CN106624278B - A kind of change wall thickness aluminium welding method - Google Patents
A kind of change wall thickness aluminium welding method Download PDFInfo
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- CN106624278B CN106624278B CN201611217359.XA CN201611217359A CN106624278B CN 106624278 B CN106624278 B CN 106624278B CN 201611217359 A CN201611217359 A CN 201611217359A CN 106624278 B CN106624278 B CN 106624278B
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- welding
- hexagon
- aluminium
- wall thickness
- hexagon pipe
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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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
- B23K9/0282—Seam welding; Backing means; Inserts for curved planar seams for welding tube sections
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
-
- 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
- B23K2103/10—Aluminium or alloys thereof
Abstract
The present invention provides a kind of change wall thickness aluminium welding method, step: aluminium weldment hexagon pipe (a) being carried out bevel processing, i.e., carries out mechanical bevel at six seamed edges of hexagon pipe respectively；(b) hexagon pipe is surface-treated, is then dried；(c) hexagon pipe and connector to be welded, Clamp for welding are assembled, carries out whole preheating after assembling before welding, Han Qian local preheating is carried out using welding arc；(d) implement welding, using Al-Si wire, welding condition is 120~160A of welding current, 5~15L/min of protective gas argon flow.The reasonable selection that the present invention passes through the parameters such as groove size design, welding wire selection, preweld cleaning method, preheating temperature, argon flow, reduce the generation of weld blowhole and microfissure, weld penetration is met the requirements simultaneously, weld seam reaches I grade of weld seam standard, to realize the aluminium alloy six angle pipes of wall thickness change and the argon arc welding of compromise joint.
Description
Technical field
The invention belongs to research and test reactor nuclear fuel element manufacturing technology fields, and in particular to a kind of change wall thickness aluminium-alloy pipe
With the welding technique of compromise joint.
Background technique
Existing aluminum alloy solder technology mainly for the sheet alloy, alloy pipe of equal wall thickness welding, and for becoming
The aluminium alloy pipe welding technique of wall thickness, has no relevant report.The chemical activity of LT24 aluminium alloy is very strong, and surface easily forms difficulty
Molten oxidation film (Al2O3Fusing point is 2050 DEG C, and MgO fusing point is 2500 DEG C), this series alloys thermal conductivity is strong in addition, when welding
It easily causes and does not fuse phenomenon.Due to the density of oxidation film and the similar density of aluminium, the field trash of weld metal is also easily become.Together
When, oxidation film (especially not bery fine and close oxidation film MgO), which can absorb more moisture, becomes the major reason of weld porosity.This
Outside, this series alloys thermal conductivity is with changing by force and at different temperature the solubility of hydrogen greatly, therefore is unfavorable for bubble
Emersion, it is easier to promote to form the welding defects such as stomata, micro-crack, carrying out become wall thickness LT24 aluminium alloy pipe material welding
When, due to the variation of material thickness, it will lead to the variation of local heating's situation He other welding conditions, stomata, micro- occurs in weld seam
Crackle, it is lack of penetration the defects of risk it is higher.
Summary of the invention
The present invention establishes a kind of LT24 alloyed aluminium variable wall thickness for the welding demand for becoming wall thickness six angle pipes and compromise joint
The welding method of six angle pipes and compromise joint solves the problems, such as to be easy to appear welding defect in welding process, ensure that welding
Quality.
Realize a kind of technical solution of the object of the invention: change wall thickness aluminium welding method, this method is by aluminium weldment hexagon
Pipe is connected with weld comprising following steps:
(a) aluminium weldment hexagon pipe is subjected to bevel processing, i.e., carries out machine at six seamed edges of hexagon pipe respectively
Tool bevel；
(b) hexagon pipe is surface-treated, to remove surface and oil contaminant and oxidation film；Then to six after surface treatment
Angular pipe is dried；
(c) hexagon pipe and connector to be welded, Clamp for welding are assembled, is carried out before welding after assembling whole
Preheating, 100~120 DEG C of preheating temperature, preheating time 45~60 minutes；
After the weldment integrally preheated is assembled, Han Qian local preheating is carried out using welding arc, arc current: 100~
120A, preheating time 10~20 minutes；
(d) implement welding, using Al-Si wire, gage of wire is 2~3mm of Ф；Welding condition is welding current 120
~160A, 5~15L/min of protective gas argon flow.
A kind of change wall thickness aluminium welding method as described above, described in hexagon pipe be square-outside and round-inside structure, wherein
Maximum in seamed edge sharp corner wall thickness, thickness is up to 6~7mm；Plane middle wall thickness is minimum, and thickness minimum 0.6~
1.5mm。
A kind of change wall thickness aluminium welding method as described above, described in welding plane transition be not arc transition, and
It is with the direct transition of hexagonal angle.
A kind of changes wall thickness aluminium welding method as described above, described in aluminium weldment hexagon pipe and connector be LT24 aluminium
Alloy or 6061 aluminium alloys.
A kind of changes wall thickness aluminium welding method as described above, described in step (b) to hexagon pipe progress surface at
Reason, is by alkali cleaning in 1~5 minute, pickling in 3~10 minutes to clear up weldment surface and oil contaminant and oxidation film；
A kind of change wall thickness aluminium welding method as described above, by the hexagon after surface treatment described in step (b)
Pipe is dried, and drying unit recycles drying box using FAR INFRARED HEATING air blast, and drying temperature is 100~120 DEG C, and the time is
20~40 minutes, drying mode was hot air circulation.
A kind of changes wall thickness aluminium welding method as described above, Clamp for welding described in step (c) is copper product, integrally
Form tubular construction, end is divided into three valves, and tubular construction inner surface is hexagon, and outer surface is pyramidal structure, by with rotation
Tooling is used cooperatively, and can hold weldment hexagon pipe tightly.
A kind of change wall thickness aluminium welding method as described above, in six seamed edges of hexagon pipe described in step (a)
Place carries out mechanical bevel, and groove size is (30~40) ° × (2~4) mm.
Effect of the invention is that:
The present invention is a kind of welding method for becoming wall thickness LT24 aluminium alloy six angle pipes and compromise joint, is set by groove size
The reasonable selection of the parameters such as meter, welding wire selection, preweld cleaning method, preheating temperature, argon flow reduces weld blowhole and microcosmic
The generation of crackle, while weld penetration is met the requirements, weld seam reaches I grade of weld seam standard, to realize the aluminium alloy of wall thickness change
The argon arc welding of six angle pipes and compromise joint.
The present invention eliminates such gauge material argon arc welding stomata, does not weld by selecting suitable combination of process parameters
Thoroughly, the welding defects such as crackle meet I grade of level weld seam requirement, realize the welding of LT24 aluminium alloy six angle pipes and heteromorphic connector, for member
Part development provides guarantee.
Detailed description of the invention
Fig. 1 is hexagon pipe structure sectional view；
Fig. 2 is Fig. 1 hexagon pipe side view；
Fig. 3 is Clamp for welding main view；
Fig. 4 is Fig. 3 Clamp for welding side view；
Fig. 5 is Fig. 3 Clamp for welding cross-sectional view；
Fig. 6 is bevel angle, scale diagrams；
Fig. 7 is weldment assembling schematic diagram.
In figure: 1. six angle pipes；2. compromise joint；3. Clamp for welding.
Specific embodiment
It is further to a kind of change wall thickness aluminium welding method work of the present invention in the following with reference to the drawings and specific embodiments
Description.
Embodiment 1
As shown in Fig. 1 and Fig. 2, hexagon pipe is square-outside and round-inside structure, wherein maximum in seamed edge sharp corner wall thickness, thickness is most
Greatly 6.4mm；Plane middle wall thickness is minimum, the minimum 1mm of thickness.
Hexagon pipe and connector are LT24 aluminium alloy, and hexagon pipe is connected with weld, and welding point deep-cycle becomes
To change, the depth of tab depth thinnest part is 1mm, and maximum is 6.4mm, and welding plane transition is not arc transition,
But with the direct transition of hexagonal angle, this structure brings very big difficulty to welding process.
Aluminium weldment hexagon pipe is connected with weld using a kind of change wall thickness aluminium welding method of the present invention,
It includes the following steps:
(a) aluminium weldment hexagon pipe is subjected to bevel processing, i.e., carries out machine at six seamed edges of hexagon pipe respectively
Tool bevel, as shown in fig. 6, groove size is 35 ° × 3mm.
(b) hexagon pipe is surface-treated, by alkali cleaning in 3 minutes, pickling in 6 minutes with clear up weldment surface and oil contaminant and
Oxidation film；Then the hexagon pipe after surface treatment is dried；Drying unit is dried using FAR INFRARED HEATING air blast circulation
Dry case, drying temperature are 110 DEG C, and the time is 30 minutes, and drying mode is hot air circulation.
(c) it as shown in fig. 7, hexagon pipe and connector to be welded, Clamp for welding are assembled, is being welded after assembling
The whole preheating of preceding progress, 110 DEG C of preheating temperature, preheating time 50 minutes；
After the weldment integrally preheated is assembled, Han Qian local preheating is carried out using welding arc, arc current: 110A,
Preheating time 15 minutes；
As shown in Figures 3 to 5, the Clamp for welding is copper product, and tubular construction is integrally formed, and end is divided into three valves,
Tubular construction inner surface is hexagon, and outer surface is pyramidal structure, by being used cooperatively with rotary tooling, can hold weldment hexagonal tightly
Shape pipe.
(d) implement welding, using Al-Si wire, gage of wire is Ф 2mm；Welding condition be welding current 140A,
Protective gas argon flow 15L/min.
Embodiment 2
As shown in Fig. 1 and Fig. 2, hexagon pipe is square-outside and round-inside structure, wherein maximum in seamed edge sharp corner wall thickness, thickness is most
Greatly 6mm；Plane middle wall thickness is minimum, the minimum 0.6mm of thickness.
Hexagon pipe and connector are 6061 aluminium alloys, and hexagon pipe is connected with weld, and welding plane transition is not round
Arc transition, but with the direct transition of hexagonal angle.
Aluminium weldment hexagon pipe is connected with weld using a kind of change wall thickness aluminium welding method of the present invention,
It includes the following steps:
(a) aluminium weldment hexagon pipe is subjected to bevel processing, i.e., carries out machine at six seamed edges of hexagon pipe respectively
Tool bevel, as shown in fig. 6, groove size is 30 ° × 2mm.
(b) hexagon pipe is surface-treated, by alkali cleaning in 1 minute, pickling in 3 minutes with clear up weldment surface and oil contaminant and
Oxidation film；Then the hexagon pipe after surface treatment is dried；Drying unit is dried using FAR INFRARED HEATING air blast circulation
Dry case, drying temperature are 100 DEG C, and the time is 40 minutes, and drying mode is hot air circulation.
(c) it as shown in fig. 7, hexagon pipe and connector to be welded, Clamp for welding are assembled, is being welded after assembling
The whole preheating of preceding progress, 100 DEG C of preheating temperature, preheating time 60 minutes；
After the weldment integrally preheated is assembled, Han Qian local preheating is carried out using welding arc, arc current: 100A,
Preheating time 20 minutes；
As shown in Figures 3 to 5, the Clamp for welding is copper product, and tubular construction is integrally formed, and end is divided into three valves,
Tubular construction inner surface is hexagon, and outer surface is pyramidal structure, by being used cooperatively with rotary tooling, can hold weldment hexagonal tightly
Shape pipe.
(d) implement welding, using Al-Si wire, gage of wire is Ф 3mm；Welding condition be welding current 120A,
Protective gas argon flow 5L/min.
Embodiment 3
As shown in Fig. 1 and Fig. 2, hexagon pipe is square-outside and round-inside structure, wherein maximum in seamed edge sharp corner wall thickness, thickness is most
Greatly 7mm；Plane middle wall thickness is minimum, the minimum 1.5mm of thickness.
Hexagon pipe and connector are LT24 aluminium alloy, and hexagon pipe is connected with weld comprising following steps:
(a) aluminium weldment hexagon pipe is subjected to bevel processing, i.e., carries out machine at six seamed edges of hexagon pipe respectively
Tool bevel, as shown in fig. 6, groove size is 40 ° × 4mm.
(b) hexagon pipe is surface-treated, by alkali cleaning in 5 minutes, pickling in 10 minutes to clear up weldment surface and oil contaminant
And oxidation film；Then the hexagon pipe after surface treatment is dried；Drying unit is recycled using FAR INFRARED HEATING air blast
Drying box, drying temperature are 120 DEG C, and the time is 20 minutes, and drying mode is hot air circulation.
(c) it as shown in fig. 7, hexagon pipe and connector to be welded, Clamp for welding are assembled, is being welded after assembling
The whole preheating of preceding progress, 120 DEG C of preheating temperature, preheating time 45 minutes；
After the weldment integrally preheated is assembled, Han Qian local preheating is carried out using welding arc, arc current: 120A,
Preheating time 10 minutes；
As shown in Figures 3 to 5, the Clamp for welding is copper product, and tubular construction is integrally formed, and end is divided into three valves,
Tubular construction inner surface is hexagon, and outer surface is pyramidal structure, by being used cooperatively with rotary tooling, can hold weldment hexagonal tightly
Shape pipe.
(d) implement welding, using Al-Si wire, gage of wire is Ф 3mm；Welding condition be welding current 160A,
Protective gas argon flow 10L/min.
The results such as weldment ray detection, metallographic detection are qualified after above-described embodiment 1~3 welds, and meet I grade of weld seam and want
It asks.
Claims (3)
1. a kind of change wall thickness aluminium welding method, aluminium weldment hexagon pipe is connected by this method with weld, which is characterized in that
This method comprises the following steps:
(a) aluminium weldment hexagon pipe is subjected to bevel processing, i.e., carries out machinery at six seamed edges of hexagon pipe respectively and opens
Groove；
The hexagon pipe is square-outside and round-inside structure, wherein maximum in seamed edge sharp corner wall thickness, thickness is up to 6~7mm；It is flat
Face middle wall thickness is minimum, the minimum 0.6~1.5mm of thickness；
Described to carry out mechanical bevel at six seamed edges of hexagon pipe, groove size is (30~40) ° × (2~4)
mm；
(b) hexagon pipe is surface-treated, to remove surface and oil contaminant and oxidation film；Then to the hexagon after surface treatment
Pipe is dried；
Described is surface-treated hexagon pipe, is by alkali cleaning in 1~5 minute, pickling in 3~10 minutes to clear up weldment table
Face greasy dirt and oxidation film；
Described dries the hexagon pipe after surface treatment, and drying unit is using FAR INFRARED HEATING air blast circulation drying
Case, drying temperature are 100~120 DEG C, and the time is 20~40 minutes, and drying mode is hot air circulation；
(c) hexagon pipe and connector to be welded, Clamp for welding are assembled, is carried out before welding after assembling whole pre-
Heat, 100~120 DEG C of preheating temperature, preheating time 45~60 minutes；
After the weldment integrally preheated is assembled, Han Qian local preheating is carried out using welding arc, arc current: 100~120A,
Preheating time 10~20 minutes；
(d) implement welding, using Al-Si wire, gage of wire is 2~3mm of Ф；Welding condition be welding current 120~
160A, 5~15L/min of protective gas argon flow.
2. a kind of change wall thickness aluminium welding method according to claim 1, it is characterised in that: the aluminium weldment hexagon
Pipe is LT24 aluminium alloy or 6061 aluminium alloys with connector.
3. a kind of change wall thickness aluminium welding method according to claim 1, it is characterised in that: welding described in step (c)
Fixture is copper product, and tubular construction is integrally formed, and end is divided into three valves, and tubular construction inner surface is hexagon, and outer surface is cone
Shape structure can hold weldment hexagon pipe tightly by being used cooperatively with rotary tooling.
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| CN201611217359.XA CN106624278B (en) | 2016-12-26 | 2016-12-26 | A kind of change wall thickness aluminium welding method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611217359.XA CN106624278B (en) | 2016-12-26 | 2016-12-26 | A kind of change wall thickness aluminium welding method |
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| CN106624278B true CN106624278B (en) | 2019-05-17 |
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| CN112846461B (en) * | 2021-02-19 | 2022-07-29 | 鞍钢集团北京研究院有限公司 | Welding method of polygonal structural member |
| CN114131201B (en) * | 2021-11-26 | 2022-09-20 | 华中科技大学 | Method, system and device for welding variable-thickness invar steel plate |
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| JP3572285B2 (en) * | 2001-11-19 | 2004-09-29 | 核燃料サイクル開発機構 | Wrapper tube with welded joint and method of manufacturing the same |
| CN101332529B (en) * | 2008-08-06 | 2011-01-12 | 中国原子能科学研究院 | Welding process of thin-wall hexagonal tube |
| CN104174978A (en) * | 2014-09-09 | 2014-12-03 | 青岛润鑫伟业科贸有限公司 | Argon tungsten-arc welding technology for aluminum alloy workpieces |
| CN104353923A (en) * | 2014-11-03 | 2015-02-18 | 衡阳风顺车桥有限公司 | Channel steel splicing-welding square pipe splicing-welding process |
| CN105773070A (en) * | 2014-12-26 | 2016-07-20 | 中核北方核燃料元件有限公司 | Machining process for high-precision thin-wall hexagonal square pipe |
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