A welding device and method for welding a fillet weld of a thin-walled small-bore pipe

Abstract

The present application is suitable for pipeline welding technical field, especially relates to a kind of fillet weld welding device and method of thin-wall small-bore pipe, the device includes: base and conveying mechanism;Base is equipped with lifting mechanism, lifting mechanism is equipped with lifting seat, lifting seat is equipped with clamping mechanism;Lifting seat is fixedly installed with fixed guide ring, a group of sliding tooth rings are slidably arranged on fixed guide ring, first welding mechanism and second welding mechanism are respectively installed at the both ends of sliding tooth ring, distance sensor is installed on first welding mechanism and second welding mechanism, sixth motor is fixedly installed on lifting seat, first gear is fixedly installed on the output shaft of sixth motor, and first gear is engaged with sliding tooth ring.The present application is pre-cut according to the size of base pipe to the pipe to be welded, so that the end of the pipe to be welded can be fitted with the outer edge of the base pipe, so as to facilitate welding, automatic welding can be realized by two groups of welding mechanism, the stability of weld is guaranteed, and product quality is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of pipeline welding, and particularly relates to a fillet weld welding device and method for a thin-walled small-diameter pipe. BACKGROUND

[0002] Fillet welding is a common welding process, mainly used for connecting the edges of two mutually perpendicular or nearly perpendicular workpieces. In this welding process, the weld is formed at the junction of two materials and is distributed along the joint line, usually presenting a triangular cross-sectional shape. Fillet welding not only provides good structural support, but also enhances the overall strength and stability of the connected components. This welding method is widely used in construction, bridge manufacturing, shipbuilding, and the production of various metal structures.

[0003] During production, thin-walled small-diameter pipes often have uneven welds and poor welding stability during manual welding due to their characteristics, affecting product use. SUMMARY

[0004] The purpose of the present application is to provide a fillet weld welding device for a thin-walled small-diameter pipe, which aims to solve the problem of uneven welds and poor welding stability during manual welding, affecting product use.

[0005] The present application is implemented as follows: a fillet weld welding device for a thin-walled small-diameter pipe, the device comprising:

[0006] A base is provided, and a conveying mechanism is installed on the base for conveying the base pipe;

[0007] A lifting mechanism is installed on the base through a support, a lifting seat is installed on the lifting mechanism, a clamping mechanism is installed on the lifting seat, and the clamping mechanism is used to clamp the pipe to be welded;

[0008] A fixed guide ring is fixedly installed on the lifting seat, a set of sliding tooth rings are slidingly arranged on the fixed guide ring, first and second welding mechanisms are installed at both ends of the sliding tooth rings, distance sensors are installed on the first and second welding mechanisms, a sixth motor is fixedly installed on the lifting seat, a first gear is fixedly installed on the output shaft of the sixth motor, and the first gear is engaged with the sliding tooth ring.

[0009] Preferably, the first welding mechanism and the second welding mechanism each comprise a set of guide cylinders, a fourth motor is fixedly installed on the guide cylinder, a second screw is fixedly connected to the output shaft of the fourth motor, a guide block is slidably arranged in the guide cylinder, a position avoiding groove is arranged below the guide cylinder, the guide block slides along the position avoiding groove, a first telescopic rod and a second telescopic rod are rotatably connected to the guide block, a lifting ring and a guide ring are rotatably connected to the telescopic ends of the first telescopic rod and the second telescopic rod respectively, a first welding gun and a second welding gun are fixedly connected to the two sets of lifting rings respectively, the two sets of guide rings are slidably connected with the first welding gun and the second welding gun respectively, and a distance sensor is fixedly installed on the guide cylinder.

[0010] Preferably, the conveying mechanism comprises a first sliding seat, a second screw is rotatably installed on the base, the second screw is connected with the first sliding seat through threads, a first guide rod is arranged on the base, the first guide rod is slidably connected with the base, a plurality of sets of mounting seats are fixedly installed on the first sliding seat, two sets of rollers are rotatably installed on the mounting seats, the two sets of rollers are arranged in the same plane, one set of the rollers is driven by a first motor, and the two sets of rollers are arranged in a V shape.

[0011] Preferably, the lifting mechanism comprises a sliding block, a plurality of sets of second guide rods are fixedly arranged on the support, a plurality of sets of sliding blocks are arranged, the sliding blocks are fixedly installed on the lifting seat, the sliding blocks are slidably connected with the second guide rods, two sets of first screws are rotatably arranged on the support, the first screws are connected with the lifting seat through threads, a belt wheel is fixedly installed at the end of the first screw, the two sets of belt wheels are connected through a transmission belt, one set of the first screws is driven by a second motor, and the second motor is fixedly installed on the support.

[0012] Preferably, the clamping mechanism comprises a first clamping arm and a second clamping arm, two sets of guide sleeves are fixedly arranged on the lifting seat, two sets of third guide rods are slidably arranged in the two sets of guide sleeves respectively, the two sets of third guide rods are fixedly connected with the first clamping arm and the second clamping arm respectively, a rack is fixedly installed on the first clamping arm and the second clamping arm, a second gear is rotatably arranged on the lifting seat, the second gear is meshed with the two sets of racks at the same time, the second gear is driven by a fifth motor fixedly installed on the lifting seat, a set of mounting plates are installed on the first clamping arm and the second clamping arm, a plurality of sets of electromagnets are fixedly installed on the mounting plates, the mounting plates are fixedly connected with clamping pieces through connecting blocks, and a plurality of magnetic blocks are fixedly arranged on the side of the clamping pieces close to the mounting plates.

[0013] Preferably, the clamping piece is provided with an anti-skid layer.

[0014] Another object of the present application is to provide a fillet welding method for a thin-walled small-bore pipe, which is applied to the fillet welding device for a thin-walled small-bore pipe as described above, and the method comprises the following steps:

[0015] The base pipe is placed on the conveying mechanism, the distance sensor is moved through the movement of the clamping mechanism, modeling is performed according to detection data of the distance sensor, and the size of the base pipe is determined;

[0016] The pipe to be welded is clamped by the clamping mechanism, the pipe to be welded is pre-cut according to the size of the base pipe, and the pretreated pipe to be welded is obtained;

[0017] The pipe to be welded is welded by the first welding mechanism and the second welding mechanism at the same time, and the welding operation is completed.

[0018] The thin-wall small-diameter pipe corner weld welding device provided by the application can automatically identify the size of the base pipe through the distance sensor, pre-cut the pipe to be welded according to the size of the base pipe, make the end of the pipe to be welded fit the outer edge of the base pipe, facilitate welding, and realize automatic welding through the two groups of welding mechanisms, thereby guaranteeing the stability of the weld and improving product quality. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The first perspective view of the thin-wall small-diameter pipe corner weld welding device is provided.

[0020] Figure 2 The second perspective view of the thin-wall small-diameter pipe corner weld welding device is provided.

[0021] Figure 3 The third perspective view of the thin-wall small-diameter pipe corner weld welding device is provided.

[0022] Figure 4 The Figure 1 The local enlarged view of A in FIG.

[0023] Figure 5 The Figure 3 The local enlarged view of B in FIG.

[0024] In the drawings: 1, base; 2, second screw; 3, first sliding seat; 4, mounting seat; 5, roller; 6, first motor; 7, support; 8, second motor; 9, transmission belt; 10, pulley; 11, first screw; 12, lifting seat; 13, sliding block; 14, second guide rod; 15, mounting plate; 16, clamping piece; 17, electromagnet; 18, magnetic block; 19, first clamping arm; 20, second clamping arm; 21, guide sleeve; 22, third guide rod; 23, third motor; 24, first welding gun; 25, second welding gun; 26, first telescopic rod; 27, second telescopic rod; 28, fourth motor; 29, guide cylinder; 30, fixed guide ring; 31, sliding gear ring; 32, fifth motor; 33, sixth motor; 34, first gear; 35, distance sensor. DETAILED DESCRIPTION

[0025] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0026] The specific implementation of the present application is described in detail below with reference to specific embodiments.

[0027] As shown in Figure 1 , Figure 2 and Figure 3 , a kind of fillet weld welding device of thin-wall small-bore pipe provided by an embodiment of the present application, the device comprises:

[0028] Base 1, conveying mechanism is installed on base 1, conveying mechanism is used to convey base pipe;

[0029] Lifting mechanism is installed on base 1 by support 7, lifting mechanism is installed on lifting seat 12, clamping mechanism is installed on lifting seat 12, clamping mechanism is used to clamp the pipe to be welded;

[0030] Fixedly installed with fixed guide ring 30 on lifting seat 12, a group of sliding tooth rings 31 are slidably arranged on fixed guide ring 30, first welding mechanism and second welding mechanism are respectively installed at both ends of sliding tooth ring 31, distance sensor 35 is installed on first welding mechanism and second welding mechanism, sixth motor 33 is fixedly installed on lifting seat 12, first gear 34 is fixedly installed on the output shaft of sixth motor 33, and first gear 34 is engaged with sliding tooth ring 31.

[0031] In the embodiment of the present application, when welding, the base pipe is placed on the conveying mechanism, the conveying mechanism is used to control the base pipe to move along the axis or perpendicular to the axis in the horizontal plane, the pipe to be welded is placed in the clamping mechanism, the diameter of the pipe to be welded is detected by the clamping mechanism, the distance sensor 35 is controlled to scan the surface of the base pipe, so as to determine the diameter of the base pipe according to the scanning result, after determining the diameter of the base pipe and the diameter of the pipe to be welded, the end of the pipe to be welded is cut, so that the end of the pipe to be welded is fitted with the outer wall of the base pipe, then the first gear 34 is driven to rotate by the sixth motor 33, the first gear 34 is engaged with the sliding tooth ring 31, the sliding tooth ring 31 slides along the fixed guide ring 30 to drive the first welding mechanism and the second welding mechanism to rotate around the pipe to be welded, so as to weld along the contact line of the pipe to be welded and the base pipe.

[0032] As shown in Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, as a preferred embodiment of the present application, the first welding mechanism and the second welding mechanism each comprises a set of guide cylinders 29, a fourth motor 28 is fixedly installed on the guide cylinder 29, a second screw is fixedly connected to the output shaft of the fourth motor 28, a guide block is slidingly arranged in the guide cylinder 29, an avoiding groove is arranged below the guide cylinder 29, the guide block slides along the avoiding groove, a first telescopic rod 26 and a second telescopic rod 27 are rotatably connected to the guide block, a lifting ring and a guide ring are rotatably connected to the telescopic ends of the first telescopic rod 26 and the second telescopic rod 27 respectively, a first welding torch 24 and a second welding torch 25 are fixedly connected to the two sets of lifting rings respectively, the two sets of guide rings are slidingly connected with the first welding torch 24 and the second welding torch 25 respectively, and a distance sensor 35 is fixedly installed on the guide cylinder 29.

[0033] In the embodiment, when welding is performed, the first welding mechanism and the second welding mechanism can both perform welding, the fixed guide ring 30 is an incomplete ring, the included angle between the center of the circle and the line connecting the two ends of the circle is greater than 180 degrees, and a guide groove is formed on the top surface, the sliding tooth ring 31 is an incomplete ring, the included angle between the center of the circle and the line connecting the two ends of the circle is greater than 200 degrees, the first welding mechanism and the second welding mechanism are fixed at the two ends of the sliding tooth ring 31 respectively, the sliding tooth ring 31 is slidingly arranged in the guide groove, the guide cylinder 29 is fixedly installed on the sliding tooth ring 31, the guide cylinder 29 is a hollow structure, a guide block is slidingly installed in the guide cylinder 29, a protrusion is arranged at the bottom of the guide block, an avoiding groove is arranged below the guide cylinder 29, the protrusion slides in the avoiding groove, after the fourth motor 28 is started, the guide block will be driven to slide in the guide cylinder 29, the guide block is rotatably connected with the first telescopic rod 26 and the second telescopic rod 27 through the protrusion, a lifting ring and a guide ring are rotatably connected to the first telescopic rod 26 and the second telescopic rod 27 respectively, the lifting ring in the first welding mechanism is fixedly connected with the first welding torch 24, the lifting ring in the second welding mechanism is fixedly connected with the second welding torch 25, the guide ring in the first welding mechanism is slidingly connected with the first welding torch 24, and the guide ring in the second welding mechanism is slidingly connected with the second welding torch 25, then under the cooperation of the first telescopic rod 26 and the second telescopic rod 27, the first welding torch 24 and the second welding torch 25 can be driven to lift and adjust the welding angle of the welding torch, by cooperating with the fourth motor 28, the position of the welding point can be changed to match the edge of the pipe to be welded, and the welding quality is ensured.

[0034] As shown in the drawings, Figure 1 , Figure 2 and Figure 3As shown, in a preferred embodiment of the present invention, the conveying mechanism includes a first slide block 3, a second screw 2 rotatably mounted on a base 1, the second screw 2 being connected to the first slide block 3 by a thread, a first guide rod being provided on the base 1, the first guide rod being slidably connected to the base 1, a plurality of mounting seats 5 being fixedly mounted on the first slide block 3, and two sets of rollers 5 being rotatably mounted on the mounting seats 5, the two sets of rollers 5 being arranged in the same plane, one set of rollers 5 being driven by a first motor 6, and the two sets of rollers 5 being arranged in a V-shape.

[0035] In this embodiment, when it is necessary to control the base tube to move along the axis in the horizontal plane, the first motor 6 is started, and the first motor 6 drives part of the roller 5 to rotate, thereby realizing the axial conveying of the base tube. When it is necessary to control the base tube to move perpendicular to the axis in the horizontal plane, the motor used to drive the second screw 2 is started, which is defined as the seventh motor. When the second screw 2 rotates, the first slide 3 slides along the first guide rod, thereby realizing the movement of the base tube.

[0036] like Figure 1 , Figure 2 and Figure 3 As shown, in a preferred embodiment of the present invention, the lifting mechanism includes a slider 13, a plurality of second guide rods 14 are fixedly arranged on the bracket 7, a plurality of sliders 13 are arranged, the sliders 13 are fixedly installed on the lifting seat 12, the sliders 13 are slidably connected to the second guide rods 14, and two sets of first screws 11 are rotatably arranged on the bracket 7. The first screws 11 are connected to the lifting seat 12 by threads, and pulleys 10 are fixedly installed at the ends of the first screws 11. The two sets of pulleys 10 are connected by a transmission belt 9, and one set of first screws 11 is driven by a second motor 8, which is fixedly installed on the bracket 7.

[0037] In this embodiment, when it is necessary to control the lifting seat 12 to rise or fall, the second motor 8 is started, which drives the pulleys 10 to rotate. The pulleys 10 are connected by a transmission belt 9, so the pulleys 10 will rotate synchronously to drive the two sets of first screws 11 to rotate synchronously, thereby controlling the lifting seat 12 to rise or fall. The lifting stability of the lifting seat 12 can be ensured by setting the second guide rod 14.

[0038] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown in the drawings, as a preferred embodiment of the present application, the clamping mechanism comprises a first clamping arm 19 and a second clamping arm 20, and two sets of guide sleeves 21 are fixedly arranged on the lifting seat 12, and two sets of third guide rods 22 are slidably arranged in the two sets of guide sleeves 21 respectively, and the two sets of third guide rods 22 are fixedly connected with the first clamping arm 19 and the second clamping arm 20 respectively, and a rack is fixedly installed on each of the first clamping arm 19 and the second clamping arm 20, and a second gear is rotatably arranged on the lifting seat 12, and the second gear is engaged with the two racks at the same time, and the second gear is driven by a fifth motor 32 fixedly installed on the lifting seat 12, and a mounting plate 15 is installed on each of the first clamping arm 19 and the second clamping arm 20, and a plurality of electromagnets 17 are fixedly installed on the mounting plate 15, and the mounting plate 15 is fixedly connected with a clamping piece 16 through a connecting block, and a plurality of magnetic blocks 18 are fixedly arranged on the side of the clamping piece 16 close to the mounting plate 15.

[0039] As shown in the drawings, Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown in the drawings, as a preferred embodiment of the present application, the clamping piece 16 is provided with an anti-skid layer.

[0040] In this embodiment, when it is necessary to clamp the pipe to be welded, it is placed in the core of the fixed guide ring 30, at this time the fifth motor 32 is started, the second gear is driven to rotate by the fifth motor 32, the second gear is engaged with the two racks, thereby driving the first clamping arm 19 and the second clamping arm 20 to move close to each other, at this time the third guide rod 22 slides in the guide sleeve 21, and the two mounting plates 15 move close to each other, a pressure sensor is arranged on the surface of the clamping piece 16, which is used to detect whether it contacts the pipe to be welded, when the pressure values detected by the pressure sensors on the two clamping pieces 16 both reach a preset value, the two mounting plates 15 stop moving, at this time the electromagnets 17 are energized, the magnetic field generated by the electromagnets 17 repels the magnetic blocks on the clamping piece 16, so that the clamping piece 16 is attached to the outer wall of the pipe to be welded, to form a horizontal clamping effect, by changing the magnetic field strength, the clamping force can be changed, so as to avoid causing the pipe to be welded to be deformed.

[0041] In an embodiment of the present application, a thin-walled small-diameter pipe fillet welding method is provided, which is applied to the thin-walled small-diameter pipe fillet welding device as described above, and the method comprises:

[0042] The base pipe is placed on the conveying mechanism, the distance sensor 35 is moved by the movement of the clamping mechanism, and the size of the base pipe is determined according to the detection data of the distance sensor 35.

[0043] In the step, the base pipe is placed between the rollers 5, and the rotation of the rollers 5 can control the movement of the base pipe along the axis, at this time, the sliding gear ring 31 is controlled to rotate along the fixed guide ring 30, and the two groups of distance sensors 35 will measure the distance of the base pipe below, at this time, the rotation axis of the sliding gear ring 31 is perpendicular to and intersects with the axis of the base pipe, and the two groups of distance sensors 35 will make a circular motion, and the detection points of the distance sensors 35 on the base pipe will form a line of intersection, in a three-dimensional coordinate system, taking the rotation center of the distance sensor 35 as the origin, and taking each group of measurement values as three-dimensional coordinate markers in the coordinate system, a set of line intersection curves are formed in the three-dimensional coordinate system, and the diameter of the base pipe is calculated according to the line intersection curves, specifically, a model of the base pipe can also be constructed in the three-dimensional coordinate system, assuming that the axis is the Z axis and the center is at the origin, and the equation is:

[0044] x 2 +y 2 =R A 2

[0045] Wherein, R A is the diameter of the base pipe,;

[0046] The path of the distance sensor 35 is projected downward to form a projection cylinder, which is defined as a projection pipe, and the radius of the projection pipe is R B , which is a known value, and the axis is assumed to be the X axis and the center is at the origin, and the equation is:

[0047] z 2 +y 2 =R B 2

[0048] The line of intersection is formed by the intersection of the projection pipe and the base pipe, and (x, y, z) represents a point in the three-dimensional coordinate system, and the coordinates of each point on the line of intersection can be determined according to the plane where the distance sensor 35 is located. Since the line of intersection exists on both the base pipe and the projection pipe, it will satisfy the above two equations at the same time, and the coordinates of the line of intersection are substituted into the above two equations one by one to obtain the radius R A of the base pipe.

[0049] The to-be-welded pipe is clamped by the clamping mechanism, and the to-be-welded pipe is pre-cut according to the size of the base pipe to obtain a pretreated to-be-welded pipe.

[0050] The first welding mechanism and the second welding mechanism are used to weld the to-be-welded pipe at the same time to complete the welding work.

[0051] In the step, the pipe to be welded is placed in the clamping mechanism and clamped by the clamping mechanism. When the pipe to be welded is placed, the end of the pipe to be welded abuts against the upper surface of the base pipe. The middle part of the clamping piece 16 is provided with a V-shaped positioning groove for keeping the pipe to be welded in a vertical state. At this time, the axis of the pipe to be welded is perpendicular to the axis of the base pipe. The diameter of the pipe to be welded is determined according to the moving distance of the mounting plate 15 (converted according to the running number of the fifth motor 32). Since the pipe to be welded and the base pipe are perpendicular to each other, the shape of the weld between them is the same as the intersection line between them. The shape of the intersection line is determined according to the size of the pipe to be welded and the base pipe, so as to control the first welding gun 24 and the second welding gun 25 to cut the pipe to be welded synchronously, so that the section of the pipe to be welded can be fitted with the base pipe. After the size of the base pipe is determined, the two groups of welding guns move to the lowest position, i.e. contact with the upper surface of the base pipe. At this time, the welding point is at the same height as the pipe to be welded. The pipe to be welded is cut by the welding gun. In this process, the two groups of welding guns are controlled to rotate and lift according to the calculated intersection line, so as to complete the cutting of the pipe to be welded. After cutting is completed, the pipe to be welded is moved downward so as to abut against the base pipe. Then, the pipe to be welded and the base pipe are welded again according to the intersection line therebetween.

[0052] When the pipe to be welded is cut, the base pipe is controlled to move in the horizontal plane along the radial direction, so as to avoid that the waste generated by cutting falls on the base pipe and affects the subsequent welding.

[0053] The above only describes the preferred embodiments of the present application and should not be used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A thin-walled small-bore tube corner weld welding device characterized by comprising: The device comprises: The base (1) is provided with a conveying mechanism for conveying the base pipe; The base (1) is provided with a lifting mechanism through a support (7), the lifting mechanism is provided with a lifting seat (12), the lifting seat (12) is provided with a clamping mechanism for clamping the pipe to be welded; The lifting seat (12) is fixedly provided with a fixed guide ring (30), a plurality of sliding tooth rings (31) are slidably arranged on the fixed guide ring (30), the two ends of the sliding tooth ring (31) are respectively provided with a first welding mechanism and a second welding mechanism, the first welding mechanism and the second welding mechanism are both provided with a distance sensor (35), the lifting seat (12) is fixedly provided with a sixth motor (33), the output shaft of the sixth motor (33) is fixedly provided with a first gear (34), and the first gear (34) is engaged with the sliding tooth ring (31); The first welding mechanism and the second welding mechanism each comprise a plurality of guide cylinders (29), the guide cylinders (29) are fixedly provided with a fourth motor (28), the output shaft of the fourth motor (28) is fixedly connected with a second screw rod, a guide block is slidably arranged in the guide cylinder (29), a position avoiding groove is arranged below the guide cylinder (29), the guide block slides along the position avoiding groove below, the guide block is rotatably connected with a first telescopic rod (26) and a second telescopic rod (27), the telescopic ends of the first telescopic rod (26) and the second telescopic rod (27) are rotatably connected with a lifting ring and a guide ring, respectively, two groups of lifting rings are fixedly connected with a first welding gun (24) and a second welding gun (25), respectively, and two groups of guide rings are slidably connected with the first welding gun (24) and the second welding gun (25), respectively, the guide cylinder (29) is fixedly provided with a distance sensor (35); The clamping mechanism comprises a first clamping arm (19) and a second clamping arm (20), the lifting seat (12) is fixedly provided with two groups of guide sleeves (21), two groups of third guide rods (22) are slidably arranged in the two groups of guide sleeves (21), respectively, the two groups of third guide rods (22) are fixedly connected with the first clamping arm (19) and the second clamping arm (20), respectively, the first clamping arm (19) and the second clamping arm (20) are both fixedly provided with a rack, the lifting seat (12) is rotatably provided with a second gear, the second gear is engaged with the two groups of racks at the same time, the second gear is driven by a fifth motor (32) fixedly arranged on the lifting seat (12), the first clamping arm (19) and the second clamping arm (20) are both provided with a group of mounting plates (15), a plurality of electromagnets (17) are fixedly arranged on the mounting plates (15), the mounting plates (15) are fixedly connected with a clamping piece (16) through a connecting block, and a plurality of magnetic blocks (18) are fixedly arranged on the side of the clamping piece (16) close to the mounting plates (15).

2. The apparatus for welding of fillet weld of thin walled small diameter pipe according to claim 1, characterized in that, The conveying mechanism comprises a first sliding base (3), a second screw rod (2) is rotatably installed on the base (1), the second screw rod (2) is connected with the first sliding base (3) through threads, a first guide rod is arranged on the base (1) and is slidably connected with the base (1), a plurality of mounting seats (4) are fixedly installed on the first sliding base (3), two groups of rollers (5) are rotatably installed on the mounting seats (4), the two groups of rollers (5) are arranged in the same plane, one group of the rollers (5) is driven by a first motor (6), and the two groups of rollers (5) are arranged in a V shape.

3. The thin-walled small-bore tube fillet welding apparatus according to claim 1, characterized by The lifting mechanism comprises a sliding block (13), a plurality of second guide rods (14) are fixedly arranged on the support (7), a plurality of sliding blocks (13) are arranged, the sliding blocks (13) are fixedly installed on the lifting seat (12), the sliding blocks (13) are slidably connected with the second guide rods (14), two groups of first screw rods (11) are rotatably arranged on the support (7), the first screw rods (11) are connected with the lifting seat (12) through threads, end portions of the first screw rods (11) are fixedly installed with pulleys (10), the two groups of pulleys (10) are connected through a transmission belt (9), one group of the first screw rods (11) is driven by a second motor (8), and the second motor (8) is fixedly installed on the support (7).

4. The thin-walled small-bore tube fillet welding apparatus according to claim 1, characterized by The clamping piece (16) is provided with an antiskid layer.

5. A method of welding a fillet weld of a thin-walled small-bore pipe, characterized by, The method is applied to the corner weld welding device of the thin-walled small-diameter pipe as claimed in any one of claims 1-4, and the method comprises: The base pipe is placed on the conveying mechanism, the distance sensor (35) is moved through the movement of the clamping mechanism, the size of the base pipe is determined according to the detection data of the distance sensor (35), and modeling is performed; The to-be-welded pipe is clamped by the clamping mechanism, the to-be-welded pipe is pre-cut according to the size of the base pipe, and the pretreated to-be-welded pipe is obtained; The to-be-welded pipe is welded by the first welding mechanism and the second welding mechanism simultaneously, and the welding work is completed.

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