CN117532113A - Flaring type X-shaped groove welding joint and technological method - Google Patents
Flaring type X-shaped groove welding joint and technological method Download PDFInfo
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- CN117532113A CN117532113A CN202210916148.4A CN202210916148A CN117532113A CN 117532113 A CN117532113 A CN 117532113A CN 202210916148 A CN202210916148 A CN 202210916148A CN 117532113 A CN117532113 A CN 117532113A
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- 238000003466 welding Methods 0.000 title claims abstract description 173
- 238000000034 method Methods 0.000 title claims abstract description 92
- 238000003801 milling Methods 0.000 claims description 17
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000010935 stainless steel Substances 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 230000007547 defect Effects 0.000 abstract description 8
- 238000009966 trimming Methods 0.000 abstract description 4
- 230000035515 penetration Effects 0.000 description 13
- 238000003754 machining Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000005520 cutting process Methods 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 230000000087 stabilizing effect Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 230000001174 ascending effect Effects 0.000 description 5
- 238000010891 electric arc Methods 0.000 description 5
- 230000004927 fusion Effects 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Classifications
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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
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
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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
- B23K9/235—Preliminary treatment
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Abstract
The invention discloses a flaring type X-shaped groove welding joint and a process method, wherein the joint comprises a front groove and a back groove which form a symmetrical structure; a blunt edge is arranged in the direction of the front groove from the back groove back chipping starting position; a platform is arranged on a part of the reverse groove; the platform is provided with the opening, is convenient for the back chipping operation. The welding depth of the front groove is h1 = t/2+ x-c/2; the welding depth h2 = t/2-x + c/2 of the reverse groove; where t is the plate thickness, x is the back chipping depth, and c is the blunt edge thickness. The process method comprises joint design, joint assembly, front bevel and back bevel welding; the flaring type X-shaped groove welding joint and the technological method designed in the invention have the advantages of few back chipping steps, unchanged angle after back chipping, few internal defects of welding seams and high angle trimming efficiency, and remarkably improve welding quality and welding operation efficiency.
Description
Technical Field
The invention belongs to the technical field of welding, and particularly relates to a flaring type X-shaped groove welding joint and a process method.
Background
The high-speed motor train unit coupler installation seat is made of aluminum alloy materials, and has high requirements on welding quality after the coupler installation seat is assembled and welded because of high bearing strength, and internal flaw detection (ultrasonic flaw detection and radiographic flaw detection) is required. At present, an I-shaped joint is generally adopted for the joint, and friction stir welding is matched for welding. Limited to the production capacity of friction stir welding equipment, MIG automated welding processes are gradually being used instead, and the welded joints are correspondingly converted into X-type joints. However, in the existing vehicle production, in order to ensure the welding quality of the X-shaped joint weld seam, before the back surface welding, a back chipping method is usually adopted in the process to eliminate root defects, but the problems of complex back chipping steps, large back chipping angle change, low angle trimming efficiency, multiple defects in the weld seam and the like exist.
Patent application number CN201410587645.X discloses a medium plate X-shaped groove non-back gouging welding process, which mainly adopts submerged arc welding under the condition of back non-back gouging, wherein the medium plate X-shaped groove non-back gouging welding process comprises the following steps: A. cutting and assembling before welding; B. front surface backing welding; C. front small current submerged arc welding; D. back welding; E. and (5) remaining filling and capping welding beads. The technical scheme of the invention is that the non-back gouging welding process method for the X-shaped groove of the medium plate is suitable for welding welds with the thickness of more than 10mm, is insensitive to the variation of the difference of the quality, the assembly gap, the misalignment amount and the surface roughness of the groove, and is not suitable for a flaring type X-shaped groove welding joint.
The present application is proposed in view of this.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and the first aim of the invention is to provide a flaring type X-shaped groove welding joint;
the second aim of the invention is to provide a process method of a flaring type X-shaped groove welding joint, which solves the problems of complicated back chipping steps, large back chipping angle change, low angle trimming efficiency, multiple defects in welding seams and the like.
In order to solve the technical problems, the invention adopts the basic conception of the technical scheme that: a technique method of flaring type X-shaped groove welding joint; the process method comprises joint design, joint assembly, front bevel and back bevel welding; the joint design method comprises the following steps:
designing the front bevel and the back bevel by taking the center line of the plate thickness as the back-chipping termination line;
determining the position of a back-face groove back-chipping starting line according to the back-chipping depth;
correcting the shape of the front groove according to the position of the back gouging starting line and a preset groove angle;
and correcting the shape of the reverse groove according to the position of the back chipping termination line and a preset groove angle.
By adopting the scheme, the plate thickness center line is taken as the back gouging end line position 8, the width of the upper part of the back groove can be widened in advance according to the back gouging depth and the preset groove angle, so that the single-side groove angle is kept unchanged after the back gouging end line is connected with the bottom of the back gouged groove, the influence of back gouging operation on the groove angle is eliminated, and the welding quality is improved; meanwhile, the center line of the plate thickness is taken as a back chipping termination line position 8, so that the shape of the front and back grooves after back chipping can be ensured to be in a symmetrical structure, and welding deformation can be reduced; the groove width is increased, so that the groove angle is prevented from being changed after back chipping, the groove angle is ensured to meet the ISO9692-3 standard requirement, an invalid base material cutting area is removed through first groove machining, and the back chipping workload is reduced.
Further, the method for designing the joint further comprises the following steps:
the back groove is provided with a platform according to the position of the back gouging starting line, so that the back gouging operation of the pen-shaped milling cutter is convenient to stabilize;
and designing a blunt edge, and designing the thickness of the blunt edge from the back groove back chipping starting line position to the front groove direction.
By adopting the scheme, the blunt edge is designed to prevent the problem of welding penetration caused by automatic welding. The reverse groove is provided with a local platform, and the middle part of the platform is provided with an opening so as to be convenient for stabilizing the back chipping operation of the pen-shaped milling cutter.
Further, the process method after joint design further comprises joint assembly; the method for assembling the joint comprises the following steps:
assembling by adopting an upward slope welding;
after assembly, positioning, welding and fixing are carried out;
and adding a stainless steel temporary liner on the groove side of the back surface.
By adopting the scheme, the welding is carried out on an ascending slope, namely, a 12mm backing plate is added at the arc receiving end, so that the phenomenon that metal in a molten pool flows to the front of an electric arc to cause poor fusion is avoided.
Further, the process method after the joint assembly further comprises welding the front bevel and the back bevel; the method for welding the front bevel and the back bevel comprises the following steps:
the front bevel welding uses MIG automatic welding to weld the front bevel first layer and the front bevel second layer;
and back groove back chipping treatment.
Further, the swing is increased during the filling welding of the second layer of the front groove, and the swing width is set to be not more than the width of the first layer of backing welding seam of the front groove;
swing pause times are set on both sides of the weld.
Furthermore, back groove back chipping treatment is to use a pen-type milling cutter to perform back chipping from the middle opening of the joint platform to two sides according to a set back chipping depth; the back chipping depth is detected in the back chipping treatment process so as to ensure that the back chipping depth is in a reasonable range, and the influence of back chipping on the bevel angle is eliminated.
By adopting the scheme, the back chipping depth is set according to the back chipping depth, the depth is ensured not to exceed 3mm, and the back chipping depth can be well controlled within a reasonable range by detecting the back chipping depth in the back chipping treatment process.
Further, the back groove welding is carried out after back groove back chipping treatment;
the reverse groove welding is performed by using MIG automatic welding to weld a first layer of the reverse groove and a second layer of the reverse groove;
and after the back bevel is welded, the other layers are welded according to the sequence of the front bevel and the back bevel which are orderly and alternately arranged.
By adopting the scheme, the welding sequence of the other layers is carried out according to the sequence of the front bevel and the back bevel which are orderly and alternately arranged, so that the deformation after welding is reduced.
Further, the swing is increased during the filling welding of the second layer of the reverse groove, and the swing width is set to be not more than the width of the backing welding seam of the first layer of the reverse groove;
swing pause times are set on both sides of the weld.
The invention also provides a flaring type X-shaped groove welding joint; the joint comprises a front groove and a back groove which are of a symmetrical structure; a blunt edge is arranged in the direction of the front bevel by the back bevel back chipping starting line position; a platform is arranged on the part of the reverse groove; the platform is provided with an opening, so that the back chipping operation is facilitated.
By adopting the scheme, the front groove and the back groove are in symmetrical structures, so that welding deformation is reduced; the back groove is locally provided with a platform, and the middle part of the platform is provided with an opening so as to be convenient for stabilizing the back chipping operation of the pen-shaped milling cutter.
Further, the welding depth h1=t/2+x-c/2 of the front groove; the welding depth h2 = t/2-x + c/2 of the reverse groove; where t is the plate thickness, x is the back chipping depth, and c is the blunt edge thickness.
By adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects.
The flaring type X-shaped groove welding joint and the technological method have the advantages of few back chipping steps, no change of angles after back chipping, few internal defects of welding seams and high angle trimming efficiency, and the welding quality and the welding operation efficiency are remarkably improved.
The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. It is evident that the drawings in the following description are only examples, from which other drawings can be obtained by a person skilled in the art without the inventive effort. In the drawings:
FIG. 1 is a schematic diagram of the structure of a front bevel and a back bevel in a flared X-type bevel welding joint according to the present invention;
FIG. 2 is a graph of thickness, back chipping depth, and blunt edge thickness labels for a flared X-groove weld joint of the present invention;
FIG. 3 is a schematic representation of the back gouging start line position and back gouging end line position in a flared X-groove weld joint of the present invention;
FIG. 4 is a schematic view of the pad installation location in a flared X groove weld joint according to the present invention;
FIG. 5 is a schematic view of the location of the platform and opening in a flared X-groove weld joint according to the present invention;
FIG. 6 is a schematic diagram of a back groove back chipping process in a flared X groove weld joint according to the present invention;
FIG. 7 is a schematic diagram showing the effect of back groove back chipping treatment in a flared X-groove weld joint according to the present invention;
FIG. 8 is a schematic logic diagram of a process for a flared X-groove weld joint according to the present invention;
FIG. 9 is a schematic diagram of the design logic of a flared-type X-groove welded joint in accordance with the present invention;
FIG. 10 is a schematic diagram of the joint assembly logic in a process of a flared X-groove weld joint according to the present invention;
FIG. 11 is a schematic diagram of a front groove welding logic in a process of a flared X-groove welding joint according to the present invention;
fig. 12 is a schematic diagram of a reverse groove welding logic in a process of a flared-type X-groove welding joint according to the present invention.
In the figure: 1. a front groove; 2. a reverse groove; 3. a blunt edge; 4. a platform; 5. an opening; 6. a gasket; 7. a back chipping start line position; 8. back-gouging termination line location.
It should be noted that these drawings and the written description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept to those skilled in the art by referring to the specific embodiments.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention, and the following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1, 2, 3 and 5, as an embodiment, the present invention provides a flared-type X-groove weld joint; the joint comprises a front groove 1 and a back groove 2 which are in symmetrical structures; a blunt edge 3 is arranged in the direction from the back groove 2 back chipping starting line position 7 to the front groove 1; a platform 4 is locally arranged on the reverse groove 2; the platform 4 is provided with an opening 5 for facilitating the back-chipping operation.
The width of the upper part of the back groove is widened in advance according to the back chipping depth and the preset groove angle, so that the single-side groove angle is kept unchanged after the back chipping groove is connected with the bottom of the back chipping groove; the addition of blunt edges prevents the problems of penetration of the automatic welding. The reverse groove is provided with a local platform, and the middle part of the platform is provided with an opening so as to be convenient for stabilizing the back chipping operation of the pen-shaped milling cutter.
Compared with a conventional X-shaped joint, the groove width is increased, the purpose is to prevent the groove angle from changing after back chipping, ensure that the groove angle meets the ISO9692-3 standard requirement, remove an invalid base material cutting area through the first groove processing, and reduce the back chipping workload;
the provision of the blunt edge 3 prevents the occurrence of a penetration problem in the automatic welding. A platform 4 is locally arranged on the reverse groove 2, and an opening 5 is arranged in the middle of the platform 4, so that the back chipping operation of the pen-shaped milling cutter is stabilized;
the height of the platform 4 is not too large, the back chipping workload can be increased too large, the height of the platform 4 can be set to be 1mm-3mm, and the height is preferably set to be 2mm; the back chipping workload can be reduced as much as possible while the front groove 1 is formed by backing weld.
Wherein, the welding depth h1=t/2+x-c/2 of the front groove 1; the welding depth h2 = t/2-x + c/2 of the reverse groove 2; where t is the plate thickness, x is the back chipping depth, and c is the blunt edge thickness.
As shown in fig. 3, 4, 8, 9, 10 and 11, as another embodiment, the present invention provides a process for manufacturing a flared-type X-groove welded joint; the technological method comprises joint design, joint assembly, welding of the front bevel 1 and the back bevel 2; the joint design method comprises the following steps:
designing a front bevel 1 and a back bevel 2 by taking the center line of the plate thickness as a back gouging end line position 8;
determining the back-gouging starting line position 7 of the back-side groove 2 according to the back-gouging depth;
correcting the shape of the front groove 1 according to the back chipping starting line position 7 and a preset groove angle;
correcting the shape of the reverse groove 2 according to the back chipping termination line position 8 and a preset groove angle;
the back groove 2 is provided with a platform according to the back gouging starting line position 7, the height of the platform is 2mm, and the back gouging operation of the pen-shaped milling cutter is convenient to stabilize.
Designing a blunt edge 3, and designing the thickness of the blunt edge from the back groove 2 back chipping starting line position 7 to the front groove 1;
by taking the plate thickness center line as the back gouging end line position 8, the width of the upper part of the back groove can be widened in advance according to the back gouging depth and the preset groove angle, so that the single-side groove angle is kept unchanged after the back gouging end line is connected with the bottom of the back gouged groove, the influence of back gouging operation on the groove angle is eliminated, and the welding quality is improved; meanwhile, the center line of the plate thickness is taken as a back chipping termination line position 8, so that the shape of the front and back grooves after back chipping can be ensured to be in a symmetrical structure, and welding deformation can be reduced; the groove width is increased, so that the groove angle is prevented from being changed after back chipping, the groove angle is ensured to meet the ISO9692-3 standard requirement, an invalid base material cutting area is removed through machining through groove primary machining, and the back chipping workload is reduced. The blunt edge is designed to prevent the problem of penetration of the automatic welding. The reverse groove is provided with a local platform, and the middle part of the platform is provided with an opening so as to be convenient for stabilizing the back chipping operation of the pen-shaped milling cutter.
The process further includes joint assembly after joint design; the method for assembling the joint comprises the following steps:
assembling by adopting an upward slope welding;
after assembly, positioning, welding and fixing are carried out;
a stainless steel temporary liner 6 is added on the side of the reverse groove 2.
The welding is carried out on an ascending slope, namely, a 12mm backing plate is added at the arc receiving end, so that the phenomenon that metal in a molten pool flows to the front of an electric arc to cause poor fusion is avoided;
the assembly clearance is preferably 2mm, so as to ensure penetration;
a temporary liner 6 is added to the reverse groove 2; the thickness of the temporary liner 6 is equal to the distance from the back gouging start line location 7 to the surface of the negative groove 2.
The process method after the joint is assembled further comprises the steps of welding the front bevel 1 and the back bevel 2; the method for welding the front bevel 1 and the back bevel 2 comprises the following steps:
welding the front groove 1, namely welding a first layer of the front groove 1 and a second layer of the front groove 1 by using MIG automatic welding;
back groove 2 back chipping treatment.
The swing is increased during the second layer of filling welding of the front groove 1, and the swing width is not more than the width of the first layer of backing welding seam of the front groove 1;
swing pause time is set at two sides of the welding seam, so that sidewall penetration is increased, and sidewall unfused defects are reduced;
back groove 2 back chipping treatment, wherein the back chipping depth is controlled within 3 mm;
the term "MIG automatic welding" refers to a welding method in which a welding portion is covered with an inert gas, an arc is made stable and a change in welding quality is prevented, a metal of the welding portion is thermally melted by the arc, and a welding rod is fed to join the welding seams, and is also commonly called semi-automatic welding, covered gas arc welding, carbon dioxide arc welding, or the like.
As shown in fig. 3, 4, 8, 9, 10 and 11, as an embodiment, the present invention provides a process for manufacturing a flared-type X-groove welded joint; the technological method comprises joint design, joint assembly, welding of the front bevel 1 and the back bevel 2; the joint design method comprises the following steps:
designing a front bevel 1 and a back bevel 2 by taking the center line of the plate thickness as a back gouging end line position 8;
determining the back-gouging starting line position 7 of the back-side groove 2 according to the back-gouging depth;
correcting the shape of the front groove 1 according to the back chipping starting line position 7 and a preset groove angle;
correcting the shape of the reverse groove 2 according to the back chipping termination line position 8 and a preset groove angle;
the back groove 2 is provided with a platform according to the back gouging starting line position 7, the height of the platform is 2mm, and the back gouging operation of the pen-shaped milling cutter is convenient to stabilize.
Designing a blunt edge 3, and designing the thickness of the blunt edge from the back groove 2 back chipping starting line position 7 to the front groove 1;
by taking the plate thickness center line as the back gouging end line position 8, the width of the upper part of the back groove can be widened in advance according to the back gouging depth and the preset groove angle, so that the single-side groove angle is kept unchanged after the back gouging end line is connected with the bottom of the back gouged groove, the influence of back gouging operation on the groove angle is eliminated, and the welding quality is improved; meanwhile, the center line of the plate thickness is taken as a back chipping termination line position 8, so that the shape of the front and back grooves after back chipping can be ensured to be in a symmetrical structure, and welding deformation can be reduced; the groove width is increased, so that the groove angle is prevented from being changed after back chipping, the groove angle is ensured to meet the ISO9692-3 standard requirement, an invalid base material cutting area is removed through machining through groove primary machining, and the back chipping workload is reduced. The blunt edge is designed to prevent the problem of penetration of the automatic welding. The reverse groove is provided with a local platform, and the middle part of the platform is provided with an opening so as to be convenient for stabilizing the back chipping operation of the pen-shaped milling cutter.
The process further includes joint assembly after joint design; the method for assembling the joint comprises the following steps:
assembling by adopting an upward slope welding;
after assembly, positioning, welding and fixing are carried out;
a stainless steel temporary liner 6 is added on the side of the reverse groove 2.
The welding is carried out on an ascending slope, namely, a 12mm backing plate is added at the arc receiving end, so that the phenomenon that metal in a molten pool flows to the front of an electric arc to cause poor fusion is avoided;
the assembly clearance is preferably 2mm, so as to ensure penetration;
a temporary liner 6 is added to the reverse groove 2; the thickness of the temporary liner 6 is equal to the distance from the back gouging start line location 7 to the surface of the negative groove 2.
The process method after the joint is assembled further comprises the steps of welding the front bevel 1 and the back bevel 2; the method for welding the front bevel 1 and the back bevel 2 comprises the following steps:
welding the front groove 1, namely welding a first layer of the front groove 1 and a second layer of the front groove 1 by using MIG automatic welding;
back groove 2 back chipping treatment.
The back groove 2 back chipping treatment is to use a pen-type milling cutter to perform back chipping from the opening 5 in the middle of the joint platform 4 to two sides according to the set back chipping depth; the back chipping depth is detected in the back chipping treatment process so as to ensure that the back chipping depth is in a reasonable range, and the influence of back chipping on the bevel angle is eliminated.
According to the setting back chipping depth, the depth is ensured not to exceed 3mm, and the back chipping depth can be well controlled within a reasonable range by detecting the back chipping depth in the back chipping treatment process.
As shown in fig. 3, 4, 8, 9, 10, 11 and 12, as an embodiment, the present invention provides a process for manufacturing a flared-type X-groove welded joint; the technological method comprises joint design, joint assembly, welding of the front bevel 1 and the back bevel 2; the joint design method comprises the following steps:
designing a front bevel 1 and a back bevel 2 by taking the center line of the plate thickness as a back gouging end line position 8;
determining the back-gouging starting line position 7 of the back-side groove 2 according to the back-gouging depth;
correcting the shape of the front groove 1 according to the back chipping starting line position 7 and a preset groove angle;
correcting the shape of the reverse groove 2 according to the back chipping termination line position 8 and a preset groove angle;
the back groove 2 is provided with a platform according to the back gouging starting line position 7, the height of the platform is 2mm, and the back gouging operation of the pen-shaped milling cutter is convenient to stabilize.
Designing a blunt edge 3, and designing the thickness of the blunt edge from the back groove 2 back chipping starting line position 7 to the front groove 1;
by taking the plate thickness center line as the back gouging end line position 8, the width of the upper part of the back groove can be widened in advance according to the back gouging depth and the preset groove angle, so that the single-side groove angle is kept unchanged after the back gouging end line is connected with the bottom of the back gouged groove, the influence of back gouging operation on the groove angle is eliminated, and the welding quality is improved; meanwhile, the center line of the plate thickness is taken as a back chipping termination line position 8, so that the shape of the front and back grooves after back chipping can be ensured to be in a symmetrical structure, and welding deformation can be reduced; the groove width is increased, so that the groove angle is prevented from being changed after back chipping, the groove angle is ensured to meet the ISO9692-3 standard requirement, an invalid base material cutting area is removed through machining through groove primary machining, and the back chipping workload is reduced. The blunt edge is designed to prevent the problem of penetration of the automatic welding. The reverse groove is provided with a local platform, and the middle part of the platform is provided with an opening so as to be convenient for stabilizing the back chipping operation of the pen-shaped milling cutter.
The process further includes joint assembly after joint design; the method for assembling the joint comprises the following steps:
assembling by adopting an upward slope welding;
after assembly, positioning, welding and fixing are carried out;
a stainless steel temporary liner 6 is added on the side of the reverse groove 2.
The welding is carried out on an ascending slope, namely, a 12mm backing plate is added at the arc receiving end, so that the phenomenon that metal in a molten pool flows to the front of an electric arc to cause poor fusion is avoided;
the assembly clearance is preferably 2mm, so as to ensure penetration;
a temporary liner 6 is added to the reverse groove 2; the thickness of the temporary liner 6 is equal to the distance from the back gouging start line location 7 to the surface of the negative groove 2.
The process method after the joint is assembled further comprises the steps of welding the front bevel 1 and the back bevel 2; the method for welding the front bevel 1 and the back bevel 2 comprises the following steps:
welding the front groove 1, namely welding a first layer of the front groove 1 and a second layer of the front groove 1 by using MIG automatic welding;
back groove 2 back chipping treatment.
Carrying out back groove 2 welding after back chipping treatment of the back groove 2;
and welding the back groove 2, namely welding a first layer of the back groove 2 and a second layer of the back groove 2 by using MIG automatic welding.
The swinging is increased during the filling welding of the second layer of the reverse groove 2, and the swinging width is not more than the width of the first layer of backing welding seam of the reverse groove 2;
swing pause time is set at two sides of the welding seam, so that sidewall penetration is increased, and sidewall unfused defects are reduced;
back groove 2 back chipping treatment, wherein the back chipping depth is controlled within 3 mm;
the term "MIG automatic welding" refers to a welding method in which a welding portion is covered with an inert gas, an arc is made stable and a change in welding quality is prevented, a metal of the welding portion is thermally melted by the arc, and a welding rod is fed to join the welding seams, and is also commonly called semi-automatic welding, covered gas arc welding, carbon dioxide arc welding, or the like.
As shown in fig. 3, 4, 8, 9, 10, 11 and 12, as an embodiment, the present invention provides a process for manufacturing a flared-type X-groove welded joint; the technological method comprises joint design, joint assembly, welding of the front bevel 1 and the back bevel 2; the joint design method comprises the following steps:
designing a front bevel 1 and a back bevel 2 by taking the center line of the plate thickness as a back gouging end line position 8;
determining the back-gouging starting line position 7 of the back-side groove 2 according to the back-gouging depth;
correcting the shape of the front groove 1 according to the back chipping starting line position 7 and a preset groove angle;
correcting the shape of the reverse groove 2 according to the back chipping termination line position 8 and a preset groove angle;
the back groove 2 is provided with a platform according to the back gouging starting line position 7, the height of the platform is 2mm, and the back gouging operation of the pen-shaped milling cutter is convenient to stabilize.
Designing a blunt edge 3, and designing the thickness of the blunt edge from the back groove 2 back chipping starting line position 7 to the front groove 1;
by taking the plate thickness center line as the back gouging end line position 8, the width of the upper part of the back groove can be widened in advance according to the back gouging depth and the preset groove angle, so that the single-side groove angle is kept unchanged after the back gouging end line is connected with the bottom of the back gouged groove, the influence of back gouging operation on the groove angle is eliminated, and the welding quality is improved; meanwhile, the center line of the plate thickness is taken as a back chipping termination line position 8, so that the shape of the front and back grooves after back chipping can be ensured to be in a symmetrical structure, and welding deformation can be reduced; the groove width is increased, so that the groove angle is prevented from being changed after back chipping, the groove angle is ensured to meet the ISO9692-3 standard requirement, an invalid base material cutting area is removed through machining through groove primary machining, and the back chipping workload is reduced. The blunt edge is designed to prevent the problem of penetration of the automatic welding. The reverse groove is provided with a local platform, and the middle part of the platform is provided with an opening so as to be convenient for stabilizing the back chipping operation of the pen-shaped milling cutter.
The process further includes joint assembly after joint design; the method for assembling the joint comprises the following steps:
assembling by adopting an upward slope welding;
after assembly, positioning, welding and fixing are carried out;
a stainless steel temporary liner 6 is added on the side of the reverse groove 2.
The welding is carried out on an ascending slope, namely, a 12mm backing plate is added at the arc receiving end, so that the phenomenon that metal in a molten pool flows to the front of an electric arc to cause poor fusion is avoided;
the assembly clearance is preferably 2mm, so as to ensure penetration;
a temporary liner 6 is added to the reverse groove 2; the thickness of the temporary liner 6 is equal to the distance from the back gouging start line location 7 to the surface of the negative groove 2.
The process method after the joint is assembled further comprises the steps of welding the front bevel 1 and the back bevel 2; the method for welding the front bevel 1 and the back bevel 2 comprises the following steps:
welding the front groove 1, namely welding a first layer of the front groove 1 and a second layer of the front groove 1 by using MIG automatic welding;
back groove 2 back chipping treatment.
Carrying out back groove 2 welding after back chipping treatment of the back groove 2;
and welding the back groove 2, namely welding a first layer of the back groove 2 and a second layer of the back groove 2 by using MIG automatic welding.
After the back groove 2 is welded, the other layers are welded according to the sequence of the front groove 1 and the back groove 2 which are orderly and alternately arranged;
and the front bevel 1 and the back bevel 2 are welded in three layers and four ways.
The welding sequence of the other layers is performed according to the sequence of the front bevel and the back bevel, which are sequentially alternated, so that the deformation after welding is reduced.
The foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited to the above-mentioned embodiment, but is not limited to the above-mentioned embodiment, and any simple modification, equivalent change and modification made by the above-mentioned embodiment according to the technical matter of the present invention can be further combined or replaced by equivalent embodiments without departing from the scope of the technical solution of the present invention.
Claims (10)
1. The process method of the flaring type X-shaped groove welding joint is characterized by comprising joint design, joint assembly and welding of a front groove (1) and a back groove (2); the joint design method comprises the following steps:
designing the front bevel (1) and the back bevel (2) by taking the center line of the plate thickness as a back-chipping end line position (8);
determining the back-gouging starting line position (7) of the back-side groove (2) according to the back-gouging depth;
correcting the shape of the front groove (1) according to the back gouging starting line position (7) and a preset groove angle;
and correcting the shape of the reverse groove (2) according to the back gouging end line position (8) and a preset groove angle.
2. The method of claim 1, wherein the method of designing the joint further comprises:
the back groove (2) is provided with a platform according to the back gouging starting line position (7), so that the back gouging operation of the pen-shaped milling cutter is convenient to stabilize;
and designing a blunt edge (3), and designing the blunt edge thickness from the back groove (2) back chipping starting line position (7) to the front groove (1) direction.
3. The process for manufacturing a flared X groove weld joint as defined in claim 1, wherein the process further comprises joint assembly after the joint design; the method for assembling the joint comprises the following steps:
assembling by adopting an upward slope welding;
after assembly, positioning, welding and fixing are carried out;
and a stainless steel temporary liner (6) is added on the side of the reverse groove (2).
4. A process for manufacturing a flared-type, X-groove welded joint according to claim 3, characterized in that the process further comprises welding the face groove (1) with the back groove (2) after the joint is assembled; the method for welding the front bevel (1) and the back bevel (2) comprises the following steps:
the front bevel (1) is welded, and MIG automatic welding is used for welding a first layer of the front bevel (1) and a second layer of the front bevel (1);
and back groove (2) back chipping treatment.
5. The process for the flared X-shaped groove welding joint according to claim 4, wherein the swinging is increased when the second layer of the front groove (1) is welded in a filling way, and the swinging width is not more than the width of the first layer of the front groove (1) in a backing welding way;
swing pause times are set on both sides of the weld.
6. The process method of the flaring type X-shaped groove welding joint according to claim 4, wherein the back groove (2) is back-gouged according to a set back-gouging depth, and a pen-type milling cutter is used for back-gouging from an opening (5) in the middle of a joint platform (4) to two sides; the back chipping depth is detected in the back chipping treatment process so as to ensure that the back chipping depth is in a reasonable range, and the influence of back chipping on the bevel angle is eliminated.
7. The process for a flared type X groove welded joint according to claim 4, characterized in that the back groove (2) is welded after the back groove (2) back-gouging treatment;
the reverse groove (2) is welded, and MIG automatic welding is used for welding a first layer of the reverse groove (2) and a second layer of the reverse groove (2);
and after the back bevel (2) is welded, the other layers are welded according to the sequence of the front bevel (1) and the back bevel (2) which are alternated in turn.
8. The process for manufacturing the flaring type X-shaped groove welding joint according to claim 7, wherein swinging is increased when the second layer of the reverse groove (2) is welded in a filling way, and the swinging width is not more than the width of the first layer of the reverse groove (2) in a backing welding way;
swing pause times are set on both sides of the weld.
9. A flared-type X-groove welded joint designed by the process according to any one of claims 1-2, characterized in that it comprises a front groove (1) and a back groove (2) of a symmetrical structure; a blunt edge (3) is arranged in the direction of the front bevel (1) by the back bevel (2) back chipping starting line position (7); a platform (4) is locally arranged on the reverse groove (2); the platform (4) is provided with an opening (5) which is convenient for back chipping operation.
10. A flared X-groove welded joint according to claim 9, characterized in that the welding depth h1=t/2+x-c/2 of the face groove (1); the welding depth h2 = t/2-x + c/2 of the reverse groove (2); where t is the plate thickness, x is the back chipping depth, and c is the blunt edge thickness.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210916148.4A CN117532113A (en) | 2022-08-01 | 2022-08-01 | Flaring type X-shaped groove welding joint and technological method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210916148.4A CN117532113A (en) | 2022-08-01 | 2022-08-01 | Flaring type X-shaped groove welding joint and technological method |
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| CN117532113A true CN117532113A (en) | 2024-02-09 |
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|---|---|---|---|
| CN202210916148.4A Pending CN117532113A (en) | 2022-08-01 | 2022-08-01 | Flaring type X-shaped groove welding joint and technological method |
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| Country | Link |
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| CN (1) | CN117532113A (en) |
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- 2022-08-01 CN CN202210916148.4A patent/CN117532113A/en active Pending
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