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

Abstract

The present application relates to the technical field of welding, and discloses a low-alloy steel narrow-gap all-position butt welding device and welding method under preheating conditions, which comprises a ring guide rail, a trolley platform, a feeding platform and a welding platform. A plurality of ejector rods are arranged on the inner side of the ring guide rail, and the ring guide rail is fixed to the outer wall of the low-alloy steel by the plurality of ejector rods. The trolley platform is driven in cooperation with the ring 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 pipe and a wire feeding disc. The present application ensures the stability and precision of the guide rail during the welding process by adopting the design of the ring guide rail and the ejector rod, thereby improving the overall precision of the welding operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of welding technology, in particular to a low-alloy steel narrow-gap all-position butt welding device and method under preheating conditions. BACKGROUND

[0002] In the process of low-alloy steel manufacturing and repair, outer wall welding is a key technology. However, due to the special shape and position of the low-alloy steel outer wall, the traditional welding method often fails to achieve the desired welding effect. In addition, the welding operation under preheating conditions puts higher requirements on the stability and precision of the equipment. Therefore, a device and method specifically for low-alloy steel outer wall welding under preheating conditions are needed. SUMMARY

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

[0004] The technical solution adopted by the present application 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; the inner side of the annular guide rail is provided with multiple sets of ejector rods, and the annular guide rail is fixed by being tightly pushed against the low-alloy steel outer wall through multiple sets of the ejector rods; the trolley platform is driven in cooperation with the annular guide rail; an adjusting crossbar is provided between the welding platform and the trolley platform, one end of the adjusting crossbar is fixedly connected with the welding platform, and the other end of the adjusting crossbar 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 includes a wire feeding pipe and a wire feeding disc, the wire feeding disc is installed on the trolley platform for storing welding wire, and the wire feeding pipe is arranged on one side of the welding assembly, welding wire is drawn out from the wire feeding disc and passes through the welding assembly for welding operation.

[0005] The main working principle is that the annular guide rail is designed to closely fit the shape of the low alloy steel outer wall, and is fixed to the outer wall by multiple sets of jacks. This design ensures the stability and precision of the guide rail during welding. The jacks provide sufficient support force for the annular guide rail to prevent displacement or deformation during welding. The trolley platform cooperates with the annular guide rail through a driving mechanism (such as a motor, roller, etc.) to enable the trolley platform to move smoothly along the annular guide rail. This design allows welding to be performed at any position on the low alloy steel outer wall, improving the flexibility and coverage of welding. One end of the adjusting crossbar is fixedly connected to the welding platform, and the other end is adjustably connected to the trolley platform. This design allows users to adjust the distance and angle between the welding platform and the low alloy steel outer wall according to actual needs. The welding assembly is provided on the welding platform and faces the low alloy steel outer wall for welding. By adjusting the adjusting crossbar, the welding assembly can maintain a stable posture and position during welding. The feeding platform includes a wire feeding tube and a wire feeding reel, and the wire feeding reel is installed on the trolley platform for storing welding wire. The wire feeding tube is provided on one side of the welding assembly for drawing welding wire from the wire feeding reel and feeding it to the welding assembly. During welding, the welding wire is continuously fed to the welding assembly through the wire feeding tube and is melted and accumulated on the low alloy steel outer wall under the action of the welding assembly to form a welding layer.

[0006] In summary, the working principle of the present application can be summarized as follows: the device is fixed to the low alloy steel outer wall by the annular guide rail and the jacks; the trolley platform moves along the annular guide rail by cooperating with the driving mechanism in the trolley platform, and the feeding platform and the welding platform move along the annular guide rail during the movement of the trolley platform, so that the welding platform can move around the welding position; the position and angle of the welding platform are adjusted by the adjusting crossbar; stable welding wire supply is provided by the feeding platform; finally, the welding of the low alloy steel outer wall is completed under the action of the welding assembly. This design not only improves the precision and efficiency of welding, but also enhances the stability and applicability of the device.

[0007] As a preferred embodiment, the welding assembly comprises a base, a welding part, and a gas blowing part.

[0008] The base is connected to the adjusting crossbar, and the welding part and the gas blowing part are arranged at the front of the base. The working end of the welding part and the working end of the gas blowing part both face the low alloy steel outer wall.

[0009] The welding part passes through the middle of the gas blowing part, and gas outlets are provided on both sides of the gas blowing part. The gas outlets on both sides face the end of the welding part.

[0010] As a preferred embodiment, the gas blowing part comprises an outer frame.

[0011] The outer frame is internally provided with a blowing cavity, the blowing cavity is provided with an air outlet, the air outlet is directed to the end of the welding part, the side of the blowing cavity away from the air outlet is provided with an air inlet, and the blowing cavity is connected with the air path through the air inlet;

[0012] The blowing cavity comprises an air inlet part and an air outlet part, the air inlet part is communicated with the air inlet, and the air inlet part is kept parallel to the welding part; the air outlet part is communicated with the air outlet, and the air outlet part gradually approaches the welding part along the direction of the air outlet.

[0013] As preferred, the blowing part further comprises 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 clamping grooves along the direction of air flow, each clamping groove is provided with a buffer net, and the buffer net is clamped and matched with the clamping groove.

[0016] As preferred, the welding part comprises a welding head, a connecting pipe and a water guide pipe, the welding head is installed at one end of the connecting pipe, and the welding head is directed to the low-alloy steel outer wall; the other end of the connecting pipe is connected with the base and extends to the periphery of the base;

[0017] The water guide pipe is inserted into the connecting pipe from the extension of the connecting pipe.

[0018] As preferred, the periphery of the ring-shaped guide rail is provided with a rack, 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, the driven roller assembly and the driving roller assembly are arranged on the side of the trolley platform directed to the ring-shaped guide rail, and gaps for the ring-shaped guide rail to pass through are arranged between the driving roller assembly and the driven roller assembly; one end of the driving roller assembly is provided with a driving motor, and the surface of the driving roller assembly is provided with a gear, the ring-shaped guide rail passes through the gap between the driving roller assemblies, the gear is engaged with the rack, the ring-shaped guide rail passes through the gap between the driven roller assemblies, and the driven roller assemblies clamp the ring-shaped guide rail.

[0019] As preferred, 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.

[0020] As preferred, the feeding platform comprises a fixing rod, one end of the fixing rod is connected with the welding platform, the fixing rod is provided with a fixing groove along the direction of the welding assembly, an adjusting screw is arranged on the wire feeding pipe, and the adjusting screw passes through the fixing groove to fix the wire feeding pipe on the fixing rod.

[0021] The low-alloy steel narrow-gap all-position butt welding method under preheating conditions comprises the following steps:

[0022] S1, installing the annular guide rail on the low-alloy steel outer wall and tightly fixing it;

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

[0024] S3, after the trial welding is completed, removing the trolley platform and preheating the area of the low-alloy steel outer wall that needs to be welded, and maintaining the preheating temperature at 150-250 DEG C and the heating time at not less than 2 hours to achieve uniform temperature;

[0025] S4, after the uniform temperature is completed, reinstalling the trolley platform on the annular guide rail until the welding is completed.

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

[0027] Compared with the prior art, the low-alloy steel narrow-gap all-position butt welding method under preheating conditions has the following beneficial effects:

[0028] The annular guide rail and the top rod ensure the stability and precision of the guide rail during welding, thereby improving the overall precision of the welding operation. The design of the annular guide rail and the top rod enables the device to closely fit the low-alloy steel outer wall and maintain a stable posture during welding, enhancing the stability of the device. The driving cooperation of the trolley platform with the annular guide rail and the adjustable connection of the adjusting cross bar enable the welding platform to be flexibly adjusted in position and angle according to actual needs, further improving the precision and efficiency of welding. The feeding platform includes a wire feeding pipe and a wire feeding disc, which draws the welding wire from the wire feeding disc and delivers it to the welding assembly through the wire feeding pipe, realizing stable supply of the welding wire. This design ensures the continuity and stability of the welding wire during welding, avoiding welding defects caused by broken or insufficient welding wire.

[0029] In summary, the low-alloy steel narrow-gap all-position butt welding method under preheating conditions has the following significant beneficial effects: improving welding precision and efficiency, enhancing device stability and applicability, realizing stable supply of welding wire, simplifying operation process, and improving welding quality and reliability. These beneficial effects make the present application have wide popularization value and application prospect in industrial applications. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

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

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

[0033] Figure 3 Schematic diagram of the welding platform Figure One ;

[0034] Figure 4 Schematic diagram of the welding platform Figure Two ;

[0035] Figure 5 Schematic diagram of the trolley platform Figure One ;

[0036] Figure 6 Schematic diagram of the trolley platform Figure Two ;

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

[0038] 1, ring guide rail; 10, ejector rod; 11, rack; 2, trolley platform; 20, driving roller assembly; 200, gear hob; 21, driven roller assembly; 22, sliding port; 23, locking knob; 3, feeding platform; 30, wire feeding disc; 31, wire feeding pipe; 32, feeding roller; 33, fixed rod; 34, fixed groove; 35, adjusting screw; 4, welding platform; 40, welding assembly; 400, base; 4000, rotating motor; 4001, rotating gear set; 401, welding part; 4010, welding head; 4011, connecting pipe; 4012, water inlet pipe; 402, air blowing part; 4020, air inlet; 4021, air outlet; 4022, outer frame; 4023, air blowing cavity; 4024, air inlet part; 4025, air blowing part; 4026, side plate; 4027, side port; 4028, clamping groove; 4029, buffer net; 5, adjusting cross rod; 50, scale. DETAILED DESCRIPTION

[0039] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. Many specific details are set forth in the following description to provide a thorough understanding of the present invention; the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort 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 commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0041] Example 1

[0042] This embodiment discloses a device for narrow-gap all-position butt welding of low-alloy steel under preheating conditions, such as... Figures 1-7 As shown, the system includes: a ring guide rail 1, a trolley platform 2, a feeding platform 3, and a welding platform 4. The ring guide rail 1 has multiple sets of push rods 10 on its inner side, and is fixed to the low-alloy steel outer wall by these push rods 10. The trolley platform 2 is driven to cooperate with the ring guide rail 1. An adjusting crossbar 5 is provided between the welding platform 4 and the trolley platform 2; one end of the adjusting crossbar 5 is fixedly connected to the welding platform 4, and the other end is adjustablely connected to the trolley platform 2. The welding platform 4 has a welding assembly 40 facing the low-alloy steel outer wall. The feeding platform 3 includes a wire feeding tube 31 and a wire feeding reel 30. The wire feeding reel 30 is installed on the trolley platform 2 to store welding wire. The wire feeding tube 31 is located on one side of the welding assembly 40, and the welding wire is drawn from the wire feeding reel 30 and passes through the welding assembly 40 for welding operations. The ring guide rail 1 is tightly fitted and fixed to the low-alloy steel outer wall by the multiple sets of push rods 10, ensuring the stability of the device during the welding process.

[0043] The trolley platform 2, driven by the annular guide rail 1, can move freely along the guide rail, facilitating welding operations. The welding platform 4, connected to the trolley platform 2 via the adjusting crossbar 5, allows for flexible adjustment of the position and angle of the welding assembly 40, ensuring welding accuracy and efficiency. The feeding platform 3, including the wire feeding tube 31 and the wire feeding reel 30, achieves a continuous and stable supply of welding wire, ensuring smooth welding operations. This structure is compact and easy to operate, significantly improving the efficiency and accuracy of welding operations. 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 feeding platform 3 enables automated wire supply, reducing manual intervention and improving work efficiency.

[0044] In some optional embodiments, the welding assembly comprises a base, a welding part and a blowing part. The base is connected with the adjusting crossbar by bolts to ensure stability. The welding part and the blowing part are both arranged at the front of the base. The working end of the welding part is a welding gun head, and the working end of the blowing part is a blowing nozzle, both of which are directed towards the outer wall of the low alloy steel. The welding part passes through the middle of the blowing part. The blowing part is provided with gas outlets on both sides, which are directed towards the welding gun head and used to blow away welding fume and cool the weld during welding.

[0045] In some optional embodiments, the blowing part comprises 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 welding. The blowing cavity is provided with gas outlets and gas inlets. The gas inlets are connected with the gas path through gas pipes to provide the gas required for blowing. The blowing cavity is divided into an inlet part and an outlet part. The inlet part is in communication with the gas inlets and is parallel to the welding part to ensure that the gas flows uniformly. The outlet part is in communication with the gas outlets and gradually approaches the welding part along the direction of the gas outlets. This arrangement can break the continuity of the gas flow in the blowing cavity, so that the gas flow will not converge to form a concentrated gas flow when it is discharged from the gas outlets, making the gas flow more gentle and improving the blowing effect.

[0046] In some optional embodiments, the blowing cavity is provided with three clamping grooves along the direction of the gas flow, and each clamping groove is provided with a buffer net. The buffer net is made of high-temperature-resistant and corrosion-resistant material to filter impurities in the gas flow and further prevent the gas flow from being too concentrated in a local area. The buffer net is connected with the clamping groove through clamping fit, and can be conveniently replaced.

[0047] In some optional embodiments, the welding part comprises a welding head, a connecting pipe and a water guide pipe. The welding head is installed at one end of the connecting pipe and used for welding operation. The other end of the connecting pipe is connected with the base through screw connection and extends to the periphery of the base, which is convenient for connecting with external welding power supply and cooling water source. The water guide pipe is inserted into the connecting pipe from the extension 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, which is used to provide cooling water for the welding head during welding to prevent the welding head from overheating and being damaged.

[0048] In some optional embodiments, the base is provided with a rotating motor and a rotating gear set. The rotating motor is connected with the external power supply through wires to provide driving force. The rotating gear set cooperates with the rotating motor to realize the rotating movement of the welding part. The connecting pipe is connected with the rotating gear set through key connection or spline connection to ensure that the connecting pipe will not loosen or fall off during rotation.

[0049] In some alternative embodiments, the ring-shaped guide rail 1 is provided with a rack 11, 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 ring-shaped guide rail 1, and gaps are arranged between the driving roller assembly 20 and the driven roller assembly 21 for the ring-shaped guide rail 1 to pass through; one end of the driving roller assembly 20 is provided with a driving motor, and the surface of the driving roller assembly 20 is provided with a gear rack 200, the ring-shaped guide rail 1 passes through the gap between the driving roller assembly 20, the gear rack 200 and the rack 11 are engaged with each other, the ring-shaped guide rail 1 passes through the gap between the driven roller assembly 21, and the driven roller assembly 21 clamps the ring-shaped guide rail 1.

[0050] Specifically, as shown in the figure, Figure 7 the ring-shaped guide rail 1 is provided with a rack 11 which is engaged with the gear rack 200 of the driving roller assembly 20 on the trolley platform 2, so as to realize the accurate driving of the trolley platform 2 on the ring-shaped guide rail 1. The driven roller assembly 21 and the driving roller assembly 20 are arranged in parallel and clamp the ring-shaped guide rail 1, further enhancing the stability of the trolley platform 2 during movement.

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

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

[0053] Firstly, the device is fixed to the low-alloy steel outer wall by the ring-shaped guide rail 1 and the plurality of ejector rods 10, ensuring the stability during the welding process. The ring-shaped guide rail 1 is provided with a rack 11 which is engaged with the gear rack 200 of the driving roller assembly 20 on the trolley platform 2, so as to realize the accurate driving of the trolley platform 2 on the ring-shaped guide rail 1. The trolley platform 2 and the welding platform 4 are connected through the adjusting cross rod 5, one end of the adjusting cross rod 5 is fixed to the welding platform 4, the other end is inserted into the sliding port 22 of the trolley platform 2 and can move along the sliding port 22. By adjusting the position of the adjusting cross rod 5 in the sliding port 22 and using the locking knob 23 to fix it, the position of the welding platform 4 can be coarsely adjusted. The surface of the adjusting cross rod 5 is provided with a scale 50, which is convenient for accurate 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 with the adjusting cross rod 5, the welding part 401 and the blowing part 4025402 are stably arranged at the front of the base 400, and the working ends of the welding part 401 and the blowing part 4025402 are both towards the low alloy steel outer wall.

[0055] When starting welding, the welding part 401 passes through the middle of the blowing part 4025402, the blowing part 4025402 is provided with gas outlets 4021 on both sides, the gas outlets 4021 are towards the ends of the welding part 401, so as to provide gas protection during welding, and avoid overheating of the welding part 401.

[0056] The blowing part 4025402 includes an outer frame 4022 and an internally arranged blowing cavity 4023, the blowing cavity 4023 is provided with an air inlet 4020 away from the side of the gas outlet 4021, the air inlet 4020 is connected with the gas path, so as to ensure that the gas can smoothly enter the blowing cavity 4023. The blowing cavity 4023 is divided into an air inlet part 4024 and an air outlet part, the air inlet part 4024 is communicated with the air inlet 4020 and keeps parallel with the welding part 401; the air outlet part is communicated with the gas outlet 4021, and gradually approaches the welding part 401 along the direction of the gas outlet 4021, this setting can destroy the continuity of the gas flow in the blowing cavity 4023, so that the gas flow is not gathered to form a gathered gas flow when it is discharged from the gas outlet 4021, the gas flow is more gentle, and the blowing effect is improved.

[0057] The side plate 4026 is installed at the side opening 4027 of the blowing cavity 4023, so as to prevent gas leakage, a plurality of clamping grooves 4028 are arranged along the direction of the gas flow in the blowing cavity 4023, one buffer net 4029 is installed in each clamping groove 4028, so as to slow down the gas flow speed and uniformly 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 low-alloy steel outer wall, 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, facilitating connection with 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, used to provide cooling water during welding to protect the welding head 4010 and the connecting pipe 4011 from high temperature damage. The feeding platform 3 includes a wire feeding pipe 31 and a wire feeding reel 30. The wire feeding reel 30 is installed on the trolley platform 2 and used to store welding wire. The wire feeding pipe 31 is arranged on one side of the welding assembly 40. The welding wire is drawn 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 used to continuously draw welding wire from the wire feeding reel 30. The fixing rod 33 is connected to the welding platform 4 at one end and provided with a fixing groove 34 at the other end. The wire feeding pipe 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 pipe 31 can be finely adjusted to ensure that the welding wire is accurately fed 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 low-alloy steel outer wall through the cooperation of the ring guide rail 1, the trolley platform 2, the feeding platform 3, and the welding platform 4. By adjusting the adjusting cross rod 5, the multi-stage sliding mechanism of the welding platform 4, and the fixing rod 33 of the feeding platform 3, 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, thereby meeting various complex welding requirements.

[0060] Example 2

[0061] The low-alloy steel narrow-gap all-position butt welding method under preheating conditions applies any of the low-alloy steel narrow-gap all-position butt welding devices under preheating conditions described above. The steps are as follows:

[0062] S1, install the ring guide rail 1 on the low-alloy steel outer wall and tighten and fix it;

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

[0064] S3, after the trial welding is completed, remove the trolley platform 2 and preheat the area of the low-alloy steel outer wall that needs to be welded. The preheating temperature needs to be maintained at 150-250°C, and the heating time needs to be at least 2 hours to achieve uniform temperature;

[0065] S4, after the temperature is uniform, 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 low-alloy steel outer wall needs to be reheated, the preheating temperature needs to be maintained at 250-400 DEG C, and the heating time is not less than 4 hours to achieve temperature uniformity.

[0067] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any modification, equivalent change and modification of the above embodiment based on the technical essence of the present application, without departing from the technical solution content of the present application, still belongs to the scope of the technical solution of the present application.

Claims

1. A low-alloy steel narrow-gap all-position butt welding device in a preheating working condition, characterized in that, The device comprises a ring-shaped 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 ring-shaped guide rail, and the ring-shaped guide rail is fixed to the outer wall of the low-alloy steel by the plurality of sets of ejector rods. 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 pipe and a wire feeding disc, the wire feeding disc is installed on the trolley platform for storing welding wire, the wire feeding pipe is arranged on one side of the welding assembly, and the welding wire is drawn out from the wire feeding disc and passes through the welding assembly for welding operation. 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 part of the base, and the working end of the welding part and the working end of the blowing part both face the outer wall of the low-alloy steel. The welding part passes through the middle part of the blowing part, and the blowing part is provided with gas outlets on both sides, and the gas outlets on both sides face the end part of the welding part. The blowing part comprises an outer frame. An air blowing cavity is arranged in the outer frame, the gas outlets face the end part of the welding part, the air blowing cavity is provided with air inlets on the side away from the gas outlets, and the air blowing cavity is connected to the air path through the air inlets. The air blowing cavity comprises an air inlet part and an air outlet part, the air inlet part is communicated with the air inlets, and the air inlet part is parallel to the welding part; the air outlet part is communicated with the air outlets, and the air outlet part gradually approaches the welding part along the direction of the air outlets. The blowing part further comprises a side plate. The air blowing cavity is provided with side openings, and the side plate is installed to cover the openings of the side openings. The air blowing cavity is provided with a plurality of clamping grooves along the direction of air flow, each clamping groove is provided with a buffer net, and the buffer net is clamped with the clamping groove.

2. The low-alloy steel narrow-gap all-position butt welding device under preheating working condition according to claim 1, wherein The welding part comprises a welding head, a connecting pipe and a water guide pipe, 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. The water guide pipe is inserted into the connecting pipe from the extension of the connecting pipe.

3. The low-alloy steel narrow-gap all-position butt welding device under preheating working condition according to claim 2, wherein A rotating motor and a rotating gear set are arranged in the base, the rotating motor and the rotating gear set are matched with each other, and the connecting pipe and the rotating gear set are matched with each other.

4. The low-alloy steel narrow-gap all-position butt welding device under preheating working condition according to claim 1, wherein The side of the trolley platform facing the welding platform is provided with a sliding opening, one end of the adjusting cross rod is inserted into the sliding opening, the adjusting cross rod moves along the sliding opening, one side of the sliding opening is provided with a locking knob, and the locking knob is tightened to fix the adjusting cross rod and the sliding opening. The surface of the adjusting cross rod is provided with a scale, and the scale is arranged along the length direction of the adjusting cross rod.

5. The low-alloy steel narrow-gap full-position butt welding device under preheating working condition according to claim 1, 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 comprises a fixed rod, one end of the fixed rod is connected with the welding platform, the fixed rod is provided with a fixed groove along the direction of the welding assembly, the wire feeding pipe is provided with an adjusting screw, and the adjusting screw passes through the fixed groove to fix the wire feeding pipe on the fixed rod.

6. A method for butt welding of low alloy steel in narrow gap and all position under preheating condition, using the apparatus for butt welding of low alloy steel in narrow gap and all position under preheating condition according to any one of claims 1 to 5, characterized in that, The steps are as follows: S1, install the annular guide rail on the low-alloy steel outer wall and tighten and fix it; S2, install the trolley platform on the annular guide rail for trial welding, observe whether the welding platform interferes with the low-alloy steel outer wall, if there is interference, adjust until the interference is eliminated; S3, after trial welding, remove the trolley platform, and preheat the area to be welded on the low-alloy steel outer wall, and the preheating temperature needs to be maintained at 150-250 DEG C, and the heating time is not less than 2 hours to achieve uniform temperature; S4, after uniform temperature, reinstall the trolley platform on the annular guide rail until the welding is completed.

7. The low-alloy steel narrow-gap full-position butt welding method under preheating working condition according to claim 6, characterized in that, In S3, if the preheating process is interrupted, the low-alloy steel outer wall needs to be reheated, the preheating temperature needs to be maintained at 250-400 DEG C, and the heating time is not less than 4 hours to achieve uniform temperature.

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