CN109693020B - Method and tool for controlling welding deformation of connecting pipe and cylinder with internal diameter Di smaller than 600mm - Google Patents

Method and tool for controlling welding deformation of connecting pipe and cylinder with internal diameter Di smaller than 600mm Download PDF

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Publication number
CN109693020B
CN109693020B CN201811638791.5A CN201811638791A CN109693020B CN 109693020 B CN109693020 B CN 109693020B CN 201811638791 A CN201811638791 A CN 201811638791A CN 109693020 B CN109693020 B CN 109693020B
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welding
connecting pipe
cylinder
wall
deformation
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CN109693020A (en
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赵治军
廖国平
于疆
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Dongfang Boiler Group Co Ltd
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Dongfang Boiler Group Co Ltd
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    • 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
    • B23K9/16—Arc welding or cutting making use of shielding gas
    • B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
    • 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
    • B23K9/32—Accessories

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  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Arc Welding In General (AREA)

Abstract

The invention discloses an anti-deformation tool for a connecting pipe and a thin-wall cylinder with the inner diameter Di less than 600mm, which comprises a round bar, an inner supporting cylinder, an inner supporting plate and a J-shaped plate, wherein the inner supporting cylinder and the inner supporting plate are sleeved on the round bar, the inner supporting plate tightly supports the inner wall of a welding slope of the cylinder after bearing a vertically applied external force, the inner supporting cylinder forms radial support for the inner wall of the welding slope, the J-shaped plate is symmetrically connected to the round bar, the edge of a flange of the connecting pipe is placed in a concave position of the J-shaped plate, the opening size L of the flange surfaces of the two connecting pipes is ensured to be the tolerance upper limit, and therefore the axial constraint of the welding line of the connecting pipe and the cylinder is ensured to be consistent.

Description

Method and tool for controlling welding deformation of connecting pipe and cylinder with internal diameter Di smaller than 600mm
Technical Field
The invention relates to the technical field of welding, in particular to the technical field of welding of a connecting pipe and a thin-wall barrel.
Background
The control of welding collapse deformation of the connecting pipe and the cylinder is always a technical problem in the field of heat exchanger and pressure vessel manufacturing. And once the connection pipe and the cylinder body are welded and then deformed out of tolerance and cannot meet the requirement through correction, inconvenience is brought to the aspects of field interface installation and the like, and even product scrapping is caused in severe cases.
At present, in order to control the welding deformation, when the inner diameter D of the cylinder bodyiWhen the thickness is more than or equal to 600mm, the welding deformation of the connecting pipe is controlled by generally adopting a mode of opening an inner groove of the connecting pipe hole and installing a welding hoop at the outer side of the cylinder body or installing a welding support at the inner side of the cylinder body, but when the welding seam of the deformation-preventing temporary accessory is removed, the wall thickness of the cylinder body is easily reduced and out of tolerance; when the inner diameter D of the cylinder bodyiWhen the thickness of the connecting pipe is less than 600mm, the welding deformation of the connecting pipe is controlled by adopting a mode of opening an outer groove of the connecting pipe hole and installing a support on the inner side of the cylinder body, and the existing inner side support generally adopts a structure of additionally installing a support plate on a support rod during welding, so that the inner side support cannot directly support the connecting pipe, the connecting pipe is in a free state and is not effectively restrained, and the deformation control effect is poor.
When the cylinder and the connecting pipe are made of austenitic stainless steel, the welding deformation control difficulty is higher, and the requirement of argon protection on the back side is always considered; once deformation is out of tolerance, correction is extremely difficult, and the temperature must be controlled below 425 ℃ during thermal correction, otherwise, the sensitization and intercrystalline corrosion resistance of stainless steel are reduced, and ideal effects are difficult to obtain; when a hydraulic jack or an oil press is used for cold calibration, the cylinder body can generate local bulge or inner side whole circle depression.
When the cylinder body of the water chamber of the small heat exchanger (namely the inner diameter D of the cylinder body)iLess than 600mm, wall thickness delta less than or equal to 12mm) is symmetrically provided with a flanged connection pipe, the following welding deformations generally occur: 1. elliptical deformation: the diameter of flange changes, along the axial flange diameter grow of stack shell, diminishes along stack shell hoop flange diameter, and the flange becomes the ellipse. 2. Angular deformation: the flange becomes butterfly shape as a whole. The deformation is related to the welding groove form, the center of the flange welded by the inner groove is inwards concave, and the center of the flange welded by the outer groove is upwards convex. 3. Saddle-shaped deformation: the flange plane becomes a cambered surface. 4. Integral collapse: the flange is wholly collapsed towards the inner part of the cylinder body, and the elevation of the welded plane of the flange is lower than that of the welded plane. The above four deformations are not independent, and the deformation of the insert flange is formed by superposing and combining the four basic deformations. With the change of different influencing factors, certain deformation is stronger, and other deformation is weaker.
The above flange welding deformation may cause the following hazards: 1. the flange surface is uneven, the flange loses the sealing performance, and the product cannot be subjected to a hydrostatic test and cannot be installed and operated; 2. the flange surface is wholly collapsed, so that the mounting position and the mounting size of an external connecting pipeline deviate from the original design requirements, and in order to ensure the design requirements, external connecting parts connected with the flange need to be independently processed according to actual conditions, so that great loss is caused to users.
In order to solve the problems, the applicant utilizes the structural characteristics that the connecting pipes with flanges are symmetrically arranged on the cylinder body of the water chamber of the small heat exchanger, and innovatively improves the aspects of the design, assembly and welding process control of the anti-deformation tool, so that the collapse and deformation of the cylinder body are effectively controlled, and the condition needing to be corrected is avoided.
Disclosure of Invention
The invention aims to provide a method and a tool for effectively controlling the collapse and deformation of a thin-wall cylinder.
The technical scheme adopted by the invention is as follows: the anti-deformation tool for the connecting pipe and the thin-wall cylinder with the inner diameter Di less than 600mm comprises a round rod, wherein the round rod is used for penetrating through a welding groove of the connecting pipe and the cylinder and extending out of the end part of the connecting pipe and can form radial support for the inner wall of the connecting pipe;
the inner supporting cylinder is arranged on the inner wall of the welding groove of the cylinder body during welding and sleeved on the round rod, and forms reverse deformation on the inner wall of the cylinder body at the welding groove, so that the welding deformation of the connecting pipe is reduced;
the inner supporting plate is arranged at one end, far away from the inner wall of the barrel body, of the inner supporting barrel during welding and sleeved on the round rod, the inner supporting barrel is tightly propped against the inner wall of the welding groove of the barrel body after the inner supporting plate bears a vertically applied external force, and the inner supporting barrel forms radial support for the inner wall of the welding groove;
j-shaped plate, J-shaped plate symmetric connection are on the pole, and the edge of flange of connecting pipe is placed to its indent, and the medial surface of flange of connecting pipe is hugged closely to the medial surface of J-shaped plate and flange of connecting pipe contact's one side perpendicular to pole in the J-shaped plate, and the relative position of takeover and barrel on vertical is injectd to the J-shaped plate to guarantee that two flange face of connecting pipe open crotch size L are the tolerance upper limit, guarantee that the welding seam axial that takeover and barrel receives the restraint unanimously.
Furthermore, the round bar is made of round steel, so that certain rigidity of the round bar is guaranteed, and the J-shaped plate and the connecting pipe can be supported.
Furthermore, an external force is vertically applied to the inner supporting plate through a hydraulic jack, the misalignment between the end face of the connecting pipe and the inner wall of the cylinder body is controlled to be less than or equal to 0.5mm, and the size of the welded connecting pipe is ensured to meet the design requirement.
The control method of the welding collapse deformation of the connecting pipe and the thin-wall cylinder with the inner diameter Di less than 600mm comprises the following steps:
(a) designing and manufacturing the deformation-preventing tool;
(b) assembling the connecting pipe and the cylinder body to be welded with the round rod, the J-shaped plate, the inner supporting cylinder and the inner supporting plate of the anti-deformation tool manufactured in the step (a), ensuring that the inner side surface of the J-shaped plate is tightly attached to the inner side surface of the connecting pipe flange of the connecting pipe, and ensuring that the crotch opening size L of the flange surfaces of the two connecting pipes is the tolerance upper limit;
(c) applying vertical pressure on the inner supporting plate assembled in the step (b) to ensure that the inner supporting cylinder can be tightly propped against the inner wall of the welding groove of the cylinder body to form reverse deformation on the welding groove, and reducing the welding deformation of the connecting pipe;
(d) welding the connecting pipes to the welding groove of the cylinder body, alternately welding the two connecting pipes layer by layer, and welding the flat welding position until the welding position is right;
(e) and (d) after the welding is finished in the step (d), dismantling the anti-deformation tool.
And (c) further, in the step (b), adjusting the opening crotch size L of the flange faces of the two connecting pipes according to the upper limit of the deviation tolerance when the J-shaped plate and the round rod are assembled, welding the J-shaped plate and the round rod after the adjustment is in place, alternately and symmetrically welding and monitoring the welding deformation at any time during welding, and ensuring that the J-shaped plate is attached to the inner side faces of the connecting pipes.
Furthermore, in the step (c), the inner supporting plates are pre-pressed tightly by a hydraulic jack, the misalignment between the end surface of the connecting pipe and the inner wall of the cylinder body is controlled to be less than or equal to 0.5mm, and the size of the welded connecting pipe is ensured to meet the design requirement.
Further, in the step (d), when the connecting pipe and the cylinder are made of austenitic stainless steel, each layer of welded pipe needs to be cooled within 1 minute, so that the welding stress is released in time, the reduction of the sensitization and intercrystalline corrosion resistance of the stainless steel is avoided, and the product quality is ensured.
Further, when welding protection is needed, before the step (d) is carried out, the port of the connecting pipe is closed, the assembling gap between the connecting pipe and the welding groove of the cylinder body is adjusted to be uniform, the welding groove is closed, the gas outlet is reserved at the same time, and then argon is introduced into the cylinder body until the cylinder body and the connecting pipe are filled with argon.
Further, in the step (d), after the connecting pipe and the cylinder are welded and the welding line is cooled to room temperature, the J-shaped plate is cut off from the round bar, so that the deformation-preventing tool is detached.
The invention has the beneficial effects that:
(1) the round bar and the J-shaped plate are utilized to simultaneously realize rigid constraint of the butt joint pipe and the barrel in the welding shrinkage direction so as to control welding deformation.
(2) The inner wall of the welding groove of the cylinder body is pre-installed with an inner supporting cylinder and an inner supporting plate to form reversible deformation, so that the welding deformation is controlled.
(3) When the cylinder and the connecting pipe are made of austenitic stainless steel, the cylinder and the connecting pipe are immediately cooled after welding, so that the welding stress is released in time, and the welding deformation is controlled.
Drawings
Fig. 1 is an assembly front view of the deformation prevention tool of the present invention.
Fig. 2 is a schematic view of the structure of the product obtained after the deformation control method of the present invention is used.
Fig. 3 is an assembled right side view of the deformation prevention tool of the present invention.
Labeled as: 1-connecting pipe, 2-connecting pipe flange, 3-barrel, 4-J-shaped plate, 5-internal support barrel, 6-internal support plate, 7-hydraulic jack, 8-round rod, 9-welding groove, 10-end socket, L-connecting pipe flange surface crotch size, d 1-gap between J-shaped plate and outer circle of connecting pipe flange, and d 2-distance between inner wall of internal support barrel and edge of welding groove of barrel.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The thin-wall cylinder body has an inner diameter DiLess than 600mm and with the wall thickness delta less than or equal to 12mm, as shown in figures 1 and 3, the anti-deformation tool comprises
The round rod 8 is used for penetrating through the welding bevel 9 of the connecting pipe 1 and the cylinder 3, extending out of the end part of the connecting pipe 1 and forming radial support for the inner wall of the connecting pipe 1, and the round rod 8 is generally made of round steel in order to ensure that the round rod 8 has enough rigidity to support the J-shaped plate 4 and the connecting pipe 1;
the inner supporting cylinder 5 is arranged on the inner wall of the welding groove 9 of the cylinder 3 during welding and sleeved on the round rod 8, and forms reverse deformation on the inner wall of the cylinder 3 at the welding groove 9, so that the welding deformation of the connecting pipe 1 is reduced;
the inner supporting plate 6 is arranged at one end, far away from the inner wall of the barrel body 3, of the inner supporting barrel 5 during welding and sleeved on the round bar 8, the inner supporting plate 6 tightly supports the inner wall of the welding groove 9 of the barrel body 3 after bearing a vertically applied external force, and the inner supporting barrel 5 radially supports the inner wall of the welding groove 9;
for the convenience of installation, can make an organic whole structure with interior a section of thick bamboo 5 and interior vaulting board 6, put at 6 central point of interior vaulting board and open the through-hole that has to supply pole 8 to pass, it is even to the application of force of barrel 3 in order to guarantee interior a section of thick bamboo 5, and the terminal surface of interior vaulting 5 and barrel 3 contact and the one side of interior vaulting board 6 and hydraulic jack 7 contact all will guarantee certain roughness.
Still include J-shaped plate 4, J-shaped plate 4 generally has two sets ofly, and every group has four, and two sets of J-shaped plate 4 are connected respectively at the both ends of pole 8, and the longer one side symmetry of J-shaped plate 4 is connected perpendicularly on pole 8, and the edge of flange 2 is placed to the interior concave part of J-shaped plate 4, hugs closely the medial surface of flange 2 in order to guarantee when placing J-shaped plate 4's medial surface, must guarantee the one side perpendicular to pole 8 of welded J-shaped plate 4 and flange 2 contacts of flange 2.
The invention also provides a method for controlling the welding collapse deformation of the connecting pipe 1 and the thin-wall cylinder 3 with the inner diameter Di less than 600mm, which comprises the following steps:
(a) designing and manufacturing the deformation-preventing tool;
(b) assembling the connecting pipe 1 and the cylinder 3 to be welded with the round rod 8, the J-shaped plate 4, the inner supporting cylinder 5 and the inner supporting plate 6 of the anti-deformation tool manufactured in the step (a), and ensuring that the inner side surface of the J-shaped plate 4 is tightly attached to the inner side surface of the connecting pipe flange 2 of the connecting pipe 1;
adjusting the crotch size L of the flange faces of the two connecting pipes according to the upper limit of the eccentric tolerance when assembling the J-shaped plate 4 and the round rod 8, welding the J-shaped plate 4 and the round rod 8 after adjusting in place, alternately and symmetrically welding during welding and monitoring the welding deformation at any time, and ensuring that the J-shaped plate 4 is tightly attached to the inner side faces of the flanges 2 of the connecting pipes.
(c) Applying vertical pressure on the inner supporting plate 6 assembled in the step (b) to ensure that the inner supporting cylinder 5 can be tightly jacked to the inner wall of the welding groove 9 of the cylinder body 3 to form reverse deformation on the welding groove 9, and reducing the welding deformation of the connecting pipe 1;
the inner supporting plates 6 are pre-tightly propped by a hydraulic jack 7, the misalignment between the end surface of the connecting pipe 1 and the inner wall of the cylinder 3 is controlled to be less than or equal to 0.5mm, and the dimension of the welded connecting pipe 1 is ensured to meet the design requirement.
If welding protection is needed, after the hydraulic jack 7 tightly pushes the inner supporting plate 6, the port of the connecting pipe 1 is closed, the assembling gap between the connecting pipe 1 and the welding groove 9 of the cylinder 3 is adjusted to be uniform, the welding groove 9 is closed, the air outlet is reserved at the same time, then argon is pre-introduced into the cylinder 3, and when the lighter is not fired at the air outlet, the air in the cylinder 3 and the connecting pipe 1 is exhausted and filled with argon.
(d) Welding the connecting pipes 1 to the welding groove 9 of the cylinder 3, alternately welding the two connecting pipes 1 layer by layer, and welding the flat welding positions until the welding positions are right;
when the connecting pipe 1 and the cylinder 3 are made of austenitic stainless steel, each layer of welded steel needs to be cooled within 1 minute, generally, clean white cloth is soaked in water and then is coated on a welding seam to realize water cooling, water can be sprayed to the white cloth in the cooling process, and the water quality meets the requirement of corresponding products on water pressure and water use.
(e) And (d) after the welding is finished in the step (d), dismantling the anti-deformation tool.
And after the connecting pipe 1 and the cylinder 3 are welded and the welding line is cooled to room temperature, cutting off the temporary welding line between the J-shaped plate 4 and the round bar 8 so as to remove the anti-deformation tool. Before dismantling the shape frock of preapring for an unfavorable turn of events, install the protection pad on the terminal surface of flange 2 of connecting pipe, then adopt the cutting grinding wheel piece to excise the interim welding seam of J-shaped plate 4 and round steel, the incision is as little as possible during the excision to 4 used repeatedly of J-shaped plate.
Example 1:
the application of the control method for welding collapse deformation of the connecting pipe 1 and the thin-wall cylinder 3 with the internal diameter Di smaller than 600mm is described by taking the welding of the connecting pipe 1 of the main pump sealing water heat exchanger in the domestic third-generation nuclear power pressurized water reactor nuclear island auxiliary system and the cylinder 3 of the water chamber as an example:
the main pump sealing water heat exchanger is used for cooling the leakage water from the reactor coolant pump shaft sealing water and the return water of the upper charge pump small-flow pipeline, and is a small U-shaped tubular heat exchanger with double tube passes and double shell passes. As shown in fig. 2, the water chamber of the heat exchanger is composed of a sealing head 10, a cylinder 3, a pipe connecting flange 2, a water chamber partition plate (not shown in the figure) and two pipe connecting flanges 2 which are symmetrically arranged at two sides of the water chamber partition plate, wherein the pipe connecting 1 and the cylinder 3 adopt an embedded welding structure.
The circumferential seams of the cylinder 3 and the end socket 10 and the pipe connecting flange 2 and the full-penetration fillet weld of the cylinder 3 and the pipe connecting 1 are subjected to 100% RT flaw detection. In order to meet the requirements of welding seam ray detection and workpiece size inspection, the whole welding and flaw detection sequence of the water chamber is as follows: the circular seam between the cylinder body 3 and the end socket 10 and the pipe connecting flange 2 → the circular seam RT flaw detection → the welding groove 9 on the cylinder body 3 → the welding pipe 1 at the welding groove 9 of the cylinder body 3 → the welding seam RT flaw detection between the connecting pipe 1 and the cylinder body 3 → the water welding chamber clapboard is arranged in the cylinder body 3.
After the barrel 3, the end socket 10 and the pipe connecting flange 2 are subjected to RT flaw detection to be qualified, a welding groove 9 for welding the pipe connecting 1 is processed on the barrel 3, and the welding groove 9 is in an outer groove form.
The take over 1 welding deformation prevention frock material all adopts 06Cr19Ni10, wherein: 1 piece of round steel with the specification of phi 100mm is adopted as a round rod 8; the J-shaped plates 48 are 30mm thick and are symmetrically arranged on the connecting pipe flanges 2 of the two connecting pipes 1; 2 pieces of inner supporting cylinders 5 and 2 pieces of inner supporting plates 6 are arranged, and the specification phi 219 multiplied by 20 of the inner supporting cylinders 5 is obtained; the specification of the cylinder 3 is phi 325 multiplied by 6, and the specification of the adapter tube 1 is phi 140 multiplied by 16. The pipe joint flange surface crotch size L is 400 + -3.2 mm. In order to ensure that the J-shaped plate 4 can be repeatedly used, the clearance d1 between the J-shaped plate 4 and the outer circle of the pipe connecting flange 2 is designed to be 20 mm; meanwhile, the distance d2 between the inner wall of the inner support cylinder 5 and the edge of the welding groove 9 of the cylinder 3 is designed to be 17mm, so that the deformation prevention effect is ensured.
Specifically, the assembling, welding and flaw detection processes of the connecting pipe 1 and the cylinder 3 are as follows:
(1) the assembly is preapred for an unfavorable turn of events shape frock and barrel 3 and takeover 1.
1) Firstly, the round bar 8 passes through the connecting pipe 1, and the J-shaped plate 4 is trial-installed. The opening size of the two connecting pipes 1 is adjusted according to 802mm, after the opening size is adjusted to be in place, the J-shaped plate 4 and the round bar 8 are fixed and welded by adopting a manual TIG welding point, welding is performed alternately and symmetrically during welding, welding deformation is monitored at any time, and the J-shaped plate 4 is ensured to be attached to the inner side surface of the connecting pipe flange 2.
2) The two inner supporting plates 6 are pre-pressed by a hydraulic jack 7, the misalignment between the inner wall of the cylinder 3 and the end surface of the connecting pipe 1 is eliminated, and the inner side of the cylinder 3 forms certain reversible deformation.
3) The opening end of the cylinder 3 and the gap between the edge of the connecting pipe flange 2 and the round bar 8 are sealed by adopting a sealing paper board, an adhesive tape and the like, the assembling gap between the connecting pipe 1 and the welding groove 9 of the cylinder 3 is adjusted to be uniform, the gap between the connecting pipe 1 and the welding groove 9 is sealed by the adhesive tape, and an air outlet is reserved. The pre-argon was started and when the lighter did not ignite at the outlet, it indicated that the water chamber was drained and filled with argon.
4) And tearing off part of the adhesive tape at the welding groove 9, and tack-welding the connecting pipes 1 by adopting manual TIG welding, wherein at least 4 tack-welding parts are uniformly distributed on each connecting pipe 1.
(2) And welding the connecting pipe 1 and the cylinder 3.
Welding seams of the connecting pipes 1 and the cylinder 3 are welded by manual TIG welding, the two connecting pipes 1 are alternately welded layer by layer, the flat welding position is welded, and cooling is carried out within 1 minute after each layer of welding until the welding is right.
(3) And (5) dismantling the anti-deformation tool.
After the connecting pipe 1 and the cylinder 3 are welded properly and the welding line is cooled to room temperature, a protective pad is arranged on the surface of the connecting pipe flange 2, then a cutting grinding wheel is adopted to cut off the temporary welding line between the J-shaped plate 4 and the round steel, and the cut during cutting is as small as possible, so that the J-shaped plate 4 can be repeatedly used.
Considering that the back of the connecting pipe 1 needs to be protected by argon gas when being welded, a gap of 4mm exists on a single side between the inner supporting plate 6 and the round rod 8 when in design and assembly, so that the argon gas can be conveniently introduced. In order to ensure the welding deformation control effect, after each layer of the connecting pipe 1 and the cylinder 3 is welded, the clean white cloth soaked by the grade A water is immediately coated on a welding seam for cooling, so that the welding stress is quickly released, and the phenomenon that the deformation-preventing tool rebounds after being disassembled is avoided.
The method of the application is adopted to complete the welding of the connecting pipe 1 and the cylinder 3 of the water chamber of the 4 main pump sealed water heat exchangers, the actual measurement value of the crotch size of the flange 2 surface of the connecting pipe is 397-399 mm, no depression occurs in the cylinder 3 in the area adjacent to the welding groove 9, all sizes are qualified without correction, and the welding seam 100% RT is also all qualified at one time, so that a very ideal application effect is obtained.

Claims (9)

1. Take over and internal diameter Di < 600 mm's thin wall barrel anti-deformation frock, its characterized in that: comprises that
The round rod (8) is used for penetrating through the welding groove (9) of the connecting pipe (1) and the cylinder body (3), extending out of the end part of the connecting pipe (1), and can form radial support for the inner wall of the connecting pipe (1);
the inner supporting cylinder (5) is arranged on the inner wall of the welding groove (9) of the cylinder body (3) during welding and is sleeved on the round rod (8);
the inner supporting plate (6) is arranged at one end, far away from the inner wall of the barrel body (3), of the inner supporting barrel (5) during welding and sleeved on the round rod (8), the inner supporting plate (6) tightly supports the inner wall of the welding groove (9) of the barrel body (3) after bearing a vertically applied external force, and the inner supporting barrel (5) forms radial support for the inner wall of the welding groove (9);
j-shaped plate (4), J-shaped plate (4) symmetric connection is on pole (8), and the edge of flange (2) is placed to its indent, and the one side perpendicular to pole (8) of J-shaped plate (4) and flange (2) contact of connecting pipe.
2. The connecting pipe and thin-wall cylinder anti-deformation tool with the inner diameter Di less than 600mm as claimed in claim 1, which is characterized in that: the round bar (8) is made of round steel.
3. The connecting pipe and thin-wall cylinder anti-deformation tool with the inner diameter Di less than 600mm as claimed in claim 1, which is characterized in that: external force is vertically applied to the inner supporting plate (6) through a hydraulic jack (7).
4. The control method of the welding collapse deformation of the connecting pipe and the thin-wall cylinder with the internal diameter Di less than 600mm is characterized in that: the method comprises the following steps:
(a) designing and manufacturing the deformation-preventing tool of claim 1 or 2;
(b) assembling the connecting pipe (1) and the cylinder body (3) to be welded with the round rod (8), the J-shaped plate (4), the inner supporting cylinder (5) and the inner supporting plate (6) of the anti-deformation tool manufactured in the step (a), and ensuring that the inner side surface of the J-shaped plate (4) is tightly attached to the inner side surface of the connecting pipe flange (2) of the connecting pipe (1);
(c) applying vertical pressure on the inner supporting plate (6) assembled in the step (b) to ensure that the inner supporting cylinder (5) can be tightly jacked to the inner wall of the welding groove (9) of the cylinder body (3) to form reverse deformation on the welding groove (9);
(d) welding the connecting pipes (1) to the welding groove (9) of the cylinder body (3), alternately welding the two connecting pipes (1) layer by layer, and welding the horizontal welding position until the welding position is right;
(e) and (d) after the welding is finished in the step (d), dismantling the anti-deformation tool.
5. The method for controlling the welding collapse deformation of the connecting pipe and the thin-wall cylinder with the internal diameter Di less than 600mm as claimed in claim 4, wherein: in the step (b), the opening crotch size L of the flange faces of the two connecting pipes is adjusted according to the upper limit of the deviation tolerance when the J-shaped plate (4) and the round rod (8) are assembled, the J-shaped plate (4) and the round rod (8) are welded after the adjustment is in place, welding deformation is alternately and symmetrically performed during welding and monitored at any time, and the J-shaped plate (4) is ensured to be tightly attached to the inner side face of the connecting pipe flange (2) of the connecting pipe (1).
6. The method for controlling the welding collapse deformation of the connecting pipe and the thin-wall cylinder with the internal diameter Di less than 600mm as claimed in claim 4, wherein: in the step (c), the inner supporting plates (6) are pre-tightly jacked by a hydraulic jack (7), and the misalignment between the end surface of the connecting pipe (1) and the inner wall of the cylinder body (3) is controlled to be less than or equal to 0.5 mm.
7. The method for controlling the welding collapse deformation of the connecting pipe and the thin-wall cylinder with the internal diameter Di less than 600mm as claimed in claim 4, wherein: in the step (d), when the connecting pipe (1) and the cylinder (3) are made of austenitic stainless steel, cooling is carried out within 1 minute after each layer of welding.
8. The method for controlling the welding collapse deformation of the connecting pipe and the thin-wall cylinder with the internal diameter Di less than 600mm as claimed in claim 4, wherein: when welding protection is needed, before the step (d) is carried out, the port of the connecting pipe (1) is closed, the assembling clearance between the connecting pipe (1) and the welding groove (9) of the cylinder body (3) is adjusted to be uniform, the welding groove (9) is closed, an air outlet is reserved at the same time, and then argon is introduced into the cylinder body (3) until the cylinder body (3) and the connecting pipe (1) are filled with argon.
9. The method for controlling the welding collapse deformation of the connecting pipe and the thin-wall cylinder with the internal diameter Di less than 600mm as claimed in claim 4, wherein: and (d) after the connecting pipe (1) and the cylinder (3) are welded and the welding line is cooled to room temperature, cutting off the J-shaped plate (4) from the round rod (8), and then removing the anti-deformation tool.
CN201811638791.5A 2018-12-29 2018-12-29 Method and tool for controlling welding deformation of connecting pipe and cylinder with internal diameter Di smaller than 600mm Active CN109693020B (en)

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