CN111360363A - Manual gas welding repair device and repair process for large heat-resistant steel heating furnace door - Google Patents
Manual gas welding repair device and repair process for large heat-resistant steel heating furnace door Download PDFInfo
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- CN111360363A CN111360363A CN202010349194.1A CN202010349194A CN111360363A CN 111360363 A CN111360363 A CN 111360363A CN 202010349194 A CN202010349194 A CN 202010349194A CN 111360363 A CN111360363 A CN 111360363A
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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
- B23K5/00—Gas flame welding
- B23K5/18—Gas flame welding for purposes other than joining parts, e.g. built-up welding
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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
- B23K5/00—Gas flame welding
- B23K5/006—Gas flame welding specially adapted for particular articles or work
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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
- B23K5/00—Gas flame welding
- B23K5/213—Preliminary treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2884—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for welds
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- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
The invention discloses a manual gas welding repair device for a large heat-resistant steel heating furnace door, wherein the furnace door is of a cuboid hollow structure and comprises a front panel and a rear panel of the furnace door, a plurality of fixing rods are uniformly arranged in the furnace door, and the furnace door also comprises a rectangular fixing bottom steel plate, a pressure test water inlet pipe and a pressure test water outlet pipe; a plurality of groups of vertical H-shaped steel supporting frames are symmetrically arranged on the left and right of the fixed bottom steel plate, and a horizontal H-shaped steel supporting frame with the height lower than that of the vertical H-shaped steel supporting frames is arranged between each group of vertical H-shaped steel supporting frames; the pressure test water inlet pipe and the pressure test water outlet pipe are respectively arranged on two sides in the furnace door, and one end pipe heads of the pressure test water inlet pipe and the pressure test water outlet pipe are arranged upwards. The invention has the advantages of safety, easy operation, stable welding quality, low investment cost, high working efficiency, capability of meeting the actual requirements on site, great reduction of maintenance cost, reduction of shutdown loss of the heating annular furnace and guarantee for reasonable assembly and production of wheels and ring heating steel ingots of various specifications.
Description
Technical Field
The invention belongs to the technical field of repair of large heat-resistant steel heating furnaces, and relates to a manual gas welding repair device and a repair process for a large heat-resistant steel heating furnace door.
Background
The main working flow of the heating annular furnace of the rail transport for horse steel company is that each cut and formed steel ingot is fed into the furnace from a feed inlet of the heating furnace through a movable charging machine, then the steel ingot is heated for a circle along with the set time, temperature and moving track in the annular furnace, the heated steel ingot enters and is clamped out from a discharge outlet of the heating annular furnace through a fixed manipulator, and the steel ingot is placed into various forming molds below a rolling mill for upsetting and punching, so that the critical standardized first process for producing finished wheels and ring pieces is accurately achieved.
The furnace door of the heat-resistant steel inlet and outlet of the steel ingot heating annular furnace is in a cuboid shape, the front and the back of the furnace door are respectively a furnace door front panel and a furnace door back panel, a plurality of fixing rods which are arranged in a sectional sequencing mode are welded and fixed in the inner space of the furnace door, an inlet and outlet cold and hot water pressure system is arranged in the inner structure, the temperature for heating the steel ingot in the whole furnace is ensured by the furnace door which is closed in a matching mode, but the heat-resistant steel inlet and outlet furnace door is matched with an inlet and outlet to move up and down and close and open at any time under high temperature in the furnace for a long time, so that the local part of the inner panel and the outer panel of the furnace door is uneven and gradually oxidized, in addition, iron oxide, water rust and the like which are generated by long-time internal cleaning of the heat-resistant steel furnace door corrode the inner furnace door panel, therefore, the heating control temperature of the steel ingot in the whole furnace is influenced, if a new heat-resistant steel inlet and outlet port furnace door of the steel ingot heating annular furnace is replaced, the cost of million spare parts is needed, and the period of purchasing and processing new spare parts is long due to no spare parts, so that the production is influenced. In order to restore production as soon as possible, aiming at the characteristic that sand holes appear on the panel locally, the traditional welding method is adopted: the manual shielded metal arc welding, the carbon dioxide gas shielded welding and the argon arc welding are not suitable for repair welding, and the problem of benefit ratio exists if special welding is adopted. Therefore, a repair device and a repair process for a large heat-resistant steel heating furnace door are needed to solve the problem.
Disclosure of Invention
Aiming at the problems that the large heat-resistant steel heating furnace door in the background technology has water leakage sand holes after being used for a long time, if large spare parts are replaced, the purchase scheduled manufacturing time is longer, the investment cost is high, the production stop is caused, and the loss is larger.
The technical scheme for solving the technical problem of the invention is as follows:
the invention relates to a manual gas welding repair device for a large heat-resistant steel heating furnace door, wherein the furnace door is of a cuboid hollow structure and comprises a furnace door front panel and a furnace door rear panel, a plurality of fixing rods are uniformly arranged in the furnace door, and the device is characterized by further comprising a rectangular fixing bottom steel plate, a pressure test water inlet pipe and a pressure test water outlet pipe; a plurality of groups of vertical H-shaped steel supporting frames are symmetrically arranged on the left and right of the fixed bottom steel plate, and a horizontal H-shaped steel supporting frame with the height lower than that of the vertical H-shaped steel supporting frames is arranged between each group of vertical H-shaped steel supporting frames; the pressure test water inlet pipe and the pressure test water outlet pipe are respectively arranged on two sides in the furnace door, and one end pipe heads of the pressure test water inlet pipe and the pressure test water outlet pipe are arranged upwards.
As a further improvement of the technical scheme of the invention, the vertical H-shaped steel support frames are divided into two groups.
As a further improvement of the technical scheme of the invention, the vertical H-shaped steel support frame, the horizontal H-shaped steel support frame and the fixed bottom steel plate are fixed by welding.
As a further improvement of the technical scheme of the invention, triangular reinforcing rib plates are respectively arranged at the corners where the vertical H-shaped steel support frame and the horizontal H-shaped steel support frame are connected.
Another technical solution to solve the technical problem of the present invention is as follows:
the invention relates to a manual gas welding repair process for a large heat-resistant steel heating furnace door, wherein a furnace door front panel and a furnace door rear panel of the furnace door are provided with water leakage sand holes, and the manual gas welding repair device for the large heat-resistant steel heating furnace door in the technical scheme is used for repairing the water leakage sand holes on the furnace door front panel and the furnace door rear panel, and comprises the following specific steps:
step one, manufacturing a manual gas welding repair device; determining the specifications of a fixed bottom steel plate, a vertical H-shaped steel support frame and a horizontal H-shaped steel support frame in the manual gas welding repair device according to the specification of a furnace door, cutting and manufacturing, then lofting and sequencing the vertical H-shaped steel support frames on the fixed bottom steel plate, welding and fixing, welding and arranging the horizontal H-shaped steel support frame between each group of vertical H-shaped steel support frames, welding and arranging triangular reinforcing rib plates at corners between the vertical H-shaped steel support frames and the horizontal H-shaped steel support frames, and finally welding a pressure test water inlet pipe and a pressure test water outlet pipe in the furnace door;
step two, preparing and implementing a welding process; the welding process comprises pre-welding preparation, welding repair and post-welding hydrostatic test respectively;
2.1) preparing welding;
2.1.1), gas welding equipment: h01-12 welding gun, 1#/2# welding nozzle, throat hoop, oxyacetylene bottle and oxyacetylene wind belt;
2.1.2), welding technical requirements: the overlaying layer fuses base materials, and a welding seam cannot have any welding defects;
2.1.3), material: heat-resistant steel;
2.1.4), welding material: 0Cr18Ni9 Ti;
2.1.5), auxiliary facilities: magnifying glasses, wire brushes, sand paper, movable spanners, straight grinders, angle grinders, wire pliers, hacksaw blades, labor protection articles and the like;
2.1.6) determining welding process parameters according to welding requirements;
2.2) welding and repairing;
vertically and vertically placing the furnace door on a horizontal H-shaped steel support frame, and then welding and repairing front and rear panels of the furnace door; when welding and repairing, firstly, an angle grinder or a steel wire brush is adopted to clean and expand the to-be-welded and repaired part of the sand eye, then the bottom layer is welded, manual gas welding carbonization flame is adopted to expand the range outwards by taking the sand eye as the center, a welding gun nozzle and a vertically arranged furnace door form a horizontal included angle matched with a 0Cr18Ni9Ti stainless steel welding wire, and the welding wire is surfacing-welded to the sand eye from the outer circle to the circle, after one layer of welding is finished, the welding gun can be directly watched, and a 5-time magnifier can be adopted to detect whether welding defects such as air holes, cracks, incomplete fusion and the like exist on the welded surface, if the welding defects are found, the manual angle grinder is adopted to clean and; after confirming that the welding of the bottom layer is free of defects, filling and welding of the cover surface layer are carried out, welding of more than two layers is carried out by adopting a circle of welding from a sand hole to the outside, the integral height of the surfacing layer is slightly higher than the thickness of the furnace door base metal, and after the integral welding line is checked and confirmed to be free of welding defects, the welding repair process is completed;
2.3) carrying out a post-welding hydrostatic test; and (3) switching on the pressure test water inlet pipe to carry out water introduction and pressure test, assembling a pressure gauge on the pressure test water outlet pipe, and delivering for use after the hydraulic test is successful by observing the pressure gauge.
As a further improvement of the technical scheme of the invention, the priming layer adopts a 0Cr18Ni9Ti stainless steel welding wire with the diameter of 2.5mm, the gas flame is carbonization flame, the welding tip is a No. 1 welding tip, and the welding speed is 10 cm/min; the gas flame of the 0Cr18Ni9Ti stainless steel welding wire with the filling and covering layer diameter of 3.2mm is carbonization flame, the welding tip is a No. 2 welding tip, and the welding speed is 10 cm/min.
As a further improvement of the technical scheme of the invention, during welding repair, the water leakage sand holes on the front panel and the rear panel of the furnace door are synchronously welded and repaired.
Compared with the prior art, the manual gas welding repair device for the large heat-resistant steel heating furnace door is matched with the repair process, so that the manual gas welding repair device is safe and easy to operate, stable in welding quality, low in investment cost, capable of meeting actual field requirements, high in working efficiency, capable of greatly reducing maintenance cost, capable of reducing shutdown loss of the heating annular furnace and capable of guaranteeing reasonable assembly of wheels of various specifications and ring heating steel ingots.
Drawings
FIG. 1 is a schematic structural diagram of the front side of a manual gas welding repair device for a large heat-resistant steel heating furnace door;
FIG. 2 is a schematic side structure view of a manual gas welding repair device for a large heat-resistant steel heating furnace door according to the present invention;
in the figure: 1. the furnace door comprises a fixed bottom steel plate 2, a vertical H-shaped steel support frame 3, a horizontal H-shaped steel support frame 4, a triangular reinforcing rib plate 5, a pressure test water inlet pipe 6, a pressure test water outlet pipe 7, a fixed rod 8, a furnace door 9, a furnace door front panel 10 and a furnace door rear panel.
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", 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 a described object is changed, the relative positional relationships are changed accordingly; the terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
Example 1:
as shown in fig. 1 and 2, the furnace door 8 of the large heat-resistant steel heating furnace door manual gas welding repair device has a cuboid hollow structure and comprises a furnace door front panel 9 and a furnace door rear panel 10, and a plurality of fixing rods 7 are uniformly arranged in the furnace door 8; two groups of vertical H-shaped steel support frames 2 are symmetrically arranged on the fixed bottom steel plate 1 in the left-right direction, a horizontal H-shaped steel support frame 3 with the height lower than that of each vertical H-shaped steel support frame 2 is arranged between every two groups of vertical H-shaped steel support frames 2, and the distance between the two groups of vertical H-shaped steel support frames 2 is smaller than the length of the bottom of the furnace door 8, so that when the furnace door 8 is placed on the two horizontal H-shaped steel support frames 3, the furnace door 8 can be ensured to be just vertically placed on the horizontal H-shaped steel support frames 3, and the horizontal H-shaped steel support frames 3 are lower than the vertical H-shaped steel support frames 2 in height, so that the situation that the furnace door 8 does; the pressure test water inlet pipe 5 and the pressure test water outlet pipe 6 are respectively arranged on two sides in the furnace door 8, and one end pipe heads of the pressure test water inlet pipe 5 and the pressure test water outlet pipe 6 are arranged upwards.
In this embodiment, the vertical H-shaped steel support frame 2, the horizontal H-shaped steel support frame 3, and the fixed bottom steel plate 1 are fixed by welding.
In this embodiment, the corner that vertical H shaped steel support frame 2 and horizontal H shaped steel support frame 3 are connected is provided with triangle-shaped deep floor 4 respectively, in order to ensure this steadiness when manual gas welding prosthetic devices uses.
Example 2:
the invention relates to a manual gas welding repair process for a large heat-resistant steel heating furnace door, wherein water leakage sand holes appear on a furnace door front panel 9 and a furnace door rear panel 10 of a furnace door 8 after the furnace door is used for a long time, the embodiment repairs the water leakage sand holes on the furnace door front panel 9 and the furnace door rear panel 10 by using the manual gas welding repair device for the large heat-resistant steel heating furnace door described in embodiment 1, and the specific steps are as follows:
step one, manufacturing a manual gas welding repair device; the specifications of a fixed bottom steel plate 1, a vertical H-shaped steel support frame 2 and a horizontal H-shaped steel support frame 3 in the manual gas welding repair device are determined according to the specification of a furnace door 8 and are cut and manufactured, then all groups of vertical H-shaped steel support frames 2 are laid out and sequenced on the fixed bottom steel plate 1 and are welded and fixed, the horizontal H-shaped steel support frame 3 is welded and arranged between each group of vertical H-shaped steel support frames 2, a triangular reinforcing rib plate 4 is welded and arranged at a corner between the vertical H-shaped steel support frame 2 and the horizontal H-shaped steel support frame 3, and finally a pressure test water inlet pipe 5 and a pressure test water outlet pipe 6 are welded in the furnace door;
step two, preparing and implementing a welding process; the welding process comprises pre-welding preparation, welding repair and post-welding hydrostatic test respectively;
2.1, preparing welding;
2.1.1, gas welding equipment: h01-12 welding gun, 1#/2# welding nozzle, throat hoop, oxyacetylene bottle and oxyacetylene wind belt;
2.1.2, welding technical requirements: the overlaying layer fuses base materials, and a welding seam cannot have any welding defects;
2.1.3, material: heat-resistant steel;
2.1.4, welding material: 0Cr18Ni9Ti stainless steel wire;
2.1.5, auxiliary facilities: magnifying glasses, wire brushes, sand paper, movable wrenches, straight grinders, angle grinders, wire pliers, hacksaw blades, labor protection articles (work clothes, gloves, shoes, hats, planoscopes), etc.;
2.1.6, determining welding process parameters according to welding requirements;
manual shielded metal arc welding
2.2 welding and repairing;
considering that the front and rear panels 9 and 10 of the furnace door 8 of the large heat-resistant steel heating furnace are provided with partial water leakage sand holes, the furnace door 8 is vertically placed on the horizontal H-shaped steel support frame 3, and then the front and rear panels 9 and 10 of the furnace door 8 are welded and repaired, so that the sand holes on the front and rear panels 9 and 10 of the furnace door can be conveniently welded and repaired, and whether the leaked sand holes exist in the furnace door 8 of the whole large heat-resistant steel heating furnace can be comprehensively checked when a hydraulic test is carried out after the welding and repairing are finished; when welding and repairing, an angle grinder or a steel wire brush is adopted to clean and expand the part to be welded and repaired of the sand hole, the sand hole is weakest, the thickness of the panel is expanded outwards by taking the sand hole as a center and becomes thicker and thicker, then welding the bottom layer, in order to prevent the front and rear panels of the furnace door of the large heat-resistant steel heating furnace from being burnt through and well fused with the metallurgical combination of welding materials and base metals through welding again, adopting manual gas welding carbonization flame to expand outwards with the sand hole as the center, forming a horizontal included angle between a welding gun nozzle and the vertical vertically placed furnace door 8 and matching with 0Cr18Ni9Ti stainless steel welding wires, overlaying the welding wire from one circle to the sand hole, after one layer of welding is finished, the welding defect of air holes, cracks, incomplete fusion and the like on the welded surface can be directly observed or detected by adopting a 5-time magnifier, and if the welding defect is found, a manual angle grinder is adopted to clean and repair welding in time; after confirming that the welding of the bottom layer is free from defects, filling and welding of the cover surface layer are carried out, the welding of more than two layers is carried out by adopting a circle of welding from a sand hole to the outside, the integral height of the overlaying layer is slightly higher than the thickness of a parent metal of the furnace door 8, not only enough strength is ensured, but also long-time corrosion resistance is kept, after the integral welding line is checked and confirmed to be free from welding defects, surface cleaning and processing are not needed, the use of the furnace door of a large heat-resistant steel heating furnace for heating steel ingots and the matching precision installation of other assemblies of the annular furnace are ensured not to be influenced, and the welding repair process;
2.3, performing a post-welding hydrostatic test; and (3) switching on a pressure test water inlet pipe 5 to carry out water introduction and pressure test, assembling a pressure gauge on a pressure test water outlet pipe 6, observing the pressure gauge, and delivering for use after the hydraulic test is successful.
In this embodiment, during welding repair, the water leakage holes on the front and rear panels 9 and 10 of the furnace door 8 are welded and repaired synchronously, so that the furnace door 8 of the integral large heat-resistant steel heating furnace can be ensured not to deform due to other structural members caused by expansion with heat and contraction with cold.
Claims (7)
1. A manual gas welding repair device for a large heat-resistant steel heating furnace door is characterized by further comprising a rectangular fixed bottom steel plate (1), a pressure test water inlet pipe (5) and a pressure test water outlet pipe (6), wherein the furnace door (8) is of a cuboid hollow structure and comprises a furnace door front panel (9) and a furnace door rear panel (10), and a plurality of fixing rods (7) are uniformly arranged in the furnace door; a plurality of groups of vertical H-shaped steel supporting frames (2) are symmetrically arranged on the left and right of the fixed bottom steel plate (1), and a horizontal H-shaped steel supporting frame (3) with the height lower than that of the vertical H-shaped steel supporting frames (2) is arranged between each group of vertical H-shaped steel supporting frames (2); the pressure test water inlet pipe (5) and the pressure test water outlet pipe (6) are respectively arranged on two sides in the furnace door (8), and one end pipe head of the pressure test water inlet pipe (5) and one end pipe head of the pressure test water outlet pipe (6) are arranged upwards.
2. The manual gas welding repair device for the large heat-resistant steel heating furnace door according to claim 1, wherein the vertical H-shaped steel support frames (2) are divided into two groups.
3. The manual gas welding repair device for the large heat-resistant steel heating furnace door according to claim 1, wherein the vertical H-shaped steel support frame (2), the horizontal H-shaped steel support frame (3) and the fixed bottom steel plate (1) are fixed through welding.
4. The manual gas welding repair device for the large heat-resistant steel heating furnace door according to claim 1, wherein triangular reinforcing rib plates (4) are respectively arranged at corners where the vertical H-shaped steel support frame (2) and the horizontal H-shaped steel support frame (3) are connected.
5. A manual gas welding repair process for a large heat-resistant steel heating furnace door, wherein water leakage sand holes are formed in a furnace door front panel (9) and a furnace door rear panel (10) of a furnace door (8), and is characterized in that the manual gas welding repair device for the large heat-resistant steel heating furnace door, disclosed by claims 1-4, is used for repairing the water leakage sand holes in the furnace door front panel (9) and the furnace door rear panel (10), and comprises the following specific steps:
step one, manufacturing a manual gas welding repair device; the specifications of a fixed bottom steel plate (1), vertical H-shaped steel support frames (2) and horizontal H-shaped steel support frames (3) in the manual gas welding repair device are determined according to the specification of a furnace door (8) and are cut and manufactured, then all groups of vertical H-shaped steel support frames (2) are laid out and sorted on the fixed bottom steel plate (1) and are welded and fixed, the horizontal H-shaped steel support frames (3) are welded between every group of vertical H-shaped steel support frames (2), triangular reinforcing rib plates (4) are welded at corners between the vertical H-shaped steel support frames (2) and the horizontal H-shaped steel support frames (3), and finally a pressure test water inlet pipe (5) and a pressure test water outlet pipe (6) are welded in the furnace door;
step two, preparing and implementing a welding process; the welding process comprises pre-welding preparation, welding repair and post-welding hydrostatic test respectively;
2.1) preparing welding;
2.1.1), gas welding equipment: h01-12 welding gun, 1#/2# welding nozzle, throat hoop, oxyacetylene bottle and oxyacetylene wind belt;
2.1.2), welding technical requirements: the overlaying layer fuses base materials, and a welding seam cannot have any welding defects;
2.1.3), material: heat-resistant steel;
2.1.4), welding material: 0Cr18Ni9 Ti;
2.1.5), auxiliary facilities: magnifying glasses, wire brushes, sand paper, movable spanners, straight grinders, angle grinders, wire pliers, hacksaw blades, labor protection articles and the like;
2.1.6) determining welding process parameters according to welding requirements;
2.2) welding and repairing;
vertically and vertically placing the furnace door (8) on the horizontal H-shaped steel support frame (3), and then welding and repairing front and rear panels (9 and 10) of the furnace door (8); when welding repair is carried out, firstly, an angle grinder or a steel wire brush is adopted to clean and expand the to-be-welded part of the sand eye, then the welding of a bottom layer is carried out, manual gas welding carbonization flame is adopted to outwards expand a large range by taking the sand eye as the center, a welding gun nozzle and a vertical furnace door (8) form a horizontal included angle matched with a 0Cr18Ni9Ti stainless steel welding wire, and the welding gun nozzle and the vertical furnace door form a circle of horizontal included angle to build up the welding wire from the outer circle to the sand eye, after one layer of welding is finished, whether the welding surface has welding defects such as air holes, cracks, incomplete fusion and the like can be directly observed or detected by adopting a 5-time magnifier, if the welding defects are found; after confirming that the welding of the bottom layer is free of defects, filling and welding of the cover surface layer are carried out, welding of more than two layers is carried out by adopting a circle of welding from a sand hole to the outside, the integral height of the overlaying layer is slightly higher than the thickness of a base material of the furnace door (8), and after the integral welding seam is checked and confirmed to be free of welding defects, the welding repair process is completed;
2.3) carrying out a post-welding hydrostatic test; and (3) switching on the pressure test water inlet pipe (5) to carry out water and pressure test, assembling a pressure gauge on the pressure test water outlet pipe (6), and delivering for use after the hydraulic test is successful by observing the pressure gauge.
6. The manual gas welding repair process for the furnace door of the large heat-resistant steel heating furnace according to claim 5, wherein the priming layer is made of 0Cr18Ni9Ti stainless steel welding wire with the diameter of 2.5mm, the gas flame is carbonization flame, the welding nozzle is a No. 1 welding nozzle, and the welding speed is 10 cm/min; the gas flame of the 0Cr18Ni9Ti stainless steel welding wire with the filling and covering layer diameter of 3.2mm is carbonization flame, the welding tip is a No. 2 welding tip, and the welding speed is 10 cm/min.
7. The manual gas welding repair process for the furnace door of the large heat-resistant steel heating furnace according to claim 5, wherein during welding repair, the water leakage sand holes on the front and rear panels (9 and 10) of the furnace door (8) are synchronously welded and repaired.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114309880A (en) * | 2022-01-28 | 2022-04-12 | 安徽马钢设备检修有限公司 | Welding repair process for surface wear part of upright post hole of lower cross beam of large hydraulic press |
| CN115383248A (en) * | 2022-10-25 | 2022-11-25 | 长沙英平机械制造有限责任公司 | Roller kiln furnace body welding device |
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| CN211991342U (en) * | 2020-04-28 | 2020-11-24 | 安徽马钢设备检修有限公司 | Manual gas welding repair device for large heat-resistant steel heating furnace door |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114309880A (en) * | 2022-01-28 | 2022-04-12 | 安徽马钢设备检修有限公司 | Welding repair process for surface wear part of upright post hole of lower cross beam of large hydraulic press |
| CN115383248A (en) * | 2022-10-25 | 2022-11-25 | 长沙英平机械制造有限责任公司 | Roller kiln furnace body welding device |
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