CN120002127A - A simple welding device and repair method for wear on the end of an oxygen gun water cooling box - Google Patents

Abstract

The invention discloses a simple welding device and a repairing method for the abrasion of the end part of an oxygen lance water cooling box, wherein the oxygen lance water cooling box comprises a circular chassis connecting seat with a hollow inside, a cold water inlet pipe and a hot water outlet pipe are communicated with the bottom of the circular chassis connecting seat, a plurality of red copper hollow guard plates are uniformly and vertically communicated with the top of the circular chassis connecting seat at intervals along the circumference, the inner sides of the tops of the red copper hollow guard plates are fixedly connected through guard plate connecting fixing rings, the simple welding device comprises a hook-shaped base supporting structural part and a base fixing plate obliquely arranged at the top of the base supporting structural part, cold water inlet pipe holes and hot water outlet pipe holes corresponding to the positions of the cold water inlet pipe and the hot water outlet pipe of the oxygen lance water cooling box are formed in the base fixing plate, and the oxygen lance water cooling box is respectively inserted into the cold water inlet pipe holes and the hot water outlet pipe holes to be fixed on the base fixing plate, and the red copper hollow guard plates are in a vertical state. The invention can effectively solve the problem of welding repair of the abrasion of the end part of the existing oxygen lance water cooling box.

Description

Simple welding device and repairing method for end abrasion of oxygen lance water cooling box

Technical Field

The invention belongs to the technical field of welding, and particularly relates to a simple welding device for end abrasion of an oxygen lance water cooling box and a repairing method.

Background

The oxygen gun of the steelmaking electric furnace is a key device in the electric furnace steelmaking process and is mainly used for blowing oxygen into a molten pool so as to accelerate chemical reaction and improve smelting efficiency. In daily work, the electric furnace oxygen lance is arranged in the red copper body oxygen lance water-cooling box for oxygen blowing, and the oxygen lance water-cooling box is directly inserted into the furnace chamber of the electric furnace. The structure of oxygen rifle water-cooling box is as shown in figure 3, and it includes inside hollow circular chassis connecting seat 2, circular chassis connecting seat 2 bottom intercommunication is provided with cold inlet tube 3 and hot outlet pipe 6, and the top is provided with a plurality of red copper hollow backplate 4 along the even interval vertical intercommunication of circumference, each the inboard of top of red copper hollow backplate 4 is connected fixedly through backplate connection solid ring 7, and the oxygen rifle sets up in the circular inboard that red copper hollow backplate 4 encloses, during operation, sends into cooling water through cold inlet tube 3 through circular chassis connecting seat 2 to each red copper hollow backplate 4, discharges through hot outlet pipe 6 again. The oxygen lance water-cooling box is hollow and has circulating hot and cold water to continuously cool down, but the end part is solid, so that end part abrasion is usually caused, and the oxygen lance water-cooling box mainly comprises (1) high-temperature oxidation and thermal fatigue, which cause high-temperature oxidation and thermal fatigue of water-cooling box materials in the smelting process, so that abrasion is caused, (2) material flushing, which is caused by high-speed material particles generated in the smelting process, on the surface of the water-cooling box, so that the surface of the water-cooling box is gradually abraded, (3) cooling water quality, which is caused by the fact that impurities or bad water quality in cooling water possibly corrodes the water-cooling box, so that abrasion is aggravated, and (4) design and manufacturing defects, which are caused by the fact that the water-cooling box is easier to abrade in the use process, are caused by unreasonable design or defect in the manufacturing process, are overcome, and (5) incorrect operation, such as incorrect control of the position of the oxygen lance, which causes the oxygen lance to be too low, so that the water-cooling box is directly exposed in a high-temperature molten pool, so that abrasion is accelerated, and mechanical damage is caused by collision of the oxygen lance or other equipment and the water-cooling box in the operation process, so that mechanical damage is possibly caused. If the end part of the oxygen lance water cooling box is severely worn, the hollow oxygen lance water cooling box can be directly leaked, and serious safety accidents and steelmaking quality are generated. Therefore, the hollow oxygen lance water cooling box which is easy to wear needs to be frequently replaced. The problems are that because the oxygen lance water cooling box is an easy-to-wear part, if the oxygen lance water cooling box is continuously replaced for a long time, a large amount of purchasing cost is wasted, and the precision installation matched with other original assemblies is affected by new parts replaced for many times, and various substandard performances are generated.

Disclosure of Invention

Aiming at the technical problems in the background technology, the invention provides a simple welding device and a repairing method for the abrasion of the end part of the oxygen lance water-cooling box, and the welding repairing problem of the abrasion of the end part of the oxygen lance water-cooling box is effectively solved.

The technical scheme for solving the technical problems is as follows:

According to one aspect of the invention, a simple welding device for abrasion of the end part of an oxygen lance water cooling box is provided, the oxygen lance water cooling box comprises a circular chassis connecting seat with a hollow inside, a cold water inlet pipe and a hot water outlet pipe are communicated with the bottom of the circular chassis connecting seat, a plurality of red copper hollow guard plates are vertically communicated with the top of the circular chassis connecting seat at uniform intervals along the circumference, the inner sides of the tops of the red copper hollow guard plates are fixedly connected through guard plate connecting fixing rings, the simple welding device comprises a hook-shaped base supporting structural member and a base fixing plate obliquely arranged at the top of the base supporting structural member, cold water inlet pipe holes and hot water outlet pipe holes corresponding to the positions of the cold water inlet pipe and the hot water outlet pipe of the oxygen lance water cooling box are formed in the base fixing plate, and the oxygen lance water cooling box is respectively inserted into the cold water inlet pipe holes and the hot water outlet pipe holes to be fixed on the base fixing plate, and the red copper hollow guard plates are in a vertical state.

Further, the top of two sides of the base supporting structural member is respectively provided with an upper inclined plate and a lower inclined plate with the same angle in an inclined way, and the upper end and the lower end of the base fixing plate are respectively provided with bolt holes corresponding to the upper inclined plate and the lower inclined plate and can be detachably fixed through fixing bolts.

Further, the base support structural member is formed by cutting, processing and welding a steel plate with the thickness of 20mm, and the base fixing plate is formed by cutting, processing and machining a steel plate with the thickness of 50 mm.

Further, the fixing bolt is formed by machining a round bar with the diameter of 25mm, and the upper inclined plate and the lower inclined plate are formed by cutting and machining steel plates with the thickness of 20mm respectively.

According to another aspect of the present invention, there is provided a repair method for end wear of an oxygen lance water-cooling box, by the above technical scheme, the simple welding device for end wear of an oxygen lance water-cooling box is used to insert the oxygen lance water-cooling box into a cold water inlet pipe and a hot water outlet pipe respectively, and fix the oxygen lance water-cooling box onto a base fixing plate through the cold water inlet pipe hole and the hot water outlet pipe hole, so that each red copper hollow guard plate is in a vertical state, the repair method is as follows:

S1, preparing before welding:

1.1 Welding equipment, manual carbon dioxide gas shielded welder, welding material, HS201 welding wire and phi 1.2mm;

1.2 Groove size, namely preparing a U-shaped groove with a backing plate at the wearing position;

1.3 Heating appliance, oxygen acetylene;

1.4 A weldment material, namely red copper T1;

1.5 A welding position, namely plane surfacing;

1.6 Auxiliary facilities including templates, magnifier, face mask, glove, slag removing hammer, chisel, file, wire brush, sand paper, steel ruler, level bar, movable wrench, straight grinder, angle grinder, wire pliers, steel saw blade and labor protection articles;

1.7 The welding groove and the surface of the welding wire are not required to have greasy dirt, an oxide layer and moisture;

1.8 Welding technical requirements that a welding seam overlaying layer fuses a base metal, and a welding seam has no welding defect and meets the design size;

1.9 Setting welding parameters according to welding equipment, welding materials and welding requirements;

S2, welding;

The method comprises the steps of cleaning the tops of all red copper hollow guard plates by adopting an angle grinder to expose metallic luster, performing build-up welding one by one, preheating by adopting oxygen-acetylene when the ends of the first red copper hollow guard plates are welded to ensure that the surface temperature is controlled to be 650-750 ℃, then performing carbon dioxide gas protection bottom layer welding, performing a linear wire conveying method, performing multi-pass welding, hammering the welding seam to eliminate stress after the bottom layer welding is finished, performing filling layer build-up welding after no welding defect is confirmed by adopting visual inspection or detection of a 10-time magnifying glass, measuring the interlayer temperature before the filling layer welding to ensure that the temperature is not lower than a preheating temperature range, controlling the thickness of each welding seam of the filling layer to be about 10mm, performing stress elimination after each welding seam is finished, performing visual inspection or detection of a 10-time magnifying glass, controlling the interlayer temperature, hammering the welding seam and detecting the surface, performing flaw detection after the welding seam is cooled to room temperature, performing manual grinding after the cover layer welding, repairing the welding ends of other red copper hollow guard plates in a mode, and delivering the welding repair after the final detection is qualified, and using.

Further, the welding equipment is a manual carbon dioxide gas shielded welding machine with loosening YD-350FR 2.

Further, during welding of the bottom layer, the welding current is 180-220A, the arc voltage is 25+/-1V, the welding speed is 25+/-1 cm.min < -1 >, and during welding of the filling layer and the cover layer, the welding current is 240-260A, the arc voltage is 26+/-1V, and the welding speed is 25+/-1 cm.min < -1 >.

Further, when preheating is carried out by using oxygen-acetylene, the temperature is measured by using a temperature measuring gun, so that the temperature is ensured to be 50mm in thickness by penetrating the surface layer.

Compared with the prior art, the simple welding device for the abrasion of the end part of the oxygen lance water-cooling box and the repairing method thereof have the advantages that the simple welding device is safe and easy to operate, the investment cost is low, the field actual demand is met, the working efficiency is high, the maintenance cost is greatly reduced, convenience is provided for repairing the end part of the oxygen lance water-cooling box, and the orderly production is effectively ensured.

Drawings

FIG. 1 is a schematic diagram of a simple welding device according to the present invention;

FIG. 2 is a schematic structural view of a simple welding device according to the present invention;

FIG. 3 is a schematic view of the structure of the oxygen lance water cooling box according to the present invention;

In the figure, a base fixing plate, a round base connecting seat, a cold water inlet pipe, a 4-red copper hollow guard plate, a base supporting structural member, a 51, an upper inclined plate, a 52, a lower inclined plate, a 53, a cold water inlet pipe hole, a 54, a hot water outlet pipe hole, a 55, a fixing bolt, a 6, a hot water outlet pipe and a 7-guard plate are connected with a fixing ring.

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 of the present disclosure and the claims, the terms "upper," "lower," "left," "right," "front," "rear," and the like are used merely to refer to a relative positional relationship that changes when the absolute position of an object being described changes, and terms such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The present invention is not described in detail in the present application, and is well known to those skilled in the art.

Example 1:

As shown in fig. 1-3, the oxygen lance water cooling box comprises a circular chassis connecting seat 2 with hollow inside, a cold water inlet pipe 3 and a hot water outlet pipe 6 are communicated with the bottom of the circular chassis connecting seat 2, a plurality of red copper hollow guard plates 4 are vertically communicated with the top of the circular chassis connecting seat along the circumference at uniform intervals, and the inner sides of the tops of the red copper hollow guard plates 4 are fixedly connected through guard plate connecting fixing rings 7. The invention provides a simple welding device for the end abrasion of an oxygen lance water-cooling box, which comprises a hook-shaped base supporting structural member 5 and a base fixing plate 1 obliquely arranged at the top of the base supporting structural member 5, wherein a cold water inlet pipe hole 53 and a hot water outlet pipe hole 54 corresponding to the positions of a cold water inlet pipe 3 and a hot water outlet pipe 6 of the oxygen lance water-cooling box are formed in the base fixing plate 1, and when the simple welding device is applied, the oxygen lance water-cooling box can be fixed on the base fixing plate 1 by respectively inserting the cold water inlet pipe 3 and the hot water outlet pipe 6 into the cold water inlet pipe hole 53 and the hot water outlet pipe hole 54, and all red copper hollow guard plates 4 are in a vertical state. In this embodiment, the inclination angle of the connection line at two ends of the hook-shaped base support structural member 5 is determined according to the angles of the cold water inlet pipe 3 and the hot water outlet pipe 6 on the oxygen lance water cooling box and the circular chassis connecting seat 2, that is, after the oxygen lance water cooling box is placed on the base fixing plate 1, the red copper hollow guard plates 4 are in a vertical state.

In order to facilitate the installation of the base fixing plate 1 on the base supporting structural member 5, as a preferred embodiment, the top parts of two sides of the base supporting structural member 5 are respectively provided with an upper inclined plate 51 and a lower inclined plate 52 which are in consistent angles in an inclined manner, and the upper and lower ends of the base fixing plate 1 are respectively provided with bolt holes corresponding to the upper inclined plate 51 and the lower inclined plate 52 and are detachably fixed through fixing bolts 55.

As a preferred embodiment, the base support structure 5 is formed by cutting and welding a 20mm thick steel plate, the base fixing plate 1 is formed by cutting and machining a 50mm thick steel plate, the fixing bolt 55 is formed by cutting and machining a 25mm diameter round bar, and the upper inclined plate 51 and the lower inclined plate 52 are formed by cutting and machining a 20mm thick steel plate, respectively.

Example 2:

The invention provides a repair method for the abrasion of the end part of an oxygen lance water-cooling box, which is carried out by a simple welding device for the abrasion of the end part of the oxygen lance water-cooling box in the embodiment 1, wherein the oxygen lance water-cooling box is respectively inserted into a cold water inlet pipe hole 53 and a hot water outlet pipe hole 54 through a cold water inlet pipe 3 and a hot water outlet pipe 6 to be fixed on a base fixing plate 1, so that each red copper hollow guard plate 4 is in a vertical state, and the repair method comprises the following steps:

S1, preparing before welding:

1.1, welding equipment, a manual carbon dioxide gas shielded welder with loosening YD-350FR2, wherein the welding material is HS201 welding wire with phi of 1.2mm;

1.2, groove size, namely preparing a U-shaped groove with a backing plate at the abrasion position;

1.3, heating appliance, oxygen-acetylene;

1.4, a weldment material is red copper T1;

1.5, surfacing welding at the welding position;

1.6, auxiliary facilities including templates, magnifier, face mask, glove, slag removing hammer, chisel, file, steel wire brush, sand paper, steel ruler, level bar, movable wrench, straight grinder, angle grinder, wire pliers, hacksaw blade and labor protection article;

1.7, the requirements before welding are that the welding groove and the surface of the welding wire cannot have greasy dirt, an oxidation layer and moisture, and acetone and sand paper are adopted to remove rust, grease and moisture on the welding groove and the surface of the welding wire;

1.8, welding technical requirements that a welding seam overlaying layer fuses a base metal, and a welding seam has no welding defect and meets the design size;

1.9, setting welding process parameters according to welding equipment, welding materials and welding requirements;

Welding process parameters

Welding wire model	Welding layer	Wire diameter/mm	Welding current A	Arc voltage/v	Welding speed/(cm' min-1)
						HS201	Priming layer	1.2	180-220	25±1	25±1
HS201	Filling cover layer	1.2	240-260	26±1	25±1

S2, welding:

The welding process comprises the steps of placing a wear surface at a flat welding position, cleaning the surface by adopting an angle grinder to expose metallic luster, preheating by oxygen-acetylene at 650-750 ℃, performing carbon dioxide gas protection under-layer overlaying, detecting surface defects, maintaining interlayer temperature, performing filling layer overlaying, hammering a welding line by a flat hammer, performing layer-by-layer defect detection, performing overlaying layer overlaying to be higher than that of the original base metal, performing slow cooling, processing, detecting and delivering.

The method comprises the steps of cleaning the tops of all red copper hollow guard plates 4 by adopting an angle grinder to expose metallic luster, performing overlaying welding one by one, preheating by adopting oxygen-acetylene when the ends of the first red copper hollow guard plates 4 are welded, controlling the surface temperature to be 650-750 ℃, enabling the temperature to permeate into a surface layer to be 50mm, measuring by adopting a qualified temperature measuring gun, then performing carbon dioxide gas protection bottom welding, enabling the welding seam to be not too wide, adopting a linear wire conveying method, performing multi-channel welding, enabling high-temperature copper liquid to be not easy to absorb harmful gas, fusing the welding seam to a parent metal, hammering the welding seam to eliminate stress after the bottom welding is finished, detecting by adopting a visual inspection or a 10-time magnifying glass, confirming that no welding defect exists, performing filling layer overlaying welding, measuring the interlayer temperature by adopting the temperature measuring gun before filling layer welding, ensuring the temperature to be not lower than a preheating temperature interval, controlling the thickness of each layer to be about 10mm, enabling the welding seam to be hammered to eliminate stress after each layer welding is finished, detecting by adopting a qualified temperature measuring gun or a 10-time magnifying glass, controlling the interlayer temperature, enabling the welding seam to be not easy to be too wide, manually and detecting the welding seam, enabling the welding seam to be required to be welded, performing manual inspection and surface welding, carrying out repair welding, and repairing the welding seam after the welding seam to be larger than the room temperature is detected by the parent metal, and waiting for the temperature is cooled, and the original end is subjected to be detected, and subjected to the inspection, and the quality inspection of the parent metal is finished, and the welding plate is finished, and subjected to and the quality inspection and the welding.

Claims (8)

1. A simple welding device for the end of an oxygen lance water cooling box with wear, the oxygen lance water cooling box comprising a circular chassis connecting seat (2) with a hollow interior, a cold water inlet pipe (3) and a hot water outlet pipe (6) being connected at the bottom of the circular chassis connecting seat (2), and a plurality of hollow copper guard plates (4) being evenly spaced and vertically connected at the top along the circumference, the inner sides of the tops of the hollow copper guard plates (4) being connected and fixed by guard plate connection fixing rings (7), characterized in that the simple welding device comprises a hook-shaped base support structure (5) and an inclined arrangement A base fixing plate (1) is provided on the top of the base supporting structure (5), and the base fixing plate (1) is provided with a cold water inlet pipe hole (53) and a hot water outlet pipe hole (54) corresponding to the positions of the cold water inlet pipe (3) and the hot water outlet pipe (6) of the oxygen lance water cooling box; wherein: the oxygen lance water cooling box is fixed to the base fixing plate (1) by inserting the cold water inlet pipe (3) and the hot water outlet pipe (6) into the cold water inlet pipe hole (53) and the hot water outlet pipe hole (54) respectively, and each of the copper hollow guard plates (4) is in a vertical state. 2. A simple welding device for the end wear of an oxygen lance water-cooling box according to claim 1, characterized in that upper inclined plates (51) and lower inclined plates (52) with the same angle are respectively inclinedly arranged on the tops of both sides of the base support structure (5), and bolt holes are respectively opened at the upper and lower ends of the base fixing plate (1) corresponding to the upper inclined plate (51) and the lower inclined plate (52) and can be detachably fixed by fixing bolts (55). 3. A simple welding device for the end wear of an oxygen lance water-cooling box according to claim 1, characterized in that the base support structure (5) is formed by cutting, processing and welding a 20 mm thick steel plate, and the base fixing plate (1) is formed by cutting and machining a 50 mm thick steel plate. 4. A simple welding device for the end wear of an oxygen lance water-cooling box according to claim 2 or 3, characterized in that the fixing bolt (55) is machined from a round bar with a diameter of 25 mm, and the upper inclined plate (51) and the lower inclined plate (52) are respectively cut from a steel plate with a thickness of 20 mm. 5. A method for repairing the wear of an oxygen lance water cooling box end, characterized in that the method is performed by using the simple welding device for the wear of an oxygen lance water cooling box end according to any one of claims 1 to 4, the oxygen lance water cooling box is respectively inserted into the cold water inlet pipe hole (53) and the hot water outlet pipe hole (54) through the cold water inlet pipe (3) and the hot water outlet pipe (6) and fixed on the base fixing plate (1), so that each of the copper hollow guard plates (4) is in a vertical state, and the repair method is as follows: S1. Preparation before welding: 1.1) Welding equipment: manual carbon dioxide gas shielded welding machine; welding materials: HS201 welding wire, φ1.2mm; 1.2) Groove size: Prepare a U-shaped groove with a pad at the worn position; 1.3) Heating equipment: oxygen and acetylene; 1.4) Welding material: copper T1; 1.5) Welding position: flat surfacing; 1.6) Auxiliary facilities: template, magnifying glass, mask, gloves, slag hammer, hammer, chisel, file, wire brush, sandpaper, steel ruler, level, adjustable wrench, straight grinder, angle grinder, wire cutters, hacksaw blade, labor protection supplies; 1.7) Requirements before welding: There should be no oil, oxide layer or moisture on the welding groove and welding wire surface; 1.8) Welding technical requirements: The weld cladding layer fuses the parent material, the weld has no welding defects and meets the design dimensions; 1.9) Welding process parameters: Welding parameters are formulated according to welding equipment, welding materials and welding requirements; S2, welding implementation; The tops of all the hollow copper guard plates (4) are cleaned with an angle grinder to expose the metallic luster on the surface, and then the surfacing welding is performed one by one; when welding the end of the first hollow copper guard plate (4), oxygen·acetylene is used for preheating so that the surface temperature is controlled in the range of 650~750℃, and then the bottom layer welding is performed with carbon dioxide gas protection, and the straight wire feeding method is used to perform multi-pass welding. After the bottom layer welding is completed, the weld is hammered to eliminate stress, and after visual inspection or 10 times magnifying glass is used to confirm that there are no welding defects, the filling layer surfacing welding is performed; before the filling layer welding, the interlayer temperature is measured to confirm that The holding temperature is not lower than the preheating temperature range. The thickness of each weld of the filling layer is controlled to be about 10 mm. After each layer is welded, the weld is hammered to eliminate stress, and then visual inspection or a 10x magnifying glass is used to confirm that there are no defects. The interlayer temperature, hammering and surface welds of each layer must be controlled. When welding the cover layer, the weld is higher than the original parent material size. After the weld cools to room temperature, a flaw detection is carried out, and then manual grinding is performed. Then the ends of other copper hollow guard plates (4) are welded and repaired in the above manner, and after passing the final inspection, they are put into use. 6. The repair process according to claim 5 is characterized in that the welding equipment is a Panasonic YD-350FR2 manual carbon dioxide gas shielded welding machine. 7. The repair process according to claim 5 is characterized in that: when welding the base layer, the welding current is 180-220A, the arc voltage is 25±1V, and the welding speed is 25±1 cm·min ^-1 ; when welding the filling layer and the cover layer, the welding current is 240-260A, the arc voltage is 26±1V, and the welding speed is 25±1 cm·min ^-1 . 8. The repair process according to claim 5 is characterized in that when oxygen and acetylene are used for preheating, a temperature measuring gun is used to measure to ensure that the temperature must penetrate the surface layer thickness of 50 mm.