CN108608097A - A kind of vertical weld bond one side welding with back formation welding method of common downcomer heavy wall - Google Patents
A kind of vertical weld bond one side welding with back formation welding method of common downcomer heavy wall Download PDFInfo
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- CN108608097A CN108608097A CN201810686611.4A CN201810686611A CN108608097A CN 108608097 A CN108608097 A CN 108608097A CN 201810686611 A CN201810686611 A CN 201810686611A CN 108608097 A CN108608097 A CN 108608097A
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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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
Abstract
The present invention provides a kind of vertical weld bond one side welding with back formation welding methods of common downcomer heavy wall; using the method for carbon dioxide flux-cored wire combination inert gas tungsten electrode protection weldering; it first carries out backing welding and forms prime coat; layer welding is filled above prime coat afterwards; and keep being heated evenly for prime coat and upper groove and lower groove; multiple thickening layers are welded on filled layer; refuse is carried out to last layer welding point when welding; and multiple thickening layers are staggered, then capping layer is welded above thickening layer.The method that the present invention uses carbon dioxide flux-cored wire and inert gas-shielded arc welding; the gentle double shielding of slag at weld bond when realizing welding; and realize multiple welders in multiple position synchronous weldings; it is effectively improved the welding efficiency and welding quality of common downcomer; avoid production equipment, resource, the waste in working hour caused by largely being reprocessed after welding; and while construction period has been greatly shortened, construction cost is reduced.
Description
Technical field
The present invention relates to common downcomer welding fabrication technical fields, specifically, being related to a kind of common downcomer heavy wall
Vertical weld bond one side welding with back formation welding method.
Background technology
In water circulation system, when flow head keeps certain, then when the resistance of down-comer is smaller, rate of circulating flow is also got over
Height can make the state of water screen tube more stablize in this way, be easy to improve the stability of water screen tube and extend water-cooling wall
The service life of pipe.However as the raising of boiler working pressure, the density contrast of water and vapour is reduced, in order to ensure certain cycle
Flow velocity takes arranging for many reduction circulation loop flow resistances so that water screen tube is well cooled down in prior art
It applies, is exactly one of therein using major diameter common downcomer.
Common downcomer improves decline passway for being connected to water-cooling wall header up and down for steam Natural Circulation.Existing
In boiler common downcomer welding procedure, the solid argon arc welding wire of generally use and welding rod are welded, however existing this are adopted
The mode that common downcomer is welded with argon arc welding wire and welding rod has a variety of defects：
1) the fusing amount of metal of solid argon arc welding wire is more, and welding contracted quantity is big, when backing weld to integral solder thickness
3/4ths when, the weld gap at weld bond at this time is already less than gage of wire at this time, then in rear a quarter thickness
Welding process in, lower groove back of weld root is susceptible to phenomena such as molten, uneven；
2) in existing welding procedure, it is desirable that in welding rod striking fusion process, first three drop molten iron of welding rod fusing cannot
There are in weld seam, because it is easy to generate stomata and/or porosity in welding；On the other hand, the Welder of the prior art
In skill, due to being limited by welding rod length, welding point is excessive in welding process, can also cause intensive gas occur in welding
Hole, or even have slag inclusion phenomenon, the above-mentioned this stomata and/or porosity that when welding generates can be with fusing weld seams until whole
Welding electrode binding beam then further impacts down-comer integral solder quality, and the qualification rate by ultrasound examination is logical
Often it is no more than 60%, the case where largely reprocessing then occurs.
Based on above-mentioned reason, the common downcomer welding procedure under the prior art is difficult to ensure integrated engineering quality, again
Because there is the case where largely reprocessing, welding procedure and rework process cause integrated engineering largely to lag.Meanwhile also based on upper
The common downcomer welding procedure stated under the reason prior art also expends a large amount of working hours, causes the constructions money such as equipment, artificial, material
The significant wastage in source.
In view of this, should be improved to the prior art, to solve the above-mentioned technical problems in the prior art.
Invention content
In order to solve the above-mentioned technical problem the present invention makes, the purpose is to provide one kind to realize that slag is gentle double
Layer weld bond protection, it is only necessary to which single-sided welding can be realized in weld bond two-sides forming, significantly too high speed of welding, save working hour, material
Material and the vertical weld bond one side welding with back formation weldering of the common downcomer heavy wall that common downcomer welding quality can be further increased
Connect method.
To achieve the goals above, the present invention provides a kind of vertical weld bond one side welding with back formation of common downcomer heavy wall
Welding method, this approach includes the following steps：S1, the side for welding carbon dioxide flux-cored wire using the protection of inert gas tungsten electrode
Method, at the vertical weld bond of common downcomer heavy wall on groove striking, under keeping welding gun synchronous with the carbon dioxide flux-cored wire
Progress bottoming welding at lower groove is drawn and be moved to, arc is then ceased；After the completion of S2, prime coat welding, in the prime coat under
Lower filled layer is welded at groove fusion, and returns to initial weld position after a week along the welding of vertical weld bond, and melts initial weld seam
More than ceasing arc after preset length；S3, upper filled layer is welded at the prime coat and upper groove fusion, and welded along vertical weld bond
It connects and returns to initial weld position breath arc after a week, the upper filled layer is staggered with the lower filled layer after welding, and in it
Between form slight concave；S4, welding wire is extended into the lower filled layer and groove fusion, in the lower filled layer and down-comer
Striking after moving predetermined interval to weld bond opening direction at Wall Joint is melted the lower filled layer and is welded along vertical weld bond
After a week to initial weld position, and initial weld seam is melted more than arc is ceased after preset length, the first thickening layer is formed, then in institute
The first thickening layer and the lower filled layer joint are stated, according to default spacing, adjustment angle of welding gun welds one week along vertical weld bond
The second thickening layer is formed, angle of welding gun is adjusted again in second thickening layer and the upper filled layer connector according to default spacing
It is welded one week along vertical weld bond and forms third thickening layer in place；S5, it is thickeied in first thickening layer, the second thickening layer and third
On layer, cover welding is carried out respectively according to predetermined interval, forms capping layer.
Preferably, in the step S1, welding wire is held and towards palm of the hand inside rotationally by the carbon dioxide medicine core
Welding wire extends to the back side of vertical weld bond upward slope mouth edges and corners base material, and high-frequency arc strike method striking may be used, then can be to hang down
Cut outer corners edge is slided for fulcrum under straight weld bond.
Preferably, in the step S1, welding gun and the carbon dioxide flux-cored wire are pulled down at lower groove, and can be with
It stops and heats according to preset time at the lower groove, can decay breath arc when ceasing arc at lower groove position.
Preferably, in the step S2, preset length can be in the range of 8mm to 12mm.
Preferably, in the step S4, predetermined interval can be in the range of 80mm to 110mm, and default spacing can be with
In the range of 25mm to 35mm, when welding first thickening layer, the angle between welding gun and vertical direction can be 100 °,
When welding second thickening layer, angle of welding gun can be adjusted to 90 °, when welding the third thickening layer, welding gun can be adjusted
Angle is to 80 °.
Preferably, it in the step S4, can be welded in first thickening layer, the second thickening layer and third thickening layer
After the completion of connecing, thickeied in layer surface in first thickening layer, the second thickening layer, third, keep same soldering angle,
Welding parameter and welding method weld multiple thickening layers.
Preferably, in the step S1 to step S5, more people may be used and be symmetrically welded, multiple welding personnels can be from
Multiple positions of the vertical weld bond of common downcomer heavy wall synchronize welding.
Preferably, in the step S1 to step S5, the thickness of the upper filled layer and the lower filled layer can be small
In first thickening layer, the thickness of the second thickening layer, third thickening layer and capping layer.
As described above with practice it is found that the vertical weld bond single face welding and double face of common downcomer heavy wall of the present invention
In forming welding method, using the welding method of carbon dioxide welding wire combination inert gas tungsten electrode protection weldering, in common downcomer
Vertical weld bond at carry out backing welding, keep welding gun is synchronouss with welding wire to be pulled down to lower groove from upper groove, formation prime coat,
In, the following groove outer corners of welding wire are slided as fulcrum, and to avoid welding wire, remaining years shaking can collide tungsten in the welding process
Stick further results in welding plus tungsten defect, also, in the downdraw process of welding gun and welding wire, due to gravity under the molten iron of molten bath
Pendant connects and forms molten bath, and the stop of certain time is done to prevent to occur welding root at lower groove not after being moved to lower groove
Molten defect decays in lower groove center when ceasing arc and ceases arc, in this way, the temperature in welding gun moving process at groove gradually drops
It is low, it will not generate bubble or shrinkage cavity in breath arc position after ceasing arc；Then, it is taken up in order of priority to merge with lower groove in prime coat and sentence
And the prime coat and lower filled layer of the upper groove place of fusion welding and upper filled layer, when welding, keep prime coat and upper groove and lower groove
Place is heated evenly, then continues in filled layer to weld multiple thickening layers, and when welding striking position according to preset spacing and
Length carries out so that multiple thickening layers are staggered, and form multiple indents to its upper, are all welded to last layer when each striking
It connects joint and carries out refuse, the phenomenon that can making weld appearance uniformity in this way, be not in weld seam out-of-flatness, and
The weld seam of initial position is melted according to preset length when breath arc every time；Finally, in continuing to weld on the surface of thickening layer
Capping layer, capping layer are divided into multi-pass welding, and the angle of welding gun and vertical direction is all gradually reduced when the welding of each road capping,
So that multiple tracks capping layer interlocks, and make weld reinforcement and width uniformity.In addition, declining in concentration of the present invention
In the vertical weld bond one side welding with back formation welding method of thickness of pipe wall, multiple operating personnel can be multiple along concentrating tube wall to be distributed in
Position, and in the same manner, step synchronize welding.In conclusion in common downcomer of the present invention thickness
In the vertical weld bond single face welding and double face shaping welding method of wall, using the side of carbon dioxide flux-cored wire and inert gas-shielded arc welding
Method, the gentle double shielding of slag at weld bond when realizing welding, and realize that multiple welders in multiple position synchronous weldings, effectively improve
The welding efficiency and welding quality of common downcomer avoids production equipment caused by largely reprocessing after welding, resource, working hour
While wasting, and construction period has been greatly shortened, construction cost is reduced.
Description of the drawings
Fig. 1 is sectional view, shows the vertical weld bond list of common downcomer heavy wall described in one embodiment of the present of invention
Face is welded in two-sides forming welding method, sectional structure when welding at weld bond；
Fig. 2 is sectional view, shows the vertical weld bond list of common downcomer heavy wall described in one embodiment of the present of invention
Face is welded in two-sides forming welding method, and the sectional structure of prime coat is welded in weld bond；
Fig. 3 is sectional view, shows the vertical weld bond one side welding with back formation of common downcomer heavy wall shown in Fig. 2 welding side
In the sectional structure for welding upper filled layer and lower filled layer on prime coat in method；
Fig. 4 is sectional view, shows the vertical weld bond one side welding with back formation of common downcomer heavy wall shown in Fig. 2 welding side
In method, the sectional structure after welding fabrication at weld bond.
Specific implementation mode
The vertical weld bond one side welding with back formation of common downcomer heavy wall of the present invention described below with reference to the accompanying drawings
The embodiment of welding method.Those skilled in the art will recognize, without departing from the spirit and scope of the present invention
In the case of, the described embodiments may be modified in various different ways.Therefore, attached drawing and description be inherently
It is illustrative, it is not intended to limit the scope of the claims.In addition, in the present specification, attached drawing is drawn not in scale,
And identical reference numeral indicates identical part.
Fig. 1 is sectional view, shows the vertical weld bond list of common downcomer heavy wall described in one embodiment of the present of invention
Face is welded in two-sides forming welding method, sectional structure when welding at weld bond.As shown in Figure 1, in one embodiment of the present of invention
Described in the vertical weld bond one side welding with back formation welding method of common downcomer heavy wall in, weld bond 1 takes the shape of the letter U, root face 2 be 2
Millimeter, 5 millimeters of weld gap inside fill out a diameter of 1.2 millimeters of carbon dioxide medicine core using a diameter of 2 millimeters of argon arc welding wire 3.
When welding, welding wire 3 tilts, and it is 45° angle to keep the angle of itself and upper groove 4, hold welding wire 3 and towards on the inside of the palm of the hand rotationally
Welding wire 3 is extended to the back side of 4 edges and corners base material of groove on weld bond 1.It then uses high-frequency arc strike method in carrying out striking herein, welds
When connecing, welding wire 3 is slided for 1 one weeks using 1 time groove of weld bond, 5 outer corners edge as fulcrum, along weld bond.In this way, can keep away
Exempt to generate shaking when welding wire moves in the welding process, adds tungsten defect so that being generated in welding position after colliding tungsten bar.Striking
Afterwards, it while melting base material and welding wire 3, controls argon arc welding gun and welding wire synchronizes drop-down, at this point, molten iron is in gravity
It drops and connects fusing and form molten bath.After argon arc welding gun and welding wire 3 are pulled down at lower groove 5, stopped at lower groove
Several seconds, to prevent to generate the not molten defect in root at lower groove 5.In addition, arc is ceased each time in the welding process, all in lower groove
5 center positions carry out decaying breath arc, in this way, groove temperature continuously decreases in welding gun moving process, are produced to avoid at breath arc
Anger bubble and shrinkage cavity.When welding point, after previous welding breath arc position moves 10 millimeters to the direction opposite with welding direction
Previous weld seam is melted in striking again, occurs uneven phenomenon at welding point to reduce.
Fig. 2 is sectional view, shows the vertical weld bond list of common downcomer heavy wall described in one embodiment of the present of invention
Face is welded in two-sides forming welding method, and the sectional structure of prime coat is welded in weld bond.As shown in Fig. 2, having been welded within 1 one weeks along weld bond
Prime coat 6 is formed in weld bond 1 after, after the completion of bottoming welding, the lower filling of welding is breathed out at prime coat 6 and lower 5 fusion of groove
Layer 7, the hexagonal angle at this point, welding gun leans forward, and prime coat 6 and lower groove 5 are heated evenly, it is welded after a week in along weld bond 1
Behind beginning welding position, arc is ceased after melting initial position according to preset length, in this way, welding quality can be further increased so that
Welding effect is uniform.Then, upper filled layer 8 is welded at 4 fusion of prime coat 6 and upper groove, keeps 70 ° of angles of welding gun layback, and
Initial position is returned to after a week along the welding of weld bond 1.As shown in Fig. 2, upper filled layer 8 and lower filled layer 7 are staggered, and in its it
Between form slight concave.
Fig. 3 is sectional view, shows the vertical weld bond one side welding with back formation of common downcomer heavy wall shown in Fig. 2 welding side
In the sectional structure for welding upper filled layer and lower filled layer on prime coat in method.As shown in figure 3, upper filled layer 8 and lower filled layer 7
After the completion of welding, welding wire is extended into lower filled layer 7 and groove fusion, holding angle of welding gun is 100 ° of angles, in lower filled layer 7 with
Striking after moving predetermined interval to weld bond opening direction at down-comer Wall Joint melts lower filled layer 7 and along vertical weld bond
After a week to initial weld position, the initial weld seam of re-melting forms the first thickening layer 9 more than arc is ceased after preset length for welding.
Then in the first thickening layer 9 and lower 7 joint of filled layer, it is staggered default spacing with the first thickening layer 9, adjusts welding gun
Angle is 90 ° of angles, and then weld one week the second thickening layer 10 of formation along vertical weld bond then adjusts according to default spacing again
Angle of welding gun is 80 ° of angles, and welding one week formation third along vertical weld bond 1 with 8 joint of upper filled layer in the second thickening layer 10 adds
Thick-layer 11.Predetermined interval in the range of 80 millimeters to 110 millimeters, in the range of 8 millimeters to 12 millimeters preset by preset length
Spacing is in the range of 25 millimeters to 35 millimeters, and in this embodiment of the invention, predetermined interval is 100 millimeters, preset length
It it is 10 millimeters, it is 30 millimeters to preset spacing.
Fig. 4 is sectional view, shows the vertical weld bond one side welding with back formation of common downcomer heavy wall shown in Fig. 2 welding side
In method, the sectional structure after welding fabrication at weld bond.As shown in figure 4, after the completion of thickening layer welding, in the first thickening layer 9, the
On two thickening layers 10 and third thickening layer 11, cover welding is carried out respectively according to preset interval, forms capping layer 12.At this
In the different embodiments of invention, identical soldering angle, welding parameter, use can be kept identical according to welding needs
Method in welding multiple thickening layers on filled layer.As shown in figure 4, adding in the first thickening layer 9, the second thickening layer 10 and third
Continue to weld thickening layer on thick-layer 11.In addition, when welding, the thickness of filled layer 8 and lower filled layer 7 is less than first and thickeies in holding
The thickness of the 9, second thickening layer 10 of layer, third thickening layer 11 and capping layer 12 thus is avoided that in welding process that puncturing argon arc welding beats
Bottom generates unnecessary weld defect.
In other embodiments of the invention, more people may be used to be symmetrically welded, multiple welding personnels are from common downcomer
Multiple positions of the vertical weld bond of heavy wall synchronize welding.
As described above with practice it is found that the vertical weld bond single face welding and double face of common downcomer heavy wall of the present invention
In forming welding method, using the welding method of carbon dioxide welding wire combination inert gas tungsten electrode protection weldering, in common downcomer
Vertical weld bond at carry out backing welding, keep welding gun is synchronouss with welding wire to be pulled down to lower groove from upper groove, formation prime coat,
In, the following groove outer corners of welding wire are slided as fulcrum, and to avoid welding wire, remaining years shaking can collide tungsten in the welding process
Stick further results in welding plus tungsten defect, also, in the downdraw process of welding gun and welding wire, due to gravity under the molten iron of molten bath
Pendant connects and forms molten bath, and the stop of certain time is done to prevent to occur welding root at lower groove not after being moved to lower groove
Molten defect decays in lower groove center when ceasing arc and ceases arc, in this way, the temperature in welding gun moving process at groove gradually drops
It is low, it will not generate bubble or shrinkage cavity in breath arc position after ceasing arc；Then, it is taken up in order of priority to merge with lower groove in prime coat and sentence
And the prime coat and lower filled layer of the upper groove place of fusion welding and upper filled layer, when welding, keep prime coat and upper groove and lower groove
Place is heated evenly, then continues in filled layer to weld multiple thickening layers, and when welding striking position according to preset spacing and
Length carries out so that multiple thickening layers are staggered, and form multiple indents to its upper, are all welded to last layer when each striking
It connects joint and carries out refuse, the phenomenon that can making weld appearance uniformity in this way, be not in weld seam out-of-flatness, and
The weld seam of initial position is melted according to preset length when breath arc every time；Finally, in continuing to weld on the surface of thickening layer
Capping layer, capping layer are divided into multi-pass welding, and the angle of welding gun and vertical direction is all gradually reduced when the welding of each road capping,
So that multiple tracks capping layer interlocks, and make weld reinforcement and width uniformity.In addition, declining in concentration of the present invention
In the vertical weld bond one side welding with back formation welding method of thickness of pipe wall, multiple operating personnel can be multiple along concentrating tube wall to be distributed in
Position, and in the same manner, step synchronize welding.In conclusion in common downcomer of the present invention thickness
In the vertical weld bond single face welding and double face shaping welding method of wall, using the side of carbon dioxide flux-cored wire and inert gas-shielded arc welding
Method, the gentle double shielding of slag at weld bond when realizing welding, and realize that multiple welders in multiple position synchronous weldings, effectively improve
The welding efficiency and welding quality of common downcomer avoids production equipment caused by largely reprocessing after welding, resource, working hour
While wasting, and construction period has been greatly shortened, construction cost is reduced.
Describe the vertical weld bond of common downcomer heavy wall according to the present invention in an illustrative manner above with reference to attached drawing
One side welding with back formation welding method.It will be understood by those skilled in the art, however, that the concentration proposed for aforementioned present invention
The vertical weld bond one side welding with back formation welding method of down-comer heavy wall, can also make on the basis of not departing from the content of present invention
Various improvement.Therefore, protection scope of the present invention should be determined by the content of appended claims.
Claims (8)
1. a kind of vertical weld bond one side welding with back formation welding method of common downcomer heavy wall, which is characterized in that this method includes
Following steps：
S1, the method for welding carbon dioxide flux-cored wire using the protection of inert gas tungsten electrode, in common downcomer heavy wall vertical welding
Upper groove striking at mouthful keeps welding gun drop-down synchronous with the carbon dioxide flux-cored wire and is moved to progress bottoming at lower groove
Welding, then ceases arc；
After the completion of S2, prime coat welding, lower filled layer is welded at the prime coat and lower groove fusion, and weld along vertical weld bond
It connects and returns to initial weld position after a week, and melt initial weld seam more than ceasing arc after preset length；
S3, upper filled layer is welded at the prime coat and upper groove fusion, and returned to after a week just along the welding of vertical weld bond
Beginning welding position ceases arc, and the upper filled layer is staggered with the lower filled layer after welding, and slight interior in being formed between it
It is recessed；
S4, welding wire is extended into the lower filled layer and groove fusion, at the lower filled layer and down-comer Wall Joint to
Weld bond opening direction moves striking after predetermined interval, melts the lower filled layer and is welded after a week to initial along vertical weld bond
Welding position, and initial weld seam is melted more than arc is ceased after preset length, the first thickening layer is formed, then in first thickening layer
With the lower filled layer joint, according to default spacing, adjustment angle of welding gun welds along vertical weld bond and forms within one week the second thickening
Layer, according to default spacing adjust again angle of welding gun in second thickening layer with the upper filled layer joint along vertical weld bond
Welding forms third thickening layer in one week；
S5, on first thickening layer, the second thickening layer and third thickening layer, carry out cosmetic welding respectively according to predetermined interval
It connects, forms capping layer.
2. the vertical weld bond single face welding and double face shaping welding method of common downcomer heavy wall as described in claim 1, feature exist
In in the step S1, hand-held welding wire simultaneously rotationally extends to the carbon dioxide flux-cored wire vertically towards palm of the hand inside
The back side of groove edges and corners base material on weld bond, using high-frequency arc strike method striking, then with cut outer corners under vertical weld bond
It is slided for fulcrum edge.
3. the vertical weld bond single face welding and double face shaping welding method of common downcomer heavy wall as described in claim 1, feature exist
In in the step S1, welding gun is pulled down to the carbon dioxide flux-cored wire at lower groove, and is pressed at the lower groove
It stops and heats according to preset time, decaying ceases arc at lower groove position when ceasing arc.
4. the vertical weld bond single face welding and double face shaping welding method of common downcomer heavy wall as described in claim 1, feature exist
In in the step S2, preset length is in the range of 8mm to 12mm.
5. the vertical weld bond single face welding and double face shaping welding method of common downcomer heavy wall as described in claim 1, feature exist
In, in the step S4, predetermined interval presets spacing in the range of 25mm to 35mm in the range of 80mm to 110mm,
When welding first thickening layer, the angle between welding gun and vertical direction is 100 °, when welding second thickening layer, adjustment
Angle of welding gun is to 90 °, and when welding the third thickening layer, adjustment angle of welding gun is 80 °.
6. the vertical weld bond single face welding and double face shaping welding method of common downcomer heavy wall as described in claim 1, feature exist
In in the step S4, after the completion of first thickening layer, the second thickening layer and third thickening layer weld, in described
First thickening layer, the second thickening layer, third thicken in layer surface, keep same soldering angle, welding parameter and welding
Method welds multiple thickening layers.
7. the vertical weld bond single face welding and double face shaping welding method of common downcomer heavy wall as described in claim 1, feature exist
In in the step S1 to step S5, being symmetrically welded using more people, multiple welding personnels are from common downcomer heavy wall vertical welding
Multiple positions of mouth synchronize welding.
8. the vertical weld bond single face welding and double face shaping welding method of common downcomer heavy wall as described in claim 1, feature exist
In, in the step S1 to step S5, the thickness of the upper filled layer and the lower filled layer be less than first thickening layer,
The thickness of second thickening layer, third thickening layer and capping layer.
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| CN201810686611.4A CN108608097B (en) | 2018-06-28 | 2018-06-28 | Single-side welding and double-side forming welding method for thick-wall vertical crater of centralized downcomer |
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| CN201810686611.4A CN108608097B (en) | 2018-06-28 | 2018-06-28 | Single-side welding and double-side forming welding method for thick-wall vertical crater of centralized downcomer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111215776A (en) * | 2019-11-11 | 2020-06-02 | 中国化学工程第六建设有限公司 | Full-position automatic welding method for P91 high-pressure thick-wall pipeline |
| CN114310000A (en) * | 2021-12-31 | 2022-04-12 | 江苏格兰环境科技有限公司 | Composite welding type vinylidene fluoride cracking furnace tube and welding method thereof |
| CN114769792A (en) * | 2022-06-21 | 2022-07-22 | 中国建筑第五工程局有限公司 | Automatic welding method for vertical butt joint of steel pipe columns |
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| CN111215776A (en) * | 2019-11-11 | 2020-06-02 | 中国化学工程第六建设有限公司 | Full-position automatic welding method for P91 high-pressure thick-wall pipeline |
| CN111215776B (en) * | 2019-11-11 | 2022-03-29 | 中国化学工程第六建设有限公司 | Full-position automatic welding method for P91 high-pressure thick-wall pipeline |
| CN114310000A (en) * | 2021-12-31 | 2022-04-12 | 江苏格兰环境科技有限公司 | Composite welding type vinylidene fluoride cracking furnace tube and welding method thereof |
| CN114769792A (en) * | 2022-06-21 | 2022-07-22 | 中国建筑第五工程局有限公司 | Automatic welding method for vertical butt joint of steel pipe columns |
| CN114769792B (en) * | 2022-06-21 | 2022-10-28 | 中国建筑第五工程局有限公司 | Automatic welding method for vertical butt joint of steel pipe columns |
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