CN106342012B - The agitating friction welding Apparatus for () and method therefor of tube structure - Google Patents
The agitating friction welding Apparatus for () and method therefor of tube structureInfo
- Publication number
- CN106342012B CN106342012B CN200610120831.8A CN200610120831A CN106342012B CN 106342012 B CN106342012 B CN 106342012B CN 200610120831 A CN200610120831 A CN 200610120831A CN 106342012 B CN106342012 B CN 106342012B
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- China
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- welding
- main shaft
- stirring
- head
- tube structure
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Abstract
The agitating friction welding equipment that the invention discloses a kind of rocket fuel tank cylindrical shell, comprising: be fixed on outer column and inner column on base; Their upper surface is connected or is unclamped by pneuma-lock mechanism; Weld jig and transmission mechanism are installed on inner column; Welding main shaft is installed on transmission mechanism; On welding main shaft, stirring-head is installed, welding main shaft can move along inner column is upper and lower by transmission mechanism; Welding main shaft is connected with main shaft pedestal by guide rail, can move along major axes orientation; Welding main shaft and main shaft pedestal can together with move in the vertical direction along guide rail; Outer column is fixed with composition backing; Around base, also by auxiliary strut, several servicing units are installed. The invention also discloses the welding method of this welding equipment. The present invention has significantly improved joint performance and the production efficiency of tube structure, has reduced the incidence of weld defect.
Description
Technical field
The present invention relates to agitating friction welding, especially rocket fuel tank aluminium alloy cylindrical body class partA kind of vertical mixing friction welding apparatus, the invention still further relates to the agitating friction welding of cylindrical shell series productsMethod.
Background technology
In order to reach the object of welding, most of welding methods all will or be pressurizeed by means of heating,Or heat simultaneously, pressurize, to realize atom combination. Gas welding, carbon dioxide arc welding, electricity that picture is commonIt is all to adopt direct heat source that the weldering of son bundle waits, and METAL HEATING PROCESS to be welded, to fusing, is reached to former after then solidifyingCombination between son.
The friction stir welding the present invention relates to is that a kind of solid phase that there is no fusing connects, and weldsIn journey, there is not material melting phenomenon. Its operation principle is: make to treat welder by the pressure of frock clampThe surperficial close contact of part, then makes metal be heated to very high temperature with stirring-head frictional heat(but lower than fusing point), under the turning effort of stirring-head, by the stirring at weld, mixing,Diffusion, finally forms firmly joint.
Known agitating friction soldering equipment comprises frock clamp and stirring-head, and the end of stirring-head is straightThe mixing needle that footpath is smaller, is deep into the depths of soldering part, is that diameter is larger after mixing needleThe shaft shoulder, for the agitating friction on weld surface. Friction stir welding can be realized aluminium alloy, magnesium alloyOr welding of other difficult weldering aluminum alloy materials, rocket fuel tank may adopt in the future some be difficult toThe material of welding, as the welding of aluminum-copper-lithium alloys etc. Therefore, friction stir welding is a solid-state connectionProcess, does not have arc light, electromagnetic radiation, does not consume welding wire, solder flux etc. in welding process, be a kind of greenThe new welding technology that colour circle is protected.
At present, domestic aerospace craft combust aluminium alloy cylinder tank adopts fusion welding method more, welding.After the likelihood ratio that occurs of lower, the weld defect of joint performance higher, technique is more loaded down with trivial details simultaneously,Need cleaning, surface treatment etc., the production cycle is long.
Summary of the invention
In order to solve, the cylindrical shell series products property of welded joints such as existing fuel tank are low, weld defect occursProbability is compared with the deficiency in high-technology, and the first aspect of the object of the invention is to provide a kind of tube structureVertical mixing friction welding apparatus. Utilize the present invention, not only reach the requirement of welding quality, andBe applicable to length, the larger barrel soldering of welding difficulty of needles of various sizes. In order to solve prior art notFoot, the object of the invention on the other hand, also provides a kind of agitating friction welding equipment of tube structureWelding method.
In order to reach foregoing invention object, a first aspect of the present invention, is adopted by solving its technical problemWith technical scheme be to provide a kind of agitating friction welding equipment of tube structure, this device comprises:
Outer column and inner column, be fixed on base successively by lower end from outside to inside, outer column with inThe upper surface of column has the pneuma-lock mechanism that can connect or unclamp; Weld clip is installed on inner columnTool and transmission mechanism; Welding main shaft is installed on transmission mechanism; On welding main shaft, stirring-head is installed,Its end is the smaller mixing needle of diameter, is the shaft shoulder that diameter is larger in mixing needle below.Welding main shaft can move along inner column is upper and lower by transmission mechanism, realizes part from top to bottom or oneselfLower and on welding; Welding main shaft is connected with main shaft pedestal by guide rail, can, along major axes orientation, establishStandby Z-direction motion; On outer column, be screwed composition backing is installed; On composition backing, layThere is removable supporting steel plate; Supporting steel plate and weld jig are for clamping two parts to be welded; ?Tool setting gauge is installed on outer column, and tool setting gauge is a little less than composition backing, tool setting gauge surface and composition backingWeld seam support zone on same vertical plane; Air bag is installed on weld jig, at air bagOutside is provided with key pressing plate; Upper surface at key pressing plate is provided with spring, the other end of spring withWeld jig is connected.
Around base, also by auxiliary strut, several servicing units are installed; This device comprises:Travelling table, on it, be provided with two relatively near activity pinch rollers, two pinch rollers are usedIn welded part is compressed, and by rotariling actuate part rotation, mobile welding post; At auxiliary dressPut the handwheel that adjusting travelling table position is installed on pedestal. Servicing unit is treated for clamping and supportEach arc section of weldering part, the support of part during as assembling and welding. Its quantity is with circular arc to be weldedThe quantity of section equates.
In order to reach foregoing invention object, a second aspect of the present invention, is adopted by solving its technical problemWith technical scheme be to provide the welding method of a kind of tube structure agitating friction welding equipment, the methodComprise following step:
(a) segmental arc to be welded of cylindrical shell is put on servicing unit, by being positioned at around equipment and to be weldedSeveral servicing units of segmental arc equivalent amount are realized the support of part to be welded;
(b) one end straight line of two tube structure segmental arcs to be welded is placed in to inner column and outer columnBetween, stirring-head is fixed on welding main shaft, and makes the straight line of above-mentioned two tube structure segmental arcsWith stirring-head axial alignment;
(c) clamp and be fixedly placed between inner column and outer column with weld jig and composition backing and treatTwo straight lines of two tube structure segmental arcs of weldering;
(d) drive welding main shaft to make stirring-head approach outer column, when stirring-head and tool setting gauge surface connectWhile touching, the indicator lamp of tool setting gauge is bright, welding main spindle's now of record, and stirring-head is penetrated treatThe thickness of weldering arc section has the pre-allowance of 0.05～0.2mm;
(e) mobile stirring-head, to weld start position, starts stirring-head rotation, and passes through driverStructure drives welding main shaft to move forward, arrive to specify and penetrates position, then makes to weld main shaft along Vertical SquareWeld together being placed in two straight lines that form cylindrical shell between inside and outside column to motion;
(f) after welding, unclamp retaining mechanism, formed cylinder body is taken out by equipment top, cutExcept the allowance including welding uropore.
The agitating friction welding Apparatus for () and method therefor of tube structure of the present invention is owing to adopting vertical structure to establishMeter, therefore, can reduce the space requirement of equipment to factory building, has eliminated the weight of welding main shaft simultaneouslyTo the adverse effect of welding process. The present invention can realize LF6 (5A06), LD10 (2A14) withAnd the manufacture of the tube structure made of the aluminum alloy materials such as LY19 (2219), many by tube structureIndividual segmental arc is welded into cylindrical member by the agitating friction solder technology of environmental protection. Than former manufacture method,The present invention can significantly improve production efficiency, the joint performance of tube structure, and reduces defect incidence.The beneficial effect such as obtained the shortening aerospace craft lead time, improve the quality of products.
Brief description of the drawings
Fig. 1 is the agitating friction welding equipment of tube structure of the present invention and the structural representation of servicing unitFigure, wherein, the side view that Figure 1A is equipment; Figure 1B is the sectional top view of equipment;
Fig. 2 is the structural representation of present device middle auxiliary device;
Fig. 3 is the tool setting process schematic diagram that welding starts front welding starting point;
Fig. 4 is the top view of welding region part;
Fig. 5 illustrates application of the present invention, the schematic diagram that barrel soldering is forward and backward.
Detailed description of the invention
The agitating friction welding Apparatus for () and method therefor of tube structure of the present invention is mainly used in rocket fuelThe welding of tank cylindrical shell, part to be welded has the arc section that multistage diameter is identical conventionally. Two arc sections itBetween straight line adopt in the present invention friction stir welding to be welded. Fig. 5 illustrates of the present invention answeringWith, the schematic diagram that barrel soldering is forward and backward. In figure, the left side is the segmental arc of composition cylindrical shell, and the right is willThe cylindrical shell that multiple segmental arc soldering group install. Before welding, the establishing of the Length Ratio practical structures of arc sectionThe slightly long 30～60mm of meter length. The arc section that forms rocket fuel tank cylindrical shell can be that LF6 aluminium closesGold is made, and can be also that LD10 or LY19 aluminium alloy are made.
Below in conjunction with drawings and Examples to a first aspect of the present invention, the agitating friction of tube structureWelding equipment is described in further detail.
Fig. 1 is the agitating friction welding equipment of tube structure of the present invention and the structural representation of servicing unitFigure, wherein, the side view that Figure 1A is equipment; Figure 1B is equipment sectional top view; Fig. 3 is weldingThe tool setting process schematic diagram of welding starting point before starting; Fig. 4 is the top view of welding region part.
The dash number of described equipment is: inner column 1, outer column 2, base 3, servicing unit 4,Pneuma-lock mechanism 5, part to be welded 6, weld jig 7, transmission mechanism 8, guide rail 9, welding masterAxle 10, main shaft pedestal 11, tool setting gauge 12, stirring-head 13, mixing needle 13A, shaft shoulder 13B,Support steel plate 14, composition backing 15, air bag 16, key pressing plate 17, spring 18.
As shown in Fig. 1, Fig. 3 or Fig. 4, the assembly relation of this device is as follows: outer column 2 is with interior verticalThe lower end of post 1 is fixed on base 3 from outside to inside successively by screw, when welding, and inner column 1Link together by pneuma-lock mechanism 5 with the upper surface of outer column 2, to increase equipment rigidity;After welding, above-mentioned retaining mechanism 5 can unclamp, so that the taking-up of postwelding workpiece. Peace on inner column 1Weld jig 7 and transmission mechanism 8 are housed; Welding main shaft 10 is installed on transmission mechanism 8; Welding is mainStirring-head 13 is installed on axle 10, and its end is the smaller mixing needle 13A of diameter, is stirringAfter pin, be the shaft shoulder 13B (seeing Fig. 3) that diameter is larger. Welding main shaft 10 passes through transmission mechanism8 can move along inner column 1 is upper and lower, realize part welding or from bottom to top from top to bottom; WelderingConnect main shaft 10 and be connected with main shaft pedestal 11 by guide rail 9, can be along major axes orientation (equipment Z-direction)Motion, with in the time that welding process starts, control stirring-head 13 penetrates treats weldment seam; WeldingWhen journey finishes, also can control stirring-head 13 rollbacks; On outer column 2, be screwed welding is installedBacking plate 15; On composition backing 15, be equipped with removable supporting steel plate 14; Supporting steel plate 14 and welderingWelding fixture 7 clamps two parts 6 to be welded (seeing 6a and 6b in Fig. 4); On outer column 2, installHave tool setting gauge 12 (seeing Fig. 3), tool setting gauge 12 is a little less than composition backing 15, tool setting gauge 12 surfaces withThe weld seam support zone of composition backing 15 is on same vertical plane; On weld jig 7, be provided withAir bag 16 (seeing Fig. 4), is provided with key pressing plate 17 in the outside of weld jig 7 upper gasbags 16;At the upper surface of key pressing plate 17, spring 18 is installed, the other end of spring 18 and weld jig 7Be connected. When welding, air bag 16 is opened, and key pressing plate 17 is depressed, key pressing plate 17 front endsRoller bearing is pressed onto compressing component on piece surface. The stirring-head 13 being installed on welding main shaft 10 is weldingUnder the drive of main shaft 10, realize the welding of part. After welding, air bag 16 unclamps, at springUnder 18 pulling force effect, key pressing plate 17 homings, part is in free state. At this moment, pineOpen locking device 5, can take out the workpiece of welding from equipment top.
The arc of the composition backing 15 at two straight line back sides of above-mentioned rocket fuel tank cylindrical shell to be weldedSpend identical or smaller with the radian of rocket fuel tank cylindrical shell. When assembling, cylindrical shell arc section is filled piecemealBe fitted between servicing unit 4 and inner column 1 and outer column 2. One end of arc section is placed in servicing unitOn 4, the straight line of the other end is placed in equipment the axial alignment with stirring-head 13, then with establishingStandby upper weld jig 7 and composition backing 15 are by cylindrical shell arc section and the back of two parts 6 to be weldedThe cambered surface of composition backing 15 is sturdy (basic gapless) closely. As can be seen from Figure 3, welding main shaft10 can be along major axes orientation (equipment Z-direction) motion, to control (the weldering that penetrates of stirring-head by guide rail 9Termination process starts) and rollback (welding process finishes); Welding main shaft 10 and main shaft pedestal 11 can oneRise and make movement in vertical direction along transmission mechanism 8, realize welding or from bottom to top from top to bottom.
Around base 3, also by auxiliary strut, several servicing units 4 are installed. Servicing unit4 for clamping and support each arc section of part to be welded, and during as assembling and welding, part 6 props upSupport. But do not affect movement and the change of when assembling soldering part station, do not affect after welding zero yetThe taking-up of part (rocket fuel tank cylindrical shell). Its quantity is pressed the quantity of arc section and is determined, and the present invention is realThe arc section to be welded of executing example is four, therefore servicing unit 4 is four.
Fig. 2 is the structural representation of above-mentioned servicing unit 4, comprising: travelling table 42, and on itBe provided with two relatively, near 43 and 44, two pinch rollers of activity pinch rollers for will be byWeldering part compresses, and by rotariling actuate part rotation, mobile welding post; At servicing unit pedestalOn handwheel 41 is installed, adjust handwheel can realize moving forward and backward of workbench 42, thereby can realizeThe assemble welding of different-diameter (as φ 2900mm and φ 3350mm) part.
Further the course of work of the present invention is described below.
Fig. 3 is the tool setting process that welding starts front welding starting point, completes after assembling, by stirring-head13 are fixed on welding main shaft 10, and measure stirring-head by tool setting gauge 12 and weld to weld seam backThe distance of backing plate 15, then inserts stirring-head 13 rotation limits, limit the straight line of arc section to be welded. RightThe weld seam support zone of cutter instrument 12 surfaces and composition backing 15 is on same vertical plane. In order to ensure welderingStirring-head 13 in termination process (13A is mixing needle, and 13B is the shaft shoulder) does not penetrate part and pricks on backing plate and damageEvil composition backing 15 surfaces need to be supported stirring-head 13 and composition backing 15 before welding startsThe distance at position is measured. In the time of stirring-head 13 and tool setting gauge 12 Surface Contact, tool setting gauge 12Indicator lamp can be light. Stirring-head is inserted into after assigned address, does not penetrate the whole thick of arc sectionDegree, but has certain pre-allowance (0.05～0.2mm), passable by controlling the variation of pre-allowanceReach the object of controlling welding quality. Stirring-head stops 4～10 after arriving assigned address (degree of depth)Can start welding second along welding direction. In welding process, rely on the High Rotation Speed of stirring-head,And the fricative frictional heat between arc section to be welded and plastic deformation are by two of arc section to be weldedIndividual straight line welds together.
Fig. 4 is the top view of welding region part. As shown in the figure, composition backing 15 center support portionsPosition is removable supporting steel plate 14, because after welding a period of time, there are wearing and tearing on supporting steel plate surfaceOr local deformation, when more serious, can change. Two parts (arc section 6a and 6b) dress to be weldedBe fitted on behind position, air bag 16 is opened, and key pressing plate 17 is depressed, and key pressing plate 17 front end roller bearings are pressedTo compressing component on piece surface. The stirring-head 13 being installed on welding main shaft 10 can be main in weldingUnder the drive of axle 10, realize the welding of part. After welding, air bag 16 unclamps, at spring 18Under pulling force effect, key pressing plate 17 homings. After welding, the retaining mechanism on equipment is beatenOpen, thus maintenance equipment open wide, then the part of postwelding is taken out from equipment and servicing unit.
The present invention adopts a kind of vertical agitating friction welding equipment to solve conventional melting welding, i.e. tungsten electrode argonThe unweldable problem of the welding methods such as arc-welding, its vertical structure has ensured the weight of welding main shaft own notEffect in welded joints, has been eliminated the welding main shaft adverse effect that may cause welding process of conducting oneself with dignity; AndAnd the structure of growing for weld seam, can effectively reduce the floor space of equipment in factory building. The present inventionBe particularly useful for LF6 (5A06), LD10 (2A14) or LY19 (2219) aluminum alloy materials,Comprise the aluminum alloy materials of difficult weldering, rocket fuel tank may adopt in the future some be difficult to weldingMaterial, as aluminum-copper-lithium alloys etc., the arc section of making is welded into longer tube structure.
To a second aspect of the present invention, above-mentioned tube structure agitating friction welds the welding of equipment belowMethod is described in further detail. The method comprises following step:
(a) segmental arc to be welded of cylindrical shell is put on servicing unit, by being positioned at around equipment and to be weldedSeveral servicing units of segmental arc equivalent amount are realized the support of part to be welded;
(b) one end straight line of two tube structure segmental arcs to be welded is placed in to inner column and outer columnBetween, stirring-head is fixed on welding main shaft, and makes the straight line of above-mentioned two tube structure segmental arcsWith stirring-head axial alignment;
(c) clamp and be fixedly placed between inner column and outer column with weld jig and composition backing and treatTwo straight lines of two tube structure segmental arcs of weldering;
(d) complete after above-mentioned assembling, weld starting point tool setting, drive welding main shaft to make to stirHead approaches outer column, and in the time of stirring-head and tool setting gauge Surface Contact, the indicator lamp of tool setting gauge is bright, recordWelding main spindle's now, and arrange than the actual (real) thickness of part to be welded reduce 0.05～0.2mm doFor the maximum of stirring-head penetrates the degree of depth, penetrates position as the appointment of stirring-head;
(e) mobile stirring-head, to weld start position, starts stirring-head rotation, and passes through driverStructure drives welding main shaft to move forward, arrive to specify and penetrates position, then makes to weld main shaft along Vertical SquareWeld together being placed in two straight lines that form cylindrical shell between inside and outside column to motion;
(f) after welding, unclamp retaining mechanism, formed cylinder body is taken out by equipment top, cutExcept welding uropore is at interior allowance.
Claims (5)
1. the agitating friction of a tube structure welding equipment, comprise frock clamp, by mixing needle andThe stirring-head of shaft shoulder composition; It is characterized in that, described frock clamp comprises: outer column [2] withInner column [1], their lower end is fixed on base [3] from outside to inside successively by screw; OutwardColumn [2] has the pneuma-lock mechanism [5] that can be connected or unclamp with the upper surface of inner column [1];Weld jig [7] and transmission mechanism [8] are installed on inner column [1]; On transmission mechanism [8]Welding main shaft [10] is installed; On welding main shaft [10], stirring-head [13] is installed; Welding main shaft[10] pass through transmission mechanism [8] along the upper and lower motion of inner column [1]; Welding main shaft [10] is logicalCross guide rail [9] and be connected with main shaft pedestal [11], along major axes orientation, i.e. equipment Z-direction motion; OutwardOn column [2], be screwed composition backing [15] is installed; Composition backing is equipped with on [15]Removable supporting steel plate [14]; Supporting steel plate [14] and two of weld jig [7] clampings are to be weldedPart [6]; Tool setting gauge [12] is installed on outer column [2], and tool setting gauge [12] is a little less than welderingConnection pad plate [15], the weld seam support zone of tool setting gauge [12] surface and composition backing [15] inOn same vertical plane; Air bag [16] is installed on weld jig [7], outside air bag [16]Side is provided with key pressing plate [17]; At the upper surface of key pressing plate [17], spring [18] is installed;The other end of spring [18] is connected with weld jig [7];
Around base [3], by auxiliary strut, several servicing units [4] are installed; This dressPut and comprise: travelling table [42], on it, be provided with two relatively near activity pinch rollers[43,44]; The handwheel that regulates travelling table [42] position is installed on servicing unit pedestal
[41]。
2. according to the agitating friction welding equipment of the tube structure described in claims 1, its featureBe: the radian of described composition backing [15] is identical or smaller with cylindrical shell radian to be welded.
3. according to the agitating friction welding equipment of the tube structure described in claims 1, its featureBe: the quantity of described servicing unit [4] equates with the quantity of arc section to be welded.
4. the weldering of the welding of the agitating friction according to the tube structure described in claims 1 equipmentConnect method, it is characterized in that, the method comprises the steps:
(a) segmental arc to be welded of cylindrical shell is put on servicing unit, by being positioned at around equipment and to be weldedSeveral servicing units of segmental arc equivalent amount are realized the support of part to be welded;
(b) one end straight line of two tube structure segmental arcs to be welded is placed in to inner column and outer columnBetween, stirring-head is fixed on welding main shaft, and makes the straight line of above-mentioned two tube structure segmental arcsWith stirring-head axial alignment;
(c) clamp and be fixedly placed between inner column and outer column with weld jig and composition backing and treatTwo straight lines of two tube structure segmental arcs of weldering;
(d) drive welding main shaft to make stirring-head approach outer column, when stirring-head and tool setting gauge surface connectWhile touching, the indicator lamp of tool setting gauge is bright, record welding main spindle's now, and arrange than part to be weldedActual (real) thickness reduce 0.05～0.2mm and penetrate the degree of depth as the maximum of stirring-head;
(e) mobile stirring-head, to weld start position, starts stirring-head rotation, and passes through driverStructure drives welding main shaft to move forward, arrive to specify and penetrates position, then makes to weld main shaft along Vertical SquareTo motion, weld together being placed in two straight lines that form cylindrical shell between inside and outside column;
(f) after welding, unclamp retaining mechanism, formed cylinder body is taken out by equipment top, cutExcept the allowance including welding uropore.
5. according to the welding method described in claims 5, it is characterized in that described segmental arc to be weldedThe slightly long 30～60mm of Length Ratio practical structures, arc section adopts LF6, LD10 or LY19 aluminium alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610120831.8A CN106342012B (en) | 2006-12-25 | The agitating friction welding Apparatus for () and method therefor of tube structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610120831.8A CN106342012B (en) | 2006-12-25 | The agitating friction welding Apparatus for () and method therefor of tube structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106342012C CN106342012C (en) | 2009-07-01 |
| CN106342012B true CN106342012B (en) | 2009-07-01 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107570860A (en) * | 2017-09-04 | 2018-01-12 | 首都航天机械公司 | One kind is used for the vertical assembling docking longitudinal seam welder of arc wallboard |
| CN116213913A (en) * | 2021-12-02 | 2023-06-06 | 北京赛福斯特技术有限公司 | Rocket tank longitudinal joint friction stir welding clamping device |
| CN116475634B (en) * | 2023-04-27 | 2023-11-21 | 佛山市明焱科技有限公司 | Automatic ring welding equipment and ring preparation method |
| CN111659999B (en) * | 2020-05-20 | 2024-04-30 | 江苏锐成机械有限公司 | Welding support device for friction stir welding of longitudinal seam of barrel section |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107570860A (en) * | 2017-09-04 | 2018-01-12 | 首都航天机械公司 | One kind is used for the vertical assembling docking longitudinal seam welder of arc wallboard |
| CN107570860B (en) * | 2017-09-04 | 2019-07-12 | 首都航天机械公司 | One kind docking longitudinal seam welder for the vertical assembly of arc siding |
| CN111659999B (en) * | 2020-05-20 | 2024-04-30 | 江苏锐成机械有限公司 | Welding support device for friction stir welding of longitudinal seam of barrel section |
| CN116213913A (en) * | 2021-12-02 | 2023-06-06 | 北京赛福斯特技术有限公司 | Rocket tank longitudinal joint friction stir welding clamping device |
| CN116213913B (en) * | 2021-12-02 | 2024-03-22 | 北京赛福斯特技术有限公司 | Rocket tank longitudinal joint friction stir welding clamping device |
| CN116475634B (en) * | 2023-04-27 | 2023-11-21 | 佛山市明焱科技有限公司 | Automatic ring welding equipment and ring preparation method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| DC01 | Secret patent status has been lifted | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090701 Termination date: 20191225 |