CN109202363A - A kind of online build-up welding repair method of grinding roller - Google Patents
A kind of online build-up welding repair method of grinding roller Download PDFInfo
- Publication number
- CN109202363A CN109202363A CN201811338006.4A CN201811338006A CN109202363A CN 109202363 A CN109202363 A CN 109202363A CN 201811338006 A CN201811338006 A CN 201811338006A CN 109202363 A CN109202363 A CN 109202363A
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- China
- Prior art keywords
- welding
- grinding roller
- air
- temperature
- bead
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
-
- 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
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
Abstract
The invention belongs to overlaying method technical fields, in particular to the online build-up welding repair method of a kind of grinding roller, compared with prior art, the present invention lasting to the offer of grinding roller, prolonged heating effect using preheated air and the air that radiates, it efficiently solves the problems, such as various existing for existing online Bead weld repair, the outer surface to be repaired of welding bead and grinding roller is completely embedded, not easily to fall off, and welding bead flawless, wearability meet reparation and require.
Description
Technical field
The invention belongs to overlaying method technical field, in particular to the online build-up welding repair method of a kind of grinding roller.
Background technique
In operation, outer surface with the extruding by material, mill, can inevitably generate abrasion for a long time to grinding roller.With
See the increase of abrasion loss, the yield of grinding machine constantly declines until needing to stop mill maintenance.Using effect is bad or the mill that is not available
Roller can repair its outer surface using the method for built-up welding, since grinding roller generally uses the material system of high rigidity, high abrasion
At, it is not only expensive, and depot repair replacement operation program is complicated, the period is longer, higher cost.
To solve the above-mentioned problems, grinding roller can be repaired by the way of online built-up welding, it, only need to be by heap when reparation
Soldering equipment transports grinding machine use site, in the case where not removing grinding roller, using flux-cored wire to the mill of abrasion in grinding machine
Roller carries out Bead weld repair, since there is no disassembly, transport and assembly grinding roller, can save a large amount of human and material resources and time cost.
But there in practice, have many problem of influencing surfacing quality, safety, progress to be easy to be ignored, so as to cause built-up welding
Quality is undesirable, and progress is impacted, and security risk is more, influences safety in production and maintenance cost.
For example, grinding roller has biggish size and thickness, when being repaired online using traditional built-up welding mode, can not incite somebody to action
The welding position of grinding roller is preheating to suitable temperature before heap solder joint, such as the Chinese patent of Publication No. CN 101433990B
It discloses entire workpiece integral coating and then the method preheated, crawler belt heater by way of coating crawler belt heater
Grinding roller can only be preheated between grinding roll overlaying reparation, the temperature of grinding roller can only position for a period of time, especially grinding roller
Inner surface, temperature decline is especially fast, not can guarantee heating effect whole, lasting when the built-up welding of grinding roller, and then lead to welding bead
Lower or even can not connect with the intensity of grinding roller junction, being easy to fall off of the welding bead that built-up welding is formed, there are crackles, welding bead for welding bead
Phenomena such as not wear-resisting, happens occasionally, and gently then does over again, it is heavy then cause surfacing part fracture, influence reparation progress, increase repair
The consequences such as cost.
The operating location of grinding machine is generally more spacious, and air is affected to the temperature of grinding roller, so that the preheating of the patent
Method is difficult to the online repair suitable for grinding roller.For example, since the time of grinding roll overlaying reparation is longer, in continuous built-up welding
In repair process, pad constantly heats the outer surface of grinding roller, and the temperature of outer surface is caused constantly to increase, grinding roller it is interior
Outer surface forms the larger temperature difference, easily causes grinding roller radial cracking occur, or even burst；For another example, when air themperature is lower, grinding roller
For soldered welding bead by shock chilling function, welding bead is easy to happen the adverse consequences such as tilting, fracture, embrittlement, leads to welding bead and grinding roller
Between, the bonding strength between welding bead and welding bead be lower, Bead weld repair is ineffective or even is unable to complete.
The existing online restorative procedure of grinding roller, there are the built-up welding time is longer, welding bead connective stability is poor, can not be suitable for
The defects of continuous and prolonged Bead weld repair works, so that the online reparation of grinding roller is only in certain circumstances may be used
To use, and it is unable to get popularization and application.
Summary of the invention
The present invention to solve the above-mentioned problems, provides a kind of online build-up welding repair method of grinding roller, using preheated air and
The air that radiates continues the offer of grinding roller, prolonged heating effect, and the outer surface to be repaired of welding bead and grinding roller is completely embedded, no
It is easy to fall off, and welding bead flawless, wearability meet reparation and require.
The present invention is realized using following technical scheme:
S1 clears up the oxide skin of roller surface, the dirt of attachment, while polishing the corner angle of roller surface, advantageously forms
Uniform welding bead；
S2 preheats the roll surface that length before the pad of grinding roller is 300~1600mm by preheated air, and leads to
Heat dissipation air is crossed to radiate to the roll surface that length after the pad of grinding roller is 300~2300mm；
S3, bead welding wire then welds next after being soldered together by the way of multi-layer multi-pass welding on the roll surface polished
Road, until the surface of entire grinding roller is welded full；
S4 after the surface weldering of grinding roller is full, improves the temperature of preheated air to 480~550 DEG C, heat dissipation air themperature is 470
~550 DEG C, after keeping 1~2h of this state, preheated air temperature is improved to 680~750 DEG C, heat dissipation air themperature is 670~750
DEG C, after keeping 1~2h of this state, the temperature of preheated air and the air that radiates is reduced with the speed of 180~220 DEG C/h, works as preheating
After air and heat dissipation 50~70 DEG C of temperature of air, 0.5~1h is kept the temperature, drops grinding roller in the case where not providing heat source and wind regime
It warms to room temperature, then roller surface is machined.
When being repaired using the online build-up welding repair method of grinding roller of the invention to grinding roller, when can be realized continuous, long
Between Bead weld repair work, there is no disassembly, transport and assembling process, a large amount of human and material resources and time cost can be saved, adopted
With preheated air and heat dissipation air continue the offer of grinding roller, prolonged heating effect passes through ladder-elevating temperature in step s 4
Mode eliminate the stress of welding bead and contact roll layer and welding wire is formed by stress between new wearing layer, can
Generated adverse effect when low temperature built-up welding is effectively repaired, the outer surface to be repaired connection of finally formed welding bead and grinding roller is tight
It is close, it is not easily to fall off, and welding bead flawless, wearability meet reparation and require.
In addition, the present invention can reduce the temperature of preheated air and the air that radiates in step s 4 with faster speed, it is real
Now to the fast cooling of grinding roller, efficiently solve the problems, such as that temperature fall time is slower when existing heap is welded in heat treatment operation, further
It reduces and repairs the spent time.
Preferred scheme, when the online build-up welding repair method of the grinding roller works, the relative air humidity in environment is
20%~90%.
When the relative air humidity in environment is more than 85%, pad regional temperature is more than 1300 DEG C, the water in air
Branch forms certain corrosiveness to welding wire in this position, causes the wearability of welding bead to reduce, still, the present invention passes through opposite grinding
The continuous heating of roller can offset influence of the part vapor to grinding roller in air, be particularly suitable for the mill for being 1~1.5m to diameter
Roller is repaired online, and resistance to air humidity effect is preferable.
Preferred scheme, in step S2, the temperature of preheated air is 200~350 DEG C, the temperature for the air that radiates is 160~
340℃.Preheated air can be recycled with heat dissipation air by the pipeline being connected to, and effectively reduced the waste of thermal energy, saved
The expense of Bead weld repair.
Preferred scheme, in step S3, the process parameter control of the bead welding wire are as follows: 460~500A of welding current, weldering
Connecing voltage is 28~32V, 80~130mm/min of speed of welding.Using the online build-up welding repair method of grinding roller of the invention, herein
Under welding condition, heat dissipation air, can be by the pyrolytic conversion of welding generation while taking away the high temperature of pad generation
For the temperature for the air that radiates, heat dissipation air is connected with preheated air by pipeline and is recycled, under this welding condition,
The heat that heat dissipation air absorbs can be reduced spent by heating with the thermal loss of basic neutralisation preheated air during transportation
Thermal energy, the supply difficulty of thermal energy when reducing online reparation.
Preferred scheme, in step S3, every layer of weld width is 6~8mm, with a thickness of 3~5mm.Since the present invention uses
Preheated air and heat dissipation air be continuously grinding roller continue, prolonged heating effect, between welding bead and grinding roller, welding bead and weldering
Being completely embedded between road, the width and thickness of welding bead can obtain larger raising, weld width and thickness compared with the existing technology
Raising, on the one hand ensure that the density of welding bead, enhance the wearability of welding bead, on the other hand, compared with existing string(er) bead,
The intensity of welding bead of the invention is higher, and the connection between adjacent welding bead is closer, gap, decrement between each overlay cladding
It is smaller, thus the service life is longer.
Preferred scheme, in step S3, the welding wire amount of lap of adjacent welding bead is 1/6~1/5.Since the present invention may be implemented
Continuously, built-up welding works for a long time, and in built-up welding work, the temperature of grinding roller entirety overlay cladding is able to maintain that higher temperature,
Compared with prior art, the holding stage time of the invention is only 2~3h, and it is not necessary that grinding roller to be dismantled to installation, nothing from grinding machine
Grinding roller need to be placed in special thermal chamber and carry out heat treatment work, repair time reduction is greatly reduced, for enterprise
Industry reduces production loss.
1, it when being repaired using the online build-up welding repair method of grinding roller of the invention to grinding roller, can be realized continuous, long
The Bead weld repair of time works, and there is no disassembly, transport and assembling process, can save a large amount of human and material resources and time cost,
The offer of grinding roller is continued using preheated air and heat dissipation air, prolonged heating effect, welding bead and grinding roller it is to be repaired outer
Surface is completely embedded, not easily to fall off, and welding bead flawless, wearability meet reparation and require.
2, using the online build-up welding repair method of grinding roller of the invention, the air that radiates is taking away the high temperature of pad generation
Meanwhile, it is capable to by welding generate pyrolytic conversion be radiate air temperature, will heat dissipation air and preheated air pass through pipeline company
It connects and recycles, under this welding condition, the heat that heat dissipation air absorbs can conveyed with basic neutralisation preheated air
Thermal loss in journey reduces the spent thermal energy of heating, the supply difficulty of thermal energy when reducing online reparation.
3, lasting, prolonged heating effect is carried out since the present invention is continuously grinding roller using preheated air and heat dissipation air
Fruit, being completely embedded between welding bead and grinding roller, between welding bead and welding bead, the width and thickness of welding bead can obtain compared with the existing technology
To larger raising, on the one hand the raising of weld width and thickness ensure that the density of welding bead, enhance the wearability of welding bead, separately
On the one hand, compared with existing string(er) bead, the intensity of welding bead of the invention is higher, and the connection between adjacent welding bead is closer, often
Gap, decrement between one overlay cladding is smaller, thus the service life is longer.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the structural schematic diagram of online Bead weld repair ancillary equipment of the invention.
In figure, 1, hot-blast stove；11, air inlet；12, hot gas input port；13, thermal cycle air inlet；2, hot air duct；3, it returns
Closed tube road；4, U-tube；5, steel wire floor.
Specific embodiment
The technical solution in embodiment will be clearly and completely described below.Obviously, described embodiment is only
It is a part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiment of the present invention, ordinary skill people
Member's every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
Embodiment 1
A kind of online build-up welding repair method of grinding roller, includes the following steps:
S1 clears up the oxide skin of roller surface, the dirt of attachment, while polishing the corner angle of roller surface, advantageously forms
Uniform welding bead；
S2, when reparation, the relative air humidity in environment is 20%, the preheated air pair for being 200~220 DEG C by temperature
Length is that the roll surface of 300~1600mm is preheated, and passes through the heat dissipation that temperature is 160~200 DEG C before the pad of grinding roller
Air radiates to the roll surface that length after the pad of grinding roller is 300~2300mm；
S3, bead welding wire, the technique of the bead welding wire are joined by the way of multi-layer multi-pass welding on the roll surface polished
Numerical control is made as: welding current 480A, weldingvoltage 30V, speed of welding 130mm/min, after being soldered together, is then welded next
Road, every layer of weld width is 6mm, and with a thickness of 3mm, the welding wire amount of lap of adjacent welding bead is 1/5, until by the surface of entire grinding roller
Weldering is full；
S4 after the surface weldering of grinding roller is full, improves the temperature of preheated air to 480~490 DEG C, heat dissipation air themperature is 470
~485 DEG C, after keeping this state 2h, preheated air temperature is improved to 680~700 DEG C, heat dissipation air themperature is 670~695 DEG C,
After keeping this state 2h, the temperature of preheated air and the air that radiates is reduced with the speed of 180 DEG C/h, when preheated air and heat dissipation are empty
After the temperature 50 C of gas, 1h is kept the temperature, so that grinding roller is cooled to room temperature in the case where not providing heat source and wind regime, then to grinding roller table
Face is machined.
Embodiment 2
A kind of online build-up welding repair method of grinding roller, includes the following steps:
S1 clears up the oxide skin of roller surface, the dirt of attachment, while polishing the corner angle of roller surface, advantageously forms
Uniform welding bead；
S2, when reparation, the relative air humidity in environment is 60%, the preheated air pair for being 330~350 DEG C by temperature
Length is that the roll surface of 500~1600mm is preheated, and passes through the heat dissipation that temperature is 320~340 DEG C before the pad of grinding roller
Air radiates to the roll surface that length after the pad of grinding roller is 300~1600mm；
S3, bead welding wire, the technique of the bead welding wire are joined by the way of multi-layer multi-pass welding on the roll surface polished
Numerical control is made as: welding current 500A, weldingvoltage 28V, speed of welding 100mm/min, after being soldered together, is then welded next
Road, every layer of weld width is 8mm, and with a thickness of 5mm, the welding wire amount of lap of adjacent welding bead is 1/6, until by the surface of entire grinding roller
Weldering is full；
S4 after the surface weldering of grinding roller is full, improves the temperature of preheated air to 540~550 DEG C, heat dissipation air themperature is 530
~545 DEG C, after keeping this state 1h, preheated air temperature is improved to 740~750 DEG C, heat dissipation air themperature is 730~745 DEG C,
After keeping 1~2h of this state, the temperature of preheated air and the air that radiates is reduced with the speed of 200 DEG C/h, when preheated air and is dissipated
After the temperature 70 C of hot-air, 0.75h is kept the temperature, so that grinding roller is cooled to room temperature in the case where not providing heat source and wind regime, then
Roller surface is machined.
Embodiment 3
A kind of online build-up welding repair method of grinding roller, includes the following steps:
S1 clears up the oxide skin of roller surface, the dirt of attachment, while polishing the corner angle of roller surface, advantageously forms
Uniform welding bead；
S2, when reparation, the relative air humidity in environment is 90%, the preheated air pair for being 270~290 DEG C by temperature
Length is that the roll surface of 300~800mm is preheated, and it is empty to pass through the heat dissipation that temperature is 245~275 DEG C before the pad of grinding roller
Gas radiates to the roll surface that length after the pad of grinding roller is 300~1000mm；
S3, bead welding wire, the technique of the bead welding wire are joined by the way of multi-layer multi-pass welding on the roll surface polished
Numerical control is made as: welding current 460A, weldingvoltage 32V, speed of welding 80mm/min, and after being soldered together, then weldering is lower together,
Every layer of weld width is 7mm, and with a thickness of 4mm, the welding wire amount of lap of adjacent welding bead is 1/5, until the surface of entire grinding roller is welded
It is full；
S4 after the surface weldering of grinding roller is full, improves the temperature of preheated air to 500~510 DEG C, heat dissipation air themperature is 490
~505 DEG C, after keeping this state 1.5h, preheated air temperature is improved to 710~720 DEG C, heat dissipation air themperature is 700~715
DEG C, after keeping this state 1.5h, the temperature of preheated air and the air that radiates is reduced with the speed of 220 DEG C/h, when preheated air and
It radiates after the temperature 60 C of air, keeps the temperature 1h, grinding roller is made to be cooled to room temperature in the case where not providing heat source and wind regime, it is then right
Roller surface is machined.
It is operated using air conveying system as shown in Figure 1, the air conveying system includes hot-blast stove 1, hot wind
Pipeline 2 and recovery channel 3, one end of the hot air duct 2 are connected to the hot gas input port 12 of hot-blast stove 1, the hot air duct 2
The other end be connected to one end of recovery channel 3 by U-tube 4, the heat of the other end and hot-blast stove 1 of the recovery channel 3 is followed
Ring air inlet 13 is connected to, and offers the first heat exchanging passages, the side of the recovery channel 3 on the side wall of the hot air duct 2
It is offered on wall with the first heat exchanging passages relative to symmetrically arranged second heat exchanging passages of U-tube 4, first heat
It is equipped with steel wire floor 5 on the side wall of energy interchange channel and the second heat exchanging passages, the grinding roller is placed in first thermal energy
In interchange channel and the second heat exchanging passages, the steel wire floor 5 is abutted with grinding roller.
The setting of steel wire floor 5 effectively can avoid hot wind from dispelling in external environment, greatly reduce hot wind and atmosphere
Energy exchange, in grinding roller to be repaired rotation, steel wire floor 5 has certain deformability, while preventing air exchange not
The load of the motor that grinding roller offer power to be repaired is provided that can be excessive.
Cold air enters in hot-blast stove 1 from air inlet 11, becomes preheated air after heating, passes through hot air duct 2 and grinding roller
Carry out heat exchange, in the heat transfer to grinding roller in preheated air, the temperature of preheated air is reduced, when reaching recovery channel 3 with
Grinding roller carries out second of heat exchange, can absorb the heat that welding generates, effectively prevent welding bead because temperature is excessively high and grinding roller
Outer surface to be repaired connect the generation of not close phenomenon, welding bead can be made not easily to fall off, flawless also supplements the energy of welding bead
Amount, improves the insulation effect to grinding roller.
Claims (6)
1. a kind of online build-up welding repair method of grinding roller, which comprises the steps of:
S1 clears up the oxide skin of roller surface, the dirt of attachment, while polishing the corner angle of roller surface, advantageously forms uniformly
Welding bead；
S2 preheats the roll surface that length before the pad of grinding roller is 300~1600mm by preheated air, and by dissipating
Hot-air radiates to the roll surface that length after the pad of grinding roller is 300~2300mm；
S3, on the roll surface polished by the way of multi-layer multi-pass welding bead welding wire, after being soldered together, then weldering is lower together,
Until the surface of entire grinding roller is welded full；
S4 after the surface weldering of grinding roller is full, improves the temperature of preheated air to 480~550 DEG C, heat dissipation air themperature is 470~550
DEG C, after keeping 1~2h of this state, preheated air temperature is improved to 680~750 DEG C, and heat dissipation air themperature is 670~750 DEG C, is protected
After holding 1~2h of this state, the temperature of preheated air and the air that radiates is reduced with the speed of 180~220 DEG C/h, when preheated air and
It radiates after 50~70 DEG C of temperature of air, keeps the temperature 0.5~1h, so that grinding roller is cooled to room in the case where not providing heat source and wind regime
Then temperature is machined roller surface.
2. the online build-up welding repair method of grinding roller according to claim 1, it is characterised in that: the online built-up welding of the grinding roller
When restorative procedure works, the relative air humidity in environment is 20%~90%.
3. the online build-up welding repair method of grinding roller according to claim 1, it is characterised in that: in step S2, preheated air
Temperature be 200~350 DEG C, the temperature of the air that radiates is 160~340 DEG C.
4. the online build-up welding repair method of grinding roller according to claim 3, it is characterised in that: in step S3, the built-up welding
The process parameter control of welding wire are as follows: 460~500A of welding current, weldingvoltage are 28~32V, 80~130mm/ of speed of welding
min。
5. the online build-up welding repair method of grinding roller according to claim 1, it is characterised in that: in step S3, every layer of welding bead
Width is 6~8mm, with a thickness of 3~5mm.
6. the online build-up welding repair method of grinding roller according to claim 5, it is characterised in that: in step S3, adjacent welding bead
Welding wire amount of lap be 1/6~1/5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811338006.4A CN109202363A (en) | 2018-11-12 | 2018-11-12 | A kind of online build-up welding repair method of grinding roller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811338006.4A CN109202363A (en) | 2018-11-12 | 2018-11-12 | A kind of online build-up welding repair method of grinding roller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109202363A true CN109202363A (en) | 2019-01-15 |
Family
ID=64995238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811338006.4A Pending CN109202363A (en) | 2018-11-12 | 2018-11-12 | A kind of online build-up welding repair method of grinding roller |
Country Status (1)
| Country | Link |
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| CN (1) | CN109202363A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112077032A (en) * | 2020-09-09 | 2020-12-15 | 湖北金华建科技有限公司 | Auxiliary assembly is restoreed in online build-up welding |
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| US5398386A (en) * | 1993-05-27 | 1995-03-21 | Pyron; Donald | Process for rejuvenating baghouse filter cartridges |
| CN1334164A (en) * | 2000-07-17 | 2002-02-06 | 重庆钢铁(集团)有限责任公司 | Surface combination technology of straightening roll |
| CN102441760A (en) * | 2011-11-07 | 2012-05-09 | 山西鼎荣冷弯型钢有限公司 | Cold-bending roller welding repair method |
| CN202591773U (en) * | 2011-12-16 | 2012-12-12 | 西安中科麦特电子技术设备有限公司 | A reflow soldering machine realizing cyclic utilization of heat energy |
| CN107052701A (en) * | 2017-03-31 | 2017-08-18 | 安徽再制造工程设计中心有限公司 | A kind of roll overlaying technique |
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2018
- 2018-11-12 CN CN201811338006.4A patent/CN109202363A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5398386A (en) * | 1993-05-27 | 1995-03-21 | Pyron; Donald | Process for rejuvenating baghouse filter cartridges |
| CN1334164A (en) * | 2000-07-17 | 2002-02-06 | 重庆钢铁(集团)有限责任公司 | Surface combination technology of straightening roll |
| CN102441760A (en) * | 2011-11-07 | 2012-05-09 | 山西鼎荣冷弯型钢有限公司 | Cold-bending roller welding repair method |
| CN202591773U (en) * | 2011-12-16 | 2012-12-12 | 西安中科麦特电子技术设备有限公司 | A reflow soldering machine realizing cyclic utilization of heat energy |
| CN107052701A (en) * | 2017-03-31 | 2017-08-18 | 安徽再制造工程设计中心有限公司 | A kind of roll overlaying technique |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112077032A (en) * | 2020-09-09 | 2020-12-15 | 湖北金华建科技有限公司 | Auxiliary assembly is restoreed in online build-up welding |
| CN112077032B (en) * | 2020-09-09 | 2022-06-17 | 湖北金华建科技有限公司 | Auxiliary assembly is restoreed in online build-up welding |
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Application publication date: 20190115 |