Hastelloy surfacing device and method for gasification furnace cylinder

Abstract

The invention discloses a hastelloy surfacing device and method for a gasifier cylinder. The hastelloy surfacing device comprises a plurality of supporting frames arranged below the barrel, a roller assembly arranged above one end of each supporting frame, an annular rail connected to the inner wall of the barrel through a magnet, a trolley connected to the inner wall of the annular rail in a sliding mode, an oscillator connected to the trolley, a welding gun fixed to the oscillator and a control module arranged on the oscillator. The welding gun is matched with synchronous movement control of the trolley and the barrel, the welding efficiency is greatly improved, trolley walking and barrel rotation are independently controllable, meanwhile, parallel construction of multiple sets of devices installed in the barrel is supported, the construction rhythm can be flexibly adjusted according to the construction period requirement, and the surfacing construction period is effectively shortened; and in combination with precise regulation and control of the control module on welding parameters, the dilution effect of base metal on a welding seam can be reduced, the proportion of effective components of hastelloy in a surfacing layer is ensured, and the performance of hastelloy is fully exerted.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of gasifier cylinder, and particularly relates to a hard-facing device and method for hard-facing of a gasifier cylinder. BACKGROUND

[0002] In the coal gas production in the chemical industry, the gasifier as a core equipment needs to be operated under high temperature and high pressure for a long time, and at the same time, it needs to withstand the corrosion of corrosive medium and the scouring of high-speed material. The harsh environment can easily lead to overburning, corrosion and wear of the gasifier cylinder, resulting in wall thickness thinning and structural strength reduction, which not only affects the operation efficiency of the equipment, but also causes safety hazards such as cylinder cracking and medium leakage, seriously restricting the safe and stable long-period operation of the gasifier, and significantly affecting the continuity and economy of the coal gas production. In order to solve the above problems, the industry generally adopts hard-facing of nickel-based alloy to the inner wall of the gasifier for surface modification, and the hard-facing of hardy alloy becomes an ideal material due to its excellent corrosion resistance, high temperature resistance and wear resistance. The hard-facing of hardy alloy can effectively improve the resistance of the inner wall of the gasifier, delay damage, reduce the number of shutdown and maintenance, and prolong the operation time of the equipment, which is an economical and practical surface modification scheme, and is of great significance to the stable production of coal gas.

[0003] In the prior art, mainly welding rod arc welding, tungsten inert gas welding and other hard-facing methods are adopted, which have the following obvious deficiencies: first, the welding efficiency is low, which is difficult to meet the demand of large-area hard-facing of the inner surface of the cylinder, resulting in long construction period; second, the weld dilution rate is high, which reduces the performance of the hard-facing layer and cannot fully play the advantages of hardy alloy; third, it depends on manual operation, which is high in cost and poor in quality stability. Moreover, the cylinder is easy to move when rotating, which leads to poor lap joint of the welding bead, further affecting the hard-facing quality, and the existing process cannot be flexibly adjusted according to the construction period demand, which is difficult to shorten the construction period, and cannot meet the demand of enterprises to quickly repair the equipment and resume production. In view of the above, there is an urgent need for a hard-facing device and method for hard-facing of a gasifier cylinder. SUMMARY

[0004] In order to solve the above-mentioned technical problems in the prior art, the present application provides a hard-facing device and method for hard-facing of a gasifier cylinder.

[0005] In one aspect of the present application, a hard-facing device for hard-facing of a gasifier cylinder is provided, which comprises a plurality of support frames arranged below the cylinder, a roller assembly arranged above one end of the support frame, an annular track connected to the inner wall of the cylinder by a magnet, a trolley slidingly connected to the inner wall of the annular track, a swing connected to the trolley, a welding gun fixed on the swing, and a control module arranged on the swing, wherein: The trolley is internally provided with a first driving unit, the output shaft of the first driving unit is connected with a pulley matched with the annular track, the pulley is slidingly connected to the annular track, one side of the trolley is provided with a retainer, the retainer is fixedly connected with a rack, the wobbler is provided with an adjusting hole, the adjusting hole is slidingly connected to the circumferential surface of the rack, the wobbler is internally provided with a second driving unit connected to the rack. The control module is connected to the welding gun, the magnet is connected with a magnetic force adjusting switch, the roller assembly comprises a base fixed to the top of the support frame, a roller hinged to the base, and a third driving unit connected to the roller, and the circumferential surface of the roller is in contact with the circumferential surface of the cylinder.

[0006] Further, in the above-mentioned gasifier cylinder's hastelloy overlaying device, the number of support frames is 2-4, and the plurality of support frames are uniformly distributed along the axial direction of the cylinder.

[0007] Further, in the above-mentioned gasifier cylinder's hastelloy overlaying device, the circumferential surface of the roller is provided with an anti-skid layer.

[0008] Further, in the above-mentioned gasifier cylinder's hastelloy overlaying device, the welding gun is a gas shielded arc welding gun.

[0009] Further, in the above-mentioned gasifier cylinder's hastelloy overlaying device, the annular track comprises a plurality of arc-shaped tracks that are overlapped with each other.

[0010] In another aspect of the present application, a gasifier cylinder's hastelloy overlaying method is also provided, comprising: Step 1: leveling and aligning the support frame, placing the cylinder to be overlaid on the support frame, making the outer periphery of the cylinder abut against the circumferential surface of the roller, installing the annular track and the trolley in the cylinder, the annular track is attracted to the inner wall of the cylinder by operating the magnetic force adjusting switch, the wobbler is installed at the end of the rack, and the welding gun is fixed on the wobbler; Step 2: simultaneously starting the first driving unit and the third driving unit, rotating the cylinder counterclockwise, sliding the trolley downward along the annular track, adjusting the first driving unit and the third driving unit so that the rotation speed of the cylinder and the walking speed of the trolley are the same, at the same time, starting the welding gun, and closing the welding gun after the cylinder rotates one circle, completing the first layer of hastelloy overlaying, and correspondingly forming a first weld. Step 3: moving the swing arm along the rack by the second driving unit to a first preset distance in the direction of the surfacing, carrying out the second surfacing of the Inconel alloy, starting the welding gun, closing the welding gun after the cylinder rotates one circle, completing the second surfacing of the Inconel alloy, and ensuring that the second welding trace overlaps the first welding trace by a second preset distance; Step 4: repeating the above step 3 to sequentially complete the third and subsequent surfacing of the cylinder until the swing arm moves to the limit position close to the retainer, then moving the ring track to the surfacing direction by a third preset distance through the operation of the magnetic adjustment switch, and then returning the swing arm to the initial position through the second driving unit, repeating the above steps 2-3 until the surfacing of the inner wall of the cylinder is completed.

[0011] Further, in the above-mentioned Inconel alloy surfacing method of the gasifier cylinder, when two or more layers of Inconel alloy need to be surfaced in the cylinder, after step 4: repeating the above step 3 to sequentially complete the third and subsequent surfacing of the cylinder until the swing arm moves to the limit position close to the retainer, then returning the swing arm to the initial position through the second driving unit and adjusting the distance between the welding gun and the inner wall of the cylinder, starting the first surfacing of the second layer, and repeating the above steps 2-4 until the surfacing of two or more layers of Inconel alloy in the cylinder is completed.

[0012] Further, in the above-mentioned Inconel alloy surfacing method of the gasifier cylinder, when two or more layers of Inconel alloy need to be surfaced in the cylinder, the distance between the first welding trace of the previous layer and the first welding trace of the next layer needs to be staggered by half of the first welding trace.

[0013] Further, in the above-mentioned Inconel alloy surfacing method of the gasifier cylinder, the control module is used to adjust the swing mode, swing frequency and swing amplitude of the swing arm.

[0014] Further, in the above-mentioned Inconel alloy surfacing method of the gasifier cylinder, the first preset distance is 10-15mm, the second preset distance is 3-5mm, and the third preset distance is 350-450mm.

[0015] The Inconel alloy surfacing device and method of the gasifier cylinder have the following advantages and positive effects: (1) The synchronous motion control of the welding gun and the trolley with the cylinder greatly improves the welding efficiency, the trolley walking and the cylinder rotating are independently controllable, meanwhile, multiple sets of devices can be installed in the cylinder for parallel construction, the construction rhythm can be flexibly adjusted according to the construction period requirement, the surfacing period is effectively shortened, the dilution effect of the base material on the weld is reduced through the selection of the gas shielded welding gun and the precise control of the welding parameters by the control module, the effective component proportion of the hastelloy in the surfacing layer is ensured, and the performance of the hastelloy is fully utilized; (2) The anti-skid layer of the roller assembly can prevent the cylinder from rotating and moving, the synchronous speed control of the trolley and the cylinder and the welding bead lap distance control can avoid poor welding bead lap, the welding bead is arranged in error during layer surfacing, the compactness of the surfacing layer is further improved, the quality defects are reduced, the device is installed and disassembled through the magnetic attraction type of the annular track and the automatic position adjustment of the swing device, the surfacing operation process is simplified, the surfacing construction difficulty is reduced, the annular track formed by the arc-shaped tracks can be used for adapting to the gasification furnace cylinder with different inner diameters, the support frame quantity can be flexibly adjusted, and the device can be used for adapting to the cylinder with different lengths and weights, and has good applicability. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only for further understanding of the embodiments of the present application and constitute a part of the present application. Other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings. In the drawings: Fig. 1 is a structure schematic view of the hastelloy surfacing device of the gasification furnace cylinder of the present application; Fig. 2 is a local enlarged view of the hastelloy surfacing device of the gasification furnace cylinder of the present application; Fig. 3 is a structure schematic view of the second layer surfacing in the hastelloy surfacing device of the gasification furnace cylinder of the present application.

[0017] Explanation of reference signs: 1, cylinder; 11, first layer surfacing; 12, second layer surfacing; 2, support frame; 21, base; 22, roller; 3, retainer; 4, annular track; 5, magnet; 6, trolley; 7, rack; 8, swing device; 9, welding gun. DETAILED DESCRIPTION

[0018] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described below in connection with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0019] The present application provides a kind of gasification furnace cylinder's hardy alloy overlaying device and method, as shown in Figs. 1 to 3 The gasification furnace cylinder's hardy alloy overlaying device includes a plurality of support frames 2 arranged below the cylinder 1, a roller assembly arranged above one end of the support frame 2, an annular track 4 connected to the inner wall of the cylinder 1 by a magnet 5, a trolley 6 slidingly connected to the inner wall of the annular track 4, an oscillator 8 connected to the trolley 6, a welding torch 9 fixed to the oscillator 8, and a control module arranged on the oscillator 8. The support frame 2 is used to stably support the cylinder 1 to be overlaid, ensuring that the cylinder 1 maintains a predetermined posture during the overlaying process, thereby avoiding the influence of the overlaying precision caused by the inclination of the cylinder 1. More specifically, the relative sliding connection between the trolley and the annular track is achieved through the meshing cooperation of the rack and pinion, wherein: A first drive unit is arranged in the trolley 6, and the output shaft of the first drive unit is connected to a pulley matched with the annular track 4. The pulley is slidingly connected to the annular track 4 and slides along the annular track 4, thereby driving the trolley 6 to move along the annular track 4 and providing the welding torch with circumferential walking power. A retaining frame 3 is arranged on one side of the trolley 6, and the retaining frame 3 is fixedly connected to a rack 7. The oscillator 8 is provided with an adjusting hole, and the adjusting hole is slidingly connected to the peripheral surface of the rack 7, so that the oscillator 8 can move axially along the rack 7. A second drive unit connected to the rack 7 is arranged in the oscillator 8, and the second drive unit can drive the oscillator 8 to move along the rack 7, thereby achieving the position adjustment of the welding torch 9 along the axial direction of the cylinder 1. The control module is connected to the welding torch 9, and the magnet 5 is connected to a magnetic force adjusting switch. By operating the magnetic force adjusting switch, the attraction force of the magnet 5 can be controlled, thereby facilitating the installation, disassembly and position adjustment of the annular track 4. The roller assembly includes a base 21 fixed to the top of the support frame 2, a roller 22 hingedly connected to the base 21, and a third drive unit connected to the roller 22. The peripheral surface of the roller 22 is in contact with the peripheral surface of the cylinder 1, and the third drive unit can drive the roller 22 to rotate, thereby driving the cylinder 1 to rotate around its own axis, thereby providing a stable circular motion basis for the overlaying.

[0020] As a specific embodiment, in the gasification furnace cylinder's hardy alloy overlaying device of the present application, the number of support frames 2 is 2-4, and the plurality of support frames 2 are uniformly distributed along the axial direction of the cylinder 1. More specifically, the number of support frames 2 is two, and of course, the specific number of support frames 2 can be flexibly adjusted according to the length and weight of the cylinder 1.

[0021] As a specific embodiment, in the gasifier cylinder's hard-facing device of the present application, the anti-skid layer is arranged on the circumferential surface of the roller 22, so that the friction between the roller 22 and the outer periphery of the cylinder 1 is increased, the relative sliding between the roller 22 and the cylinder 1 is prevented, the axial movement of the cylinder 1 during rotation is avoided, and the stability of the cylinder 1 during the hard-facing process is ensured.

[0022] As a specific embodiment, in the gasifier cylinder's hard-facing device of the present application, the welding gun 9 is a gas shielded arc welding gun, which can improve the welding efficiency and reduce the weld dilution rate, and fully exert the performance advantages of the hard-facing alloy.

[0023] As a specific embodiment, in the gasifier cylinder's hard-facing device of the present application, the annular track 4 comprises a plurality of arc-shaped tracks that are overlapped with each other, and different numbers and sizes of arc-shaped tracks can be flexibly spliced according to the inner diameter of the cylinder 1, so as to adapt to different specifications of the gasifier cylinder 1.

[0024] On the other hand, the hard-facing method of the gasifier cylinder's hard-facing device of the present application is implemented by using the above-mentioned hard-facing device, and specifically comprises the following steps: Step 1: The support frame 2 is leveled and aligned to ensure that the top of the support frame 2 is on the same horizontal plane, and to provide stable support for the cylinder 1. The cylinder 1 to be hard-faced is placed on the support frame 2, so that the outer periphery of the cylinder 1 abuts against the circumferential surface of the roller 22. The position of the cylinder 1 is adjusted to ensure that the axis of the cylinder 1 is parallel to the rotation axis of the roller 22. The annular track 4 and the trolley 6 are installed in the cylinder 1. The annular track 4 is attracted to the inner wall of the cylinder 1 by the magnet 5 through the operation of the magnetic adjustment switch, so that the annular track 4 is coaxially arranged with the cylinder 1. More specifically, the cylinder 1 is composed of multiple segments. When installing the annular track 4 each time, the annular track 4 is positioned and aligned by the end face of the same reference cylinder 1, so as to ensure that the welds of each welding cycle can be evenly overlapped. The annular track 4 is parallel to the end face of each segment of the cylinder 1. Then, the trolley 6 is installed on the inner wall of the annular track 4, so that the pulley is adapted to the annular track 4, and the trolley 6 can smoothly slide along the annular track 4. The wobble plate 8 is installed at the end of the rack 7, and the initial connection relationship between the wobble plate 8 and the rack 7 is fixed. The welding gun 9 is fixed on the wobble plate 8, and the initial distance between the welding gun 9 and the inner wall of the cylinder 1 is adjusted to ensure that the welding gun 9 is in the best welding posture. Step 2: simultaneously start the first driving unit and the third driving unit, rotate the barrel 1 counterclockwise, slide the trolley 6 along the annular track 4 downward, and adjust the first driving unit and the third driving unit so that the rotation speed of the barrel 1 and the walking speed of the trolley 6 are the same, the purpose of which is to make the welding gun 9 always weld at a relatively fixed position of the barrel 1, so as to ensure the consistency of the cladding layer thickness, because the same welding process parameters will lead to different cladding layer thicknesses at different welding positions, so as to ensure that the welding gun 9 forms a continuous and uniform weld on the inner wall of the barrel 1, and at the same time, start the welding gun 9, and after the barrel 1 rotates one circle, close the welding gun 9, complete the first pass of the hard-facing of the hastelloy, and correspondingly form the first weld, more specifically, the hard-facing operation in the present patent is performed by using hastelloy C22. Step 3: move the wobbler 8 along the rack 7 by the second driving unit to the first preset distance in the hard-facing direction, perform the second pass of the hard-facing of the hastelloy, start the welding gun 9, and after the barrel 1 rotates one circle, close the welding gun 9, complete the second pass of the hard-facing of the hastelloy, and need to ensure that the second weld overlaps the first weld by the second preset distance, so as to avoid the weld gap, guarantee the continuity and integrity of the cladding layer, improve the overall density and structural strength of the cladding layer, and avoid the performance weak point caused by the concentrated weld overlap position. Step 4: repeat the above step 3 to sequentially complete the third pass and subsequent hard-facing of the barrel 1, until the wobbler 8 moves to the limit position close to the retainer 3 and cannot continue to move along the rack 7 in the hard-facing direction, more specifically, in the present embodiment, because the length of the rack 7 of the trolley 6 is limited, the wobbler 8 can move thirty times, so under the premise of not moving the annular track 4, at most thirty passes of hard-facing can be performed at one time, then the annular track 4 is moved to the hard-facing direction by a third preset distance under the premise that the annular track 4 is separated from the inner wall of the barrel 1, the third preset distance needs to be adapted to the length of the rack 7 to ensure that the wobbler 8 can continue to cover the unhard-faced area after the displacement, then the wobbler 8 is restored to the initial position by the second driving unit, and the above steps 2-3 are repeated until the first layer of hard-facing 11 of the entire area of the inner wall of the barrel 1 is completed.

[0025] As a specific embodiment, in the hard-facing method of the gasifier barrel of the present patent, when two layers and above of the hastelloy need to be hard-faced in the barrel 1, after completing step 4: repeating the above step 3 to sequentially complete the third pass and subsequent hard-facing of the barrel 1, until the wobbler 8 moves to the limit position close to the retainer 3, the wobbler 8 is restored to the initial position by the second driving unit, and the distance between the welding gun 9 and the inner wall of the barrel 1 is adjusted, the first pass of the second layer of hard-facing is started, and the above steps 2-4 are repeated until the hard-facing of the two layers and above of the hastelloy in the barrel 1 is completed.

[0026] As a specific embodiment, in the hardfacing method of the gasifier cylinder of the application, when two or more layers of hardfacing need to be hardfaced in the cylinder 1, the first welding bead between the previous layer and the next layer needs to be staggered by half the distance of the first welding bead, so that each subsequent layer of hardfacing can be well overlapped, more specifically, the first welding bead of the second layer of hardfacing 12 needs to be staggered by half the distance of the first welding bead of the first layer of hardfacing 11.

[0027] As a specific embodiment, in the hardfacing method of the gasifier cylinder of the application, the control module is used to adjust the swing mode, swing frequency and swing amplitude of the swing device 8, and by optimizing the swing parameters, the quality of the hardfaced layer is further improved, and it is ensured that the hardfaced layer uniformly covers the inner wall of the cylinder 1. Of course, the appearance size of the weld is related to the swing mode, swing frequency and swing amplitude of the welding torch 9, and is also related to the welding current, arc voltage and welding speed.

[0028] As a specific embodiment, in the hardfacing method of the gasifier cylinder of the application, the first preset distance is 10-15 mm, the second preset distance is 3-5 mm, and the third preset distance is 350-450 mm.

[0029] In summary, compared with the prior art, the hardfacing device and method for the gasifier cylinder of the application have the following advantages and positive effects: (1) The application uses the synchronous movement control of the welding torch 9, the trolley 6 and the cylinder 1 to greatly improve the welding efficiency, and the movement of the trolley 6 and the rotation of the cylinder 1 are independently controllable, and multiple devices can be installed in the cylinder 1 for parallel construction, which can flexibly adjust the construction rhythm according to the construction period requirements, effectively shorten the hardfacing period, and through the selection of the gas shielded welding torch and the precise control of the welding parameters by the control module, the dilution effect of the base material on the weld can be reduced, the effective component ratio of the hardfacing layer can be ensured, and the performance of the hardfacing layer can be fully utilized. (2) The anti-skid layer of the roller assembly can prevent the cylinder 1 from rotating and moving, the synchronous speed control of the trolley 6 and the cylinder 1 and the welding bead overlap distance control can avoid poor welding bead overlap, and the welding bead misplacement arrangement during layer hardfacing can further improve the density of the hardfaced layer and reduce quality defects. The device is installed and disassembled by magnetic attraction of the annular track 4, and the automatic position adjustment of the swing device 8, which simplifies the hardfacing operation process, reduces the hardfacing construction difficulty, and uses the annular track 4 formed by arc-shaped tracks, which can be used to adapt to gasifier cylinders 1 with different inner diameters, and the number of support frames 2 can be flexibly adjusted, which can be used to adapt to cylinders 1 with different lengths and weights, and has good applicability.

[0030] It should be noted that, in this article, unless otherwise specified and limited, the term "connection" or its synonyms should be understood broadly, for example, "connection" can be fixed connection, can also be detachable connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through intermediate medium, can be internal communication of two elements or interaction relationship of two elements, and those skilled in the art can understand the specific meaning of the above-mentioned term in the present application according to the specific circumstances. Moreover, expressions such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. At the same time, the term "includes", "contains" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or equipment. In addition, "front", "back", "left", "right", "up", "down" in this article are referred to the placement state shown in the drawings.

[0031] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A Hastelloy overlay welding device for a gasifier cylinder, characterized in that, The system includes multiple support frames located below the cylinder, a roller assembly located above one end of each support frame, an annular track connected to the inner wall of the cylinder via magnets, a trolley slidably connected to the inner wall of the annular track, a swing device connected to the trolley, a welding torch fixed to the swing device, and a control module located on the swing device, wherein: The trolley is equipped with a first drive unit. The output shaft of the first drive unit is connected to a pulley that matches the annular track. The pulley is slidably connected to the annular track. A retainer is provided on one side of the trolley. A rack is fixedly connected to the retainer. The oscillator has an adjustment hole that is slidably connected to the circumferential surface of the rack. A second drive unit connected to the rack is provided inside the oscillator. The control module is connected to the welding torch, the magnet is connected to a magnetic force adjustment switch, and the roller assembly includes a base fixed to the top of the support frame, a roller hinged to the base, and a third drive unit connected to the roller. The circumferential surface of the roller contacts the circumferential surface of the cylinder.

2. The Hastelloy overlay welding device for the gasifier cylinder according to claim 1, characterized in that, The number of support frames is 2 to 4, and the multiple support frames are evenly distributed along the axial direction of the cylinder.

3. The Hastelloy overlay welding device for the gasifier shell according to claim 1, characterized in that, The roller has an anti-slip layer on its circumference.

4. The Hastelloy overlay welding device for the gasifier shell according to claim 1, characterized in that, The welding torch is a gas metal arc welding torch.

5. The Hastelloy overlay welding device for the gasifier shell according to claim 1, characterized in that, The circular track comprises multiple overlapping arc-shaped tracks.

6. A method for Hastelloy surfacing of a gasifier shell, said Hastelloy surfacing method being carried out using the Hastelloy surfacing apparatus as described in any one of claims 1 to 5, comprising: Step 1: Level and align the support frame, place the cylinder to be welded on the support frame, so that the outer periphery of the cylinder abuts against the circumferential surface of the roller, install the annular track and the trolley inside the cylinder, and use the magnetic force adjustment switch to make the magnet adhere to the inner wall of the cylinder, install the oscillator on the end of the rack, and fix the welding gun on the oscillator; Step 2: Simultaneously start the first drive unit and the third drive unit to make the cylinder rotate counterclockwise and the trolley slide downward along the circular track. Adjust the first drive unit and the third drive unit so that the rotation speed of the cylinder and the travel speed of the trolley are the same. At the same time, start the welding torch. After the cylinder rotates one revolution, turn off the welding torch to complete the first Hastelloy overlay welding and form the first weld bead. Step 3: Move the oscillator along the rack in the welding direction by a first preset distance using the second drive unit to perform the second Hastelloy welding. Start the welding gun, and after the cylinder rotates one revolution, turn off the welding gun to complete the second Hastelloy welding. It is necessary to ensure that the second weld overlaps the first weld by a second preset distance. Step 4: Repeat Step 3 above to complete the third and subsequent welding of the cylinder body until the oscillator moves to the limit position near the retainer. Then, use the magnetic adjustment switch to disengage the annular track from the inner wall of the cylinder body and move the annular track a third preset distance in the welding direction. Then, use the second drive unit to restore the oscillator to its initial position and repeat Steps 2 to 3 above until the welding of the inner wall of the cylinder body is completed.

7. The Hastelloy overlay welding method for the gasifier shell according to claim 6, characterized in that, When two or more layers of Hastelloy alloy need to be deposited inside the cylinder, in step 4: repeat step 3 above to complete the third and subsequent deposits of the cylinder until the oscillator moves to the limit position near the retainer. Then, restore the oscillator to the initial position through the second drive unit, adjust the distance between the welding torch and the inner wall of the cylinder, start the first deposit of the second layer, and repeat steps 2 to 4 above until all two or more layers of Hastelloy alloy inside the cylinder are deposited.

8. The Hastelloy overlay welding method for the gasifier shell according to claim 7, characterized in that, When two or more layers of Hastelloy are to be deposited inside the cylinder, the first weld bead of the upper layer and the first weld bead on the lower side need to be staggered by half the distance of the first weld bead.

9. The Hastelloy overlay welding method for the gasifier shell according to claim 6, characterized in that, The control module is used to adjust the swing mode, swing frequency, and swing amplitude of the oscillator.

10. The Hastelloy overlay welding method for the gasifier shell according to claim 6, characterized in that, The first preset distance is 10-15mm, the second preset distance is 3-5mm, and the third preset distance is 350-450mm.

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