CN115647550A - Electron beam repair welding method for through cracks of large-thickness plate in curved surface state - Google Patents
Electron beam repair welding method for through cracks of large-thickness plate in curved surface state Download PDFInfo
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Abstract
The invention discloses an electron beam repair welding method for through cracks of a large-thickness plate in a curved surface state, which comprises the following steps of: performing repair welding on the front surface of the plate twice to form two welding seams, wherein the first welding seam passes through one end of the crack and is parallel to the welding direction of the original welding seam, and the second welding seam is deviated along the width direction of the crack in a state of keeping parallel to the first welding seam so as to cover the crack by the first welding seam and the second welding seam; and turning over the plate, and performing the same repair welding process on the back of the plate. The invention further discloses a method for realizing the repair welding of the cracks of the curved-surface plate by adopting the backing plate. The invention ensures the uniformity of the performance of the repaired crack, and obviously improves the repair welding efficiency and quality.
Description
Technical Field
The invention belongs to the technical field of welding, and relates to an electron beam repair welding method for through cracks of a large-thickness plate in a curved surface state.
Background
The bottom of the storage box with the diameter of 5m is an important component of the storage box of the carrier rocket in China, and with a series of major breakthroughs in the fields of space station construction, manned aerospace and the like in China, higher requirements are put forward for the reliability of the carrier rocket, so that the optimization work of the structure of the bottom of the storage box is carried out by aiming at the problems of weight reduction of the bottom of the storage box of the carrier rocket, further improvement of the strength of a weld joint and the like. Taking the design structure of the bottom of a certain type of storage tank as an example at present, the original circular ring structure of the bottom of the storage tank formed by welding the melon petals and the flanges is changed into an integral spinning forming spherical bottom structure, and the preparation of the bottom structure of the storage tank is realized by using a method of welding electron beam plates, preforming pressing drums and spinning forming. By means of improvement of the process method, the number of the whole welding seams is greatly reduced, the problem of strength reduction caused by overaging softening of the welding seam area is solved, but the problem that the current drum pressing process is immature is solved, cracks are easy to appear at the weak positions of the welding seams of the electron beams, even the penetrability characteristic is formed, and a certain width is presented at the position of the transverse welding seam. At the moment, the plate is in a curved surface state, which brings certain difficulty to subsequent repair welding treatment. The through cracks are shown in fig. 1.
At present, the repair welding of weld defects is mainly based on the traditional fusion welding process, and aims at the problems of poor permeability, large heat input, coarsening of crystal grains and the like of large-thickness plates, and the joint performance is deteriorated compared with the original electron beam weld.
Disclosure of Invention
The invention aims to overcome the defects, provides the electron beam repair welding method for the penetrating crack of the large-thickness plate in the curved surface state, solves the technical problem that the traditional repair welding method is difficult to realize high-quality repair welding, further solves the technical problem that the traditional repair welding method is difficult to realize curved surface repair welding, ensures the uniformity of the performance after crack repair welding, and obviously improves the repair welding efficiency and quality.
In order to achieve the above purpose, the invention provides the following technical scheme:
an electron beam repair welding method for through cracks of a large-thickness plate comprises the following steps:
performing repair welding on the front surface of the plate twice to form two welding seams, wherein the first welding seam passes through one end of the crack and is parallel to the welding direction of the original welding seam, and the second welding seam is deviated along the width direction of the crack in a state of keeping parallel to the first welding seam so as to cover the crack by the first welding seam and the second welding seam;
and turning the plate, and performing repair welding on the back of the plate twice to form two welding seams, wherein the first welding seam passes through one end of the crack and is parallel to the welding direction of the original welding seam, and the second welding seam is deviated along the width direction of the crack in a state of being parallel to the first welding seam, so that the first welding seam and the second welding seam cover the crack.
Further, for a crack with a width W, where the width refers to the offset width of the crack in the direction perpendicular to the welding direction on the upper and lower surfaces of the weld, as shown in FIG. 4, the second weld is offset in the direction of the crack width with the distance W while maintaining the parallel state with the first weld 1 ，W 1 Satisfies the following relation:
further, for a crack having a depth of B, the depth of the first weld and the second weld is B 1 The following relation is satisfied:
further, when the first repair welding is carried out on the front surface or the back surface of the plate, the method comprises the following steps:
making an auxiliary line parallel to the original welding direction of the welding seam at one end of the crack, and arranging a plurality of punching points along the auxiliary line;
determining a repair welding arc receiving point and an arc starting point;
selecting at least one of the plurality of impact points, an arc ending point and an arc starting point as teaching points;
and (4) performing repair welding by using teaching points and adopting a track teaching mode under the camera to obtain a first welding line.
Furthermore, the punching points are formed by knocking the surface of the plate by using a screw tap, the distance L between every two adjacent punching points is 5-8 mm, and a plurality of punching points are uniformly distributed along the auxiliary line.
Furthermore, the arc-closing point falls on the arc-closing plate, the arc-starting point is positioned in front of one end of the crack, and the distance L' between the arc-starting point and one end of the crack is 48-53 mm.
Further, when the repair welding is carried out, when the plate is in a curved surface state, the backing plate is utilized to be padded on one side of the plate, so that the tangent plane of the position where the crack is located is vertical to the direction of the electron gun;
the backing plate and the crack are respectively positioned at two sides of the center point of the curved surface.
Further, when repair welding is carried out on the concave surface of the plate, the height H of the backing plate 1 The following formula is satisfied:
H 1 ≥R-Rcosθ 1
wherein R is the curvature radius of the center point of the curved surface, theta 1 The included angles of the connecting line of the crack and the sphere center and the connecting line of the curved surface central point and the sphere center are included;
the arc length between the contact position of the backing plate and the curved surface and the central point of the curved surface is 200-300 mm;
length L of the backing plate 1 500-1000 mm.
Further, when repair welding is carried out on the convex surface of the plate, the height H of the backing plate 3 The following formula is satisfied:
wherein H * The height of the center point of the curved surface when the plate is horizontally placed, H' is the height of the crack from the horizontal workbench when the tangent of the curved surface at the crack is vertical to the direction of the electron gun, R is the curvature radius of the center point of the curved surface, and theta 2 The included angles between the crack and the connecting line of the sphere center and between the curved surface central point and the sphere center connecting line are included;
length L of the backing plate 2 1000-1500 mm.
Furthermore, when repair welding is carried out on the concave surface of the plate, the working distance H of the electron gun 2 Crack and curveThe distance H' between the face edges in the direction of the electron gun;
when repair welding is carried out on the convex surface of the plate, the working distance H of the electron gun 4 ≥H max -H ", wherein H max And H' is the height of the crack from the horizontal workbench when the tangent line of the curved surface at the crack is vertical to the direction of the electron gun.
Compared with the prior art, the invention has at least one of the following beneficial effects:
(1) The invention creatively provides an electron beam repair welding method for the through cracks of the large-thickness plate, which realizes one-time complete repair welding of the through cracks with certain width and avoids the problem of performance degradation caused by multiple repair welding;
(2) The invention adopts a method of double-sided repair welding of a plurality of welding seams, and realizes full coverage of the crack in the depth direction, the width direction and the length direction;
(3) The invention provides a repair welding teaching track and a method for determining an arc starting point and an arc ending point, which is beneficial to improving the repair welding quality and the repair welding efficiency;
(4) According to the invention, the electron beam repair welding method for the curved-surface-state large-thickness plate penetrating through the crack simulation plane is developed, the complexity of numerical control track programming is reduced by adding the base plate at the bottom and optimizing process parameters, the uniformity of the performance of the crack in the length direction after repair welding is ensured, and the repair welding efficiency and quality are obviously improved;
(5) The invention comprehensively considers various factors of the concave surface and the convex surface repair welding, gives the relation and regular expression of the position of the backing plate and the crack, can accurately control the size of the backing plate, improves the stability of the welding process and avoids a large amount of trial and error costs;
(6) The invention adopts electron beam repair welding, has high energy density, concentrated heat input and deeper fusion depth compared with other welding methods, can effectively reduce repair welding times, avoids serious welding deformation and welding stress caused by multilayer multi-pass welding, and can also improve welding efficiency to a certain extent.
Drawings
FIG. 1 is a diagram of a typical through crack object, wherein (a) and (b) are diagrams of different shapes of crack objects respectively;
FIG. 2 is a schematic view of the location of the crack punch point of the present invention;
FIG. 3 is a schematic view of the crack trajectory teaching of the present invention;
FIG. 4 is a schematic view of a weld crack of the present invention;
FIG. 5 is a schematic view of a repair weld of the present invention;
FIG. 6 is a graph showing the effect of repair welding of cracks according to the present invention; wherein, (a) is a size schematic diagram, and (b) is a real object diagram after repair welding;
FIG. 7 is a schematic illustration of the concave surface of a curved sheet;
FIG. 8 is a schematic diagram of the method for determining the height of the pad plate for the concave surface of a curved plate according to the present invention;
FIG. 9 is a schematic view of the electron gun working distance for a concave surface of a curved sheet material according to the present invention;
FIG. 10 is a schematic view of a convex side of a curved sheet material;
FIG. 11 is a schematic diagram of the method for determining the height of the pad plate on the convex side of the curved plate according to the present invention;
FIG. 12 is a schematic view of the electron gun working distance for the convex side of a curved sheet material according to the present invention.
Detailed Description
The features and advantages of the present invention will become more apparent and appreciated from the following detailed description of the invention.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The current crack repair welding method is mainly based on a TIG fusion welding process and is limited by the heat source characteristics of the method, the heat input in the welding process is large, the coarsening of the joint structure is obvious, and the joint strength is seriously reduced after repair welding; in addition, although TIG welding is usually protected by inert gas, the defects that harmful substances enter a molten pool, air holes are included and the like are difficult to completely avoid, and the heat dissipation condition of a large-thickness plate is good, which inevitably leads to larger heat input during welding, otherwise the molten pool is difficult to open, the tip of a tungsten electrode is easy to locally melt and invade the molten pool, and the defect of serious tungsten inclusion is generated; in addition, for repair welding of large-thickness plates, a process method of groove forming and multilayer multi-pass welding is generally adopted for TIG welding, time and labor are wasted, and joint performance is also deteriorated by repeated heating of a welding seam. In conclusion, the existing TIG repair welding method has the problems of poor joint strength, internal defects, poor efficiency and the like by combining with a new generation of manned welding, and is not suitable for repair welding of through cracks of large-thickness plates.
The electron beam welding process is used as a high-energy beam welding method, has the advantages of strong penetrating power, large weld depth-to-width ratio, small heat affected zone and the like, has good grain structure, can reduce the performance degradation of joints caused by repair welding to the minimum, and is completely suitable for the repair welding work of through cracks due to the characteristic of high depth-to-width ratio. However, the penetrating crack not only penetrates through the whole thickness, but also has a certain width in the transverse direction of the welding seam, the high aspect ratio characteristic of the electron beam welding is adversely affected, and the transverse repair welding of the penetrating crack cannot be completely realized by a single welding seam due to the too narrow welding seam.
The electron beam welding in the flat plate state does not need to consider the interference problem of an electron gun and the change problem of the working distance of a welding gun, but the electron beam repair welding needs to consider the climbing welding in the curved surface direction aiming at the curved surface large-thickness plate, and the interference problem of the electron gun and the curved surface edge of the plate exists, so that great difficulty is brought to the repair welding work.
The invention not only can realize the crack electron beam repair welding of the large-thickness plate in a flat plate state, solves the technical problems of high labor intensity, low efficiency and poor repair welding effect caused by TIG manual welding, but also is suitable for the crack electron beam repair welding of the curved-surface plate.
With reference to the attached drawings 2-12, the electron beam repair welding method for the through crack of the large-thickness plate in the curved surface state comprises the following steps:
(1) Repair welding process for through cracks
Aiming at the characteristics of the cracks, an electronic repair welding process for the plate penetrating the cracks in a curved surface state is developed.
1) Making auxiliary line and punching point at crack position
As shown in fig. 2, firstly, an auxiliary line is made at one end of the crack, the auxiliary line is parallel to the original welding direction of the welding seam, and a tap is used to strike a point on the surface of the plate at intervals of L by the aid of the auxiliary line, wherein L is usually 5-8 mm, and the striking points are uniformly distributed along the auxiliary line, so that the crack is clear and bright under a camera, and subsequent trajectory teaching is facilitated.
And then clamping the arc extinguishing plate at the arc ending end of the repair welding seam to ensure that the repair welding arc ending position falls on the arc extinguishing plate and prevent pits from appearing on the surface of the plate.
2) Camera trajectory demonstration
After the vacuumizing is finished, track teaching is carried out under the camera, wherein an arc starting point is located at the front of the crack tip by a distance L ', L' is about 50mm, an arc closing point is located on an arc extinguishing plate, and 5 points are taught to ensure track accuracy.
3) Repair welding of through cracks
Crack repair welding is based on the following method:
adopting a repair welding method of 2 welding seams on the front surface and 2 welding seams on the back surface for repair welding, wherein for the through crack with the depth of B, the depth of the welding seam is B 1 The following requirements should be met:
2 welding seam center position spacing W 1 During repair welding, the first welding is carried out by taking the original welding direction (length direction) of the welding seam as a reference, and then the first welding is deviated to one side by a distance W 1 And welding the other welding seam, wherein the offset direction is perpendicular to the original welding seam welding direction (along the width direction of the crack), so that the two welding seam regions cover the crack region, and the front side and the back side adopt the method.
For a through crack of width W, the distance W is offset 1 The following requirements should be met:
and after the front face repair welding is finished, turning the plate, and performing repair welding on the back face weld joint. Therefore, adverse effects of multiple heating on tissues near the crack are avoided, and full coverage in the depth direction, the width direction and the length direction of the crack is realized through a repair welding process method of restraining from the crack initiation position and deviating to one side. Wherein, the depth and the offset distance of the welding seam can be adjusted according to the self characteristics of the crack. The crack schematic diagram and repair welding scheme are shown in fig. 4 and 5, and the repair welding test effect for a curved plate with the thickness of 53mm is shown in fig. 6.
4) Post-treatment of weld
And milling the weld joint surface residual height and the arc striking plate after welding, and leveling the weld joint surface residual height and the arc striking plate with the height of the base metal to finish the whole repair welding work of the plate.
The repair welding process has the following advantages:
1) Compared with the traditional TIG repair welding method, the whole repair welding process is carried out in a vacuum chamber, harmful gas is prevented from invading a molten pool, the welding seam has pure components, and in addition, because of the difference of the welding methods, tungsten electrode burning loss is not generated, and further the defects of air holes and tungsten inclusion in the welding seam are avoided.
2) The electron beam repair welding has high energy density, concentrated heat input and deeper fusion depth compared with other welding methods, can effectively reduce repair welding times, avoids serious welding deformation and welding stress caused by multilayer multi-pass welding, and can also improve welding efficiency to a certain extent.
3) By means of the double-side and multi-pass repair welding method, the repair welding width is remarkably improved, complete repair welding of the penetrating cracks with a certain width can be achieved, and the condition of internal missing welding cannot occur after welding.
4) The arc extinguishing plate is clamped at the arc closing end of the repair welding seam, the arc closing end is led to the arc extinguishing plate, and the plate welding seam collapse and the arc extinguishing cracks caused by repair welding arc closing are effectively avoided.
(2) Crack repair welding method for curved plate
The electron beam repair welding of the plate in a curved surface state relates to multi-axis synchronous motion, a numerical control teaching program is complicatedly written, inconsistency of welding parameters in the length direction is easily caused, and finally performance nonuniformity after the repair welding of the plate is fed back, so the invention provides the simulated plane repair welding method.
As shown in FIG. 7, when performing the repair welding on the concave side of the curved surface, a backing plate is additionally arranged at the bottom of the curved surface, and the length L of the backing plate 1 And height H 1 The actual adjustment can be carried out according to the crack position and the curvature radius of the curved surface, so that the crack position is kept in a planar state as much as possible, and the multi-axis motion of the electron gun is avoided as much as possible.
Wherein, for the height of the base plate, the following measuring methods are adopted:
for a curved surface with a large curvature radius, the curved surface can be approximate to a spherical surface when the electron beam repair welding engineering is applied, namely the curvature radius R is equal at each part of the curved surface.
The curvature radius of the central point of the curved surface is R, and the arc length A of the crack from the central point is measured by taking the central point as a starting point 1 Then the included angle theta between the connecting line of the crack and the sphere center and the connecting line of the curved surface center and the sphere center in the figure can be obtained 1 As shown in fig. 7.
Wherein:
obviously, the repaired curved surface rotates by the angle theta 1 Then, the crack can reach a planar state, i.e. the tangent of the curved surface at the crack is perpendicular to the electron gun direction, as shown in fig. 8.
By means of crown block or the like to rotate the curved surface by theta 1 After reaching the plane state, taking the center point of the curved surface as a starting point, measuring the arc length A of the distance between the backing plate and the contact surface of the curved surface and the center point 2 ，A 2 Not too long, otherwise, the height H of the base plate is selected 1 Will be too high, generally select A 2 Is 200-300 mm.
Measuring arc length A 2 Then, taking one side of the arc length far from the central point as a vertical line to the horizontal plane, and measuring the distance H 1 Namely selecting the height of the cushion plate.
To maintain the stability of the curved plate, the backing plate should be located on the left side of the center point of the curved surface, and then the following formula is provided: h 1 ≥R-Rcosθ 1 (4-4)
In summary, the padHeight H of the plate 1 Should satisfy the formulas (4-4) and A 2 Condition of 200 to 300mm.
Length L of the backing plate 1 Stability after lifting of the curved surface, L 1 Generally 500-1000 mm is selected, as shown in FIG. 8.
Before welding, the vertical height H' of the crack position and the curved surface edge is measured, as shown in FIG. 9, the working distance of the electron gun, i.e. the vertical distance H between the emission end of the gun body and the crack position 2 It is determined comprehensively according to the process parameters and H', and comprises the following steps:
H 2 ≥H'(4-5)
in a specific embodiment, the height H of the backing plate is set for the repair welding of a concave curved plate with the thickness of 53mm 1 Is 240mm, length L 1 700mm, the height H of the electron gun is set 2 500mm, the process parameters are shown in Table 1:
TABLE 1 welding parameters (500 mm)
When the repair welding is carried out on the convex side of the curved surface, a backing plate is required to be additionally arranged on the edge side of the curved surface, and the length L of the backing plate 2 And height H 3 The actual adjustment can be carried out according to the crack position and the curvature of the curved surface, so that the crack position is kept in a plane state as much as possible.
Wherein, for the height of the base plate, the following measuring method is adopted:
for a curved surface with a larger curvature radius, the curved surface can be approximate to a spherical surface when the electron beam repair welding engineering is applied, namely the curvature radius R is equal at each part of the curved surface.
Measuring the curvature radius of the central point of the curved surface to be R, and the height of the central point of the flat arranged curved surface (namely the distance between the central point of the curved surface and the workbench when the plate is arranged on the workbench in a flat manner) H * . Measuring the arc length A of the crack from the central point by taking the central point as a starting point 3 Then the included angle theta between the connecting line of the crack and the sphere center and the connecting line of the curved surface center and the sphere center in the figure can be obtained 2 As shown in fig. 10.
Wherein the included angle theta 2 The formula is as follows:
obviously, the rotation angle theta of the repair-welded curved surface 2 The crack then reaches a planar state, as shown in fig. 11. At this time, the height H' of the crack position from the horizontal plane is measured.
In order to maintain the stability of the curved surface plate and control the height of the backing plate, the contact position of the backing plate and the curved surface plate is positioned at the arc length A 3 Within the range, the height H of the base plate 3 There is the formula:
length L of the backing plate 2 Stability after lifting of the curved surface, L 2 Generally 1000-1500 mm is selected.
Working distance H of electron gun 4 Should be based on the electron gun's extreme working distance H max Determined as shown in fig. 12.
Namely, the method comprises the following steps:
H 4 ≥H max -H"(4-8)
in a preferred embodiment, the height H of the backing plate is set for the repair welding of a concave curved plate with the thickness of 53mm 3 Is 400mm, length L 2 Is 1000mm, and the height H of the electron gun is set 4 300mm, the process parameters are shown in table 2:
TABLE 2 welding parameters (300 mm)
In conclusion, the simulated plane electron beam repair welding of the large-thickness plate in the curved surface state is realized.
The repair welding process has the following advantages:
1) The repair welding under the curved surface state is converted into the plane state by additionally arranging the base plate, the establishment of a complex welding program is effectively avoided, meanwhile, the repair welding is converted into the plane welding from the curved surface climbing welding, the influence of gravity on the molten pool state is reduced to the maximum extent, the welded welding seam is attractive in shape, and the mechanical property is uniform.
2) The leveling of the curved-surface plate can be realized only by the backing plate with a certain thickness, any complex tool is not needed, the operation is simple and convenient, the cost is low, and the welding efficiency is high.
3) The relation and the regular expression of the position of the base plate and the crack are summarized, the size of the base plate can be accurately controlled, the stability of the welding process is improved, and a large amount of trial-and-error cost is avoided.
The method is suitable for repair welding of the through cracks of the large-thickness plate with the thickness of 30-60 mm.
The invention has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to be construed in a limiting sense. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its embodiments without departing from the spirit and scope of the present invention, which fall within the scope of the present invention. The scope of the invention is defined by the appended claims.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (10)
1. An electron beam repair welding method for a large-thickness plate through crack is characterized by comprising the following steps:
performing repair welding on the front surface of the plate twice to form two welding seams, wherein the first welding seam passes through one end of the crack and is parallel to the welding direction of the original welding seam, and the second welding seam is deviated along the width direction of the crack in a state of being parallel to the first welding seam, so that the first welding seam and the second welding seam cover the crack;
and turning the plate, and performing repair welding twice on the back of the plate to form two welding seams, wherein the first welding seam passes through one end of the crack and is parallel to the welding direction of the original welding seam, and the second welding seam is deviated along the width direction of the crack in a state of being parallel to the first welding seam, so that the first welding seam and the second welding seam cover the crack.
2. The electron beam repair welding method for through crack of large-thickness plate as claimed in claim 1, wherein for the crack with width W, the second weld is shifted in the width direction of the crack by a distance W while keeping the first weld parallel to the second weld 1 ，W 1 Satisfies the following relation:
3. the electron beam repair welding method for through crack of large-thickness plate as claimed in claim 1, wherein for the crack with the depth of B, the depth B of the first welding seam and the second welding seam is 1 Satisfies the following relation:
4. the electron beam repair welding method for the through cracks of the large-thickness plate as claimed in claim 1, wherein when the first repair welding is carried out on the front side or the back side of the plate, the following steps are carried out:
making an auxiliary line parallel to the original welding direction of the welding seam at one end of the crack, and arranging a plurality of punching points along the auxiliary line;
determining a repair welding arc ending point and an arc starting point;
selecting at least one of the plurality of impact points, an arc ending point and an arc starting point as teaching points;
and (3) performing repair welding by using teaching points under the camera and adopting a track teaching mode to obtain a first welding line.
5. The electron beam repair welding method for the through cracks of the large-thickness plate as claimed in claim 4, wherein the punching points are formed by knocking the surface of the plate by using a screw tap, the distance L between every two adjacent punching points is 5-8 mm, and a plurality of punching points are uniformly distributed along an auxiliary line.
6. The electron beam repair welding method for penetrating cracks in large-thickness plates according to claim 5, wherein the arc ending point falls on the arc ending plate, the arc starting point is located in front of one end of each crack, and the distance L' between the arc starting point and one end of each crack is 48-53 mm.
7. The electron beam repair welding method for penetrating cracks in large-thickness plates according to claim 1, wherein when the plates are in a curved surface state, the plates are padded on one side of the plates by using a backing plate, so that the section of the position of the crack is perpendicular to the direction of an electron gun;
the backing plate and the crack are respectively positioned at two sides of the center point of the curved surface.
8. The electron beam repair welding method for through cracks of large-thickness plates as claimed in claim 7, wherein the height H of the backing plate is equal to the height H of the concave surface of the plate when the repair welding is carried out on the concave surface of the plate 1 The following formula is satisfied:
H 1 ≥R-Rcosθ 1
wherein R is the curvature radius of the center point of the curved surface, theta 1 The included angles of the connecting line of the crack and the sphere center and the connecting line of the curved surface central point and the sphere center are included;
the arc length between the contact position of the backing plate and the curved surface and the central point of the curved surface is 200-300 mm;
length L of the backing plate 1 500-1000 mm.
9. The electron beam repair welding method for through cracks of large-thickness plates as claimed in claim 7, wherein when the repair welding is performed on the convex surface of the plate, the height H of the backing plate is 3 The following formula is satisfied:
wherein H * The height of the central point of the curved surface when the plate is horizontally placed, H' is the height of the curved surface tangent line at the crack from the horizontal worktable when the curved surface tangent line is vertical to the direction of the electron gun, R is the curvature radius of the central point of the curved surface, theta 2 The included angles of the connecting line of the crack and the sphere center and the connecting line of the curved surface central point and the sphere center are included;
length L of the backing plate 2 1000-1500 mm.
10. The electron beam repair welding method for penetrating cracks in large-thickness plate material as claimed in claim 7, wherein when the repair welding is performed on the concave surface of the plate material, the working distance H of an electron gun is set 2 The distance H 'between the crack and the edge of the curved surface along the direction of the electron gun is larger than the distance H';
when repair welding is carried out on the convex surface of the plate, the working distance H of the electron gun 4 ≥H max -H ", wherein H max And H' is the height of the crack from the horizontal workbench when the tangent line of the curved surface at the crack is vertical to the direction of the electron gun.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116441696A (en) * | 2023-06-19 | 2023-07-18 | 中国航发成都发动机有限公司 | Vacuum electron beam welding method and clamping device for stator assembly of aero-engine |
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2022
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116441696A (en) * | 2023-06-19 | 2023-07-18 | 中国航发成都发动机有限公司 | Vacuum electron beam welding method and clamping device for stator assembly of aero-engine |
| CN116441696B (en) * | 2023-06-19 | 2023-09-15 | 中国航发成都发动机有限公司 | Vacuum electron beam welding method and clamping device for stator assembly of aero-engine |
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