CN107570859A - A kind of Magnesium Alloy in Friction Stir welding process method - Google Patents
A kind of Magnesium Alloy in Friction Stir welding process method Download PDFInfo
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- CN107570859A CN107570859A CN201710637539.1A CN201710637539A CN107570859A CN 107570859 A CN107570859 A CN 107570859A CN 201710637539 A CN201710637539 A CN 201710637539A CN 107570859 A CN107570859 A CN 107570859A
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- magnesium alloy
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- stir welding
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Abstract
The invention belongs to metal material agitating friction welding technique field, specially a kind of Magnesium Alloy in Friction Stir weldering welding procedure.First Mg alloy surface to be welded is cleaned with cleaning agent, degreased, and superficial oxidation skin is polished off with sand paper；Then magnesium alloy sample is fixed on agitating friction soldering equipment, it is necessary to assure clamp；Finally welded, welding condition is：Rotating speed is 1500 2250r/min, and weldering speed is 30 70mm/min, and top rake is 3 °, and shaft shoulder volume under pressure is 0.1mm, no offset.It is attractive in appearance that the method for the present invention can shape the stir friction welding seam of magnesium alloy, and shaft-like distribution, the mechanical properties such as fine microstructures are in uniformly are more excellent.Magnesium Alloy in Friction Stir plumb joint is set to reach engineer applied requirement.
Description
Technical field
The invention belongs to metal material agitating friction welding technique field, is related to a kind of improvement wrought magnesium alloy agitating friction
The method of plumb joint tissue and mechanical property.
Background technology
Agitating friction weldering (Friction stir welding-FSW) is by Britain's institute of welding (The welding
Institute-TWI) in a kind of new solid phase connecting method of invention in 1991, only rely on and welded in mechanical force and frictional heat
Connect.Because agitating friction weldering possesses incomparable advantage compared to Conventional attachment methods, the technology once appearance, just by
The extensive concern of industrial quarters has been arrived, and has been applied to industrial production in a short period of time, has turned into one and has much subversive connection
Technology.This technology changes the manufacturing process of high strength alumin ium alloy structure significantly, and is a systems such as magnesium alloy, copper alloy
The welding of row metal provides selectable method.In recent years, Friction stir welding technology is progressively have extensively studied both at home and abroad,
Its development is very rapid, and applicable field is also more and more, drastically increases the manufacturing technology in the world.
Magnesium and magnesium alloy are because with low-density, high specific strength, high specific stiffness, damping performance be good, anti-capability of electromagnetic shielding
Good, the various excellent specific properties such as cutting ability is good, and as structural material most light in current commercial Application, it is described as " 21
The green engineering material in century ", extremely meet current loss of weight, the requirement of energy-saving and environmental protection.With the hair of magnesium material processing refinement technique
Scarcity, the magnesium material increasingly of the nonferrous metal resource such as exhibition and copper, lead, zinc have become the 3rd class formation metal material, are only second to steel
Iron and aluminium.Quite varied effect is suffered from manufacturing industry various aspects, is especially subtracted in automobile loss of weight, damping, 3C Product
The weight various aspects such as radiation protection radiating, it is shown that it is irreplaceable, excellent the characteristics of.
Because magnesium alloy fusing point is low, the features such as thermal conductivity and linear expansion coefficient are big, and chemical property is vivaciously oxidizable so that magnesium
The weldability of alloy is poor, and a series of problem is easily produced in welding process.Subject matter has：Thermal conductivity is big, thermal source energy
Amount is easy to lost, therefore to use fusion welding method to weld, it is necessary to which, using high density thermal source, this has also resulted in weld metal zone and hot shadow
Ring the overheat and coarse grains of area's material；In welding process, because magnesium melting point metal and boiling point are all low, cause the gold of weld metal zone
Category material easily evaporates；Magnesium metal is extremely oxidized easily in itself, and magnesium is metal heated during welding, is more also easy to produce oxidation and forms fusing point
High magnesia, magnesia are difficult to clean off just resting in weld seam, turn into and be mingled with, under making the mechanical property of welding point significantly
Drop；The thermal coefficient of expansion of magnesium metal is larger, easily occurs welding deformation in welding process, causes big thermal stress；Magnesium metal
Density it is small, the density difference of hydrogen and metal is smaller, is not easy to escape in weld seam molten bath, results in gas hole defect.
At present, magnesium alloy plate mainly realizes connection by welding (MIG welderings) and riveting.But
It is the defects of welding (MIG welderings) easily causes coarse grains, stomata and fire check, joint quality is not high.
And the strength of joint riveted is low, be not suitable for the connection of structural member.In recent years, the high energy welding method such as Laser Welding was studied
And application, but because it easily produces the defects of weld seam is stayed when welding, and welding equipment is costly, is not made extensively
With.Agitating friction weldering has high quality, efficient connection feature, and artificially do as a kind of new solid-state bonding process
It is few to disturb factor, automaticity is high, and an effective scheme is provided for the welding of alloy in lightweight.At present, agitating friction weldering skill
Art has been realized in the welding of a series of welding of alloy in lightweight such as aluminium alloy, even dissimilar metal, there is wide application
Prospect, the active development research of many industrial circles, especially aerospace field are obtained, it is rendered in aluminium alloy connection
Go out the trend that large area replaces fusion welding method.In the research of Friction stir welding technology, domestic and international primary study is welded
Material is mostly focused on aluminium alloy, and studies Magnesium Alloy in Friction Stir Welding on a small quantity, also focuses primarily upon cast magnesium alloy,
Then less compared to the wrought magnesium alloy research of more difficult weldering, this severely limits the application of wrought magnesium alloy.
The content of the invention
In order to overcome the shortcomings of in background technology, patent of the present invention proposes a kind of improvement wrought magnesium alloy agitating friction weldering
The method of rear joint microstructure and mechanical property, heat input is rationally controlled by Optimizing Process Parameters, connecing for fine microstructures can be obtained
Head, good mechanical performance.
It is an object of the invention to problem and shortage be present for above-mentioned, a kind of improvement wrought magnesium alloy agitating friction is proposed
The process of plumb joint tissue, performance, the process can make the shaping of wrought magnesium alloy stir friction welding seam attractive in appearance, tissue
Fine uniform, excellent in mechanical performance, wrought magnesium alloy friction stir welding is set to meet engineer applied requirement.
Technical scheme described in patent of the present invention is as follows:
A kind of magnesium alloy welding technique, it is characterised in that described Friction stir welding step is followed successively by：
(1) before welding, cleaning is carried out to the solder side of magnesium alloy using alcohol and acetone and removes degreasing；And with sand paper by portion to be welded
The oxide skin of position cleans out.
(2) sample cleaned out is fixed on agitating friction soldering equipment, it is necessary to assure clamp.
(3) magnesium alloy plate is welded.
Step (1) magnesium alloy is AZ91D wrought magnesium alloys, sheet metal thickness 4mm.
Step (3) Friction stir welding parameter：Rotating speed is 1500-2300r/min, weldering speed 30-70mm/min, is leaned forward
Angle is 3 °, and shaft shoulder volume under pressure is 0.1mm, no offset.
Round table-like mixing needle, top end diameter 4mm, root diameter (RD) 6mm are selected, mixing needle length is 3.8mm, and the shaft shoulder is straight
Footpath is 16mm, and stirring-head material is stainless steel.
The beneficial effects of the invention are as follows：The wrought magnesium alloy welding procedure of the present invention, degreasing, oxidation can be removed before welding
Film, it is easy to fusion during welding, improves welding effect, in the state of technological parameter stability contorting, it is uniform fine microstructures can be obtained
Tissue, joint mechanical property is good, and technique is simple, easily realize, have a good application prospect.
Brief description of the drawings
Fig. 1 is that Magnesium Alloy in Friction Stir welds schematic diagram.
Fig. 2 is Magnesium Alloy in Friction Stir joint cross-sectional view.
Fig. 3 is Magnesium Alloy in Friction Stir plumb joint micro-organization chart.
Fig. 4 is Magnesium Alloy in Friction Stir plumb joint stretching fracture scanning figure.
Embodiment
It is the specific embodiment that inventor provides below, patent of the present invention is not limited to these embodiments.
Embodiment 1
Friction stir welding method is used to weld wrought magnesium alloy AZ91D plate of two pieces of thickness as 4.0mm using docking mode
Material, round table-like mixing needle, top end diameter 4mm, root diameter (RD) 6mm are selected, mixing needle length is 3.8mm, and the shaft shoulder is a diameter of
16mm, stirring-head material are stainless steel.When speed of welding is 40mm/min, and Rotating speed is 1700r/min, weld seam
Shaping is good (as shown in Figure 2 a), nugget district's groups knit fine uniform in etc. shaft-like distribution (as shown in Figure 3 a), joint obtained by postwelding
Tensile strength be 214Mpa, reached the 85.6% of strength of parent.Welding point tensile sample is broken in heat-mechanical affected zone, is broken
Mouth also has depression and micro- hole, is quasi-cleavage crack in addition in fibrous morphology and with the presence of a certain amount of cleavage step on section
With the mixing (as shown in fig. 4 a) of ductile rupture.
Embodiment 2
Friction stir welding method is used to weld wrought magnesium alloy AZ91D plate of two pieces of thickness as 4.0mm using docking mode
Material, round table-like mixing needle, top end diameter 4mm, root diameter (RD) 6mm are selected, mixing needle length is 3.8mm, and the shaft shoulder is a diameter of
16mm, stirring-head material are stainless steel.When speed of welding is 50mm/min, and Rotating speed is 2250r/min, weld seam
Shaping is good (as shown in Figure 2 b), nugget district's groups knit fine uniform in etc. shaft-like distribution (as shown in Figure 3 b), joint obtained by postwelding
Tensile strength be 226Mpa, reached the 90.4% of strength of parent.Welding point tensile sample is broken in heat-mechanical affected zone, is broken
Mouth also has depression and micro- hole, is quasi-cleavage crack in addition in fibrous morphology and with the presence of a certain amount of cleavage step on section
With the mixing (as shown in Figure 4 b) of ductile rupture.
Claims (4)
1. a kind of Magnesium Alloy in Friction Stir welding process method, heat input is rationally controlled by Optimizing Process Parameters, it is thin to obtain tissue
Small joint, good mechanical performance, it is characterised in that the magnesium alloy sample cleaned out is fixed to agitating friction soldering equipment
On, magnesium alloy plate is welded after clamping；Friction stir welding parameter is：Rotating speed is 1500-2300r/min, weldering speed
For 30-70mm/min, top rake is 3 °, and shaft shoulder volume under pressure is 0.1mm, no offset.
A kind of 2. Magnesium Alloy in Friction Stir welding process method according to claim 1, it is characterised in that：The magnesium alloy is
AZ91D wrought magnesium alloys, sheet metal thickness 4mm.
A kind of 3. Magnesium Alloy in Friction Stir welding process method according to claim 1, it is characterised in that：The agitating friction weldering
Equipment, selects round table-like mixing needle, top end diameter 4mm, root diameter (RD) 6mm, and mixing needle length is 3.8mm, shaft shoulder diameter
For 16mm, stirring-head material is stainless steel.
4. a kind of Magnesium Alloy in Friction Stir welding process method according to claim 1, it is characterised in that described to clean out
Refer to：Before welding, cleaning is carried out to the solder side of magnesium alloy using alcohol and acetone and removes degreasing；And with sand paper by position to be welded
Oxide skin cleans out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710637539.1A CN107570859A (en) | 2017-07-31 | 2017-07-31 | A kind of Magnesium Alloy in Friction Stir welding process method |
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| CN201710637539.1A CN107570859A (en) | 2017-07-31 | 2017-07-31 | A kind of Magnesium Alloy in Friction Stir welding process method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114952203A (en) * | 2022-06-28 | 2022-08-30 | 重庆大学 | Magnesium-based alloy-molecular sieve composite hydrogen storage material and preparation method thereof |
| CN115091022A (en) * | 2022-07-06 | 2022-09-23 | 重庆理工大学 | Friction stir welding-based crack repairing and micro-additive method |
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|---|---|---|---|---|
| CN101058880A (en) * | 2007-03-12 | 2007-10-24 | 兰州理工大学 | Method of preparing thin crystal composite layer on magnesium alloy surface |
| CN101537539A (en) * | 2009-04-24 | 2009-09-23 | 重庆大学 | Pin tool for friction stir welding and current carrying friction stir welding method |
| CN101885109A (en) * | 2010-07-30 | 2010-11-17 | 北京理工大学 | Friction stir welding method of medium plate AZ AZ1 magnesium alloy |
| CN102528271A (en) * | 2012-01-20 | 2012-07-04 | 重庆大学 | Method for improving mechanical property of FSW (friction stir welding) magnesium alloy joint |
| CN104139239A (en) * | 2014-07-08 | 2014-11-12 | 北京理工大学 | Method for T-shaped magnesium alloy section friction stir welding |
| CN204954154U (en) * | 2015-07-08 | 2016-01-13 | 重庆大学 | Magnesium alloy friction stir welding temperature field measuring device |
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2017
- 2017-07-31 CN CN201710637539.1A patent/CN107570859A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101058880A (en) * | 2007-03-12 | 2007-10-24 | 兰州理工大学 | Method of preparing thin crystal composite layer on magnesium alloy surface |
| CN101537539A (en) * | 2009-04-24 | 2009-09-23 | 重庆大学 | Pin tool for friction stir welding and current carrying friction stir welding method |
| CN101885109A (en) * | 2010-07-30 | 2010-11-17 | 北京理工大学 | Friction stir welding method of medium plate AZ AZ1 magnesium alloy |
| CN102528271A (en) * | 2012-01-20 | 2012-07-04 | 重庆大学 | Method for improving mechanical property of FSW (friction stir welding) magnesium alloy joint |
| CN104139239A (en) * | 2014-07-08 | 2014-11-12 | 北京理工大学 | Method for T-shaped magnesium alloy section friction stir welding |
| CN204954154U (en) * | 2015-07-08 | 2016-01-13 | 重庆大学 | Magnesium alloy friction stir welding temperature field measuring device |
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| Title |
|---|
| 罗华等: "AZ91D薄板搅拌摩擦焊", 《焊接学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114952203A (en) * | 2022-06-28 | 2022-08-30 | 重庆大学 | Magnesium-based alloy-molecular sieve composite hydrogen storage material and preparation method thereof |
| CN114952203B (en) * | 2022-06-28 | 2024-02-20 | 重庆大学 | Magnesium-based alloy-molecular sieve composite hydrogen storage material and preparation method thereof |
| CN115091022A (en) * | 2022-07-06 | 2022-09-23 | 重庆理工大学 | Friction stir welding-based crack repairing and micro-additive method |
| CN115091022B (en) * | 2022-07-06 | 2023-12-05 | 重庆理工大学 | Crack repairing and micro-additive method based on friction stir welding |
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| CB03 | Change of inventor or designer information |
Inventor after: Pan Qiuhong Inventor after: Li Xin Inventor after: Suo Zhao Inventor after: Zhang Lin Inventor after: Wang Pengfei Inventor after: Xu Jiale Inventor before: Pan Qiuhong Inventor before: Wang Pengfei Inventor before: Xu Jiale Inventor before: Li Xin Inventor before: Suo Zhao Inventor before: Zhang Lin |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180112 |
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| RJ01 | Rejection of invention patent application after publication |