CN103978290A - Joint welding clamp of titanium alloy straight pipe and joint welding method - Google Patents
Joint welding clamp of titanium alloy straight pipe and joint welding method Download PDFInfo
- Publication number
- CN103978290A CN103978290A CN201410198301.XA CN201410198301A CN103978290A CN 103978290 A CN103978290 A CN 103978290A CN 201410198301 A CN201410198301 A CN 201410198301A CN 103978290 A CN103978290 A CN 103978290A
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- titanium alloy
- breather pipe
- arc
- welding
- straight tube
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 97
- 238000003466 welding Methods 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 19
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 106
- 239000010949 copper Substances 0.000 claims abstract description 106
- 229910052802 copper Inorganic materials 0.000 claims abstract description 106
- 230000001681 protective effect Effects 0.000 claims abstract description 42
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 239000000565 sealant Substances 0.000 claims description 15
- 238000009423 ventilation Methods 0.000 claims description 12
- 238000010030 laminating Methods 0.000 claims description 9
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- 238000005554 pickling Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 241000322338 Loeseliastrum Species 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 239000002932 luster Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 22
- 239000011261 inert gas Substances 0.000 abstract description 5
- 229920001651 Cyanoacrylate Polymers 0.000 abstract 1
- 239000004830 Super Glue Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 11
- 230000000153 supplemental effect Effects 0.000 description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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
- B23K9/16—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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
-
- 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
- B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
-
- 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
-
- 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
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/14—Titanium or alloys thereof
Abstract
The invention discloses a joint welding clamp of a titanium alloy straight pipe and a joint welding method. The joint welding quality and precision of the titanium alloy straight pipe can be guaranteed by adopting auxiliary supporting and clamping inside the titanium alloy straight pipe and protecting a welding influenced region by inert gas. The method comprises the steps of sealing places where copper sleeves are matched with the titanium alloy straight pipe by sealing tapes at the two ends of a gas feeding pipe, feeding protective gas to a weld joint by two exhaust holes in the feeding pipe, and forming an integral part for supporting a welding region in an auxiliary way by fixedly connecting an arc-shaped copper block, with two exhaust holes, on the gas feeding pipe through super glue; taking out the gas feeding pipe and the arc-shaped copper block from the titanium alloy straight pipe after the completion of welding due to the fact that the radian of the arc-shaped copper block is smaller than a semicircle, performing gas protection on the welding joint outside the titanium alloy straight pipe by a protective cover, fixing a welding gun on the protective cover by a clamp ring, and driving the welding gun to move by moving the protective cover; clamping the titanium alloy straight pipe by adopting an arc-shaped clamp, in order to guarantee the welding continuity..
Description
Technical field
The invention belongs to machine-building and technology field, specifically, relate to a kind of seam weld jig and seam welding method of titanium alloy straight tube.
Background technology
Titanium alloy has good corrosion resistance, and has the advantages that proportion is little, intensity is high.Along with the development of China's Aviation Industry, the consumption of titanium alloy plate in aircraft manufacturing is in continuous growth; Conventionally, in airplane component processing, have in a large amount of oil gas pipe component, particularly large aircraft, the diameter of this oil gas pipeline is increasing.Thereby the manufacture of major diameter pipeline is generally by plate cold bending, then straight tube seam crossing after being shaped is welded and obtains titanium alloy pipe fitting.It is simple that the method for this processing large diameter pipe fitting has technique, and stock utilization is high, the advantage that cost is low.
Because titanium alloy at high temperature has great affinity to oxygen, nitrogen, hydrogen, carbon gas, this brings certain difficulty to welding, and not only weld seam molten bath needs protection, and weldment inside also will be protected.A kind of gas protective cover for small-diameter titanium tube welding is disclosed in patent CN201900394U, this tubular protective cover seals pipe fitting to be welded, in seal area, be connected with protective gas, make welding region form protective gas atmosphere, thereby effectively eliminate titanium pipe welding oxidation hazards; But weak point is to overcome that weld seam He Jinfeng district local temperature is too high causes material deliquescing and occur that the expansion of commissure local collapse problem and heat affected area causes the wave buckling deformation problem that welding stress increase causes, and affects form accuracy.The thermal conductivity factor of titanium alloy is lower, and weld seam He Jinfeng district, because of long in the hot environment time of staying, causes this region material deliquescing, if material inner side does not have supplemental support, material can subside because of deliquescing, in addition, expansion due to heat affected area, welding stress increase causes that buckling deformation is very serious, if outer material side not clamping there will be wave buckling deformation, weld cooling after, titanium alloy hardness is very large again, thisly with local collapse and wave buckling deformation part, be difficult to become qualified parts by follow-up school shape operation, thereby when form accuracy is required to the welding of high titanium alloy pipe fitting, weld seam molten bath not only, weldment is inner, inert gas shielding need to be carried out in weld seam and heat-affected zone, and supplemental support is carried out in the place that need to the wave buckling deformation that deliquescing is subsided and welding stress increase causes easily occur at weld seam He Jinfeng district material and clamping overcomes welding deformation, therefore need to a kind ofly can guarantee the seam welding quality of titanium alloy straight tube and the method for form accuracy.
Summary of the invention
For the weld seam He Jinfeng district that overcomes prior art is because of long in the hot environment time of staying; the local collapse that causes material easily deliquescing to occur and cause and the expansion of heat affected area cause the wave buckling deformation problem that welding stress increase causes; the present invention proposes a kind of seam weld jig and seam welding method of titanium alloy straight tube; object is by carrying out supplemental support and clamping in titanium alloy tube inside, and adopts inert gas welding influence area to be protected to guarantee seam welding quality and the precision of titanium alloy straight tube.First at the first breather pipe two ends, with sealant tape, copper sheathing and titanium alloy straight tube cooperation place are sealed, on the first breather pipe, have two row's circular holes to make to protect gas to lead to commissure; Then on the first breather pipe, with seccotine, be connected one and also have the arc copper billet of two row's circular holes to form a global facility, weld zone is carried out to supplemental support; The outer side weld of titanium alloy straight tube carries out gas shield by protective cover, welding gun is fixed on protective cover, by mobile protective cover, drive welding gun to move, on titanium alloy straight tube, form mobile protection zone, seam crossing to not welding seals with sealant tape, with the movement of welding gun, the progressive sealant tape of tearing; For guaranteeing the continuity of welding, titanium alloy straight tube adopts circular arc jig to clamp.
The technical solution adopted for the present invention to solve the technical problems is: the seam weld jig of titanium alloy straight tube comprises ventilation nozzle, plugging plate, copper sheathing, welding gun, protective cover, arc copper billet, the first breather pipe, circular arc jig, described the first breather pipe is cylindrical shape, there is external screw thread at two ends, in the first airway wall, there is vertically the identical circular hole of the equidistant diameter of two rows, plugging plate is positioned at the first breather pipe two ends, plugging plate external diameter is identical with the first breather pipe internal diameter, and be interference fit, wherein, there is ventilation nozzle installing hole at the plugging plate center of one end; On described arc copper billet, there is vertically the circular hole that the equidistant diameter of two rows is 2mm, the radian of arc copper billet is less than semi arch, arc copper billet is fixed on the first breather pipe, arc copper billet inner arc face and the first breather pipe lateral surface adopt seccotine laminating, two row's circular holes on arc copper billet two row's circular hole and the first breather pipe are measure-alike, and the circular hole on arc copper billet is coaxially corresponding one by one with the circular hole on the first breather pipe; Described copper sheathing is stairstepping cylindrical structure, and copper sheathing inner side has screw thread, two copper sheathings to be positioned at the first breather pipe two ends, and copper sheathing and the first breather pipe are threaded connection; Protective cover is positioned at middle part above arc copper billet, titanium alloy straight tube is arranged on fixture, the exterior arc surface of the face of cylinder and arc copper billet laminating inside titanium alloy straight tube, the weld seam of titanium alloy straight tube is positioned on the axial plane of symmetry of the row of two on arc copper billet circular hole, circular arc jig clamps titanium alloy straight tube, the inner arc face of circular arc jig and the laminating of the outer arc face of titanium alloy straight tube; Described protective cover comprises cover body, snap ring, the second breather pipe, copper mesh, high-temperature resistant rubber piece; welding gun is fixed on cover body by snap ring; cover body top has screw installation ventilation nozzle to be connected with the second breather pipe; on the second breather pipe, there are vertically a plurality of circular holes; copper mesh is between the second breather pipe and weld metal zone; high-temperature resistant rubber piece adopts seccotine to be connected in cover body two bottom sides and rear end face, and contacts cooperation with titanium alloy straight tube.
Adopt the seam weld jig of described titanium alloy straight tube to carry out a seam welding method for titanium alloy straight tube, it is characterized in that comprising the following steps:
Step 1, determine the size of the arc copper billet of weld jig, according to the internal diameter of titanium alloy straight tube to be welded and length dimension, determine the size of arc copper billet, the global facility that arc copper billet and the first breather pipe form radially size is less than the internal diameter of titanium alloy straight tube, guarantees that arc copper billet and the global facility of the first breather pipe composition take out in titanium alloy straight tube from welding;
Step 2, adopt seccotine that arc copper billet is connected on the first breather pipe, and two row's circular hole centering accurate positionings on two row's circular holes on assurance arc copper billet and the first breather pipe, two plugging plates are arranged on the first breather pipe, arc copper billet and the first breather pipe integral body are placed in titanium alloy straight tube, and copper sheathing is screwed into respectively to precalculated position from the first breather pipe two ends, at copper sheathing, contacting end face with titanium alloy straight tube seals with sealant tape, titanium alloy straight tube is clamped with circular arc jig, ventilation nozzle is installed on plugging plate and is connected protection gas, finally welding gun is arranged on to the precalculated position on protective cover,
Step 3, butt welding mouth region and welding wire carry out pickling, remove its surperficial oxide-film, until aobvious silvery white metallic luster; After pickling, clean acid solution and also with calico, dry, with acetone or alcohol wiping weld bond and welding wire again; Not weld zone on Butt welding gun moving direction, adopts sealant tape sealing, and the first breather pipe and protective cover is ventilated, and time 30s, gets rid of the air in the first breather pipe and protective cover;
Step 4, carries out welding operation, adopts leftward welding, torch neck is vertical with welded piece, tungsten electrode extension elongation and nozzle are little from weldment surface distance, to obtain gas shield effect, and the sealant tape of tearing gradually in the titanium alloy straight tube seam of welding gun the place ahead along with the movement of protective cover;
Step 5, after titanium alloy straight tube welding, naturally cooling 5min, unloads circular arc jig, screws out the copper sheathing at the first breather pipe two ends, takes out the first breather pipe and arc copper billet, unloads weld-end fittings;
Step 6, repeats above-mentioned steps 1 to step 5, carries out batch welding.
Beneficial effect
Seam weld jig and the seam welding method of a kind of titanium alloy straight tube that the present invention proposes, by the inner side at titanium alloy straight tube, adopt the two row's circular holes that have on the first breather pipe to guarantee that protection gas leads to commissure, and gas shield is carried out by protective cover in the commissure, outside at titanium alloy straight tube, welding gun is fixed on protective cover, eliminates in welding process the impact due to operating personnel's hand shake welding quality; By mobile protective cover, drive welding gun to move, on titanium alloy straight tube, form mobile protection zone.In welding process, for saving protection gas, the seam crossing of not welding is sealed with sealant tape, along with the movement of welding gun, the sealant tape of tearing gradually; Seam weld jig in weld seam molten bath, inner, the weld seam of weldment and heat-affected zone form inert gas shielding district, make welding region form protective gas atmosphere, thereby effectively eliminate titanium pipe welding oxidation hazards; In addition, inner side at titanium alloy straight tube forms supplemental support part by the first breather pipe and arc copper billet, can easily there is the deliquescing place that subsides at weld seam He Jinfeng district material and carry out supplemental support, avoid this region because growing and to cause material that the local collapse problem that deliquescing causes easily occurs in the hot environment time of staying.Outside at titanium alloy straight tube clamps by employing circular arc jig, avoids the expansion of heat affected area to cause the wave buckling deformation problem that welding stress increase causes; Simultaneously, because arc copper billet radian is less than semi arch, make global facility that the first breather pipe and arc copper billet form radially size be less than the internal diameter of titanium alloy straight tube, can guarantee that the global facility that the first breather pipe and arc copper billet form successfully takes out in the titanium alloy straight tube welding, in circular arc jig, arc size is identical with titanium alloy straight tube excircle dimension, guarantees fitting tightly of circular arc jig and titanium alloy straight tube.Weld jig of the present invention and seam welding method can overcome welding deformation and welding problem of oxidation effectively, and can guarantee preferably the form accuracy of seam welding quality and titanium alloy straight tube.
Accompanying drawing explanation
Below in conjunction with drawings and embodiments, the seam weld jig of a kind of titanium alloy straight tube of the present invention and seam welding method are described in further detail.
Defective form figure when Fig. 1 is the welding of titanium alloy straight tube seam, in figure, I represents weld metal zone.
Fig. 2 is the seam weld jig structural representation of titanium alloy straight tube of the present invention.
Fig. 3 is the supplemental support part-structure cutaway view of titanium alloy straight tube seam weld jig of the present invention.
Fig. 4 is the structural representation that arc copper billet of the present invention and the first breather pipe glue connect.
Fig. 5 is the arc copper billet schematic diagram of titanium alloy straight tube seam weld jig of the present invention.
Fig. 6 is the protective cover structural representation of titanium alloy straight tube seam weld jig of the present invention.
Fig. 7 is the protective cover cutaway view of titanium alloy straight tube seam weld jig of the present invention.
In figure:
1. ventilation nozzle 2. plugging plate 3. copper sheathing 4. welding gun 5. protective cover 6. arc copper billet 7. first breather pipe 8. circular arc jig 9. snap ring 10. cover body 11. second breather pipe 12. high-temperature resistant rubber piece 13. copper mesh
The specific embodiment
The present embodiment is a kind of seam weld jig and seam welding method of titanium alloy straight tube.
Consult Fig. 1～Fig. 5, the seam weld jig of the present embodiment titanium alloy straight tube is by ventilation nozzle 1, plugging plate 2, and copper sheathing 3, welding gun 4, protective cover 5, arc copper billet 6, the first breather pipes 7, circular arc jig 8 forms.The first breather pipe 7 is columnar structured, there is external screw thread at two ends, on the first breather pipe 7 tube walls, there is vertically the identical circular hole of the equidistant diameter of two rows, plugging plate 2 is arranged on the two ends in the first breather pipe 7, plugging plate 2 external diameters are identical with the first breather pipe 7 internal diameters, and plugging plate 2 and the first breather pipe 7 are interference fit, and adopt sealant sealing end face, wherein, there is ventilation nozzle 1 installing hole at plugging plate 2 centers of one end.On arc copper billet 6, there is vertically the circular hole that the equidistant diameter of two rows is 2mm, the radian of arc copper billet 6 is less than semi arch, arc copper billet 6 is fixed on the first breather pipe 7, arc copper billet 6 inner arc faces and the first breather pipe 7 lateral surfaces adopt seccotine laminating, two row's circular holes on arc copper billet 6 two row's circular hole and the first breather pipe 7 are measure-alike, and the row of two on arc copper billet 6 circular hole is coaxially corresponding one by one with the row of two on the first breather pipe 7 circular hole, and play positioning action.Copper sheathing 3 is stairstepping cylindrical structure, and copper sheathing 3 madial walls have screw thread, and two copper sheathings 3 are arranged on the two ends of the first breather pipe 7, and copper sheathing 3 and the first breather pipe 7 are threaded connection; The size of copper sheathing 3 is determined according to the inside/outside diameter size of titanium alloy straight tube to be welded and to the requirement of folder rigidity, copper sheathing 3 employing brass materials.Protective cover 5 is arranged on arc copper billet 6 middle part above; the axial symmetry face of protective cover 5 overlaps with the axial plane of symmetry of the row of two on the first breather pipe 7 circular hole; titanium alloy straight tube is arranged between protective cover 5 and arc copper billet 6; the exterior arc surface of the face of cylinder and arc copper billet 6 laminating inside titanium alloy straight tube; the weld seam of titanium alloy straight tube is positioned on the Central Symmetry face of the row of two on the first breather pipe 7 circular hole; circular arc jig 8 clamps titanium alloy straight tube, the inner arc face of circular arc jig 8 and the laminating of the outer arc face of titanium alloy straight tube.
As shown in Figure 6, Figure 7; the protective cover 5 of weld jig comprises cover body 10, snap ring 9, the second breather pipe 11, copper mesh 13, high-temperature resistant rubber piece 12; welding gun 4 is fixedly mounted on cover body 10 by snap ring 9; cover body 10 tops have passage to be connected with the second breather pipe 11; on the second breather pipe 11, there are vertically a plurality of circular holes; copper mesh 13 is arranged between the second breather pipe 11 and weld metal zone, and high-temperature resistant rubber piece 12 adopts seccotine to be connected in cover body 10 two bottom sides and rear end face.Because high-temperature resistant rubber piece 12 has flexibility, guarantee to contact with titanium alloy straight tube cooperation fully, make to there is enough inert gas shielding districts in mobile protective cover 5, play the effect of province's gas simultaneously.
In the present embodiment, the size of the arc copper billet 6 of weld jig is determined by internal diameter and the length dimension of titanium alloy straight tube to be welded, the central angle of arc section is 120 °, arc copper billet radian is less than semi arch, guarantees that welding finishes rear the first breather pipe 7 and arc copper billet 3 successfully takes out in titanium alloy straight tube.The size of the first breather pipe 7 and plugging plate 2 is definite by the size of arc copper billet 6 and copper sheathing 3, and the first breather pipe 7 materials are 45 steel, and the internal diameter of the first breather pipe 7 is 20mm in the present embodiment; The internal diameter of circular arc jig 8 is 60mm, and central angle is 135 °.
Seam weld jig based on above-mentioned titanium alloy straight tube, the invention allows for a kind of seam welding method of titanium alloy straight tube, comprises the following steps:
Step 1, determine the size of the arc copper billet of weld jig, according to the internal diameter of titanium alloy tube to be welded and length dimension, determine the size of arc copper billet, the global facility that arc copper billet and the first breather pipe form radially size is less than the internal diameter of titanium alloy straight tube, guarantees that arc copper billet and the global facility of the first breather pipe composition take out in titanium alloy straight tube from welding;
Step 2, adopt seccotine that arc copper billet is connected on the first breather pipe, and guarantee two row's circular hole centering accurate positionings of two row's circular holes and first breather pipe of arc copper billet, two plugging plates are arranged on the first breather pipe, arc copper billet and the first breather pipe integral body are placed in titanium alloy straight tube, and copper sheathing is screwed into respectively to precalculated position from the first breather pipe two ends, at copper sheathing, contacting end face with titanium alloy straight tube seals with sealant tape, integral body is clamped with circular arc jig, ventilation nozzle is installed on plugging plate and is connected protection gas, finally welding gun is arranged on to the precalculated position on protective cover,
Step 3, butt welding mouth region and welding wire carry out pickling, remove its surperficial oxide-film, until aobvious silvery white metallic luster; After pickling, clean acid solution and also with calico, dry, with acetone or alcohol wiping weld bond and welding wire again; Not weld zone on Butt welding gun moving direction, adopts sealant tape sealing, and the first breather pipe and protective cover is ventilated, and time 30s, gets rid of the air in the first breather pipe and protective cover;
Step 4, carries out welding operation, adopts leftward welding, torch neck is vertical with welded piece, tungsten electrode extension elongation and nozzle are little from weldment surface distance, to obtain gas shield effect, and the sealant tape of tearing gradually in the titanium alloy straight tube seam of welding gun the place ahead along with the movement of protective cover;
Step 5, after titanium alloy straight tube welding, naturally cooling 5min, unloads circular arc jig, screws out the copper sheathing at the first breather pipe two ends, takes out the first breather pipe and arc copper billet, unloads weld-end fittings;
Step 6, repeats above step 1 to step 5, carries out batch welding.
Claims (2)
1. the seam weld jig of a titanium alloy straight tube and seam welding method, it is characterized in that: comprise ventilation nozzle, plugging plate, copper sheathing, welding gun, protective cover, arc copper billet, the first breather pipe, circular arc jig, described the first breather pipe is cylindrical shape, there is external screw thread at two ends, in the first airway wall, there is vertically the identical circular hole of the equidistant diameter of two rows, plugging plate is positioned at the first breather pipe two ends, plugging plate external diameter is identical with the first breather pipe internal diameter, and be interference fit, wherein, there is ventilation nozzle installing hole at the plugging plate center of one end; On described arc copper billet, there is vertically the circular hole that the equidistant diameter of two rows is 2mm, the radian of arc copper billet is less than semi arch, arc copper billet is fixed on the first breather pipe, arc copper billet inner arc face and the first breather pipe lateral surface adopt seccotine laminating, two row's circular holes on arc copper billet two row's circular hole and the first breather pipe are measure-alike, and the circular hole on arc copper billet is coaxially corresponding one by one with the circular hole on the first breather pipe; Described copper sheathing is stairstepping cylindrical structure, and copper sheathing inner side has screw thread, two copper sheathings to be positioned at the first breather pipe two ends, and copper sheathing and the first breather pipe are threaded connection; Protective cover is positioned at middle part above arc copper billet, titanium alloy straight tube is arranged on fixture, the exterior arc surface of the face of cylinder and arc copper billet laminating inside titanium alloy straight tube, the weld seam of titanium alloy straight tube is positioned on the axial plane of symmetry of the row of two on arc copper billet circular hole, circular arc jig clamps titanium alloy straight tube, the inner arc face of circular arc jig and the laminating of the outer arc face of titanium alloy straight tube; Described protective cover comprises cover body, snap ring, the second breather pipe, copper mesh, high-temperature resistant rubber piece; welding gun is fixed on cover body by snap ring; cover body top has screw installation ventilation nozzle to be connected with the second breather pipe; on the second breather pipe, there are vertically a plurality of circular holes; copper mesh is between the second breather pipe and weld metal zone; high-temperature resistant rubber piece adopts seccotine to be connected in cover body two bottom sides and rear end face, and contacts cooperation with titanium alloy straight tube.
2. the seam weld jig of employing titanium alloy straight tube claimed in claim 1 carries out a seam welding method for titanium alloy straight tube, it is characterized in that comprising the following steps:
Step 1, determine the size of the arc copper billet of weld jig, according to the internal diameter of titanium alloy straight tube to be welded and length dimension, determine the size of arc copper billet, the global facility that arc copper billet and the first breather pipe form radially size is less than the internal diameter of titanium alloy straight tube, guarantees that arc copper billet and the global facility of the first breather pipe composition take out in titanium alloy straight tube from welding;
Step 2, adopt seccotine that arc copper billet is connected on the first breather pipe, and two row's circular hole centering accurate positionings on two row's circular holes on assurance arc copper billet and the first breather pipe, two plugging plates are arranged on the first breather pipe, arc copper billet and the first breather pipe integral body are placed in titanium alloy straight tube, and copper sheathing is screwed into respectively to precalculated position from the first breather pipe two ends, at copper sheathing, contacting end face with titanium alloy straight tube seals with sealant tape, titanium alloy straight tube is clamped with circular arc jig, ventilation nozzle is installed on plugging plate and is connected protection gas, finally welding gun is arranged on to the precalculated position on protective cover,
Step 3, butt welding mouth region and welding wire carry out pickling, remove its surperficial oxide-film, until aobvious silvery white metallic luster; After pickling, clean acid solution and also with calico, dry, with acetone or alcohol wiping weld bond and welding wire again; Not weld zone on Butt welding gun moving direction, adopts sealant tape sealing, and the first breather pipe and protective cover is ventilated, and time 30s, gets rid of the air in the first breather pipe and protective cover;
Step 4, carries out welding operation, adopts leftward welding, torch neck is vertical with welded piece, tungsten electrode extension elongation and nozzle are little from weldment surface distance, to obtain gas shield effect, and the sealant tape of tearing gradually in the titanium alloy straight tube seam of welding gun the place ahead along with the movement of protective cover;
Step 5, after titanium alloy straight tube welding, naturally cooling 5min, unloads circular arc jig, screws out the copper sheathing at the first breather pipe two ends, takes out the first breather pipe and arc copper billet, unloads weld-end fittings;
Step 6, repeats above-mentioned steps 1 to step 5, carries out batch welding.
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| CN104439636A (en) * | 2014-11-14 | 2015-03-25 | 中航飞机股份有限公司西安飞机分公司 | Titanium alloy part welding protecting method |
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