CN114603236A - Simple welding device and method for cracking of large high-voltage motor base lug - Google Patents
Simple welding device and method for cracking of large high-voltage motor base lug Download PDFInfo
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- CN114603236A CN114603236A CN202210418433.3A CN202210418433A CN114603236A CN 114603236 A CN114603236 A CN 114603236A CN 202210418433 A CN202210418433 A CN 202210418433A CN 114603236 A CN114603236 A CN 114603236A
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- 238000003466 welding Methods 0.000 title claims abstract description 207
- 238000005336 cracking Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000003825 pressing Methods 0.000 claims abstract description 56
- 229910001141 Ductile iron Inorganic materials 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 25
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 22
- 239000010410 layer Substances 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 12
- 229910052786 argon Inorganic materials 0.000 claims description 11
- 230000007547 defect Effects 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 229910002804 graphite Inorganic materials 0.000 claims description 7
- 239000010439 graphite Substances 0.000 claims description 7
- 229920000742 Cotton Polymers 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 238000007778 shielded metal arc welding Methods 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 6
- 238000010891 electric arc Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 230000007774 longterm Effects 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000004519 grease Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 239000011229 interlayer Substances 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- QFXZANXYUCUTQH-UHFFFAOYSA-N ethynol Chemical group OC#C QFXZANXYUCUTQH-UHFFFAOYSA-N 0.000 claims description 2
- 230000008030 elimination Effects 0.000 claims 1
- 238000003379 elimination reaction Methods 0.000 claims 1
- 230000008439 repair process Effects 0.000 abstract description 10
- 238000012423 maintenance Methods 0.000 abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 4
- 238000005266 casting Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 abstract description 2
- 229910052742 iron Inorganic materials 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 5
- 229910001060 Gray iron Inorganic materials 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- LNSPFAOULBTYBI-UHFFFAOYSA-N [O].C#C Chemical group [O].C#C LNSPFAOULBTYBI-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
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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
- B23K9/0026—Arc welding or cutting specially adapted for particular articles or work
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Abstract
The invention discloses a simple welding device for cracking of a base lug seat of a large-sized high-voltage motor, which comprises a U-shaped structural part tool, wherein the structural part tool comprises two side plates which are arranged in parallel and a rear baffle which is fixedly connected to the same side end parts of the two side plates, two pairs of bulges are correspondingly arranged on two sides of the top parts of the two side plates respectively, a front pressing plate and a rear pressing plate are detachably arranged on the tops of the two pairs of corresponding bulges respectively, a plurality of front ejector rods and rear ejector rods penetrate through the front pressing plate and the rear pressing plate respectively, a front end pressing plate is detachably arranged on the other side end part of the two side plates, and a plurality of front end ejector rods penetrate through the front end pressing plate. The simple welding device for cracking of the large-sized high-voltage motor bottom lug is novel in design, simple and reasonable in structure and easy to operate, effectively meets the welding requirement of the nodular cast iron bottom lug by matching with the welding method, is short in repair time and low in maintenance cost, and provides scientific reference basis for the welding repair of other large-sized iron castings.
Description
Technical Field
The invention belongs to the technical field of welding, and relates to a simple welding device and a simple welding method for cracking of a bottom lug seat of a large high-voltage motor.
Background
The large high-voltage motor is a core device commonly used in a high-voltage pump room, for example, Baokouma steel rail transit material science and technology limited company is an important train wheel production base in China, is the biggest wheel production enterprise in Asia, is the only enterprise capable of producing passenger train wheels with speed grade of more than 120Km/h in China, and research and development of heavy-duty wheels reach the international advanced level. Because the long-term operation of high pressure water pump supplies water, the large-scale motor of 520KW removes daily point and examines and repair the maintenance, can regularly carry out the off-line maintenance of dispatching from the factory every year, like the schematic diagram of the large-scale high pressure motor that fig. 1 shows, this large-scale motor of 520KW is at the handling in-process, often can appear falling to the ground not steady and in the time of the 2 repeated installations of base ear seat for a plurality of times unsmooth fastening, directly lead to the fracture of 2 faces of base ear seat, the supporting high pressure water pump operation of the large-scale motor of unable monolithic stationary 520 KW. In the above situation, if the 520KW large motor is replaced entirely only due to the crack of the bottom lug seat, a large amount of cost is wasted, and if the local replacement time period of the manufacturer is long, the welding repair needs to be performed on site. Because the material of the large-scale motor body of 520KW is nodular cast iron, the main problem of this kind of material welding is: (1) the chilling tendency and the hardening tendency of the nodular cast iron during welding are greater than those of the grey cast iron; (2) the strength, the plasticity and the toughness of the nodular cast iron are higher than those of grey cast iron, and the welding difficulty is higher; (3) the split part of the 520KW large-scale high-voltage motor base is ensured to be welded at the horizontal position as required, the original installation size is recovered after single-side welding, and the repair requirement of the base is difficult to ensure through direct welding repair.
Disclosure of Invention
Aiming at the difficulty in welding and repairing the cracked part of the large-sized motor bottom lug base in the background technology, the invention provides a simple welding device and a simple welding method for the cracked part of the large-sized high-voltage motor bottom lug base.
The technical scheme for solving the technical problem of the invention is as follows:
the invention relates to a simple welding device for cracking of a large-scale high-voltage motor base lug seat, which comprises a U-shaped structural part tool, wherein the structural part tool comprises two side plates which are arranged in parallel and a rear baffle plate which is fixedly connected to the same side end parts of the two side plates, two pairs of bulges are correspondingly arranged on two sides of the top parts of the two side plates respectively, a front pressing plate and a rear pressing plate are detachably arranged on the tops of the two pairs of corresponding bulges respectively, a plurality of front ejector rods and rear ejector rods are respectively arranged on the front pressing plate and the rear pressing plate in a penetrating manner, a front end pressing plate is detachably arranged on the other side end parts of the two side plates, and a plurality of front end ejector rods are arranged on the front end pressing plate in a penetrating manner.
Furthermore, the two ends of the front pressing plate and the rear pressing plate are detachably connected and fixed with the corresponding bulges on the side plates through the front connecting screw rod and the rear connecting screw rod respectively.
Furthermore, two ends of the front end pressing plate are detachably connected and fixed with the end parts of the two side plates through front end screws respectively.
Further, the side plates and the rear baffle are fixed in a welding mode.
Further, the structural part tool, the front pressing plate, the rear pressing plate and the front end pressing plate are respectively manufactured by steel plates with the thickness of 50 mm; the front connecting screw rod, the front ejector rod, the rear connecting screw rod, the rear ejector rod, the front end connecting screw rod and the front end ejector rod are all manufactured through round rods with the diameter of 40mm respectively.
The invention relates to a method for welding the bottom lug base of a large high-voltage motor to crack, which is carried out by using the simple welding device for the bottom lug base of the large high-voltage motor to crack, and the method comprises the following steps:
step one, preparing before welding;
1.1), welding equipment: digitally controlling inverse manual shielded metal arc welding and argon arc welding and using a direct current welding machine, wherein a Z258 welding rod is adopted as a welding material;
1.2), heating device: h01-20 heat gun;
1.3), auxiliary facilities: angle grinder, file, hammer, flat shovel, mask, sample plate, thermodetector, magnifier, and heat insulation cotton;
1.4), weldment materials: the body is made of nodular cast iron;
1.5) and the requirements of surfacing before welding are as follows: removing rust, grease and moisture by machining and cleaning the worn surface;
1.6), welding position: welding a V-shaped groove on one side of the whole welding line;
1.7), welding requirements: all welding layers must be free of any welding defects and fused to the base material;
1.8), welding process parameters: setting welding parameters according to welding equipment, welding materials, weldment materials and welding requirements;
step two, welding implementation;
2.1) cutting a single-sided V-shaped groove at the cracking position of the bottom lug seat by a manual angle grinder along the cracking position, then a structural part tool is arranged on the base lug seat, the horizontal planes at two sides of the V-shaped groove of the base lug seat are respectively jacked through the front top rod and the rear top rod, the front end part of the base lug seat is jacked through the top rod at the front end part, then heating to 500-600 ℃ at the two sides of the V-shaped groove by an oxygen-acetylene flame baking gun at the position of 20-30mm, and a temperature measuring gun is adopted for temperature verification, after the temperature is reached, digital control inverse manual shielded metal arc welding and argon arc welding are used, a direct current welding machine is used, a Z258 welding rod with the diameter of 3.2mm is adopted for bottom layer welding, the welding rod conveying method is linear, the root bottom is melted through, 8-12mm medium arc length continuous welding is adopted, the welding core and the coating are acted together to spheroidize the graphite of the welding seam, and no welding defects such as cracks and the like are confirmed after the welding is finished;
2.2) when the filling layer and the cover surface layer are welded, controlling the interlayer temperature to be kept at 500-600 ℃, also adopting digital control inverse manual welding rod electric arc welding and argon arc welding, using a Z258 welding rod with phi 4.0mm to weld by using a direct current welding machine, wherein the horizontal included angle of the welding rod is 80-90 degrees, the strip conveying method is in a small crescent shape, adopting an arc length with the length of 12-18mm to continuously weld, being beneficial to melting of a coating and transition of graphite into a molten pool, completely covering the head and the tail, immediately adopting hammering to enable the surface of a welding line to be fully covered with pits after welding each layer is finished, and eliminating welding stress; the surfacing layer is higher than the base material when covering the surface, so that the surfacing layer is convenient for manual grinding and smooth transition with the base material;
2.3) after all the cracks are welded, heating the whole welding line by using an H01-20 heating gun for 500-700 ℃ stress relief normalizing treatment, gradually cooling to 250 ℃, integrally covering by using heat preservation cotton, cooling to room temperature, then disassembling the simple welding device for cracking the large-scale high-voltage motor base lug, confirming that the welding line has no any defect by detecting and detecting flaws, precisely grinding the welding line of the processed base lug by using a manual angle grinder, comparing by using a sample plate which is manufactured in advance, and recovering the use tolerance size.
Further, the welding equipment is a welding machine combining digital controlled inverse manual shielded metal arc welding and argon arc welding with models of HT400D or HT 500D.
Further, when the bottom layer is welded, a Z258 welding rod with the diameter of phi 3.2mm is adopted, the welding current is 110-140A, the arc voltage is 25 +/-1V, and the welding speed is 17 +/-1 cm/min; when the overlaying layer is welded, a Z258 welding rod with phi of 4.0mm is adopted, the welding current is 160-200A, the arc voltage is 28 +/-1V, and the welding speed is 19 +/-1 cm/min.
Compared with the prior art, the simple welding device for cracking of the large-scale high-voltage motor base ear seat has the advantages of novel design, simple and reasonable structure, convenience in material taking and manufacturing and simplicity in operation, and can effectively ensure that the cracking part of the large-scale motor base ear seat is in a single-side horizontal welding position and effectively prevent welding deformation through the arrangement of the structural part tool and each pressing plate; the simple welding device for cracking of the large high-voltage motor bottom lug base is matched with the welding method, effectively meets the welding requirement of the nodular cast iron bottom lug base, is short in repair time and low in maintenance cost, and also provides a scientific reference basis for welding repair of other large iron castings.
Drawings
Fig. 1 is a schematic structural view of a large-sized high-voltage motor according to the present invention;
FIG. 2 is a schematic structural diagram of the simplified apparatus of the present invention;
FIG. 3 is an exploded view of the simplified apparatus of the present invention;
FIG. 4 is a schematic view of a tooling for a structural member according to the present invention;
in the figure: 1. a large high voltage motor; 2. a base ear mount; 2.1, cracking; 2.2, V-shaped beveling; 3. a structural part tool; 3.1, side plates; 3.2, a rear baffle; 3.3, a bulge; 4. a rear pressing plate; 5. the rear connecting screw rod; 6. a rear ejector rod; 7. a front platen; 8. a front connecting screw rod; 9. a front compression bar; 10. a front end pressing plate; 11. the front end part is connected with a screw rod; 12. a front end ejector rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "lateral", "longitudinal", and the like used in the specification and claims of the present disclosure are used only to indicate relative positional relationships, and when the absolute position of an object to be described is changed, the relative positional relationships are also changed accordingly.
Example 1:
as shown in fig. 1-4, the four corners of the bottom of the large high-voltage motor 1 are respectively provided with a base lug 2, after long-term use and maintenance, the base lug 2 is easy to crack and the normal operation of the large high-voltage motor 1 is affected; in order to fix the crack of the bottom lug seat 2 during welding repair 2.1, prevent welding deformation and ensure that the crack 2.1 is positioned at a horizontal welding position, the invention discloses a simple welding device for the crack of the bottom lug seat of a large-scale high-voltage motor, which comprises a U-shaped structural part tool 3, wherein the structural part tool 3 comprises two side plates 3.1 which are arranged in parallel and a rear baffle 3.2 which is welded at the same side end part of the two side plates 3.1, the top part of the rear baffle 3.2 is higher than the height of the two side plates 3.1, two pairs of bulges 3.3 are correspondingly arranged at two sides of the top part of the two side plates 3.1 respectively, a front pressing plate 7 and a rear pressing plate 4 are detachably arranged at the tops of the two pairs of corresponding bulges 3.3, a plurality of front ejector rods 9 and a plurality of rear ejector rods 6 are respectively arranged on the front pressing plate 7 and the rear pressing plate 4 in a penetrating manner, a front end pressing plate 10 is detachably arranged at the other side end part of the two side plates 3.1, and a plurality of front end ejector rods 12 are arranged on the front end pressing plate 10 in a penetrating manner. Preferably, two ends of the front pressing plate 7 and the rear pressing plate 4 are detachably connected and fixed with the corresponding bulges 3.1 on the side plate 3.1 through the front connecting screw rod 8 and the rear connecting screw rod 5 respectively; the two ends of the front end pressing plate 10 are detachably connected and fixed with the end parts of the two side plates 3.1 through front end screw rods 11 respectively.
During manufacturing, the structural part tool 3, the front pressing plate 7, the rear pressing plate 4 and the front end pressing plate 10 are respectively machined and manufactured through steel plates with the thickness of 50mm, the manufacturing size of the structural part tool 3 is matched and manufactured according to the size specification of the base lug seat 2, then threaded holes are respectively formed in the top of a bulge 3.1 and the front end of the bulge for being in threaded connection with connecting screws, and threaded holes are respectively formed in the front pressing plate 7, the rear pressing plate 4 and the front end pressing plate 10 for being in threaded connection with a front ejector rod 9, a rear ejector rod 6 and a front end ejector rod 12; the front connecting screw rod 8, the front ejector rod 9, the rear connecting screw rod 5, the rear ejector rod 6, the front end connecting screw rod 11 and the front end ejector rod 12 are respectively manufactured through round rods with the diameter of 40mm and are respectively processed with external threads, and the front connecting screw rod, the front ejector rod, the rear ejector rod, the front end connecting screw rod and the front end ejector rod are used for being connected with threaded holes in the structural part tool 3, the front pressing plate 7, the rear pressing plate 4 and the front end pressing plate 10 and pressing two sides of a crack part 2.1 of the base lug seat 2 in the structural part tool 3.
During application, the structural part tool 3 is installed on the base lug seat 2, the rear pressing plate 4, the front pressing plate 7 and the front end pressing plate 10 are fixedly connected onto the structural part tool 3 through the rear connecting screw rod 5, the front connecting screw rod 8 and the front end connecting screw rod 11, then each rear ejector rod 6, each front ejector rod 9 and each front end ejector rod 12 are installed on each pressing plate, each rear ejector rod 6, each front ejector rod 9 and each front end ejector rod 12 respectively abut against the base lug seat 2, meanwhile, the front ejector rods 9 and the rear ejector rods 6 are respectively arranged on two sides of a cracking groove 2.1, it is guaranteed that in the process of welding a cracking position 2.1 on one side, the two sides of the cracking position 2.1 can keep original sizes, and finally welding repair is carried out.
Example 2:
as shown in fig. 1 to 4, the method for welding the crack of the large high-voltage motor base ear seat according to the present invention is performed by using the simple welding device for the crack of the large high-voltage motor base ear seat described in embodiment 1, where the bottom ear seat 2 of the large high-voltage motor 1 has a crack 2.1 after long-term use, and includes the following steps:
step one, preparing before welding;
1.1), welding equipment: the model is HT400D or HT500D digital control inversion type manual shielded metal arc welding and argon arc welding are combined by using a direct current welding machine, and a Z258 welding rod is adopted as a welding material;
1.2), heating device: h01-20 heat gun;
1.3), auxiliary facilities: angle grinder, file, hammer, flat shovel, mask, sample plate, thermodetector, magnifier, and heat insulation cotton;
1.4), weldment material: the body is made of nodular cast iron;
1.5) and the requirements of surfacing before welding are as follows: removing rust, grease and moisture by machining and cleaning the worn surface;
1.6), welding position: welding a V-shaped groove on one side of the whole welding line;
1.7), welding requirements: all welding layers must be free of any welding defects and fused to the base material;
1.8), welding process parameters: setting welding parameters according to welding equipment, welding materials, weldment materials and welding requirements;
parameters of welding process
Step two, welding implementation;
2.1) cutting a single-sided V-shaped groove 2.2 at the cracking position 2.1 of the base lug seat 2 by a manual angle grinder along the cracking position, then installing a structural part tool 3 at the outer side of the base lug seat 2, respectively jacking the horizontal planes at two sides of the V-shaped groove 2.2 of the base lug seat 2 by a front jacking rod 9 and a rear jacking rod 6, jacking the front end part of the base lug seat 2 by a front end part jacking rod 12, then heating to 500-minus-plus-600 ℃ at two sides of the V-shaped groove 2.2 by an oxyacetylene flame baking gun, carrying out temperature verification by adopting a temperature measuring gun, after the temperature is reached, carrying out digital control inverse manual welding rod electric arc welding and argon arc welding by using a direct current welding machine and adopting a Z258 welding rod with the diameter of 3.2mm for bottom layer welding, carrying out large current continuous welding, wherein the welding rod carrying method is a straight line, the root bottom is completely melted, the middle arc length of 8-12mm is adopted, and the combined action of a welding core and a coating, spheroidizing the graphite of the welding seam, and confirming that no welding defects such as cracks and the like exist after welding is finished; in the step, because the chilling tendency and the hardening tendency of the nodular cast iron during welding are greater than those of grey cast iron, a high-temperature preheating welding method with the preheating temperature of generally 500-600 ℃ is adopted, meanwhile, the strength, the plasticity and the toughness of the nodular cast iron are all higher than those of the grey cast iron, and the mechanical property of a welding joint is inevitably required to be matched with that of a base metal, so that a Z258 welding rod is selected, graphite in a welding line is spheroidized through the combined action of a welding core and a coating, and in addition, the welding deformation is prevented through a simple welding device for cracking a bottom lug seat of a large-scale high-voltage motor;
2.2) when the filling layer and the cover surface layer are welded, controlling the interlayer temperature to be kept at 500-600 ℃, also adopting digital control inverse manual welding rod electric arc welding and argon arc welding, using a Z258 welding rod with phi 4.0mm to weld by using a direct current welding machine, wherein the horizontal included angle of the welding rod is 80-90 degrees, the strip conveying method is in a small crescent shape, adopting an arc length with the length of 12-18mm to continuously weld, being beneficial to melting of a coating and transition of graphite into a molten pool, completely covering the head and the tail, immediately adopting hammering to enable the surface of a welding line to be fully covered with pits after welding each layer is finished, and eliminating welding stress; the surfacing layer is higher than the base material when covering the surface, so that the surfacing layer is convenient for manual grinding and smooth transition with the base material;
2.3) and 2.1 of the cracking part, heating the whole welding line by using an H01-20 heating gun to 500-700 ℃ for stress relief and normalizing, gradually cooling to 250 ℃, integrally covering by using heat preservation cotton, cooling to room temperature, then disassembling the simple welding device for cracking the large-scale high-voltage motor base, confirming that the welding line has no any defect by detecting and detecting flaws, precisely grinding the welding line of the processed base lug seat 2 by using a manual angle grinder, comparing by using a first-made conforming sample plate, and recovering the use tolerance size.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (8)
1. The utility model provides a simple and easy welding set of large-scale high-voltage motor base ear fracture which characterized in that: the structure comprises a U-shaped structure tool (3), wherein the structure tool (3) comprises two side plates (3.1) which are arranged in parallel and a rear baffle (3.2) which is fixedly connected to the same side end part of the two side plates (3.1), two pairs of bulges (3.3) are correspondingly arranged on two sides of the top of the two side plates (3.1) respectively, a front pressing plate (7) and a rear pressing plate (4) are detachably arranged on the tops of the two pairs of corresponding bulges (3.3) respectively, a plurality of front ejector rods (9) and a plurality of rear ejector rods (6) are arranged on the front pressing plate (7) and the rear pressing plate (4) in a penetrating mode respectively, a front end pressing plate (10) is detachably arranged on the other side end part of the two side plates (3.1), and a plurality of front end ejector rods (12) are arranged on the front end pressing plate (10) in a penetrating mode.
2. The simple welding device for cracking of the large-scale high-voltage motor base lug according to claim 1, characterized in that: the two ends of the front pressing plate (7) and the rear pressing plate (4) are detachably connected and fixed with the corresponding bulges (3.1) on the side plates (3.1) through the front connecting screw rod (8) and the rear connecting screw rod (5).
3. The simple welding device for cracking of the large-scale high-voltage motor base lug according to claim 1 or 2, characterized in that: the two ends of the front end pressing plate (10) are detachably connected and fixed with the end parts of the two side plates (3.1) through front end screw rods (11).
4. The simple welding device for cracking of the large-scale high-voltage motor base lug according to claim 3, characterized in that: the side plate (3.1) and the rear baffle (3.2) are fixed by welding.
5. The simple welding device for cracking of the large-scale high-voltage motor base lug according to claim 4, characterized in that: the structural part tool (3), the front pressing plate (7), the rear pressing plate (4) and the front end pressing plate (10) are respectively manufactured by steel plates with the thickness of 50 mm; the front connecting screw rod (8), the front ejector rod (9), the rear connecting screw rod (5), the rear ejector rod (6), the front end connecting screw rod (11) and the front end ejector rod (12) are all manufactured through round rods with the diameter of 40mm respectively.
6. A method for welding the bottom lug base of a large high-voltage motor (1) with a crack (2.1) after long-term use is characterized in that the method is carried out by using the simple welding device for the bottom lug base of the large high-voltage motor (1) with the crack as set forth in any one of claims 1-5, and comprises the following steps:
step one, preparing before welding;
1.1), welding equipment: digitally controlling inverse manual shielded metal arc welding and argon arc welding and using a direct current welding machine, wherein a Z258 welding rod is adopted as a welding material;
1.2), heating device: h01-20 heat gun;
1.3), auxiliary facilities: angle grinder, file, hammer, flat shovel, mask, sample plate, thermodetector, magnifier, and heat insulation cotton;
1.4), weldment material: the body is made of nodular cast iron;
1.5) and the requirements of surfacing before welding are as follows: removing rust, grease and moisture by machining and cleaning the worn surface;
1.6), welding position: welding a V-shaped groove on one side of the whole welding line;
1.7), welding requirements: all welding layers must be free of any welding defects and fused to the base material;
1.8), welding process parameters: setting welding parameters according to welding equipment, welding materials, weldment materials and welding requirements;
step two, welding implementation;
2.1) cutting a single-sided V-shaped groove (2.2) at the cracking position (2.1) of the bottom lug seat (2) by adopting a manual angle grinder along the cracking position, then installing a structural part tool (3) on the bottom lug seat (2), respectively jacking horizontal planes at two sides of the V-shaped groove (2.2) of the bottom lug seat (2) through a front jacking rod (9) and a rear jacking rod (6), jacking the front end part of the bottom lug seat (2) through a front end jacking rod (12), then heating to 500-600 ℃ by using an oxyacetylene flame baking gun at 20-30mm of two sides of the V-shaped groove (2.2), verifying the temperature by adopting a temperature measuring gun, carrying out digital control inversion manual electric arc welding and argon arc welding by using a direct current welding machine and carrying out bottom welding by using a Z258 welding rod with phi of 3.2mm after the temperature reaches, wherein the welding rod carrying method is linear, the root bottom is melted through, and the continuous welding is carried out by adopting the medium arc length of 8-12mm, the welding core and the coating are acted together to spheroidize the graphite of the welding seam, and no welding defects such as cracks and the like are confirmed after the welding is finished;
2.2) when the filling layer and the cover surface layer are welded, controlling the interlayer temperature to be kept at 500-600 ℃, also adopting digital control inverse manual welding rod electric arc welding and argon arc welding, using a Z258 welding rod with phi 4.0mm to weld by using a direct current welding machine, wherein the horizontal included angle of the welding rod is 80-90 degrees, the strip conveying method is in a small crescent shape, adopting an arc length with the length of 12-18mm to continuously weld, being beneficial to melting of a coating and transition of graphite into a molten pool, completely covering the head and the tail, immediately adopting hammering to enable the surface of a welding line to be fully covered with pits after welding each layer is finished, and eliminating welding stress; the surfacing layer is higher than the base material when covering the surface, so that the surfacing layer is convenient for manual grinding and smooth transition with the base material;
2.3) and 2.1, after the whole welding of the cracking part is finished, heating the whole welding line by using an H01-20 heating gun at 500-700 ℃ for stress elimination and normalizing treatment, gradually cooling to 250 ℃, then integrally covering by using heat preservation cotton and cooling to room temperature, then disassembling the simple welding device for cracking the large-scale high-voltage motor base lug, confirming that the welding line has no any defect by detecting and detecting flaws, precisely grinding the welding line of the processed base lug (2) by using a manual angle grinder, comparing by using a sample plate which is manufactured in advance and accords with the standard, and recovering the use tolerance size.
7. The method for welding the large high-voltage motor base lug seat according to claim 6, wherein the welding method comprises the following steps: the welding equipment is a welding machine combining digital control inversion type manual shielded metal arc welding and argon arc welding with the model number of HT400D or HT 500D.
8. The method for welding the large high-voltage motor base lug seat according to claim 6, wherein the welding method comprises the following steps: when the bottom layer is welded, a Z258 welding rod with the diameter of 3.2mm is adopted, the welding current is 110-140A, the arc voltage is 25 +/-1V, and the welding speed is 17 +/-1 cm/min; when the overlaying layer is welded, a Z258 welding rod with phi of 4.0mm is adopted, the welding current is 160-200A, the arc voltage is 28 +/-1V, and the welding speed is 19 +/-1 cm/min.
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