Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K9/00—Arc welding or cutting
  • B23K9/02—Seam welding; Backing means; Inserts
  • B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
  • B23K9/0282—Seam welding; Backing means; Inserts for curved planar seams for welding tube sections
  • B23K9/0284—Seam welding; Backing means; Inserts for curved planar seams for welding tube sections with an electrode working inside the tube
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
  • B23K31/003—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to controlling of welding distortion

Definitions

• the invention relates to a deformation control method for inserting a large inclined pipe and a chemical cylinder, and belongs to the technical field of welding. Background technique
• the welded joint structure of the plug-in large inclined tube 11 and the gas return chamber cylinder 12 is as shown in Fig. 1.
• the thickness of the joint weld is large, and the welding work is extremely large.
• the upper pot patent "insertion joint and barrel non-orthogonal intersecting joint welding method" (patent number: CN200610024861.9), using saddle-shaped submerged arc automatic welding, flat welding
• the method of positional and segmental welding welds the large inclined pipe and the gas returning chamber cylinder, which greatly improves the welding production efficiency, shortens the manufacturing cycle, and the welding quality is effectively guaranteed, thereby avoiding the difficulty of repairing such joint welds. , got a good result.
• the inserted large inclined pipe and the gas returning chamber cylinder welded joint have large welding time and long welding period, and the product structure has high requirements on the dimensional accuracy between the two. Therefore, how to control the welded joint of the same type Deformation is a very big problem. For such large joints, once the welding deformation exceeds the standard requirements, it will be difficult to correct them by an effective method, and the results will be catastrophic.
• the upper pot patent "insertion joint and barrel non-orthogonal intersecting joint welding method” the method of preventing the welding deformation by uniformly arranging the rigid fixed ribs in the circumferential direction of the outer root of the welded joint has achieved certain effects, but this is adopted. The effect achieved by the method is uncertain.
• the invention utilizes a measuring device to monitor the deformation amount of the joint in real time, and combines with the rigid fixing method to take measures to adjust the welding deformation amount according to the measured data. Summary of the invention
• the object of the present invention is to provide a method for controlling the welding deformation of a plug-in large inclined pipe and a large chemical cylinder joint, and using a full-station electronic speed measuring instrument to insert during the welding process of the inserted large inclined pipe and the chemical cylinder.
• the deformation amount of the joint of the large inclined pipe and the chemical cylinder is measured, and the welding sequence and the process are adjusted according to the measurement data in time to control the welding deformation of the joint to meet the product size requirement.
• the present invention provides a welding of a plug-in large inclined pipe and a cylinder joint.
• a deformation control method comprising the following specific steps:
• Step 1 Using a gas cutting method to open a hole in the crotch of the cylinder;
• Step 2 Assembling the inserted large inclined pipe and the cylinder, and uniformly arranging the anti-deformation rigid fixed ribs in the outer circumference of the joint and welding them;
• Step 3 Measure the joint size of the cylinder and the large inclined tube by using a full-station electronic speedometer by placing the measuring points on the cylindrical body and the inserted large inclined tube, and put the ⁇ -angle anti-deformation margin, the ⁇ The angle is the angle between the axial centerline of the cylinder and the axial centerline of the large inclined pipe;
• Step 4 Using a saddle welder to weld the inserted large inclined pipe and the lower weld of the cylinder until the welding is two;
• Step 5 Weld the inserted large inclined pipe and the middle and lower welds of the cylinder.
• the angle ⁇ is measured by a full-station electronic speed measuring instrument.
• ⁇ is the angle between the axial centerline of the large inclined pipe and the center line of the joint of the cylinder.
• the control angle ⁇ is maintained at 180. ;
• Step 6 Move the welding platform up and weld the middle and upper welds of the inserted large inclined pipe and the cylinder; measure the angle with a full-station electronic speedometer through the measuring points arranged on the cylinder and the inserted large inclined pipe ⁇ , during the welding process, the control angle ⁇ is maintained at 180°;
• Step 7 Move the welding platform up and weld the upper weld.
• the angle ⁇ of the angle between the large inclined pipe and the cylinder becomes smaller.
• the trend of the direction change the deformation margin is pre-released during assembly.
• the ⁇ -angle inverse deformation margin is greater than 0° and less than or equal to 0.5 °.
• step 4 and step 5 the step of controlling the angle ⁇ to be maintained at 180° is specifically as follows: if the angle ⁇ is offset in the positive direction, the method for controlling the welding deformation of the plug-in large inclined tube and the barrel joint is as follows: If it is moved, the welding will be stopped in the same direction. Only the weld with the opposite direction of the offset will be welded. After the measurement, the offset angle will return to the tolerance allowable range. If the angle ⁇ is reversed, the angle is reversed. on the contrary.
• the technical scheme of the invention utilizes a full-station type electronic speed measuring instrument, combined with a rigid fixed method, in the saddle-shaped submerged arc automatic welding process of the inserted large inclined tube and the cylinder body, the deformation amount of the joint is performed. Measure and adjust the welding sequence and process according to the measurement data in time, control the welding deformation of the joint, the product qualification rate is high, the welding quality is effectively guaranteed, can meet the product size requirements, the method is simple, and the welding of such large plug-in joints is controlled. The deformation has a very good effect.
• Figure 1 is a schematic view of a conventional plug-in large inclined tube and a barrel welded structure.
• FIG. 2 is a schematic view showing the welding deformation control of the inserted large inclined pipe and the cylinder according to the present invention.
• Figure 3 is a schematic view of the A direction of Figure 2 of the present invention. Specific form
• IGCC gas return chamber plug-in nozzle 21 Dimensions: Inner diameter 1620mm, wall thickness 280mm; Cylinder 22 size: Inner diameter 4400mm, wall thickness 230mm.
• the welded joint between the insert type inclined tube 21 and the barrel 22 is controlled by the method described in the patent CN200610024861.9, and the joint deformation is controlled during the welding process.
• the main steps are as follows:
• Step 1 Open the hole in the cylinder 22 by gas cutting.
• Step 2 As shown in Fig. 2, the inserted large inclined tube 21 and the barrel 22 are assembled, and the anti-deformation rigid fixing rib 23 is evenly arranged in the circumferential direction of the joint and welded.
• Step 3 By measuring the measuring points 27 arranged on the cylinder 22 and the plug-in large inclined tube 21, the joint size is measured by the full-station type electronic speed measuring device 26, and the ⁇ -angle inverse deformation margin is 0.08°, that is, the actual ⁇
• the angle ⁇ is 45.08 °, which is the angle between the axial centerline of the cylinder and the axial centerline of the large inclined pipe.
• Step 4 Using a saddle-shaped welder 24 (the welder is hoisted into the inside of the cylinder by a crane, and fixed to the inner wall of the large inclined pipe by a supporting steel pipe), and the weld-inserted large inclined pipe 21 and the lower portion of the cylinder 22 are welded. Until the weld is full, move the welder and platform 25 up.
• Step 5 Weld the insert-type large inclined tube 21 and the middle-lower weld of the cylinder 22.
• the angle ⁇ between the large inclined tube and the cylindrical body shown in the ⁇ diagram of Fig. 3 is measured by the total station type electronic speedometer 26 by the measuring points 27 laid on the cylindrical body 22 and the plug-in large inclined tube 21.
• the angle ⁇ is the angle between the axial centerline of the large inclined pipe and the center line at the joint of the cylinder, as shown in Fig. 3. More than five measuring points are arranged on the cylinder 22 and the large inclined tube 21, wherein three measuring points are uniformly distributed on the same circumferential plane, and the measuring points are distributed in the cylinder The rest of the body.
• the function of the measuring point layout is to simulate the shape of the cylinder and the large inclined tube by the total station calculation through the point data, so as to find the angle ⁇ between the cylinder and the large inclined tube. Analyze the angle direction and take corresponding measures to control the angle ⁇ to maintain 180°: If the angle ⁇ is offset in the positive direction, stop the welding in the same direction as the middle and lower welds, only weld the middle and lower parts opposite to the offset direction. After the weld is welded, the offset angle returns to within ⁇ 0.1 ° of the tolerance; if ⁇ is offset in the opposite direction, the opposite is true.
• Step 6 Move the welding platform 25 up and weld the insert-type large inclined pipe 21 and the upper middle weld of the cylinder 22.
• the angle ⁇ between the large inclined tube 21 and the barrel 22 is measured by a total station type electronic speed measuring device 26 by a measuring point 27 disposed on the barrel 22 and the plug-in large inclined tube 21, as shown in Fig. 3. Analyze the angular direction and take measures to control the angle ⁇ to maintain 180°. The measures are the same as described in step 5.
• Step 7 Move the welding platform 25 up and weld to complete the upper weld.
• the welding work of the inserted large inclined pipe and the large-sized chemical cylinder body was successfully completed, and the ultrasonic flaw detection after welding was once qualified.
• the joint size is measured by a full-station electronic speedometer with an ⁇ -angle offset of 0.02° and a ⁇ -angle offset of 0.04°, which fully meets the dimensional requirements of the drawing.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Plasma & Fusion (AREA)
• Butt Welding And Welding Of Specific Article (AREA)

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• 2011
  • 2011-03-30 CN CN2011100774668A patent/CN102380690A/zh active Pending
• 2012
  • 2012-02-16 PL PL403055A patent/PL223908B1/pl unknown
  • 2012-02-16 WO PCT/CN2012/071233 patent/WO2012129995A1/zh active Application Filing

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