E≤2mm; when δ S When >50mm, E≤1 / 16δ S , and E≤3mm;

[0049] In step 4), the final weld angle E is required to meet the following requirements: when 20mm<δ S ≤50mm, E≤2mm; when δ S When >50mm, E≤1 / 16δ S , and E≤3mm.

[0050] Preferably, in 1.3), the curvature is required to be ≤1.5 mm, the angle deviation is required to be ≤±1.5°, and the depth deviation is required to be ≤±0.5 mm.

[0051] Compared with the prior art, the present invention has the following advantages: The method for controlling the sharp angles of a longitudinal butt weld of a cylinder is simple to operate. It accepts the inherent deformation of the cylinder being welded during the welding process without requiring any other measures or incurring additional costs. It utilizes the deformation and reverse deformation of the cylinder being welded during the welding process. Based on the diameter, plate thickness, groove distribution, and size of the cylinder being welded, the method achieves the purpose of controlling the sharp angles of the weld by presetting the sharp angles and adopting an alternating inside-outside and two-person, two-sided welding process. This effectively ensures welding quality and significantly reduces the cost of controlling the sharp angles of the longitudinal butt weld of the cylinder and the manufacturing cost of the cylinder. The control method of the present invention is particularly suitable for controlling the sharp angles of welds of cylindrical weld joints with a thickness greater than 20 mm and a double-sided groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 Flowchart of the method for controlling the angle of the longitudinal butt weld of a cylinder in an embodiment. DETAILED DESCRIPTION

[0053] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0054] In order to specifically demonstrate the characteristics and advantages of the present invention, the embodiment selected in the present invention is a i For a 2800mm cylinder, the plate thickness δ S The diameter of the cylinder is 48mm. There is a longitudinal weld on the cylinder with a double-sided symmetrical groove. E represents the weld angle, and E' represents the assembly angle.

[0055] The flow chart of the method for controlling the edge angle of the longitudinal butt weld of the cylinder in this embodiment is as follows: Figure 1 As shown, the control method includes the following steps:

[0056] 1) Welding preparation

[0057] 1.1) Tool Preparation: Prepare an inner template for measuring the curvature of the rolled sheet, with a chord length of 1000mm. Prepare inner and outer templates 1 and 1 for measuring weld angles, with a chord length of 500mm each. Also prepare welding gauges, assembly fixtures, and welding equipment.

[0058] 1.2) Technical Preparation

[0059] The gap between the groups should be ≤0.5mm;

[0060] Welding seam angle requirements: E≤2mm;

[0061] 1.3) Plate inspection

[0062] After rolling the sheet, use the inner template to measure the curvature of the sheet, which is required to be ≤1.5mm; use the welding gauge to measure the angle of the bevel on the sheet, which is required to have an angle deviation of ≤±1.5°, and measure the depth of the bevel, which is required to have a depth deviation of ≤±0.5mm; if the curvature, angle deviation or depth deviation does not meet the above requirements, the sheet will be repaired until it is qualified;

[0063] 2) Determination of technical requirements for longitudinal seam assembly of cylinder

[0064] The gap between the groups should be less than or equal to 0.5mm.

[0065] Corner pair: In this embodiment, the groove is a double-sided symmetrical groove, and the plate thickness δ S The thickness of the steel sheet is 48mm, and the requirements for the edges and corners are as follows: E'≤1.5mm;

[0066] 3) Perform group seam welding. The welding process is as follows:

[0067] Carry out inner welding first. When the welding thickness reaches 5mm, use inner and outer sample plates to measure the weld angle E. When the measured weld angle E is 1.5mm, stop inner welding.

[0068] After stopping the inner welding, gouge the outer edge and then start the outer welding. When the welding thickness reaches 5mm, use the inner and outer sample plates to measure the weld angle E. When the measured weld angle E is within 1mm, stop the outer welding.

[0069] After stopping the outer mouth welding, start double-sided welding by two people. When the welding thickness reaches two-thirds of the groove depth (i.e. 16mm), stop double-sided welding by two people. Use the inner and outer sample plates to measure the weld angle E. When the measured weld angle E is within 1mm, continue double-sided welding by two people until the welding is completed. When the measured weld angle E is less than 1mm, complete the inner mouth welding first, and then complete the outer mouth welding. When the measured weld angle E is greater than 1.5mm, complete the outer mouth welding first, and then complete the inner mouth welding.

[0070] 4) After completing the group seam welding, use the inner sample 1 and the outer sample 1 to measure the final weld angle E at the weld joint. The final weld angle E is required to meet the requirements in 1.2), that is: E≤2mm.

Claims

1. A method for controlling the angularity of a longitudinal butt weld of a cylinder, characterized in that: In this control method, D i represents the inner diameter of the cylinder, E represents the weld angle, E' represents the pair angle, δ S Indicates the thickness of the plate. The control method includes the following steps: 1) Welding preparation 1.1) Tool preparation: Make an inner template for measuring the curvature of the rolled sheet. The chord length of the inner template should not be less than D i / 6 and not less than 1000mm; make one inner sample and one outer sample for measuring the weld corners, and the chord length of the inner sample and the outer sample shall not be less than D i / 6 and not less than 300mm; and prepare welding gauges, assembly fixtures, and welding equipment; 1.2) Technical Preparation The gap between the groups should be less than 1mm; Welding seam angle requirements: When 20mm<δ S ≤50mm, E≤3mm; when δ S When >50mm, E≤1 / 16δ S , and E≤10mm; 1.3) Plate inspection After rolling the sheet, use the inner template to measure the curvature of the sheet, which is required to be ≤2mm; use the welding gauge to measure the angle of the bevel on the sheet, which is required to have an angle deviation of ≤±2.5°, and measure the depth of the bevel, which is required to have a depth deviation of ≤±1mm; if the curvature, angle deviation or depth deviation does not meet the above requirements, the sheet will be repaired until it is qualified; 2) Determination of technical requirements for longitudinal seam assembly of cylinder Corner alignment: According to the distribution and size of the groove on the inner and outer sides of the welded joint, the groove is divided into three types: double-sided symmetrical groove, inner large groove and outer small groove, inner small groove and outer large groove. Depending on the thickness of the plate, the requirements for corner alignment are as follows: Double-sided symmetrical groove: 20mm<δ S When ≤50mm, E'≤1.5mm; δ S >50mm, E'≤2.5mm; Larger inside and smaller outside bevel: 20mm<δ S When ≤50mm, E'≥0.5mm; δ S >50mm, E'≥1mm; Small inside and large outside groove: 20mm<δ S When ≤50mm, E'≤2.5mm; δ S >50mm, E'≤3.5mm; 3) Perform group seam welding and select the corresponding welding process according to the groove conditions and plate thickness: 3.1) The welding of double-sided symmetrical grooves is divided into the following two cases: a) and b) a) 20mm<δ S ≤50mm Carry out inner welding first. When the welding thickness reaches 5mm, use inner and outer sample plates to measure the weld angle E. When the measured weld angle E is between 1.5 and 2mm, stop inner welding. After stopping the inner welding, gouge the outer edge and then start the outer welding. When the welding thickness reaches 5mm, use the inner and outer sample plates to measure the weld angle E. When the measured weld angle E is between 1 and 1.5mm, stop the outer welding. After stopping the outer mouth welding, start double-sided welding by two people. When the welding thickness reaches two-thirds of the groove depth, stop double-sided welding by two people. Use inner and outer sample plates 1 to measure the weld angle E. When the measured weld angle E is between 1 and 1.5 mm, continue double-sided welding by two people until the welding is completed. When the measured weld angle E is less than 1 mm, complete the inner mouth welding first, and then complete the outer mouth welding. When the measured weld angle E is greater than 1.5 mm, complete the outer mouth welding first, and then complete the inner mouth welding. b)δ S >50mm Carry out inner welding first. When the welding thickness reaches 5mm, use inner and outer sample plates to measure the weld angle E. When the measured weld angle E is between 2.5 and 3mm, stop inner welding. After stopping the inner welding, gouge the outer edge and then start the outer welding. When the welding thickness reaches 5mm, use the inner and outer sample plates to measure the weld angle E. When the measured weld angle E is between 2 and 2.5mm, stop the outer welding. After stopping the outer mouth welding, start double-sided welding by two people. When the welding thickness reaches two-thirds of the groove depth, stop double-sided welding by two people. Use inner and outer sample plates 1 to measure the weld angle E. When the measured weld angle E is between 2 and 2.5 mm, continue double-sided welding by two people until the welding is completed. When the measured weld angle E is less than 2 mm, complete the inner mouth welding first, and then complete the outer mouth welding. When the measured weld angle E is greater than 2.5 mm, complete the outer mouth welding first, and then complete the inner mouth welding. 3.2) The welding of the butt joint with large inner groove and small outer groove is divided into the following two cases c) and d): c) 20mm<δ S ≤50mm Carry out inner welding first. When the welding thickness reaches 5mm, use inner and outer sample plates to measure the weld angle E. When the measured weld angle E is between 1 and 1.5mm, stop inner welding. After stopping the inner welding, gouge the outer edge and then start the outer welding. When the welding thickness reaches 5mm, use the inner and outer sample plates to measure the weld angle E. When the measured weld angle E is between 0.5 and 1mm, stop the outer welding. After stopping the outer mouth welding, start double-sided welding by two people. When the welding thickness reaches two-thirds of the groove depth, stop double-sided welding by two people. Use inner and outer sample plates 1 to measure the weld angle E. When the measured weld angle E is between 0.5 and 1 mm, continue double-sided welding by two people until the welding is completed. When the measured weld angle E is less than 0.5 mm, complete the inner mouth welding first, and then the outer mouth welding. When the measured weld angle E is greater than 1 mm, complete the outer mouth welding first, and then the inner mouth welding. d)δ S >50mm Carry out inner welding first. When the welding thickness reaches 5mm, use inner and outer sample plates to measure the weld angle E. When the measured weld angle E is between 2 and 2.5mm, stop inner welding. After stopping the inner welding, gouge the outer edge and then start the outer welding. When the welding thickness reaches 5mm, use the inner and outer sample plates to measure the weld angle E. When the measured weld angle E is between 1.5 and 2mm, stop the outer welding. After stopping the outer mouth welding, start double-sided welding by two people. When the welding thickness reaches two-thirds of the groove depth, stop double-sided welding by two people. Use inner and outer sample plates 1 to measure the weld angle E. When the measured weld angle E is between 1.5 and 2 mm, continue double-sided welding by two people until the welding is completed. When the measured weld angle E is less than 1.5 mm, complete the inner mouth welding first, then the outer mouth welding. When the measured weld angle E is greater than 2 mm, complete the outer mouth welding first, then the inner mouth welding. 3.3) The welding of the butt joints with small inner groove and large outer groove can be divided into the following two cases: e) and f): e) 20mm<δ S ≤50mm First, perform outer welding. When the welding thickness reaches 5mm, use inner and outer sample plates to measure the weld angle E. When the measured weld angle E is between 1.5 and 2mm, stop outer welding. After stopping the outer mouth welding, gouge the inner mouth to clean the root, then start the inner mouth welding. When the welding thickness reaches 5mm, use the inner and outer sample plates to measure the weld angle E. When the measured weld angle E is between 2 and 2.5mm, stop the inner mouth welding. After stopping the inner mouth welding, start double-sided welding by two people. When the welding thickness reaches two-thirds of the groove depth, stop double-sided welding by two people. Use inner and outer sample plates 1 to measure the weld angle E. When the measured weld angle E is between 2 and 2.5 mm, continue double-sided welding by two people until the welding is completed. When the measured weld angle E is less than 2 mm, complete the inner mouth welding first, and then the outer mouth welding. When the measured weld angle E is greater than 2.5 mm, complete the outer mouth welding first, and then the inner mouth welding. f)δ S >50mm First, perform outer welding. When the welding thickness reaches 5mm, use inner and outer sample plates 1 to measure the weld angle E. When the measured weld angle E is between 2 and 2.5mm, stop outer welding. After stopping the outer mouth welding, gouge the inner mouth to clean the root, then start the inner mouth welding. When the welding thickness reaches 5mm, use the inner and outer sample plates to measure the weld angle E. When the measured weld angle E is between 2.5 and 3mm, stop the inner mouth welding. After stopping the inner mouth welding, start double-sided welding by two people. When the welding thickness reaches two-thirds of the groove depth, stop double-sided welding by two people. Use inner and outer sample plates 1 to measure the weld angle E. When the measured weld angle E is between 2.5 and 3 mm, continue double-sided welding by two people until the welding is completed. When the measured weld angle E is less than 2.5 mm, complete the inner mouth welding first, then the outer mouth welding. When the measured weld angle E is greater than 3 mm, complete the outer mouth welding first, then the inner mouth welding. 4) After completing the butt welding, use the inner and outer sample plates to measure the final weld angle E at the weld joint. The final weld angle E is required to meet the requirements in 1.2), that is, when 20mm < δ S ≤50mm, E≤3mm; when δ S When >50mm, E≤1 / 16δ S , and E≤10mm.

2. The method for controlling the edge angle of the longitudinal butt weld of a cylinder according to claim 1, characterized in that: 1.2) Technical preparation: The gap between the groups should be ≤0.5mm; Welding seam angle requirements: When 20mm<δ S ≤50mm, E≤2mm; when δ S When >50mm, E≤1 / 16δ S , and E≤3mm; In step 4), the final weld angle E is required to meet the following requirements: when 20mm<δ S ≤50mm, E≤2mm; when δ S When >50mm, E≤1 / 16δ S , and E≤3mm.

3. The method for controlling the edge angle of the longitudinal butt weld of a cylinder according to claim 1, characterized in that: 1.3), the curvature is required to be ≤1.5mm, the angle deviation is required to be ≤±1.5°, and the depth deviation is required to be ≤±0.5mm.

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