Low-alloy steel narrow-gap all-position butt welding device and welding method under preheating working condition

Abstract

The invention relates to the technical field of welding, and particularly discloses a low-alloy steel narrow-gap all-position butt welding device and welding method under a preheating working condition, and the low-alloy steel narrow-gap all-position butt welding device comprises an annular guide rail, a trolley platform, a feeding platform and a welding platform; a plurality of sets of ejector rods are arranged on the inner side of the annular guide rail, and the annular guide rail and the low alloy steel outer wall are fixed in a mutually-abutting mode through the ejector rods. The trolley platform is in driving fit with the annular guide rail; an adjusting cross rod is arranged between the welding platform and the trolley platform, one end of the adjusting cross rod is fixedly connected with the welding platform, and the other end of the adjusting cross rod is adjustably connected with the trolley platform; the welding platform is provided with a welding assembly, and the welding assembly faces the low alloy steel outer wall. The feeding platform comprises a wire feeding pipe and a wire feeding disc. Through the design of the annular guide rail and the ejector rod, the stability and precision of the guide rail in the welding process are ensured, and therefore the overall precision of welding operation is improved.

Description

Technical Field

[0001] The invention relates to the technical field of welding, and in particular to a low alloy steel narrow gap all-position butt welding device and a welding method under preheating conditions. Background Art

[0002] In the process of manufacturing and repairing low alloy steel, outer wall welding is a key process. However, due to the special shape and position of the outer wall of low alloy steel, traditional welding methods often fail to achieve ideal welding results. In addition, welding operations under preheating conditions place higher requirements on the stability and accuracy of the equipment. Therefore, a device and method specifically for welding the outer wall of low alloy steel under preheating conditions is required. Summary of the invention

[0003] In order to overcome the problems existing in the prior art, the purpose of the present invention is to provide a low alloy steel narrow gap all-position butt welding device and a welding method under preheating conditions.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a low-alloy steel narrow gap all-position butt welding device under preheating conditions, comprising: an annular guide rail, a trolley platform, a feeding platform, and a welding platform; a plurality of groups of push rods are arranged on the inner side of the annular guide rail, and the annular guide rail is pressed and fixed to the outer wall of the low-alloy steel through the plurality of groups of push rods; the trolley platform is driven and cooperated with the annular guide rail; an adjusting cross bar is arranged between the welding platform and the trolley platform, one end of the adjusting cross bar is fixedly connected to the welding platform, and the other end of the adjusting cross bar is adjustably connected to the trolley platform; the welding platform is provided with a welding assembly, and the welding assembly faces the outer wall of the low-alloy steel; the feeding platform comprises a wire feeding tube and a wire feeding reel, the wire feeding reel is installed on the trolley platform for storing welding wire, the wire feeding tube is arranged on one side of the welding assembly, and the welding wire is drawn out from the wire feeding reel and passes through the welding assembly for welding operation.

[0005] Main working principle: The annular guide rail is designed to fit the shape of the outer wall of the low alloy steel closely, and is fixed to the outer wall by multiple sets of push rods. This design ensures the stability and precision of the guide rail during welding. The function of the push rod is to provide sufficient support for the annular guide rail to prevent it from being displaced or deformed due to external forces during welding. The trolley platform and the annular guide rail are matched through a driving mechanism (such as a motor, roller, etc.), so that the trolley platform can move smoothly along the annular guide rail. This design allows welding operations to be performed at any position on the outer wall of the low alloy steel, improving the flexibility and coverage of welding. One end of the adjustment crossbar is fixedly connected to the welding platform, and the other end is adjustably connected to the trolley platform. This design allows the user to adjust the distance and angle between the welding platform and the outer wall of the low alloy steel according to actual needs. A welding assembly is provided on the welding platform, and the welding assembly faces the outer wall of the low alloy steel for welding operations. By adjusting the adjustment crossbar, it can be ensured that the welding assembly maintains a stable posture and position during the welding process. The feeding platform includes a wire feeding tube and a wire feeding reel. The wire feeding reel is installed on the trolley platform and is used to store the welding wire. The wire feeding tube is set on one side of the welding assembly and is used to extract the welding wire from the wire feeding reel and transport it to the welding assembly. During the welding process, the welding wire is continuously transported to the welding assembly through the wire feeding tube, and melted and accumulated on the outer wall of the low alloy steel under the action of the welding assembly to form a welding layer.

[0006] In summary, the working principle of the present invention can be summarized as follows: the device is fixed on the outer wall of low alloy steel by means of annular guide rails and a push rod; the driving mechanism in the trolley platform cooperates with the annular guide rails and moves along the annular guide rails at the same time, and the trolley platform drives the feeding platform and the welding platform to move along the annular guide rails during the movement, so that the welding platform can move outside the welding position; the position and angle of the welding platform are adjusted by adjusting the crossbar; a stable supply of welding wire is provided by the feeding platform; and finally, the welding operation of the outer wall of low alloy steel is completed under the action of the welding assembly. This design not only improves the accuracy and efficiency of welding, but also enhances the stability and applicability of the device.

[0007] Preferably, the welding assembly comprises a base, a welding part and a blowing part;

[0008] The base is connected to the adjusting cross bar, the welding part and the blowing part are arranged at the front of the base, and the working end of the welding part and the working end of the blowing part are both facing the outer wall of the low alloy steel;

[0009] The welding part passes through the middle of the blowing part, and air outlets are arranged on both sides of the blowing part, and the air outlets on both sides face the ends of the welding part.

[0010] Preferably, the blowing portion comprises an outer frame;

[0011] An air blowing cavity is provided inside the outer frame, the air blowing cavity is provided with an air outlet, the air outlet faces the end of the welding portion, an air inlet is provided on a side of the air blowing cavity away from the air outlet, and the air blowing cavity is connected to the air path through the air inlet;

[0012] The blowing cavity includes an air inlet and an air outlet, wherein the air inlet is connected to the air inlet and is parallel to the welding portion; the air outlet is connected to the air outlet and gradually approaches the welding portion along the direction of the air outlet.

[0013] Preferably, the blowing part further includes a side plate;

[0014] The blowing cavity is provided with a side opening, and the side plate is installed to cover the opening of the side opening;

[0015] The blowing cavity is provided with a plurality of slots along the direction of airflow, each of the slots is provided with a buffer net, and the buffer net is tightly matched with the slot.

[0016] Preferably, the welding part comprises a welding head, a connecting pipe and a water diversion pipe, wherein the welding head is installed at one end of the connecting pipe, and the welding head faces the outer wall of the low alloy steel; the other end of the connecting pipe is connected to the base and extends to the periphery of the base;

[0017] The water guide pipe is inserted into the connecting pipe from an extended portion of the connecting pipe.

[0018] Preferably, a rack is provided on the periphery of the annular guide rail, and the trolley platform is provided with a driven roller assembly and a driving roller assembly, the driven roller assembly and the driving roller assembly are arranged in parallel, and the driven roller assembly and the driving roller assembly are arranged on the side of the trolley platform facing the annular guide rail, and a gap is provided in the middle of the driving roller assembly and the driven roller assembly for the annular guide rail to pass through; a driving motor is provided at one end of the driving roller assembly, and a rolling gear is provided on the surface of the driving roller assembly, the annular guide rail passes through the gap between the driving roller assemblies, the rolling gear is meshed with the rack, the annular guide rail passes through the gap between the driven roller assemblies, and the driven roller assembly clamps the annular guide rail.

[0019] Preferably, the feeding platform is provided with a feeding roller, the feeding roller is arranged on one side of the wire feeding disk, and the feeding roller is driven by a motor.

[0020] Preferably, the feeding platform includes a fixing rod, one end of which is connected to the welding platform, the fixing rod is provided with a fixing groove along the direction of the welding assembly, and the wire feeding tube is provided with an adjusting screw, and the adjusting screw passes through the fixing groove to fix the wire feeding tube to the fixing rod.

[0021] A method for butt welding low alloy steel with narrow gap in all positions under preheating conditions is provided by using any of the above-mentioned butt welding devices for butt welding low alloy steel with narrow gap in all positions under preheating conditions, and the steps are as follows:

[0022] S1, install the annular guide rail on the outer wall of the low alloy steel and tighten it;

[0023] S2, installing the trolley platform on the annular guide rail for trial welding, and observing whether the welding platform interferes with the outer wall of the low-alloy steel. If there is interference, adjustment is performed until the interference is eliminated;

[0024] S3, after the trial welding is completed, the trolley platform is removed, and the area of ​​the low-alloy steel outer wall to be welded is preheated, and the preheating temperature needs to be maintained at 150-250℃, and the heating time is not less than 2 hours to reach a uniform temperature;

[0025] S4, after the temperature is equalized, reinstall the trolley platform on the circular guide rail until the welding is completed.

[0026] Preferably, in S3, if the preheating process is interrupted, the outer wall of the low alloy steel needs to be reheated, the preheating temperature needs to be maintained at 250-400°C, and the heating time is not less than 4 hours to reach a uniform temperature.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention ensures the stability and accuracy of the guide rail during welding by adopting the design of an annular guide rail and a push rod, thereby improving the overall accuracy of the welding operation. The design of the annular guide rail and the push rod enables the device to fit tightly to the outer wall of the low-alloy steel and maintain a stable posture during the welding process, thereby enhancing the stability of the device; the driving coordination between the trolley platform and the annular guide rail, as well as the adjustable connection of the adjustment crossbar, enable the welding platform to flexibly adjust the position and angle according to actual needs, further improving the accuracy and efficiency of welding. The feeding platform includes a wire feeding tube and a wire feeding reel. The wire is drawn out of the wire feeding reel through the wire feeding tube and transported to the welding assembly, thereby achieving a stable supply of the welding wire. This design ensures the continuity and stability of the welding wire during welding, and avoids welding defects caused by wire breakage or insufficient supply.

[0029] In summary, the low alloy steel narrow gap all-position butt welding device under preheating conditions of the present invention has significant beneficial effects, including improving welding accuracy and efficiency, enhancing device stability and applicability, achieving stable supply of welding wire, simplifying operation procedures, and improving welding quality and reliability. These beneficial effects make the present invention have broad promotion value and application prospects in industrial applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0031] Figure 1 Schematic diagram of the low alloy steel narrow gap all-position butt welding device under the preheating condition Figure 1 ;

[0032] Figure 2 Schematic diagram of the low alloy steel narrow gap all-position butt welding device under the preheating condition Figure 2 ;

[0033] Figure 3 This is a schematic diagram of the welding platform Figure 1 ;

[0034] Figure 4 This is a schematic diagram of the welding platform Figure 2 ;

[0035] Figure 5 This is a diagram of the car platform Figure 1 ;

[0036] Figure 6 This is a diagram of the car platform Figure 2 ;

[0037] Figure 7 Schematic diagram of the circular guide rail.

[0038] 1. Annular guide rail; 10. Ejector rod; 11. Rack; 2. Trolley platform; 20. Active roller assembly; 200. Hobbing gear; 21. Driven roller assembly; 22. Slide; 23. Locking knob; 3. Feeding platform; 30. Wire feeding disc; 31. Wire feeding tube; 32. Feeding roller; 33. Fixing rod; 34. Fixing slot; 35. Adjusting screw; 4. Welding platform; 40. Welding assembly; 400. Base; 4000. Rotating motor; 4 001, rotating gear set; 401, welding part; 4010, welding head; 4011, connecting pipe; 4012, water diversion pipe; 402, blowing part; 4020, air inlet; 4021, air outlet; 4022, outer frame; 4023, blowing cavity; 4024, air inlet; 4025, blowing part; 4026, side panel; 4027, side port; 4028, card slot; 4029, buffer net; 5, adjusting cross bar; 50, scale. DETAILED DESCRIPTION

[0039] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention, and the embodiments described are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the art without making creative work are within the scope of protection of the present invention.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0041] Example 1

[0042] This embodiment discloses a low alloy steel narrow gap all-position butt welding device under preheating conditions, such as Figure 1-Figure 7 As shown, it includes: an annular guide rail 1, a trolley platform 2, a feeding platform 3, and a welding platform 4; a plurality of groups of push rods 10 are arranged on the inner side of the annular guide rail 1, and the annular guide rail 1 is fixed to the outer wall of the low alloy steel by the plurality of push rods 10; the trolley platform 2 is driven and matched with the annular guide rail 1; an adjusting cross bar 5 is arranged between the welding platform 4 and the trolley platform 2, one end of the adjusting cross bar 5 is fixedly connected to the welding platform 4, and the other end of the adjusting cross bar 5 is adjustably connected to the trolley platform 2; the welding platform 4 is provided with a welding assembly 40, and the welding assembly 40 faces the outer wall of the low alloy steel; the feeding platform 3 includes a wire feeding tube 31 and a wire feeding reel 30, and the wire feeding reel 30 is installed on the trolley platform 2 for storing welding wire, and the wire feeding tube 31 is arranged on one side of the welding assembly 40, and the welding wire is drawn out from the wire feeding reel 30 and passes through the welding assembly 40 for welding. The annular guide rail 1 is tightly attached and fixed to the outer wall of the low alloy steel by the plurality of push rods 10, so as to ensure the stability of the device during the welding process.

[0043] The trolley platform 2 is driven and matched with the annular guide rail 1, and can move freely along the guide rail to facilitate the welding operation. The welding platform 4 is connected to the trolley platform 2 by adjusting the crossbar 5, and the position and angle of the welding assembly 40 can be flexibly adjusted to ensure the accuracy and efficiency of welding. The feeding platform 3 includes a wire feeding tube 31 and a wire feeding disc 30 to achieve continuous and stable supply of welding wire and ensure the smooth progress of welding operation. The structure is compact and easy to operate, and can significantly improve the efficiency and accuracy of welding operation. The design of the annular guide rail 1 and the top rod 10 ensures the stability and safety of the device during the welding process. The setting of the feeding platform 3 realizes the automatic supply of welding wire, reduces manual intervention, and improves work efficiency.

[0044] In some optional embodiments, the welding assembly includes a base, a welding part and an air blowing part. The base is connected to the adjusting cross bar by bolts to ensure stability. The welding part and the air blowing part are both arranged at the front of the base, the working end of the welding part is the welding gun head, and the working end of the air blowing part is the air blowing nozzle, both of which face the outer wall of the low alloy steel, the welding part passes through the middle of the air blowing part, and air outlets are arranged on both sides of the air blowing part, and the air outlets face the welding gun head, which are used to blow away welding smoke and cool the weld during welding.

[0045] In some optional embodiments, the blowing part includes an outer frame and an internally arranged blowing cavity, the outer frame is made of high temperature resistant material to ensure that it will not deform during the welding process, and the blowing cavity is provided with an air outlet and an air inlet, the air inlet is connected to the air path through an air pipe, and is used to provide the gas required for blowing. The blowing cavity is divided into an air inlet and an air outlet, the air inlet is connected to the air inlet, and is kept parallel to the welding part to ensure that the gas flows in evenly. The air outlet is connected to the air outlet, and gradually approaches the welding part along the direction of the air outlet. This setting can destroy the continuity of the airflow in the blowing cavity, so that the airflow will not converge to form a gathered airflow when it is discharged from the air outlet, making the airflow smoother and improving the blowing effect.

[0046] In some optional embodiments, the blowing cavity is provided with three slots along the direction of airflow, and a buffer net is installed in each slot. The buffer net is made of high temperature resistant and corrosion resistant materials, and is used to filter impurities in the airflow, and can also further avoid the airflow gathering and causing excessive local airflow. The buffer net is connected to the slot by a clamping fit, and the buffer net can be easily replaced.

[0047] In some optional embodiments, the welding part includes a welding head, a connecting pipe and a water guide pipe. The welding head is installed at one end of the connecting pipe for welding. The other end of the connecting pipe is connected to the base through a threaded connection and extends to the periphery of the base, so as to be connected to an external welding power source and a cooling water source. The water guide pipe is inserted into the connecting pipe from the extension portion of the connecting pipe, and introduces external water flow. The water flow enters the connecting pipe through the water guide pipe and is discharged from the gap between the water guide pipe and the connecting pipe, so as to provide cooling water for the welding head during the welding process to prevent the welding head from being damaged due to overheating.

[0048] In some optional implementations, a rotating motor and a rotating gear set are provided in the base. The rotating motor is connected to an external power source through a wire to provide a driving force. The rotating gear set cooperates with the rotating motor to realize the rotational movement of the welding part. The connecting pipe and the rotating gear set cooperate with each other through a key connection or a spline connection to ensure that the connecting pipe will not loosen or fall off during the rotation process.

[0049] In some optional embodiments, a rack 11 is provided on the periphery of the annular guide rail 1, and the trolley platform 2 is provided with a driven roller assembly 21 and a driving roller assembly 20. The driven roller assembly 21 and the driving roller assembly 20 are arranged in parallel, and the driven roller assembly 21 and the driving roller assembly 20 are arranged on the side of the trolley platform 2 facing the annular guide rail 1, and a gap is provided in the middle of the driving roller assembly 20 and the driven roller assembly 21 for the annular guide rail 1 to pass through; a driving motor is provided at one end of the driving roller assembly 20, and a rolling gear 200 is provided on the surface of the driving roller assembly 20, the annular guide rail 1 passes through the gap between the driving roller assemblies 20, the rolling gear 200 is meshed with the rack 11, the annular guide rail 1 passes through the gap between the driven roller assemblies 21, and the driven roller assembly 21 clamps the annular guide rail 1.

[0050] Specifically, Figure 7 As shown, a rack 11 is provided on the periphery of the annular guide rail 1, which meshes with the hobbing gear 200 of the active roller assembly 20 on the trolley platform 2, so as to achieve precise driving of the trolley platform 2 on the annular guide rail 1. The driven roller assembly 21 is arranged in parallel with the active roller assembly 20, and clamps the annular guide rail 1, further enhancing the stability of the trolley platform 2 during movement.

[0051] In some optional embodiments, the feeding platform 3 is provided with a feeding roller. The feeding roller 32 is arranged on one side of the wire feeding disk 30, and the feeding roller 32 is driven by a motor to realize continuous supply of welding wire.

[0052] In some optional embodiments, the feeding platform 3 includes a fixing rod 33, one end of which is connected to the welding platform 4, and the fixing rod 33 is provided with a fixing groove 34 along the direction of the welding assembly 40. The wire feeding tube 31 is provided with an adjusting screw 35, and the adjusting screw 35 passes through the fixing groove 34 to fix the wire feeding tube 31 on the fixing rod 33. By adjusting the tightness of the adjusting screw 35, the position of the wire feeding tube 31 in the fixing groove 34 is changed.

[0053] First, the device is fixed to the outer wall of the low alloy steel by the annular guide rail 1 and multiple groups of push rods 10, ensuring stability during welding. A rack 11 is provided on the periphery of the annular guide rail 1, which meshes with the rolling gear 200 of the active roller assembly 20 on the trolley platform 2, and the active roller assembly 20 is driven by the driving motor to rotate, thereby realizing the movement of the trolley platform 2 along the annular guide rail 1. The trolley platform 2 and the welding platform 4 are connected by an adjusting cross bar 5, one end of the adjusting cross bar 5 is fixed to the welding platform 4, and the other end is inserted into the sliding mouth 22 of the trolley platform 2 and can move along the sliding mouth 22. By adjusting the position of the adjusting cross bar 5 in the sliding mouth 22 and fixing it with the locking knob 23, the rough adjustment of the position of the welding platform 4 can be achieved. A scale 50 is provided on the surface of the adjusting cross bar 5 to facilitate precise control of the adjustment amount.

[0054] The welding assembly 40 is installed on the welding platform 4, including a base 400, a welding part 401 and a blowing part 4025402. The base 400 is connected to the adjusting cross bar 5 to ensure that the welding part 401 and the blowing part 4025402 are firmly arranged at the front of the base 400, and the working ends are facing the outer wall of the low alloy steel.

[0055] When welding begins, the welding part 401 passes through the middle of the blowing part 4025402. Gas outlets 4021 are provided on both sides of the blowing part 4025402. The gas outlets 4021 face the ends of the welding part 401 to provide gas protection during welding and prevent the welding part 401 from overheating.

[0056] The blowing part 4025402 includes an outer frame 4022 and an internally arranged blowing cavity 4023. An air inlet 4020 is arranged on the side of the blowing cavity 4023 away from the air outlet 4021. The air inlet 4020 is connected to the air path to ensure that the gas can smoothly enter the blowing cavity 4023. The blowing cavity 4023 is divided into an air inlet 4024 and an air outlet. The air inlet 4024 is connected to the air inlet 4020 and remains parallel to the welding part 401; the air outlet is connected to the air outlet 4021 and gradually approaches the welding part 401 along the direction of the air outlet 4021. This setting can destroy the continuity of the airflow in the blowing cavity 4023, so that the airflow will not converge to form a gathered airflow when it is discharged from the air outlet 4021, making the airflow smoother and improving the blowing effect.

[0057] A side plate 4026 is installed at the side opening 4027 of the blowing cavity 4023 to prevent gas leakage. A plurality of slots 4028 are provided in the blowing cavity 4023 along the direction of air flow. A buffer net 4029 is installed in each slot 4028 to slow down the air flow speed and evenly distribute the gas.

[0058] The welding part 401 includes a welding head 4010, a connecting pipe 4011 and a water pipe 4012. The welding head 4010 is installed at one end of the connecting pipe 4011 and faces the outer wall of the low alloy steel, ready for welding. The other end of the connecting pipe 4011 is connected to the base 400 and extends to the periphery of the base 400, so as to be connected to the welding power supply and other equipment. The water pipe 4012 is inserted into the connecting pipe 4011 from the extension of the connecting pipe 4011, and is used to provide cooling water during the welding process to protect the welding head 4010 and the connecting pipe 4011 from high temperature damage. The feeding platform 3 includes a wire feeding tube 31 and a wire feeding reel 30, and the wire feeding reel 30 is installed on the trolley platform 2 for storing welding wire. The wire feeding tube 31 is arranged on one side of the welding assembly 40, and the welding wire is drawn out from the wire feeding reel 30 and passes through the welding assembly 40 for welding. The feeding platform 3 is also provided with a feeding roller 32 and a fixing rod 33. The feeding roller 32 is driven by a motor and is used to continuously draw the welding wire from the wire feeding disc 30. One end of the fixing rod 33 is connected to the welding platform 4, and the other end is provided with a fixing groove 34. The wire feeding tube 31 is provided with an adjusting screw 35. By adjusting the position of the adjusting screw 35 in the fixing groove 34, the angle and position of the wire feeding tube 31 can be finely adjusted to ensure that the welding wire is accurately delivered to the welding assembly 40.

[0059] In summary, the low alloy steel narrow gap all-position butt welding device under preheating conditions realizes accurate welding of the outer wall of the low alloy steel through the cooperation of the annular guide rail 1, the trolley platform 2, the feeding platform 3 and the welding platform 4. By adjusting the crossbar 5, the multi-stage sliding mechanism of the welding platform 4 and the fixing rod 33 of the feeding platform 3 and other components, the position and angle of the welding assembly 40, as well as the feeding speed and direction of the welding wire can be accurately controlled to meet various complex welding requirements.

[0060] Example 2

[0061] The method for butt welding low alloy steel with narrow gap in all positions under preheating conditions is characterized by the following steps:

[0062] S1, installing the annular guide rail 1 on the outer wall of the low alloy steel and tightening and fixing it;

[0063] S2, install the trolley platform 2 on the annular guide rail 1 to conduct test welding, and observe whether the welding platform 4 interferes with the outer wall of the low-alloy steel. If there is interference, adjust it until the interference is eliminated;

[0064] S3, after the trial welding is completed, the trolley platform 2 is removed, and the area of ​​the low-alloy steel outer wall to be welded is preheated, and the preheating temperature needs to be maintained at 150-250°C, and the heating time is not less than 2 hours to reach a uniform temperature;

[0065] S4, after the temperature is equalized, the trolley platform 2 is reinstalled on the annular guide rail 1 until the welding is completed.

[0066] In some optional embodiments, in S3, if the preheating process is interrupted, the outer wall of the low alloy steel needs to be reheated, the preheating temperature needs to be maintained at 250-400°C, and the heating time is not less than 4 hours to reach a uniform temperature.

[0067] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. Low alloy steel narrow gap all-position butt welding device under preheating conditions, characterized in that: include: Annular guide rail, trolley platform, feeding platform, welding platform; A plurality of push rods are arranged on the inner side of the annular guide rail, and the annular guide rail is fixed to the outer wall of the low alloy steel by the plurality of push rods; the trolley platform is drivingly matched with the annular guide rail; An adjusting cross bar is provided between the welding platform and the trolley platform, one end of the adjusting cross bar is fixedly connected to the welding platform, and the other end of the adjusting cross bar is adjustably connected to the trolley platform; the welding platform is provided with a welding assembly, and the welding assembly faces the outer wall of the low-alloy steel; The feeding platform includes a wire feeding tube and a wire feeding reel. The wire feeding reel is installed on the trolley platform for storing welding wire. The wire feeding tube is arranged on one side of the welding assembly. The welding wire is drawn out from the wire feeding reel and passes through the welding assembly for welding operation.

2. The low alloy steel narrow gap all-position butt welding device under preheating conditions according to claim 1 is characterized in that: The welding assembly comprises a base, a welding part and a blowing part; The base is connected to the adjusting cross bar, the welding part and the blowing part are arranged at the front of the base, and the working end of the welding part and the working end of the blowing part are both facing the outer wall of the low alloy steel; The welding part passes through the middle of the blowing part, and air outlets are arranged on both sides of the blowing part, and the air outlets on both sides face the ends of the welding part.

3. The low alloy steel narrow gap all-position butt welding device under preheating conditions according to claim 2 is characterized in that: The blowing part includes an outer frame; An air blowing cavity is provided inside the outer frame, the air outlet faces the end of the welding portion, an air inlet is provided on a side of the air blowing cavity away from the air outlet, and the air blowing cavity is connected to the air path through the air inlet; The blowing cavity includes an air inlet and an air outlet, wherein the air inlet is connected to the air inlet and is parallel to the welding portion; the air outlet is connected to the air outlet and gradually approaches the welding portion along the direction of the air outlet.

4. The low alloy steel narrow gap all-position butt welding device under preheating conditions according to claim 3 is characterized in that: The blowing part also includes a side plate; The blowing cavity is provided with a side opening, and the side plate is installed to cover the opening of the side opening; The blowing cavity is provided with a plurality of slots along the direction of airflow, each of the slots is provided with a buffer net, and the buffer net is tightly matched with the slot.

5. The low alloy steel narrow gap all-position butt welding device under preheating conditions according to claim 3 is characterized in that: The welding part comprises a welding head, a connecting pipe and a water diversion pipe, wherein the welding head is installed at one end of the connecting pipe and faces the outer wall of the low alloy steel; the other end of the connecting pipe is connected to the base and extends to the periphery of the base; The water guide pipe is inserted into the connecting pipe from an extended portion of the connecting pipe.

6. The low alloy steel narrow gap all-position butt welding device under preheating conditions according to claim 5 is characterized in that: A rotating motor and a rotating gear set are arranged in the base, the rotating motor and the rotating gear set cooperate with each other, and the connecting pipe and the rotating gear set cooperate with each other.

7. The low alloy steel narrow gap all-position butt welding device under preheating conditions according to claim 1 is characterized in that: A sliding opening is provided on one side of the trolley platform facing the welding platform, one end of the adjusting cross bar is inserted into the sliding opening, the adjusting cross bar moves along the sliding opening, a locking knob is provided on one side of the sliding opening, and the locking knob is tightened, so that the adjusting cross bar is fixedly connected to the sliding opening; The surface of the adjusting cross bar is provided with scales, and the scales are arranged along the length direction of the adjusting cross bar.

8. The low alloy steel narrow gap all-position butt welding device under preheating conditions according to claim 1 is characterized in that: The feeding platform is provided with a feeding roller, the feeding roller is arranged on one side of the wire feeding disc, and the feeding roller is driven by a motor; The feeding platform includes a fixing rod, one end of which is connected to the welding platform, the fixing rod is provided with a fixing groove along the direction of the welding assembly, the wire feeding tube is provided with an adjusting screw, and the adjusting screw passes through the fixing groove to fix the wire feeding tube on the fixing rod.

9. A method for butt welding low alloy steel with narrow gaps in all positions under preheating conditions, using a device for butt welding low alloy steel with narrow gaps in all positions under preheating conditions as claimed in any one of claims 1 to 8, characterized in that: Here are the steps: S1, install the annular guide rail on the outer wall of the low alloy steel and tighten it; S2, installing the trolley platform on the annular guide rail for trial welding, and observing whether the welding platform interferes with the outer wall of the low-alloy steel. If there is interference, adjustment is performed until the interference is eliminated; S3, after the trial welding is completed, the trolley platform is removed, and the area of ​​the low-alloy steel outer wall to be welded is preheated, and the preheating temperature needs to be maintained at 150-250℃, and the heating time is not less than 2 hours to reach a uniform temperature; S4, after the temperature is equalized, reinstall the trolley platform on the circular guide rail until the welding is completed.

10. The method for all-position butt welding of low alloy steel with narrow gap under preheating conditions according to claim 9, characterized in that: In S3, if the preheating process is interrupted, the outer wall of the low alloy steel needs to be reheated, the preheating temperature needs to be maintained at 250-400°C, and the heating time is not less than 4 hours to reach a uniform temperature.

Images