CN114393277B - Welding process for overlaying wear-resistant layer on U-shaped grinding plate of coke pushing rod - Google Patents

Welding process for overlaying wear-resistant layer on U-shaped grinding plate of coke pushing rod Download PDF

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CN114393277B
CN114393277B CN202210105368.9A CN202210105368A CN114393277B CN 114393277 B CN114393277 B CN 114393277B CN 202210105368 A CN202210105368 A CN 202210105368A CN 114393277 B CN114393277 B CN 114393277B
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welding
wear
surfacing
layer
shaped
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CN114393277A (en
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范兴海
朱泽华
张玉
刘贵亮
张�浩
陶俊
徐建辉
吴国斌
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Anhui Magang Equipment Maintenance Co ltd
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Anhui Magang Equipment Maintenance Co ltd
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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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/16—Arc welding or cutting making use of shielding gas
    • 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
    • B23K9/235—Preliminary treatment
    • 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
    • B23K9/32—Accessories
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
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  • Arc Welding In General (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

The invention discloses a welding process of a build-up welding wear-resistant layer of a U-shaped grinding plate of a coke pushing rod, which is implemented through a simple auxiliary tool, wherein the auxiliary tool comprises a structural member portal, and the structural member portal comprises a portal bracket and side frames symmetrically arranged on two sides of the portal bracket; the upper surface of the door-shaped bracket is provided with a plurality of pressing plate mounting grooves, and adjusting tool mounting grooves are correspondingly arranged between the side surface of the door-shaped bracket and the inner side of the side frame respectively; a pair of L-shaped anti-deformation pressing plates are movably arranged on the front side and the rear side in each pressing plate mounting groove respectively, and each L-shaped anti-deformation pressing plate is provided with a locking screw rod; and the front side and the rear side of the two corresponding adjusting tool mounting grooves on each side of the door-shaped bracket are respectively provided with an adjusting and fixing structural member tool. The invention has the advantages of low investment cost, convenient field operation and maintenance and short repair time, and the bottom surface of the U-shaped grinding plate after welding repair can meet the requirement of periodic operation and use.

Description

Welding process for overlaying wear-resistant layer on U-shaped grinding plate of coke pushing rod
Technical Field
The invention belongs to the technical field of welding, and relates to a welding process for overlaying a wear-resistant layer on a U-shaped grinding plate of a coke pushing rod.
Background
The four large locomotives of the coke oven mainly comprise a coal charging car, a coke pushing car, a coke guide car and a coke quenching car. The coke pusher is an important device for coke oven production, and mainly consists of a steel structure, a travelling device, a door taking device, a coal leveling device, a coke pushing device and the like. The coke pushing device mainly comprises a coke pushing transmission device (a motor, a speed reducer, a band-type brake and a coke pushing driving gear), and a coke pushing rod device (a coke pushing rod head, a coke pushing rod, various carrier rollers, a coke pushing rod triangular bracket and a sliding seat). The coke pushing rod has the main function of pushing out mature coke in the coking chamber of the coke oven, guiding the coke into the coke guide grating of the coke guide, and then falling into the coke quenching car for quenching treatment. The center of gravity of the pushing ram continuously moves forward in the advancing process, the tripod and the sliding seat are arranged at the front end of the pushing ram to play a supporting role, the sliding seat rotates flexibly on the rotating shaft and is 30-50mm higher than a brick at the bottom of the carbonization chamber (the sliding seat is convenient to enter the carbonization chamber), the sliding seat can smoothly enter the carbonization chamber along with the advancing of the pushing ram, the lower part of the sliding seat is provided with a U-shaped grinding plate, as shown in the U-shaped grinding plate 2 in fig. 1, the two ends of the U-shaped grinding plate slightly lift up to form a radian plate 22, the arc plate is convenient to move back and forth, the pushing ram mainly plays a supporting and stabilizing role by virtue of a supporting roller of the pushing ram and a sliding seat of the tripod after entering the carbonization chamber, namely the grinding plate under the sliding seat continuously rubs with coke at the bottom brick of the coke oven carbonization chamber and the upper surface of the bottom brick in the production process, meanwhile, the temperature in the carbonization chamber reaches 1000 ℃, the U-shaped grinding plate is made to be a 16Mn steel plate for convenience, but other performance indexes are insufficient in the actual use process of the site working conditions, the bottom of the U-shaped grinding plate is easy to cause abrasion, the irregular and frequent change is influenced; if the wear-resistant plate meeting the hardness requirement is selected for manufacturing, the cost is high, the radian of the U-shaped wear-resistant plate is difficult to manufacture, and the U-shaped wear-resistant plate cannot be matched with integral structural member equipment for use.
Disclosure of Invention
Aiming at the problems that the bottom surface of a U-shaped grinding plate is easy to wear, needs to be replaced frequently at random and affects the production rhythm in the background technology, the welding device and the welding process of the overlaying wear-resistant layer of the U-shaped grinding plate of the pushing ram are implemented, so that the investment cost is low, the on-site operation and maintenance are convenient, the repair time is short, and the bottom surface of the U-shaped grinding plate after welding repair can meet the requirement of periodic operation and use.
The technical scheme for solving the technical problems is as follows:
the invention relates to a welding process of a build-up welding wear-resistant layer of a U-shaped grinding plate of a coke pushing rod, wherein two sides of the U-shaped grinding plate are respectively provided with an arc plate, the U-shaped grinding plate is welded by an auxiliary tool, and an even number of build-up welding wear-resistant surfaces are formed on the surface of the U-shaped grinding plate by welding; the auxiliary tool comprises a structural member portal frame, wherein the structural member portal frame comprises a portal bracket and side frames symmetrically arranged on two sides of the portal bracket, the upper surface of the portal bracket is provided with a plurality of inverted T-shaped pressing plate mounting grooves, and adjusting tool mounting grooves are correspondingly formed between the two side surfaces of the portal bracket and the inner sides of the side frames respectively; a pair of L-shaped anti-deformation pressing plates are movably arranged on the front side and the rear side in each pressing plate mounting groove respectively, the lower parts of the L-shaped anti-deformation pressing plates are in an inverted T shape and are embedded and mounted in the pressing plate mounting grooves, the upper parts of the L-shaped anti-deformation pressing plates are in an L shape and are provided with threaded holes, and locking screws are arranged in the threaded holes; the front side and the rear side of the inside of the two corresponding adjusting tool mounting grooves on each side of the portal support are respectively provided with an adjusting and fixing structural member tool, the adjusting and fixing structural member tool comprises a fixed block, the two ends of the fixed block are matched with the adjusting tool mounting grooves, and the inner side of the fixed block is rotatably provided with an adjusting block in a concave shape; the welding process comprises the following steps:
step one, fixing a U-shaped grinding plate;
the U-shaped grinding plate is horizontally placed on the door-shaped support, radian plates at two sides of the U-shaped grinding plate are respectively inserted into adjusting blocks of the adjusting and fixing structural member tools at two sides of the door-shaped support, the positions of the adjusting blocks are adjusted, the L-shaped anti-deformation pressing plates are respectively installed in the pressing plate installation grooves at two sides of the U-shaped grinding plate, then the U-shaped grinding plate is locked through locking screws, and welding of all surfacing wear-resistant surfaces can be carried out;
step two, preparing before welding;
2.1 -welding equipment: the digital control inversion type manual welding rod arc welding and argon arc welding are combined by a direct current welding machine, H1Cr18Ni9Ti welding wires with phi of 2.5mm are adopted as welding materials of a bottoming transition layer, CAG-CO21 welding wires or D707 welding wires with phi of 4.0mm are adopted as welding materials of a surface wear-resistant alloy layer, and the argon purity is more than or equal to 99.999%;
2.2 A heating device): an electric heating belt;
2.3 -auxiliary facilities): angle grinder, file, hand hammer, flat spade, face mask, sample plate, thermometer, magnifying glass and heat preservation cotton;
2.4 Weld material): body 16Mn, transition layer stainless steel H1Cr18Ni9Ti, outer layer wear-resistant alloy steel CAG-CO21 or D707;
2.5 Surfacing requirements before welding): cleaning the worn surface by a manual angle grinder to remove rust, grease and moisture, and preheating by using an electric heating belt;
2.6 A) welding position: horizontally overlaying;
2.7 -welding requirements): all the welding layers must be free of any welding defects and fused to the base material;
2.8 And welding process parameters: setting welding parameters according to welding equipment, welding materials, weldment materials and welding requirements;
step three, welding is carried out;
2.1 After the positions of all surfacing wear-resistant surfaces to be welded on the surface of the U-shaped grinding plate are preheated to 150 ℃ by an electric heating belt, two welding devices are utilized to simultaneously carry out symmetrical welding of a bottoming transition layer at the positions of two surfacing wear-resistant surfaces, the bottoming first layer is welded transversely, the thickness of the welding layers is strictly controlled to be 2-4 mm by adopting a straight line strip conveying method, meanwhile, the connection fusion between mutual welding passes and the fusion of bottom layers are ensured, after the whole bottom layer welding at each surfacing wear-resistant surface position is completed, the surface of a welding seam is polished to be smooth by adopting a manual angle grinder, after no defect is detected, heat preservation cotton is adopted for wrapping and preserving, and then symmetrical welding is carried out at each other two surfacing wear-resistant surface positions to be welded sequentially by using the same welding process until the bottoming transition layer at all surfacing wear-resistant surface positions is finished;
2.2 After all welding of the bottoming transition layers are finished and confirmed to be defect-free, carrying out symmetrical surfacing of a surface surfacing layer on the bottoming transition layers at two surfacing wear-resistant surface positions by utilizing two welding equipment, wherein the welding sequence is longitudinal welding, the welding method is crescent, the thickness is controlled to be 3-5 mm, meanwhile, the fusion connection of mutual welding passes and the fusion of a bottom layer are ensured, after the welding is finished, the surface symmetry surfacing of the bottoming transition layers at other every two surfacing wear-resistant surface positions is sequentially carried out in the same mode by manually grinding to the use size and confirming that no defect exists until the surface welding of the bottoming transition layers at all surfacing wear-resistant surface positions is finished;
2.3 And (3) ensuring that all surfacing wear-resistant surfaces have no welding defects, carrying out leveling grinding on the surface of a welding seam to reach a use size by using a manual angle grinder, carrying out postweld heat treatment by using an electric heating belt again, heating the whole surfacing wear-resistant surfaces to 300-350 ℃, ensuring that the temperature is uniformly increased and kept constant for 2 hours, then gradually cooling to room temperature, and recovering to use the tolerance size and delivering to use after detecting flaw detection to confirm that no defects exist.
Further, when the backing transition layer is welded, H1Cr18Ni9Ti welding wires with the diameter of phi of 2.5mm are adopted, the welding current is 80-140A, preferably 90-110A, the arc voltage is 24+/-1V, and the welding speed is 13+/-1 cm/min; when the surface overlaying layer is welded, CAG-CO21 welding wires with the diameter of 4.0mm are adopted, the welding current is 170-190A, preferably 170-180A, the arc voltage is 26+/-1V, and the welding speed is 12+/-1 cm/min.
Further, in the post-weld heat treatment, the temperature was raised at a rate of 50 ℃/h.
Compared with the prior art, the welding process of the overlaying wear-resistant layer of the U-shaped grinding plate of the coke pushing rod is implemented through a simple auxiliary tool, is safe and easy to operate, stable in welding quality and low in investment cost, meets the actual requirements of the site, is high in working efficiency, greatly reduces maintenance cost, reduces shutdown loss, provides a guarantee for reasonable production, and simultaneously provides scientific reference basis for welding and repairing other large-sized workpieces.
Drawings
FIG. 1 is a schematic view of a U-shaped grinding plate according to the present invention;
FIG. 2 is a schematic structural diagram of an auxiliary tool in the invention;
FIG. 3 is a schematic view of the structure of the structural portal of the present invention;
FIG. 4 is an exploded view of the auxiliary tool of the present invention;
FIG. 5 is a schematic diagram of the welding of the surfacing wear-resistant surface in the present invention;
in the figure: 1. a structural member portal; 11. a portal frame; 12. a side frame; 13. a platen mounting groove; 14. adjusting a tool mounting groove; 2. u-shaped grinding plate; 21. surfacing a wear-resistant surface; 22. a radian plate; 3. an L-shaped deformation-preventing pressing plate; 31. a threaded hole; 4. locking the screw rod; 5. adjusting a fixture of a fixed structural member; 51. a fixed block; 52. an adjusting block; .
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.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. As used in the specification and claims of the present disclosure, "upper", "lower", "left", "right", "front", "rear", "inner", "outer", and the like are used merely to indicate relative positional relationships, which change when the absolute position of the object to be described changes accordingly.
As shown in fig. 1 to 5, in the welding process of the overlaying wear-resistant layer of the U-shaped grinding plate of the coke pushing rod, two sides of the U-shaped grinding plate 2 are respectively provided with an arc plate 22, the U-shaped grinding plate 2 is welded and implemented through an auxiliary tool, an even number of overlaying wear-resistant surfaces 21 are formed on the surface of the U-shaped grinding plate 2, and in this example, 4 overlaying wear-resistant surfaces 21 are welded on the surface of the U-shaped grinding plate 2 for illustration; the auxiliary tool comprises a structural member portal 1, wherein the structural member portal 1 comprises a portal bracket 11 and side frames 12 symmetrically arranged at two sides of the portal bracket 11, 3 inverted T-shaped pressing plate mounting grooves 13 are formed in the upper surface of the portal bracket 11, and the positions of the pressing plate mounting grooves 13 are determined according to the positions of 4 surfacing wear-resistant surfaces 21 to be welded on the surface of a U-shaped grinding plate 2; an adjusting tool mounting groove 14 is correspondingly formed between the two side surfaces of the door-shaped bracket 11 and the inner side of the side frame 12; a pair of L-shaped anti-deformation pressing plates 3 are movably arranged on the front side and the rear side in each pressing plate mounting groove 13 respectively, the lower parts of the L-shaped anti-deformation pressing plates 3 are in an inverted T shape and are embedded and mounted in the pressing plate mounting grooves 13, the upper parts of the L-shaped anti-deformation pressing plates are in an L shape and are provided with threaded holes 31, and locking screws 4 are arranged in the threaded holes 31; the front side and the rear side in the two corresponding adjusting tool mounting grooves 14 on each side of the portal frame 11 are respectively provided with an adjusting and fixing structural member tool 5, the adjusting and fixing structural member tool 5 comprises a fixed block 51 with two ends matched with the adjusting tool mounting grooves 14, and the inner side of the fixed block 51 is rotatably provided with an adjusting block 52 in a concave shape; the welding process comprises the following steps:
step one, fixing a U-shaped grinding plate;
the U-shaped grinding plate 2 is horizontally placed on the door-shaped bracket 11, radian plates 22 on two sides of the U-shaped grinding plate 2 are respectively inserted into adjusting blocks 52 of each adjusting and fixing structural member tool 5 on two sides of the door-shaped bracket 11, positions of the adjusting blocks are adjusted, each pair of L-shaped anti-deformation pressing plates 3 are respectively installed in the pressing plate installation grooves 13 on two sides of the U-shaped grinding plate 2, then the U-shaped grinding plate 2 is locked through the locking screw 4, namely the U-shaped grinding plate 2 is rigidly fixed, and then welding of each surfacing wear-resistant surface 21 can be carried out;
step two, preparing before welding;
2.1, welding equipment: the model is HT400D or HT500D digital control inversion type manual welding rod arc welding and argon arc welding are combined by a direct current welding machine, H1Cr18Ni9Ti welding wires with phi of 2.5mm are adopted as a backing transition layer welding material, CAG-CO21 welding wires or D707 welding wires with phi of 4.0mm are adopted as a surface wear-resistant alloy layer welding material, and the argon purity is more than or equal to 99.999%;
2.2, heating device: an electric heating belt;
2.3, auxiliary facilities: angle grinder, file, hand hammer, flat spade, face mask, sample plate, thermometer, magnifying glass and heat preservation cotton;
2.4, weldment material: body 16Mn, transition layer stainless steel H1Cr18Ni9Ti, outer layer wear-resistant alloy steel CAG-CO21 or D707;
2.5, surfacing welding requirements before welding: cleaning the worn surface by a manual angle grinder to remove rust, grease and moisture, and preheating to 150 ℃ by using an electric heating belt;
2.6, welding position: horizontally overlaying;
2.7, welding requirements: all the welding layers must be free of any welding defects and fused to the base material;
2.8, welding technological parameters: setting welding parameters according to welding equipment, welding materials, weldment materials and welding requirements;
welding process parameters
Figure GDA0004223059880000051
Step three, welding is carried out;
2.1, after the positions of all surfacing wear-resistant surfaces 21 to be welded on the surface of a U-shaped grinding plate 2 are preheated to 150 ℃ by an electric heating belt, two welding devices are utilized to simultaneously carry out symmetrical welding of a bottoming transition layer at the positions of two surfacing wear-resistant surfaces 21, for example, the positions of the 2 nd and 4 th surfacing wear-resistant surfaces 21 are simultaneously and symmetrically welded, as shown in fig. 5, the bottoming first layer is welded transversely, a straight line strip method is adopted, H1Cr18Ni9Ti welding wires are selected as bottoming transition layer welding wires, cracks are not generated between the welding wires and layering of a base material, on the other hand, the welding wires are in fusion transition with surfacing surface layer wear-resistant alloy materials, so that various welding defects and use quality are avoided, but the thickness of the welding layers is strictly controlled to be 2-4 mm, meanwhile, the welding current is controlled to be between 90-110A, the surface is flattened by adopting a manual angle grinder after the integral bottom layer welding at the positions of each surfacing wear-resistant surface is finished, no defect is detected by visual inspection or amplification, and then the first surfacing wear-resistant surface 21 is welded by adopting the same heat insulation technology; in the welding process of the bottoming transition layer, if the weld defect is found, adopting a hand-angle grinder to remove part of the weld defect, and adopting a bottoming welding process to repair the weld;
2.2, after all welding of the bottoming transition layer is finished and confirmed to be defect-free, welding the surface surfacing layer on the bottoming transition layer at the position of two (such as the 2 nd and the 3 rd) surfacing wear-resistant surfaces 21 by utilizing two welding devices, wherein the welding material is CAG-CO21 wear-resistant alloy material or D707 welding rod, as shown in figure 5, the surface surfacing layer is designed into longitudinal welding for better fusing the bottom layer and reducing the moving resistance of the welding seam in the actual use process, the welding method is crescent, the welding quality of the surface surfacing layer is strictly controlled to be 3-5 mm in thickness, meanwhile, the welding current is controlled to be 170-180A to ensure the fusion connection of the mutual welding beads and the fusion of the bottom layer, after the welding is finished, the surface surfacing of the bottoming transition layer at the positions of the other two (the 1 st and the 4 th) surfacing wear-resistant surfaces 21 is finished in the same manner after the manual grinding to the use size and the confirmation of no defect;
2.3, after all the surfacing wear-resistant surfaces 21 are ensured to have no welding defects and the surface of the welding seam is flattened and ground to be in a use size by using a manual angle grinder, the whole surfacing wear-resistant surfaces 21 are heated to 300-350 ℃ by using an electric heating belt again, the temperature is ensured to be uniformly increased at 50 ℃/h and kept constant for 2 hours, then the surfacing wear-resistant surfaces are gradually cooled to the room temperature, and after the inspection flaw detection confirms that no defects exist, the use tolerance size is recovered, the surfacing wear-resistant surfaces are put into use, and the mechanical performance effect is achieved through periodic operation.
The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention should be defined by the claims.

Claims (4)

1. Welding process of pushing ram U type grinding plate build-up welding wearing layer, U type grinding plate (2) both sides are provided with radian board (22) respectively, its characterized in that: welding the U-shaped grinding plate (2) through an auxiliary tool, and welding the surface of the U-shaped grinding plate (2) to form an even number of surfacing wear-resistant surfaces (21); the auxiliary tool comprises a structural member portal frame (1), wherein the structural member portal frame (1) comprises a portal frame (11) and side frames (12) symmetrically arranged on two sides of the portal frame (11), a plurality of inverted T-shaped pressing plate mounting grooves (13) are formed in the upper surface of the portal frame (11), and adjusting tool mounting grooves (14) are correspondingly formed between the two side surfaces of the portal frame (11) and the inner sides of the side frames (12) respectively; a pair of L-shaped anti-deformation pressing plates (3) are movably arranged on the front side and the rear side in each pressing plate mounting groove (13), the lower parts of the L-shaped anti-deformation pressing plates (3) are in an inverted T shape and are embedded and mounted in the pressing plate mounting grooves (13), the upper parts of the L-shaped anti-deformation pressing plates are in an L shape and are provided with threaded holes (31), and locking screws (4) are arranged in the threaded holes (31); the front side and the rear side in two corresponding adjusting tool mounting grooves (14) on each side of the portal support (11) are respectively provided with an adjusting and fixing structural member tool (5), the adjusting and fixing structural member tool (5) comprises a fixed block (51) with two ends matched with the adjusting tool mounting grooves (14), and the inner side of the fixed block (51) is rotatably provided with an adjusting block (52) in a concave shape; the welding process comprises the following steps:
step one, fixing a U-shaped grinding plate;
the U-shaped grinding plate (2) is horizontally placed on the door-shaped bracket (11), radian plates (22) on two sides of the U-shaped grinding plate (2) are respectively inserted into adjusting blocks (52) of each adjusting and fixing structural member tool (5) on two sides of the door-shaped bracket (11) and are well adjusted, each pair of L-shaped anti-deformation pressing plates (3) are respectively installed in the pressing plate installation groove (13) on two sides of the U-shaped grinding plate (2), then the U-shaped grinding plate (2) is locked through the locking screw (4), and welding of each surfacing wear-resistant surface (21) can be carried out;
step two, preparing before welding;
2.1 -welding equipment: the digital control inversion type manual welding rod arc welding and argon arc welding are combined by a direct current welding machine, H1Cr18Ni9Ti welding wires with phi of 2.5mm are adopted as welding materials of a bottoming transition layer, CAG-CO21 welding wires or D707 welding wires with phi of 4.0mm are adopted as welding materials of a surface wear-resistant alloy layer, and the argon purity is more than or equal to 99.999%;
2.2 A heating device): an electric heating belt;
2.3 -auxiliary facilities): angle grinder, file, hand hammer, flat spade, face mask, sample plate, thermometer, magnifying glass and heat preservation cotton;
2.4 Weld material): body 16Mn, transition layer stainless steel H1Cr18Ni9Ti, outer layer wear-resistant alloy steel CAG-CO21 or D707;
2.5 Surfacing requirements before welding): cleaning the worn surface by a manual angle grinder to remove rust, grease and moisture, and preheating by using an electric heating belt;
2.6 A) welding position: horizontally overlaying;
2.7 -welding requirements): all the welding layers must be free of any welding defects and fused to the base material;
2.8 And welding process parameters: setting welding parameters according to welding equipment, welding materials, weldment materials and welding requirements;
step three, welding is carried out;
3.1 After the positions of all surfacing wear-resistant surfaces (21) to be welded on the surface of the U-shaped grinding plate (2) are preheated to 150 ℃ by an electric heating belt, two welding devices are utilized to simultaneously carry out symmetrical welding of a bottoming transition layer at the positions of two surfacing wear-resistant surfaces (21), the bottoming first layer is welded transversely, a straight line strip conveying method is adopted, the thickness of a welding layer is strictly controlled to be 2-4 mm, meanwhile, connection fusion between mutual welding passes and fusion of a bottom layer are ensured, after the whole bottom layer welding at the positions of each surfacing wear-resistant surface (21) is completed, the surface of a welding seam is polished to be smooth by a manual angle grinder, after no defects are detected, heat preservation cotton wrapping and heat preservation are adopted, and then symmetrical welding is carried out at the positions of other surfacing wear-resistant surfaces (21) to be welded sequentially by using the same welding technology until the bottoming transition layer at the positions of all surfacing wear-resistant surfaces (21) is finished;
3.2 After all welding of the bottoming transition layers are finished and confirmed to be defect-free, carrying out symmetrical surfacing of a surface surfacing layer on the bottoming transition layers at the positions of two surfacing wear-resistant surfaces (21) by utilizing two welding equipment, wherein the welding sequence is longitudinal welding, the welding method is crescent, the thickness is controlled to be 3-5 mm, meanwhile, the fusion connection of mutual welding passes and the fusion of the bottom layers are ensured, after the welding is finished, the surface symmetry surfacing of the bottoming transition layers at the positions of every two other surfacing wear-resistant surfaces (21) is sequentially carried out in the same way by manually grinding to the use size and confirming that no defect exists until the surface welding of the bottoming transition layers at the positions of all surfacing wear-resistant surfaces (21) is finished;
3.3 And (3) ensuring that all the surfacing wear-resistant surfaces (21) have no welding defects, carrying out leveling and grinding on the surface of a welding seam to a use size by using a manual angle grinder, carrying out postweld heat treatment by using an electric heating belt again, heating the whole surfacing wear-resistant surfaces (21) to 300-350 ℃, ensuring that the temperature is uniformly increased and kept constant for 2 hours, then gradually cooling to the room temperature, and restoring to the use tolerance size and delivering to use after detecting and detecting flaw detection to confirm that no defects exist.
2. The welding process of the overlaying wear-resistant layer of the U-shaped grinding plate of the coke pushing rod, which is characterized in that when the backing transition layer is welded, H1Cr18Ni9Ti welding wires with the diameter of 2.5mm are adopted, the welding current is 80-140A, the arc voltage is 24+/-1V, and the welding speed is 13+/-1 cm/min; when the surface surfacing layer is welded, CAG-CO21 welding wires with the diameter of 4.0mm are adopted, the welding current is 170-190A, the arc voltage is 26+/-1V, and the welding speed is 12+/-1 cm/min.
3. The welding process of the overlaying wear-resistant layer of the U-shaped grinding plate of the coke pushing rod, which is characterized in that when the backing transition layer is welded, the welding current is 90-110A, the arc voltage is 24+/-1V, and the welding speed is 13+/-1 cm/min; when the surface surfacing layer is welded, CAG-CO21 welding wires with the diameter of 4.0mm are adopted, the welding current is 170-180A, the arc voltage is 26+/-1V, and the welding speed is 12+/-1 cm/min.
4. The welding process for overlaying the wear-resistant layer on the U-shaped grinding plate of the coke pusher according to claim 1, wherein the temperature rises at a speed of 50 ℃/h during the postweld heat treatment.
CN202210105368.9A 2022-01-28 2022-01-28 Welding process for overlaying wear-resistant layer on U-shaped grinding plate of coke pushing rod Active CN114393277B (en)

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JP2000202626A (en) * 1999-01-20 2000-07-25 Daido Steel Co Ltd Al BASE STRUCTURE WITH HARD BUILT-UP LAYER, AND COMPOSITE MATERIAL FOR CLADDING BY WELDING USED THEREFOR
CN201144214Y (en) * 2007-12-13 2008-11-05 王利传 Novel sliding plate of coke pusher
CN201737890U (en) * 2010-07-15 2011-02-09 太原煤气化股份有限公司焦化厂 Wear-resistant slide plate of coke pushing machine
CN104308327A (en) * 2014-10-27 2015-01-28 西安航空动力股份有限公司 Technique for preventing defects of surfacing wear-resistant layer of part
CN109894716B (en) * 2019-04-09 2023-05-16 安徽马钢设备检修有限公司 Air welding repair process and equipment for middle section abrasion of horizontal roll shaft of tire rolling mill
CN112935479A (en) * 2021-03-25 2021-06-11 安徽马钢设备检修有限公司 Welding device and repairing process for large wheel fixing table base fracture
CN113182646A (en) * 2021-06-16 2021-07-30 安徽马钢设备检修有限公司 Surfacing device and repairing process for abrasion of large vertical shaft end of finishing mill

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