CN201333591Y - Device for composite resistance heat - friction stir welding of stainless steel - Google Patents
Device for composite resistance heat - friction stir welding of stainless steel Download PDFInfo
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- CN201333591Y CN201333591Y CNU2008202284262U CN200820228426U CN201333591Y CN 201333591 Y CN201333591 Y CN 201333591Y CN U2008202284262 U CNU2008202284262 U CN U2008202284262U CN 200820228426 U CN200820228426 U CN 200820228426U CN 201333591 Y CN201333591 Y CN 201333591Y
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Abstract
The utility model discloses a device for composite resistance heat - friction stir welding of stainless steel, which comprises a power supply, a transformer and a stirring head, wherein the two output ends of the power supply are connected with the input end of the transformer through cables, and one output end of the transformer is connected with a pad for placing the welded workpieces through a cable; the other output end of the transformer is connected with an electric brush through a cable, and the electric brush is contacted with a copper ring in a groove which is positioned at the upper end of the stirring head. When the device is adopted to weld, the transformer is adjusted to form a low-voltage high current, and a stirring pin is driven by a motor to screw between the two welded workpieces; and a low-voltage high current circuit is turned on to allow higher resistance heat to be generated on the welded workpieces, so that the materials at the welding seam position are plasticized under the high temperature action of friction heat and resistance heat, and a welding seam is formed at the back of the stirring pin. The utility model can realize the friction stir welding of stainless steel, reduce the wear of the stirring head, increase the welding length of the stirring head, and prolong the service life of the stirring head, and has simple structure and easy realization.
Description
Technical field
The utility model belongs to the metal solder field, relates to a kind of agitating friction and welds stainless device, particularly a kind of resistance heat---the device of stir friction composite welding stainless steel.
Background technology
Stainless steel is as a kind of important materials in the modern industry, has the characteristic of many excellences such as high strength, corrosion-resistant, easy processing, is widely used in industries such as boats and ships, vehicle, automobile and home appliance.In stainless steel processing process, be welded into requisite process technology.At present, have problems when adopting traditional welding process soldering stainless steel: for example, austenitic stainless steel easily forms the column crystal of high directivity, is beneficial to impurity segregation and produces solidification cracking; Ferritic stainless steel is under high thermal cycle effect, and ferrite crystal grain is easy to grow up, and causes the joint embrittlement; Martensitic stain less steel easily forms cold crack etc.This makes and is difficult to obtain desirable weld seam when adopting traditional fusion welding method soldering stainless steel, has limited stainless application to a certain extent.
The agitating friction solder technology is a kind of novel Solid-phase welding technology of Britain's institute of welding in exploitation in 1991.In the stir friction welding process, the plastic deformation that soldered material production is violent can realize welding point structure refinement and homogenising.Lower thermal cycle effect in the welding process has reduced the microstructure coarsening tendency, makes welding point have high intensity and toughness.The problem that the agitating friction solder technology has occurred when having overcome traditional welding process soldering stainless steel is for the stainless steel welding provides an approach that has development potentiality.
But low melting materials such as magnesium alloy, aluminium alloy because stainless steel has higher intensity and hardness, have significantly increased the difficulty of stainless steel agitating friction welding relatively.Especially in stainless steel agitating friction when welding,, stirring-head bears that bigger mechanical force is carried, frictional heat is carried and serious wearing and tearing, thereby the material of stirring-head has been proposed higher requirement.Therefore, the friction stir welding of designing and developing with low cost and long service life becomes the key issue that solves the welding of stainless steel agitating friction with stirring-head.In stainless steel when welding,, temperature is up to more than 1000 ℃, and the material that can satisfy instructions for use under so high temperature is refractory metal alloy or structural ceramics often, and the manufacturing of these materials and difficulty of processing are all bigger.At present, adopt polycrystal cubic boron nitride and tungsten-bast alloy as the stirring-head material mostly.Tungsten-bast alloy toughness is better, and be difficult in the welding process brittle break takes place, but easily wear and tear, and cost an arm and a leg (about 40,000 yuan/Kg).And the wearability of polycrystal cubic boron nitride is better, and material cost is relatively low, but its toughness is relatively poor, is easy to brittle failure, and commercial PCBN is mainly the U.S. and monopolizes.This shows that design and develop with low costly at present, the stirring-head of function admirable remains in big difficulty, causes stainless friction stir welding to receive bigger restriction.
In sum, realize stainless agitating friction welding,, also need in stir friction welding process, adopt auxiliary heating process except doing the improvement to material, shape and the size of stirring-head.The high temperature action that utilizes auxiliary thermal source is softening with workpiece, makes that imposing less live load just can drive stirring-head and move, the deficiency of compensation stirring-head and workpiece frictional heat, and the plasticity that increases metal flows, the realization that assurance stainless steel agitating friction welds.Moreover, reduce to a certain extent the high performance requirement of stirring-head material, make in the stainless steel stir friction welding process, use the used stirring-head of welding low melting material to become possibility, alleviated the restrictive function of high-performance stirring-head the welding of stainless steel agitating friction.Simultaneously, auxiliary heating process effectively reduces the wearing and tearing of stirring-head, increases the effective length of weld of stirring-head, thereby prolongs its service life.From relevant report both domestic and external as seen, the form of auxiliary thermal source has laser auxiliary thermal source, plasma auxiliary thermal source, electric arc auxiliary thermal source and heating tube auxiliary thermal source.But in use all there are some problems in these auxiliary thermal sources and device thereof.For example, laser is as auxiliary thermal source, and surface of the work is more serious to the reflection of its energy, and heat loss is more; The apparatus structure complexity of plasma and electric arc auxiliary thermal source costs an arm and a leg; The efficiency of heating surface of heating tube is low, and heat time heating time is long, greatly reduces the efficient of agitating friction welding.
Summary of the invention
Defective or deficiency at the auxiliary heating technique existence of stainless steel agitating friction welding in the above-mentioned prior art, the purpose of this utility model is, a kind of resistance heat is provided---the device of stir friction composite welding stainless steel, this device has utilized the characteristics of the high resistivity of stainless steel material own, effectively soldering stainless steel material.
In order to realize above-mentioned task, the technical scheme that the utility model adopted is:
The device of a kind of resistance heat---stir friction composite welding stainless steel comprises power supply, transformer and stirring-head, has on the stirring-head by the motor-driven shaft shoulder and mixing needle; It is characterized in that, two outputs of described power supply link to each other with the input of transformer by cable, an output of transformer is connected with backing plate by cable, described backing plate is used to place welded part, another output of transformer is connected with brush by cable, and described brush contacts with the copper ring that is positioned at stirring-head upper end groove.
The device of resistance heat of the present utility model---stir friction composite welding stainless steel, for stainless agitating friction welding provides a kind of effective jig, adopt this device to carry out stainless welding, can effectively reduce the difficulty of stainless steel agitating friction welding.Simultaneously, reduce the wearing and tearing of stirring-head, increase the weld length of stirring-head, prolong the service life of stirring-head, and apparatus structure is simple, be easy to realize that cost is lower.
Description of drawings
Fig. 1 is a structural representation of the present utility model.Label is wherein represented respectively: 1, power supply, 2, cable, 3, cable, 4, transformer, 5, cable, 6, cable, 7, brush, 8, copper ring, 9, stirring-head, 10, the shaft shoulder, 11, mixing needle, 12, welded part (left side), 13, welded part (right side), 14, backing plate, K
1, power output end, K
2, power output end, K
3, the transformer input, K
4, the transformer input, K
5, the transformer output, K
6, the transformer output.
Below in conjunction with drawings and Examples the utility model is further specified.
The specific embodiment
Referring to Fig. 1, the device of resistance heat of the present utility model---stir friction composite welding stainless steel comprises power supply 1, transformer 4 and stirring-head 9, has on the stirring-head 9 by the motor-driven shaft shoulder 10 and mixing needle 11; Two output (K of power supply 1
1, K
2) respectively with two input (K of transformer 4
3, K
4) link to each other an output K of transformer 4 by cable (2,3)
6Be connected with backing plate 14 by cable 6, backing plate 14 is used to place welded part, another output K
5Be connected with brush 7 by cable 5.Brush 7 contacts with the copper ring 8 that is positioned at stirring-head 9 upper end grooves, guaranteeing brush 7 in the rotation moving process of stirring-head 9, and the reliable transmission of electric current between the stirring-head 9.
Adopting above-mentioned resistance heat---the device of stir friction composite welding stainless steel is used for the method for soldering stainless steel, comprises the following steps:
Two welded parts are placed the upper surface of backing plate, dock and compress; Power supply 1 is reduced to 2V～20V through transformer 4 with voltage, make electric current be increased to 200A～3000A, form low-voltage, high-current, the upper surface that output K5 process cable 5, brush 7, copper ring 8 and the stirring-head 9 of transformer 4 and mixing needle 11 thereof are delivered to welded part 12 (left side), welded part 13 (right side), another output K6 of transformer delivers to the lower surface of welded part 12 (left side) and welded part 13 (right side) through cable 6 and backing plate 14.
During the agitating friction welding, welded part 12 (left side), after welded part 13 (right side) butt joint is also compacted, mixing needle 11 is slowly screwing under the driving of motor between welded part 12 (left side) and the welded part 13 (right side), mixing needle 11 contact welded parts 12 (left side) on stirring-head 9, during welded part 13 (right side) upper surface, 9 pairs of welded parts 12 of stirring-head (left side), welded part 13 (right side) applies certain pressure, at this moment, low-voltage, high-current is switched on, because of welded part 12 (left side), self there is high resistance in welded part 13 (right side), then electric current is on welded part 12 (left side), welded part 13 can produce higher heat on (right side), big large compensation stirring-head 9 and welded part 12 (left side), the deficiency of welded part 13 (right side) frictional heat.Simultaneously, stirring-head 9 drives mixing needle 11 beginnings and moves with certain speed along bead direction, the material of commissure is under the high temperature superposition of mixing needle 11 frictional heats and resistance heat, present high temperature visco-plasticity state, form weld seam at mixing needle 11 rear portions, welded part 12 (left side), welded part 13 (right side) are welded together.Because the relative motion between mixing needle 11 and welded part 12 (left side), the welded part 13 (right side), the high temperature visco-plasticity state of the material production of commissure also produces relative motion in weld seam inside, under heat activation, this layer presents the material generation dynamic recrystallization of high temperature visco-plasticity state, make welded part 12 (left side), welded part 13 (right side) by phase counterdiffusion and crystallization again, thereby weld together, after the weld seam for the treatment of welded part 12 (left side), welded part 13 (right side) was all finished, whole welding process was finished.
Below be the specific embodiment that the inventor provides, the utility model is not limited to these embodiment.
Specific embodiment 1:
316 thick stainless steels of welding 3mm, stirring-head is the tungsten alloy steel, and shaft shoulder diameter is 16mm, and the mixing needle diameter is 5mm, and length is 2.9mm.Adopting resistance heat of the present utility model---agitating friction composite welding process, the rotary speed of stirring-head are 950r/min, and speed of welding is 60mm/min, and auxiliary current is 1000A.Weld length is 150mm, and the tensile strength of the stainless steel welded joint after welding reaches 86% of mother metal, and the stirring-head wearing and tearing are lighter.
Do not having under the condition of auxiliary thermal source, carrying out the agitating friction welding, can't form effective connection, and the stirring-head serious wear.
Specific embodiment 2:
304 thick stainless steels of welding 3mm, stirring-head is the tungsten alloy steel, and shaft shoulder diameter is 16mm, and the mixing needle diameter is 5mm, and length is 2.9mm.Adopting resistance heat of the present utility model---the device of stir friction composite welding stainless steel welds, and the rotary speed of stirring-head is 950r/min, and speed of welding is 60mm/min, and auxiliary current is 1000A, and weld length is 142mm.The tensile strength of the stainless steel welded joint after welding reaches 85% of mother metal, and the stirring-head wearing and tearing are lighter.
Do not having under the condition of auxiliary thermal source, carrying out the agitating friction welding, can't form effective connection, and the stirring-head serious wear.
The foregoing description adopts device of the present utility model to carry out stainless welding as can be seen, can effectively reduce the difficulty of stainless steel agitating friction welding.Simultaneously, reduce the wearing and tearing of stirring-head, increase the weld length of stirring-head, prolong the service life of stirring-head.
Claims (1)
1. a resistance heat---the device of stir friction composite welding stainless steel comprises power supply (1), transformer (4) and stirring-head (9), has on the stirring-head (9) by the motor-driven shaft shoulder (10) and mixing needle (11); It is characterized in that, two outputs of described power supply (1) link to each other by the input of cable with transformer (4), an output of transformer (4) is connected with backing plate (14) by cable, described backing plate (14) is used to place welded part, another output of transformer (4) is connected with brush (7) by cable, and described brush (7) contacts with the copper ring (8) that is positioned at stirring-head (9) upper end groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202284262U CN201333591Y (en) | 2008-12-25 | 2008-12-25 | Device for composite resistance heat - friction stir welding of stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202284262U CN201333591Y (en) | 2008-12-25 | 2008-12-25 | Device for composite resistance heat - friction stir welding of stainless steel |
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| Publication Number | Publication Date |
|---|---|
| CN201333591Y true CN201333591Y (en) | 2009-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202284262U Expired - Fee Related CN201333591Y (en) | 2008-12-25 | 2008-12-25 | Device for composite resistance heat - friction stir welding of stainless steel |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102303184A (en) * | 2011-08-23 | 2012-01-04 | 重庆大学 | Current-loaded linear friction welding device |
| CN102974945A (en) * | 2012-12-24 | 2013-03-20 | 上海电机学院 | Electro-plastic friction stir spot welding device and method thereof |
| CN103008874A (en) * | 2012-12-24 | 2013-04-03 | 上海电机学院 | Agitating friction spot welding device and method for dissimilar metal |
| CN103170752A (en) * | 2013-04-09 | 2013-06-26 | 上海电机学院 | Friction stir spot welding (FSSW) device of resistor and method thereof |
-
2008
- 2008-12-25 CN CNU2008202284262U patent/CN201333591Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102303184A (en) * | 2011-08-23 | 2012-01-04 | 重庆大学 | Current-loaded linear friction welding device |
| CN102974945A (en) * | 2012-12-24 | 2013-03-20 | 上海电机学院 | Electro-plastic friction stir spot welding device and method thereof |
| CN103008874A (en) * | 2012-12-24 | 2013-04-03 | 上海电机学院 | Agitating friction spot welding device and method for dissimilar metal |
| CN103170752A (en) * | 2013-04-09 | 2013-06-26 | 上海电机学院 | Friction stir spot welding (FSSW) device of resistor and method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091028 Termination date: 20100125 |