CN216802104U - Composite welding joint for wide-gap welding of turbine stator blade of gas turbine - Google Patents
Composite welding joint for wide-gap welding of turbine stator blade of gas turbine Download PDFInfo
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- CN216802104U CN216802104U CN202122893754.2U CN202122893754U CN216802104U CN 216802104 U CN216802104 U CN 216802104U CN 202122893754 U CN202122893754 U CN 202122893754U CN 216802104 U CN216802104 U CN 216802104U
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Abstract
The utility model discloses a composite welding head for wide-gap welding of a turbine stator blade of a gas turbine, which comprises a swinging laser welding head and an arc welding gun, wherein the arc welding gun is connected with the swinging laser welding head through a welding gun clamping ring. The path of the output light spot of the swinging laser welding head can be in a spiral shape, the laser beam has a stirring effect on a molten pool, the purpose of removing air holes in the welding seam is achieved, meanwhile, the diameter of the laser-electric arc light spot is far larger than that of the output light spot of the traditional single laser welding head, the purpose of amplifying the laser light spot is achieved, and the defect that the traditional single laser beam welding head is poor in adaptability to crack gaps is overcome. The device has the characteristics of simple structure, convenience in use and high practicability, and effectively solves the problems of narrow adaptive clearance and many welding seam air holes of the traditional single laser welding method.
Description
Technical Field
The utility model belongs to the technical field of automatic welding, and particularly relates to a composite welding joint for wide-gap welding of turbine stationary blades of a gas turbine.
Background
The turbine stator blade is one of core components of the gas turbine, and under the action of cycle temperature and thermal stress load caused by frequent start and stop of a unit, thermal fatigue crack damage (crack gaps are generally in the range of 0.3-3 mm) is inevitably generated, so that the high-temperature performance and the service life of the turbine stator blade are seriously influenced. In order to prolong the service life of components and ensure the safe, economic and continuous operation of the power generation equipment of the gas turbine, the development of the welding repair method of the turbine stationary blade of the gas turbine has extremely important significance.
Argon arc welding and other traditional fusion welding processes are listed as standard welding repair methods of gas turbine heat channel components below class E by the American Electric Power Research Institute (EPRI). However, the traditional fusion welding process has large heat input, particularly for high-temperature alloy plates of turbine stationary blades with large thickness, the welding permeability is poor, the back of welding seams is easy to generate the defect of depression, the generated residual stress is easy to cause deformation of the turbine stationary blades and hot cracking of the welding seams, and the repair precision and performance are difficult to ensure. In addition, the alloy material used by the F-grade and above machine-type high-temperature components has higher Al + Ti content and poorer weldability, and the traditional fusion welding process has increasingly greater limitation in the field of repairing the F-grade and above machine-type high-temperature components. Laser welding has become the primary fusion weld repair method for class F gas turbine hot path components. However, the laser welding has more strict requirements on assembly gaps than the traditional fusion welding process, the gaps are generally required to be controlled within 10-15% of the plate thickness, the maximum gap cannot exceed 0.3mm, and a single laser beam is easy to cause the generation of pore defects of welding seams, so that the rejection rate of workpieces is provided, and the application of the laser welding in the field of turbine stator blade large-gap crack welding repair is limited. According to the characteristics of large thickness, large crack gap and the like of the turbine stator blade matrix, a composite welding method with better adaptability is explored, the complementary advantages of different welding methods are realized, the welding efficiency is improved, the repair cost is reduced, and the method is a development trend of the future hot channel component welding repair technology.
Aiming at the limitation of the traditional fusion welding and laser welding in the field of crack damage repair of high-temperature alloy thin-wall components, the laser-electric arc composite welding joint for the wide-gap cracks of the turbine stator blade, which has better crack gap adaptability and can effectively solve the problem of weld pores, is developed, and has important practical significance.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model provides the composite welding joint for the wide-gap welding of the turbine stator blade of the gas turbine, which can effectively solve the problem of air holes of the welding seam, greatly improve the adaptability of the welding seam gap, the welding qualification rate and the production efficiency and meet the laser welding repair requirement of the crack damage of the turbine stator blade of the gas turbine.
The utility model is realized by the following technical scheme:
a composite welding joint for wide-gap welding of a turbine stator blade of a gas turbine comprises a swinging laser welding joint and an arc welding gun, wherein the arc welding gun is connected with the swinging laser welding joint through a welding gun clamping ring, a control end of the arc welding gun is connected with an arc welding power supply, and a welding wire device of the arc welding gun is connected with a wire feeding mechanism;
the swing laser welding head comprises a collimation lens, a swing lens and a focusing lens, the collimation lens is arranged on an output light path of laser, the swing lens is arranged on the output light path of the collimation lens and used for adjusting a light path, the focusing lens is arranged on a reflection light path of the swing lens, light spots output by the focusing lens are coupled with welding wires output by a welding wire device, and an electric arc welding gun is overlapped with a molten pool formed by the light spots.
Preferably, the swing mirror comprises an X-axis mirror and a Y-axis mirror, the axis of the X-axis mirror is perpendicular to the axis of the Y-axis mirror, and the X-axis mirror is located below the Y-axis mirror.
Preferably, the X-axis mirror and the Y-axis mirror are connected to output shafts of two driving motors, respectively.
Preferably, the X-axis mirror and the Y-axis mirror are both mirrors.
Preferably, the oscillation frequency of the light spot output by the oscillating laser welding head is 10HZ to 300 HZ.
Preferably, the swing diameter of the swing laser welding head when the defocusing amount is 0 is 0.3-3 mm.
Preferably, the collimating mirror is a reflective collimating mirror.
Preferably, the collimating lens is disposed on an output light path of the laser generator.
Preferably, the welding wire output by the welding wire device is positioned in a molten pool area.
Preferably, the path of the light spot output by the swinging laser welding head is spiral.
Compared with the prior art, the utility model has the following beneficial technical effects:
the composite welding joint for wide-gap welding of the turbine stator blade of the gas turbine has the characteristics of simple structure, convenience in use and high practicability, under the action of the driving motor, the laser beam swings at high frequency in the X-axis direction and the Y-axis direction to form a spiral welding path, a laser spot is amplified, the laser beam has an obvious stirring effect on a molten pool, the porosity in a welding seam is reduced, the problems of narrow adaptive gap and more welding seam air holes in the traditional single laser welding method are effectively solved, the repair rate of wide-gap cracks of a thick high-temperature alloy plate in the turbine stator blade can be reduced, the welding qualification rate and the production efficiency can be improved, and the argon arc welding repair requirement of crack damage of the turbine stator blade of the gas turbine can be met.
Drawings
FIG. 1 is a schematic structural diagram of a swinging laser-arc hybrid welding head according to the present invention;
FIG. 2 is a schematic view of a weld pool resulting from using the oscillating laser-arc hybrid welding head of the present invention;
FIG. 2a is a molten pool obtained using a swinging laser welding head; FIG. 2b shows the resulting weld pool of a conventional single laser welded joint.
In the figure: 1-swinging the laser welding head; 101-collimating lens; 102-Y axis oscillating lens; 103-X axis oscillating mirror; 104-Y axis drive motor; 105-X axis drive motor; 106-focusing lens; 2-arc welding gun; 3-welding gun clamping ring; 4-wire feeding mechanism; 5-arc welding power supply; 6-spot and puddle area.
Detailed Description
The present invention will now be described in further detail with reference to the attached drawings, which are illustrative, but not limiting, of the present invention.
Referring to fig. 1, a composite welding head for wide gap welding of turbine stator blades of a gas turbine comprises a swinging laser welding head 1 and an arc welding gun 2, wherein the arc welding gun 2 is connected with the swinging laser welding head 1 through a welding gun clamping ring 3.
The swing laser welding head 1 comprises a collimating lens 101, a swing lens and a focusing lens 106, wherein the collimating lens 101 is arranged on an output light path of laser, the swing lens is arranged on the output light path of the collimating lens 101, the swing lens is used for adjusting a light path, the focusing lens 106 is arranged on a reflection light path of the swing lens, and the focusing lens 106 outputs a spiral light spot path.
The control end of the arc welding gun 2 is connected with an arc welding power supply 5, a welding wire device of the arc welding gun 2 is connected with a wire feeding mechanism, a welding wire output by the welding wire device is always positioned in a molten pool area 6, and the arc welding gun is superposed with a molten pool formed by light spots.
The swing mirror comprises an X-axis mirror 103 and a Y-axis mirror 102, the X-axis mirror 103 and the Y-axis mirror 102 are respectively connected with output shafts of an X-axis driving motor 105 and a Y-axis driving motor 104, the swing angles of the X-axis mirror 103 and the Y-axis mirror 102 are controlled through the two driving motors, the path of laser is controlled, and the effects of amplifying laser spots and stirring a molten pool are achieved;
the collimating mirror is a reflective collimating mirror.
The swing frequency of the light spot output by the swing laser welding head 1 is 10 HZ-300 HZ, and the swing diameter when the defocusing amount is 0 is in the range of 0.3-3 mm.
The output laser path of the swinging laser welding head is spiral, the swinging laser welding head is suitable for welding a gap with a crack of 0.1-3 mm, and is suitable for welding high-temperature component base materials, such as turbine stator blades of a gas turbine, and turbine stator blades of the 1 st, 2 nd, 3 th and 4 th stages of turbines and the like.
Referring to fig. 2, the composite welding head for wide gap welding of the turbine stator blade of the gas turbine welds and repairs the moving path of the output light spot when the crack of the service transition section is damaged. It can be seen that under the movement of the swinging laser welding head, the path of the light spot output by the swinging laser welding head is in a spiral shape, the input of the electric arc has obvious broadening effect on the molten pool, and the maximum crack clearance can be adapted to reach 3.0mm, which is far larger than the fusion width (about 2.0mm) obtained by stirring a single laser welding head.
The swing laser welding head is connected with an arc welding power supply and a wire feeding mechanism, the welding head is connected with an arc welding gun through a welding gun clamping ring, single laser passing through a collimating lens swings an X-axis lens and a Y-axis lens through an X-axis driving motor and a Y-axis driving motor respectively in the reflection process of the swing lens, the path of a light path is controlled, the light path is formed in a spiral mode, and the effects of amplifying laser spots and stirring a molten pool are achieved. Meanwhile, the swinging laser beam output by the swinging laser welding head is coupled with the electric arc filler wire, so that a molten pool is wider and filled fully, and the adaptability of a gap is further improved. Under the condition that the welding head moves, the path of an output light spot of the swinging laser welding head can be in a spiral shape, a laser beam has a stirring effect on a molten pool, the purpose of removing air holes in a welding seam is achieved, meanwhile, the diameter of a laser-electric arc light spot is far larger than that of the output light spot of the traditional single laser welding head, the purpose of amplifying the laser light spot is achieved, and the defect that the adaptability of the traditional single laser beam welding head to crack gaps is poor is overcome. The device has the characteristics of simple structure, convenient use and strong practicability, effectively solves the difficult problems of narrow adaptive clearance and many welding seam air holes of the traditional single laser welding method, simultaneously reduces the repair rate of wide-gap cracks of thick high-temperature alloy plates in the turbine stator blade, is favorable for improving the welding qualification rate and the production efficiency, and can meet the laser welding repair requirement of the crack damage of the turbine stator blade of the gas turbine.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. A composite welding joint for wide-gap welding of a turbine stator blade of a gas turbine is characterized by comprising a swinging laser welding joint (1) and an electric arc welding gun (2), wherein the electric arc welding gun (2) is connected with the swinging laser welding joint (1) through a welding gun clamping ring (3), the control end of the electric arc welding gun (2) is connected with an electric arc welding power supply (5), and a welding wire device of the electric arc welding gun (2) is connected with a wire feeding mechanism;
the swing laser welding head (1) comprises a collimating lens (101), a swing lens and a focusing lens (106), wherein the collimating lens (101) is arranged on an output light path of laser, the swing lens is arranged on the output light path of the collimating lens (101), the swing lens is used for adjusting a light path, the focusing lens (106) is arranged on a reflection light path of the swing lens, a light spot output by the focusing lens (106) is coupled with a welding wire output by a welding wire device, and an arc welding gun is overlapped with a molten pool formed by the light spot.
2. The composite weld joint for wide gap welding of stationary turbine blades of a gas turbine according to claim 1, characterized in that the wobble plate comprises an X-axis mirror plate (103) and a Y-axis mirror plate (102), the axis of the X-axis mirror plate (103) is perpendicular to the axis of the Y-axis mirror plate (102), and the X-axis mirror plate (103) is located below the Y-axis mirror plate (102).
3. A composite welded joint for wide gap welding of stationary turbine blades of a gas turbine according to claim 2, characterized in that said X-axis mirror (103) and Y-axis mirror (102) are connected to the output shafts of two driving motors, respectively.
4. A composite welded joint for wide gap welding of stationary turbine blades of a gas turbine according to claim 2, characterized in that the X-axis mirror plate (103) and the Y-axis mirror plate (102) are both mirrors.
5. The composite welding head for wide gap welding of turbine stationary blades of a gas turbine as claimed in claim 1, characterized in that the oscillating laser welding head (1) outputs a spot oscillation frequency of 10HZ to 300 HZ.
6. The composite welded joint for wide gap welding of stationary turbine blades of a gas turbine according to claim 1, wherein the swing diameter of the swing laser welded joint (1) at defocus of 0 is 0.3 to 3 mm.
7. A composite weld joint for wide gap welding of stationary gas turbine blades according to claim 1, wherein said collimating mirror is a reflective collimating mirror.
8. A composite welded joint for wide gap welding of stationary turbine blades of a gas turbine according to claim 1, characterized in that said collimating lens (101) is arranged in the output path of the laser generator.
9. A composite weld joint for wide gap welding of stationary turbine blades in accordance with claim 1, wherein the welding wire output from said wire device is located in the region of the weld puddle.
10. A composite welding head for wide gap welding of stationary turbine blades in a gas turbine according to claim 1, characterized in that the path of the beam spot output from the oscillating laser welding head (1) is spiral.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122893754.2U CN216802104U (en) | 2021-11-19 | 2021-11-19 | Composite welding joint for wide-gap welding of turbine stator blade of gas turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122893754.2U CN216802104U (en) | 2021-11-19 | 2021-11-19 | Composite welding joint for wide-gap welding of turbine stator blade of gas turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216802104U true CN216802104U (en) | 2022-06-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122893754.2U Active CN216802104U (en) | 2021-11-19 | 2021-11-19 | Composite welding joint for wide-gap welding of turbine stator blade of gas turbine |
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| Country | Link |
|---|---|
| CN (1) | CN216802104U (en) |
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2021
- 2021-11-19 CN CN202122893754.2U patent/CN216802104U/en active Active
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