CN108857114A - The auxiliary thermal agitation friction welding method of fusion welding in the case of a kind of prefabricated groove - Google Patents
The auxiliary thermal agitation friction welding method of fusion welding in the case of a kind of prefabricated groove Download PDFInfo
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- CN108857114A CN108857114A CN201811047534.4A CN201811047534A CN108857114A CN 108857114 A CN108857114 A CN 108857114A CN 201811047534 A CN201811047534 A CN 201811047534A CN 108857114 A CN108857114 A CN 108857114A
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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
- B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
- B23K28/02—Combined welding or cutting procedures or apparatus
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Abstract
The invention discloses the auxiliary thermal agitation friction welding methods of fusion welding in the case of a kind of prefabricated groove.First in workpiece to be welded（1）Upper prefabricated groove of different shapes（6）, then workpiece to be welded is completed using fusion welding（1）Welding, the liquid metal of fusing fills up groove（6）Pre- hot weld, in welding process, after Friction Stir Welding follows fusion welding closely, stirring-head（3）Positioned at fusion welding welding gun（5）0 ~ 300mm later, the speed of welding of agitating friction weldering and the speed of welding of fusion welding are consistent in welding process, to make stirring-head（3）With fusion welding welding gun（5）Distance remains unchanged.Fusion welding can uniformly, effectively preheat workpiece to be welded, and subsequent Friction Stir Welding is played the role of improving joint performance, and the present invention can greatly maximize favourable factors and minimize unfavourable ones the combination of two kinds of welding manners, and weld easy to operate, flexible.
Description
Technical field
The present invention relates to welding technology fields, and in particular to is rubbed in the case of a kind of prefabricated groove using the auxiliary thermal agitation of fusion welding
Wipe welding method.
Background technique
Agitating friction weldering is a kind of solid-state welding technology, can be generated each to avoid joint made by flame welding because of the solidification in molten bath
The defects of kind stomata, fire check, segregation.In addition, strong recrystallization can occur for friction stir welding metal, therefore crystal grain is thin
Small, properties are also very excellent.During agitating friction weldering, heat source be mostly derived from frictional heat between stirring-head and workpiece and
It is plastically deformed heat production, quantity of heat production is lower, and workpiece temperature is low, and material resistance of deformation is high.Therefore in welding refractory metal or thickness
Stirring-head will bear great torque and frictional force when plate, and stirring-head is easy to wear and be broken.In addition, agitating friction welds
Quantity of heat production in the termination process part in the friction with the stirring-head shaft shoulder and workpiece surface, friction stir welding
Temperature can be far longer than the temperature of connector bottom.In Friction Stir Welding slab, pyroplastic deformation gradient sharply becomes along plate thickness
Change, the temperature of the root of weld is low, and material is plasticized and flows insufficient, it is easy to cause connector bottom to be not up to metallurgical bonding,
Very easy cracking becomes formation of crack when by extraneous tensile stress, to seriously reduce strength of joint.
In order to reduce the torque and frictional force that stirring-head is born during agitating friction welds, many scholars use external heat source
The mode of auxiliary completes the Friction Stir Welding of workpiece.Make in auxiliary thermal agitation friction welding process first with other auxiliary thermal sources
Workpiece preheats and sufficiently softens, and agitating friction weldering is then recycled to realize the connection of workpiece.Due to agitating friction weldering when workpiece
Sufficiently softened, material resistance of deformation greatly reduces, therefore the torque that stirring-head is born when welding is also greatly dropped with frictional force
Low, sharp wear and the fracture of stirring-head can effectively avoid.In addition, the addition of auxiliary thermal source can increase the mobility of material to
The defects of effectively avoiding generating loose, hole in welding point.Currently, having had the auxiliary thermal agitation friction welding (FW) of electric resistance welding, ratio-frequency welding
The auxiliary thermal agitation friction welding (FW) of auxiliary thermal agitation friction welding (FW), laser, the auxiliary thermal agitation friction welding (FW) of acetylene torch and the auxiliary thermal agitation of plasma arc rub
Wipe weldering report.But the upper surface of workpiece to be welded is all used for when these auxiliary heating source for heating, and there is no had for workpiece bottom to be welded
Effect preheats, and the temperature of workpiece surface will be much higher than workpiece bottom in welding process, so as to cause welding point top and bottom
Microstructure and mechanical property there are greatest differences, connector is easy to produce welding defect, and performance can also decrease.
Summary of the invention
In view of the above problems, the object of the present invention is to provide one kind in the case where prefabricated groove, the auxiliary heat of fusion welding is utilized
Mode complete workpiece Friction Stir Welding method.
The specific steps are：
Then the prefabricated groove of different shapes first on workpiece to be welded completes the welding of workpiece to be welded, fusing using fusion welding
Liquid metal fill up the pre- hot weld of groove, in welding process, after Friction Stir Welding follows fusion welding closely, stirring-head is located at molten
Change 0 ~ 300mm after welding welding gun, the speed of welding of agitating friction weldering and the speed of welding of fusion welding are consistent in welding process,
To make stirring-head remain unchanged with fusion welding welding gun distance；After the completion of fusion welding, workpiece temperature to be welded is higher, material deformation
Drag is lower, and the torque and frictional force that stirring-head is born during subsequent agitating friction weldering greatly reduce, and workpiece to be welded stirs
Mixing friction welding can go on smoothly；In the case where prefabricated groove, the welding wire of fusing can fill up groove, weld seam bulk temperature compared with
Height, and temperature difference in a thickness direction is smaller, this solves workpiece top and bottom to be welded when the heating of other auxiliary hot methods
Temperature there are the problems of greatest differences.It can be controlled by adjusting fusion welding parameter with agitating friction weldering parameter in welding process
Heat input in welding process.In addition, pre- thermal effect can control by adjusting the distance between fusion welding welding gun and stirring-head
Fruit.When welding gun and stirring-head are closer, weld metal just solidifies, and temperature is higher, and material resistance of deformation is lower, therefore preheats
Effect is preferable；When welding gun and stirring-head distance farther out when, weld metal has cooled down, and temperature is lower, and material resistance of deformation is high, in advance
Thermal effect weakens.
The characteristics of fusion welding is at low cost, technology maturation, easy to operate, but joint quality not can guarantee.Workpiece to be welded
Forced plasticity deforming can be introduced into weld seam in the Friction Stir Welding after welding using fusion welding, make connector generation is strong to tie again
Crystalline substance to eliminate the welding defects such as the stomata of melting welding head, segregation, fire check, and then improves joint performance.In agitating friction
During weldering, by using the stirring-head of different shape and size can make melting welding head a certain position or entire connector
Forced plasticity deforming occurs, to improve the mechanical property of the certain specific regions of welding point or entirety.
It can be seen that fusion welding can uniformly, effectively preheat workpiece to be welded, and subsequent Friction Stir Welding is played raising and is connect
The effect of head performance, the present invention can greatly maximize favourable factors and minimize unfavourable ones the combination of two kinds of welding manners, and weld easy to operate, clever
It is living.
Detailed description of the invention
Fig. 1 is welding process of embodiment of the present invention schematic diagram.
It is marked in figure：1- workpiece to be welded；2- stir friction welding seam；3- stirring-head；4- melts welding line；5- fusion welding weldering
Rifle；6- groove.
Embodiment 1：
As shown in Figure 1, workpiece 1 to be welded be 7mm thickness low-carbon micro steel-alloy, before welding on workpiece 1 to be welded prefabricated v-shaped groove
6, width and the height of v-shaped groove 6 are respectively 6mm and 6mm, use mixed gas first in welding process（65%A r + 26. 5%H
e + 8%CO 2 + 0. 5%O2）Workpiece 1 to be welded is welded in protection weldering, and the welding wire of fusing is made to fill up v-shaped groove 6, in welding process
Voltage is 25V, and electric current 200A, welding travel speed is 75mm/min, gage of wire 1.2mm.In welding process, stirring rubs
After wiping welding follows mixed gas arc welding closely, stirring-head 3 is located at 30mm after mixed gas arc welding welding gun 5, agitating friction
Welding travel speed is 75mm/min, is consistent with fusion welding travel speed；3 material of stirring-head is W-Re alloy, stirring
First 3 shaft shoulder diameter is 20mm, and mixing needle is taper, the long 6mm of needle, and stirring-head revolving speed is 600rpm in stir friction welding process.
It is easy to weld operating process, welding process is stablized, and stirring-head has no noticeable wear after the completion of welding, and welding point does not have any lack
It falls into.
Embodiment 2：
Workpiece 1 to be welded is thick 7050 aluminium alloy thick plates of 30mm, before welding on workpiece 1 to be welded prefabricated v-shaped groove 6, v-shaped slope
The width of mouth 6 is respectively 20mm and 27mm with height, is soldered into the welding of workpiece in welding process using MIG first, makes the weldering melted
Silk fills up v-shaped groove 6, and voltage is 23V in welding process, and electric current 240A, welding travel speed is 50mm/min, and welding wire is straight
Diameter is 1.2mm.In welding process, Friction Stir Welding follows MIG closely thereafter, and stirring-head 3 is located at 45mm after fusion welding welding gun 5,
Friction Stir Welding travel speed is 50mm/min, is consistent with fusion welding travel speed.3 material of stirring-head is tool
Steel, 3 shaft shoulder diameter of stirring-head are 40mm, and mixing needle is taper, the long 28mm of needle, and the revolving speed in stir friction welding process is
500rpm.It is easy to weld operating process, welding process is stablized, and stirring-head has no noticeable wear after the completion of welding, and welding point does not have
There is any defect.
Embodiment 3：
Workpiece 1 to be welded be 10mm thickness copper plate, before welding on workpiece 1 to be welded prefabricated unilateral v-shaped groove 6, unilateral v-shaped slope
The width of mouth 6 is respectively 5mm and 7mm with height, is soldered into the welding of workpiece in welding process using MIG first, makes the welding wire melted
V-shaped groove 6 is filled up, voltage is 31V in welding process, and electric current 240A, welding travel speed is 50mm/min, gage of wire
For 1.2mm.In welding process, followed by Friction Stir Welding, stirring-head 3 rubs apart from 30mm after fusion welding welding gun 5, stirring
Wiping welding travel speed is 50mm/min, is consistent with fusion welding travel speed.3 material of stirring-head is high-speed steel, stirring
First 3 shaft shoulder diameter is 20mm, and mixing needle is taper, the long 9.8mm of needle, and the revolving speed in stir friction welding process is 500rpm.Weldering
Operating process simplicity is connect, welding process is stablized, and stirring-head has no noticeable wear after the completion of welding, and welding point does not have any lack
It falls into.
Claims (1)
1. the auxiliary thermal agitation friction welding method of fusion welding in the case of a kind of prefabricated groove, it is characterised in that the specific steps are：First
In workpiece to be welded（1）Upper prefabricated groove of different shapes（6）, then workpiece to be welded is completed using fusion welding（1）Welding, fusing
Liquid metal fill up groove（6）Pre- hot weld, in welding process, after Friction Stir Welding follows fusion welding closely, stirring-head（3）
Positioned at fusion welding welding gun（5）0 ~ 300mm later, the speed of welding of the speed of welding of agitating friction weldering and fusion welding in welding process
It is consistent, to make stirring-head（3）With fusion welding welding gun（5）Distance remains unchanged.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811047534.4A CN108857114A (en) | 2018-09-09 | 2018-09-09 | The auxiliary thermal agitation friction welding method of fusion welding in the case of a kind of prefabricated groove |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811047534.4A CN108857114A (en) | 2018-09-09 | 2018-09-09 | The auxiliary thermal agitation friction welding method of fusion welding in the case of a kind of prefabricated groove |
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| Publication Number | Publication Date |
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| CN108857114A true CN108857114A (en) | 2018-11-23 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111151904A (en) * | 2020-02-11 | 2020-05-15 | 重庆理工大学 | Dissimilar metal arc melting-brazing method based on gnawing cutting assistance |
| CN111843173A (en) * | 2020-07-09 | 2020-10-30 | 中车青岛四方机车车辆股份有限公司 | Composite welding method and device for friction stir welding |
| CN112743249A (en) * | 2020-12-24 | 2021-05-04 | 西南交通大学 | Method and system for stirring and strengthening welding seam of composite layer based on electric arc melting of base material |
| CN115502593A (en) * | 2022-10-07 | 2022-12-23 | 哈尔滨工程大学 | Welding method for titanium alloy arc welding assisted by friction stir |
-
2018
- 2018-09-09 CN CN201811047534.4A patent/CN108857114A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111151904A (en) * | 2020-02-11 | 2020-05-15 | 重庆理工大学 | Dissimilar metal arc melting-brazing method based on gnawing cutting assistance |
| CN111151904B (en) * | 2020-02-11 | 2021-07-23 | 重庆理工大学 | Dissimilar metal arc melting-brazing method based on gnawing cutting assistance |
| CN111843173A (en) * | 2020-07-09 | 2020-10-30 | 中车青岛四方机车车辆股份有限公司 | Composite welding method and device for friction stir welding |
| CN112743249A (en) * | 2020-12-24 | 2021-05-04 | 西南交通大学 | Method and system for stirring and strengthening welding seam of composite layer based on electric arc melting of base material |
| CN115502593A (en) * | 2022-10-07 | 2022-12-23 | 哈尔滨工程大学 | Welding method for titanium alloy arc welding assisted by friction stir |
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Application publication date: 20181123 |