CN117798595A - Method for repairing stainless steel welding wire in inner hole of hydraulic support cylinder - Google Patents
Method for repairing stainless steel welding wire in inner hole of hydraulic support cylinder Download PDFInfo
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- 238000003466 welding Methods 0.000 title claims abstract description 36
- 239000010935 stainless steel Substances 0.000 title claims abstract description 22
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- 238000005253 cladding Methods 0.000 claims abstract description 139
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 9
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention relates to the field of hydraulic cylinders, and particularly discloses a method for repairing stainless steel welding wires in an inner hole of a hydraulic support cylinder; the invention processes the waste oil cylinder through the oil cylinder inner hole cladding process, can lead the performance index of the processing oil cylinder to reach or exceed the standard of new products, has the advantages of high bonding strength, fine and uniform structure, high hardness, wear resistance, corrosion resistance, high temperature resistance, oxidation resistance and the like, can greatly prolong the service life of the upright post jack and a sealing member thereof, is an environment-friendly, efficient, energy-saving and stable cladding forming method, provides a powerful technical support for the manufacture and maintenance of a high-end coal machine and the safe production connection of a mine, replaces the lagging productivity of electroplating and the like, meets the requirement of new and old kinetic energy conversion, can relieve the cost and environmental problems caused by a large number of scrapped products, and simultaneously meets the overall requirements of national promotion of the development of remanufacturing industry and the development of recycling economy, and has good social benefits.
Description
Technical Field
The invention belongs to the technical field of hydraulic cylinders, and particularly relates to a method for repairing stainless steel welding wires in an inner hole of a hydraulic support cylinder.
Background
Due to the comprehensive influence of severe working conditions and corrosive medium environments of a coal mine, when the oil cylinder works underground for a certain time and is maintained in a lifting way, the phenomena of rust, rust pits and abrasion of the inner holes of most cylinder barrels with different degrees can be found, so that the oil cylinder is scrapped or needs to be overhauled. Taking ZF12000 frame as an example, the number of rusted and severely worn inner holes of the outer cylinder of the upright post accounts for about 75 percent. In the maintenance process, the inner hole of the cylinder barrel is treated in a polishing or honing mode, so that the surface rust is only acted, and the rust pit or scratch phenomenon cannot be repaired. If boring or honing is used to remove rust pits and scratches to be defect-free, the processing and removal are usually required to be carried out by 0.5mm to 2mm. Therefore, the problems of short service life, high maintenance cost, long maintenance period and the like are brought. Such problems cannot be fundamentally solved by the conventional repair method of electroplating.
In the prior art, the problems of rust pit or abrasion caused by copper plating or low-temperature iron plating process treatment are solved, and the corrosion and abrasion are caused by the fact that the plating layer is not easy to fall off due to the insufficient bonding strength, and in addition, the inner hole is easy to be corroded due to the fact that the porosity of the plating layer is large, so that the repairing quality of the oil cylinder is not effectively ensured, the service life is short after repairing, and loss and potential safety hazards are caused to underground production. At present, the service life of the middle cylinder and the outer circle of the movable column of more upright columns is long by adopting a laser cladding technology, and the same service life of the inner circle and the outer circle cannot be achieved by an electroplating process. And simultaneously, a large number of outer cylinders and middle cylinders are scrapped due to serious corrosion and difficult repair each year, so that resource waste and cost increase are caused.
The cylinder inner hole cladding process is a remanufacturing technology for repairing the cylinder inner hole with serious rust and abrasion. The performance of the alloy reaches the standard of a new product through restoration, and the corrosion resistance and the wear resistance of the alloy exceed the standard of the new product. Meanwhile, the technique of laser cladding the excircle is complemented, so that all parts of the oil cylinder reach the same life cycle.
Disclosure of Invention
The invention aims to provide a method for repairing stainless steel welding wires in an inner hole of a hydraulic support cylinder, so as to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a method for repairing stainless steel welding wires in an inner hole of a hydraulic support cylinder specifically comprises the following steps:
s1, positioning holes, namely loading a cylinder barrel to be repaired into centering hole equipment, and drilling a center hole 1 at the bottom end of an outer cylinder barrel;
s2, rough turning, namely clamping a cylinder opening and a frame position by adopting a method of 'top two ends' through a determined center hole, and turning the cylinder opening to remove a single side of 1mm;
s3, boring a blind hole: the end head of blind hole boring equipment is used for grabbing a center hole, a center frame is used for clamping and aligning, an inner hole is bored on the inner wall of the cylinder barrel, and the single side of the inner wall of the cylinder barrel is removed by 1mm;
s4, inner hole cladding: the end head of the inner hole cladding equipment is used for grabbing a center hole, a center frame is used for clamping and aligning, stainless steel welding wires are used for cladding the cylinder barrel and the cylinder opening, a 316L fuse wire is used as a fuse wire material, and the cladding amount is 2mm on a single side;
s5, finish turning: through the determined center hole, the center hole is gripped by three claws at the end, and the center frame is used for clamping and aligning, so that the cylinder opening is turned to the drawing size;
s6, boring a blind hole: the end head of blind hole boring equipment is used for grabbing a center hole, a center frame is used for clamping and aligning, and the inner wall of the cylinder barrel is bored to the drawing size;
s7, honing: the end head of the honing equipment is used for grabbing a center hole, a center frame is used for clamping and aligning, and honing treatment is carried out on the inner wall of the cylinder barrel and the cylinder opening until the roughness is required by the drawing;
s8, checking: and (5) checking the repaired cylinder barrel according to the drawing.
Preferably, in the step S4, main parameters of the internal control cladding process include current, voltage, dry elongation, cladding speed, overlap amount, fuse material and shielding gas ratio.
Preferably, the welding current and the welding voltage need to be regulated according to the conditions of small welding splashing and no penetration.
Preferably, the fuse dry extension length needs to be adjusted to different fuse dry extension lengths, a cladding test is carried out, the cladding process and the appearance quality of the surface layer after cladding are observed, and the performance of the cladding layer after processing is detected to obtain the optimal fuse dry extension length parameter.
Preferably, the cladding speed is inversely proportional to the cladding amount of fuse metal on the cladding layer in unit length, the melting width is inversely proportional to the opening of the cladding speed, different cladding linear speeds can be adjusted, cladding tests can be carried out, quality is observed, and the performance is detected, so that cladding speed parameters for workpieces with different diameters are obtained.
Preferably, the overlapping amount determines the distance between the centers of the two adjacent cladding layers and the height of cladding forming, and the evenness is improved by adjusting the overlapping amount of the two adjacent cladding layers.
Preferably, the fuse diameter is determined based on the cladding current, voltage and cladding speed.
Preferably, the ratio of the protective gas is 95% Ar+5% CO 2 。
Compared with the prior art, the invention has the beneficial effects that:
the invention processes the waste oil cylinder through the oil cylinder inner hole cladding process, can lead the performance index of the processing oil cylinder to reach or exceed the standard of new products, has the advantages of high bonding strength, fine and uniform structure, high hardness, wear resistance, corrosion resistance, high temperature resistance, oxidation resistance and the like, can greatly prolong the service life of the upright post jack and a sealing member thereof, is an environment-friendly, efficient, energy-saving and stable cladding forming method, provides a powerful technical support for the manufacture and maintenance of a high-end coal machine and the safe production connection of a mine, replaces the lagging productivity of electroplating and the like, meets the requirement of new and old kinetic energy conversion, can relieve the cost and environmental problems caused by a large number of scrapped products, and simultaneously meets the overall requirements of national promotion of the development of remanufacturing industry and the development of recycling economy, and has good social benefits.
Drawings
FIG. 1 is a block diagram of a method of the present invention;
FIG. 2 is a map of the cladding overlap of the present invention;
FIG. 3 is a graph of wire feed speed versus current and fuse diameter for a fuse of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples:
referring to fig. 1-3, a method for repairing stainless steel welding wires in an inner hole of a hydraulic support cylinder specifically comprises the following steps:
s1, positioning holes, namely loading a cylinder barrel to be repaired into centering hole equipment, and drilling a center hole 1 at the bottom end of an outer cylinder barrel;
s2, rough turning, namely clamping a cylinder opening and a frame position by adopting a method of 'top two ends' through a determined center hole, and turning the cylinder opening to remove a single side of 1mm;
s3, boring a blind hole: the end head of blind hole boring equipment is used for grabbing a center hole, a center frame is used for clamping and aligning, an inner hole is bored on the inner wall of the cylinder barrel, and the single side of the inner wall of the cylinder barrel is removed by 1mm;
s4, inner hole cladding: the end head of the inner hole cladding equipment is used for grabbing a center hole, a center frame is used for clamping and aligning, stainless steel welding wires are used for cladding the cylinder barrel and the cylinder opening, and the cladding amount is 2mm on one side;
s5, finish turning: through the determined center hole, the center hole is gripped by three claws at the end, and the center frame is used for clamping and aligning, so that the cylinder opening is turned to the drawing size;
s6, boring a blind hole: the end head of blind hole boring equipment is used for grabbing a center hole, a center frame is used for clamping and aligning, and the inner wall of the cylinder barrel is bored to the drawing size;
s7, honing: the end head of the honing equipment is used for grabbing a center hole, a center frame is used for clamping and aligning, and honing treatment is carried out on the inner wall of the cylinder barrel and the cylinder opening until the roughness is required by the drawing;
s8, checking: and (5) checking the repaired cylinder barrel according to the drawing.
And S4, inner hole cladding equipment adopts an inner hole cladding machine, and consists of a machine body, a spindle box, a clamp, a conductive mechanism, a welding gun clamping and adjusting mechanism, a cross mechanism, an electric control system, a cladding power supply and a pneumatic system. The automatic cladding of the inner hole can be completed. The molding uniformity, the appearance and the penetration and the width reach the technological requirements, and the clamping is convenient. And (3) adopting an M IG cladding process, and finishing welding seam cladding of the inner wall of the pipe by welding gun cladding. The equipment is mainly characterized in that:
(1) the welding gun is used for cladding in a front-back displacement mode along the axis, the workpiece rotates, and the cladding position is horizontal.
(2) The workpiece is driven to rotate by a power head, the end face is positioned, and the workpiece is clad in a rotating way.
(3) The special machine has the functions of high voltage, slow wire feeding and arc striking, reliable arc striking, low voltage, small current arc striking and arc pit filling.
(4) And a push wire type wire feeding mode is adopted, so that the wire feeding stability is ensured.
(5) The welding gun is longitudinally adjustable, and is suitable for cladding of various varieties.
(6) The whole machine is controlled to operate by a PLC machine, the workpiece is rotated by alternating current variable frequency speed regulation, stepless regulation is realized, and the reliability of the equipment is improved.
(7) The cladding form, the cladding specification can be preset, stored and called. Parameters and state transitions can be conveniently altered through a touch-type human-machine interface.
(8) The welding gun can be adjusted up and down, left and right and angles so as to adapt to the cladding requirement.
And S3, the blind hole boring equipment adopts a numerical control blind hole boring machine, and the machine tool comprises main components such as a lathe bed, a headstock, a four-jaw single-action chuck, a center frame, a feeding system, a cooling system, an electric control system and the like. Parts such as a machine tool body, a headstock, a carriage and the like are molded by high-strength cast iron and resin sand, and the requirements on good rigidity, high strength and stable precision are met.
In the step S4, main parameters of the internal control cladding process include current, voltage, dry elongation, cladding speed, overlap, fuse material and shielding gas ratio, and these process parameters determine the cladding speed and the indexes of hardness, wear resistance, corrosion resistance and the like of the cladding layer, so the rationality of the process parameter configuration is important in the whole project.
The comparison of the fuse-coating test results and the data of the same type of fuse wire shows that: after the arc voltage is increased, the arc power is increased, the heat input of the workpiece is increased, meanwhile, the arc length is prolonged, the distribution radius is increased, and therefore the penetration is slightly reduced and the melting width is increased. The residual height is reduced because the melting width is increased and the amount of fuse melting is slightly reduced. When the cladding current is increased (other conditions are unchanged), the penetration and residual height of the welding line are increased, and the melting width is not changed (or slightly increased). This is because after the current increases, both the arc force and the heat input on the workpiece increase, the heat source position moves downward, and the penetration increases. The penetration is nearly in direct proportion to the current; after the current is increased, the melting quantity of the fuse wire is increased in a nearly proportional way, and the residual height is increased because the melting width is nearly unchanged; after the current is increased, the diameter of the arc column is increased, but the depth of the arc submerging into the workpiece is increased, and the moving range of the arc spot is limited, so that the melting width is nearly unchanged.
The magnitude of the cladding current has a great influence on cladding quality and cladding production efficiency. Cladding current mainly affects the magnitude of penetration. The current is small, the electric arc is unstable, the penetration is small, the defects of incomplete penetration, slag inclusion and the like are easily caused, and the productivity is low; and when the current is too large, defects such as undercut and burn-through are easily generated in the welding line, and meanwhile splashing is caused. Therefore, the cladding current must be selected to be appropriate.
From the above, it can be seen that: the current affects the cladding depth and thickness, and the voltage affects the single pass cladding width. The technological research is based on the theoretical and experimental results, and the current and voltage are continuously regulated, so that the effects of small cladding splashing and no penetration depth are achieved. Meanwhile, stable and reliable current and voltage parameters are obtained to meet the requirements of cladding depth, thickness and width.
The fuse dry extension length needs to be adjusted to different fuse dry extension lengths, a cladding test is carried out, the cladding process and the appearance quality of the surface layer after cladding are observed, and the performance of the cladding layer after processing is detected to obtain the optimal fuse dry extension length parameter.
The speed of cladding is directly related to the production efficiency of cladding. In order to obtain the maximum cladding speed, the larger fuse diameter and cladding current are adopted on the premise of ensuring the quality, and meanwhile, the cladding speed is properly adjusted according to the specific situation, so that the flatness of the cladding layer is ensured as much as possible. The test finds that: when the cladding speed is increased, the energy is reduced, and the penetration and the melting width are both reduced. The excess height is also reduced because the amount of fuse metal cladding per unit length of cladding layer is inversely proportional to the cladding rate, and the width of the fuse is inversely proportional to the evolution of the cladding rate.
And (3) adjusting different cladding linear speeds, carrying out cladding tests, observing quality and detecting performance, and obtaining cladding speed parameters for workpieces with different diameters.
In the cladding forming process, the lap joint amount is a very important factor affecting the cladding quality, and not only determines the distance between centers of two adjacent cladding layers and the height of cladding forming, but also determines the flatness of the cladding layers to a great extent, thereby affecting the completion and quality of the forming process. Therefore, the lap joint amount is researched, and the reliability of the lap joint amount and the performance of the cladding layer are verified and analyzed through experiments, so that the method has great significance on the molding quality of the cladding layer.
The cladding layer forming refers to the process of forming track overlapping in a forming platform, and a plurality of forming tracks are overlapped in sequence, so that adjacent forming tracks should be overlapped according to a certain interval in order to ensure the forming quality and the surface flatness.
When the distance between two adjacent molding tracks is long in the molding process, the flatness of the molding surface is reduced, and the quality of the next cladding molding is affected, as shown in a graph in fig. 2. When the distance between two adjacent forming tracks is relatively short, the forming surface is raised, and the quality of the next cladding forming is affected, as shown in a graph c in fig. 2, the height of the cladding layer is increased layer by layer. In fig. 2, the graph b shows the overlap in an ideal state, and after the overlap of two adjacent molding tracks is completed, the molding surface is a plane.
In the actual cladding operation, the influence of the surface tension of the metal in the molten state on the shrinkage to be a curved surface is difficult to reach an ideal state, so that the difference value needs to be reduced by calculating the difference value between the wave crest and the wave trough of each cladding track, and the smaller the difference value is, the better the flatness is.
And when the test verifies, the evenness is improved by adjusting the overlap joint quantity of two adjacent cladding layers, and stable and reliable overlap joint quantity parameters are obtained by combining the cladding speed and the salt spray test result.
The inner hole cladding layer of the oil cylinder to be researched in the project must have the characteristics of high bonding strength, fine and uniform structure, high hardness, wear resistance, corrosion resistance, high temperature resistance, oxidation resistance and the like, and is influenced by the severe working condition of the coal mine and the comprehensive influence of the corrosive medium environment, so that fuse wire materials with excellent performance are selected to be the key for finishing the performance index of the cladding layer, and copper-based fuses are commonly adopted for inner hole cladding in the related industries in China at present. The project mainly selects fuses with different materials and performances such as copper-based fuses, stainless steel fuses and the like for carrying out cladding tests.
In the early stage of research, a great deal of experiments were carried out mainly with aluminum bronze fuses. The reinforced and repaired inner wall of the outer cylinder ensures the strength of the matrix, and simultaneously greatly improves the bonding strength, wear resistance and corrosion resistance, the hardness HB of the cladding layer is about 200-240, and the neutral salt spray test achieves 120 hours of no rust.
In the middle-stage test, the verification is mainly performed on the stainless steel solid fuse. The fuse wire can be used for inert gas shielded welding (T IG, M IG welding) and submerged arc welding. The stainless steel MIG welding can achieve high-efficiency cladding, is easy to realize cladding automation, and has wide application fields. The types of fuses are numerous, including ER304, ER308L, ER LS i, ER309L, ER LSi, ER316L, ER321, 307Si, and the like. Through comprehensive analysis on the requirements of corrosion resistance and wear resistance, two fuses 304 and 316L are selected in the test, and the test verification shows that: the 316L fuses perform significantly better than copper-based fuses and 304 fuses. The 316L fuse belongs to a low-carbon stainless steel fuse, has good cladding manufacturability, is added with Mo element, and has excellent intergranular corrosion resistance. The hardness HB240-280 of the cladding layer can reach 720 hours without rust corrosion in the neutral salt spray test.
And finally, selecting the 316L fuse as an inner hole cladding fuse through verification data analysis of the fuses made of the three materials.
Referring to fig. 3, the current adjustment is actually at the adjustment of the wire feed speed. Therefore, the cladding current must be matched with the cladding voltage, and the wire feeding speed must be consistent with the melting capacity of the cladding voltage on the fuse so as to ensure the stability of the arc length. Relationship between cladding current and wire feed speed: the greater the current, the faster the wire feed speed of the same fuse. The same current, the finer the fuse wire feed speed is. The corresponding fuse diameter is selected according to the cladding conditions (parameters such as current, voltage, cladding speed, etc.).
In the process of process verification, 100% CO is respectively used for 2 、100％Ar、95％Ar+5％CO 2 The proportions of the three gases are verified. The gas proportion has influence on cladding through verification:
under the same technological parameters, 95 percent Ar+5 percent CO is adopted 2 The gas protection has better control on splashing during cladding, the control effect is inferior when 100% Ar gas is protected, and 100% CO 2 The effect is the worst.
Under the same technological parameters, 95 percent Ar+5 percent CO is adopted 2 Gas-shielded cladding layer flatness ratio.
The other two gases are mixed and reduced by about 0.2-0.5 mm, so that the cladding thickness can be effectively reduced, the fuse consumption can be reduced, and the process window of other parameters can be enlarged.
With 95% Ar+5% CO 2 The gas shield can well control the splashing, so even if the cladding current is increased during cladding, the splashing can still be kept well controlled. This brings about an advantage that the cladding speed is increased and the production efficiency can be improved.
In the cladding, 95% Ar+5% CO is adopted 2 The gas protection can obviously reduce cladding smoke dust, and when the gas protection is matched with a smoke dust purifier for use, the field operation environment is greatly improved.
From the above, it can be seen that 95% Ar+5% CO 2 The ratio of the protective gas is a better choice, and the ratio of the protective gas is 95 percent Ar+5 percent CO 2 。
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The method for repairing the stainless steel welding wire in the inner hole of the hydraulic support cylinder is characterized by comprising the following steps of:
s1, positioning holes, namely loading a cylinder barrel to be repaired into centering hole equipment, and drilling a center hole 1 at the bottom end of an outer cylinder barrel;
s2, rough turning, namely clamping a cylinder opening and a frame position by adopting a method of 'top two ends' through a determined center hole, and turning the cylinder opening to remove a single side of 1mm;
s3, boring a blind hole: the end head of blind hole boring equipment is used for grabbing a center hole, a center frame is used for clamping and aligning, an inner hole is bored on the inner wall of the cylinder barrel, and the single side of the inner wall of the cylinder barrel is removed by 1mm;
s4, inner hole cladding: the end head of the inner hole cladding equipment is used for grabbing a center hole, a center frame is used for clamping and aligning, stainless steel welding wires are used for cladding the cylinder barrel and the cylinder opening, a 316L fuse wire is used as a fuse wire material, and the cladding amount is 2mm on a single side;
s5, finish turning: through the determined center hole, the center hole is gripped by three claws at the end, and the center frame is used for clamping and aligning, so that the cylinder opening is turned to the drawing size;
s6, boring a blind hole: the end head of blind hole boring equipment is used for grabbing a center hole, a center frame is used for clamping and aligning, and the inner wall of the cylinder barrel is bored to the drawing size;
s7, honing: the end head of the honing equipment is used for grabbing a center hole, a center frame is used for clamping and aligning, and honing treatment is carried out on the inner wall of the cylinder barrel and the cylinder opening until the roughness is required by the drawing;
s8, checking: and (5) checking the repaired cylinder barrel according to the drawing.
2. The method for repairing the stainless steel welding wire in the inner hole of the hydraulic support cylinder, according to claim 1, is characterized in that: in the step S4, main parameters of the internal control cladding process comprise current, voltage, dry elongation, cladding speed, overlap amount, fuse material and shielding gas proportion.
3. The method for repairing the stainless steel welding wire in the inner hole of the hydraulic support cylinder, according to claim 2, is characterized in that: the welding current and the welding voltage are required to be regulated according to the standard that the welding splashing is small and the penetration is not deep.
4. The method for repairing the stainless steel welding wire in the inner hole of the hydraulic support cylinder according to claim 3, wherein the method comprises the following steps: the fuse dry extension length needs to be adjusted to different fuse dry extension lengths, a cladding test is carried out, the cladding process and the appearance quality of the surface layer after cladding are observed, and the performance of the cladding layer after processing is detected to obtain the optimal fuse dry extension length parameter.
5. The method for repairing the stainless steel welding wire in the inner hole of the hydraulic support cylinder, as set forth in claim 4, is characterized in that: the cladding speed is inversely proportional to the cladding amount of fuse metal on a cladding layer in unit length, the melting width is inversely proportional to the opening of the cladding speed, different cladding linear speeds can be adjusted, cladding tests can be carried out, quality is observed, and the performance is detected, so that cladding speed parameters for workpieces with different diameters are obtained.
6. The method for repairing the stainless steel welding wire in the inner hole of the hydraulic support cylinder, as set forth in claim 5, is characterized in that: the lap joint amount determines the distance between the centers of the two adjacent cladding layers and the height of cladding forming, and the flatness is improved by adjusting the lap joint amount of the two adjacent cladding layers.
7. The method for repairing the stainless steel welding wire in the inner hole of the hydraulic support cylinder, as set forth in claim 6, is characterized in that: the fuse diameter is determined based on the cladding current, voltage, and cladding speed.
8. The hydraulic bracket cylinder inner hole stainless steel welding wire repair device according to claim 2The complex method is characterized in that: the ratio of the protective gas is 95 percent Ar+5 percent CO 2 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311856196.XA CN117798595A (en) | 2023-12-29 | 2023-12-29 | Method for repairing stainless steel welding wire in inner hole of hydraulic support cylinder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311856196.XA CN117798595A (en) | 2023-12-29 | 2023-12-29 | Method for repairing stainless steel welding wire in inner hole of hydraulic support cylinder |
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| CN202311856196.XA Pending CN117798595A (en) | 2023-12-29 | 2023-12-29 | Method for repairing stainless steel welding wire in inner hole of hydraulic support cylinder |
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| CN (1) | CN117798595A (en) |
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