Arc magnetic control welding device for stainless steel pipe fittings

Abstract

The invention discloses an arc magnetron welding device for stainless steel pipe fittings, comprising a workbench and a protective preheating mechanism, wherein a stainless steel pipe body is placed above the workbench, a mechanical arm welding gun is slidably arranged on the upper surface of the workbench and is located in front of the left end of the stainless steel pipe body, and the protective preheating mechanism comprises an annular protective shell sleeved on the end of the stainless steel pipe body, a notch is opened on the surface of the annular protective shell, a preheating component is arranged at the notch, and a plurality of cleaning strips are arranged on the inner surface of the annular protective shell; the invention can shield and protect the pipe body outside the welding annular seam during the magnetron welding of the stainless steel pipe body, so as to avoid damage to the pipe body surface caused by splashing of debris, and at the same time, external gas can be sucked into the preheating chamber for heating and discharged to act on the annular seam of the pipe body, so as to preheat the pipe body in advance and reduce the generation of cooling stress, and at the same time, during the welding process, the protective gas can be further cooled to improve the welding effect of the protective gas on the annular seam.

Description

Technical Field

[0001] The invention belongs to the technical field of stainless steel pipe welding, and in particular relates to an arc magnetron welding device for stainless steel pipes. Background Art

[0002] Magnetron arc welding is a method that uses an external magnetic field to control or improve the stability of the arc welding process. It can be applied to the field of stainless steel pipe welding.

[0003] For example, a magnetron welding device for titanium welded pipe production with announcement number CN216858547U includes a welding chamber, two welding rollers are symmetrically arranged on the bottom inner wall of the welding chamber, and a pipe is placed on the bottom inner wall of the welding chamber between the two welding rollers...

[0004] When the welding gun in the magnetron arc welding device in the above patent welds the annular seam of the stainless steel pipe, the debris generated by the welding may splash onto the unwelded surface of the stainless steel pipe, and the high-temperature debris may damage the surface of the stainless steel pipe fittings. At the same time, the direct welding of the stainless steel pipe fittings with the high-temperature welding gun may increase the cooling stress. For this reason, we propose an arc magnetron welding device for stainless steel pipe fittings. Summary of the invention

[0005] The object of the present invention is to provide an arc magnetron welding device for stainless steel pipe fittings to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: an arc magnetron welding device for stainless steel pipe fittings, comprising a workbench and a protective preheating mechanism, a stainless steel pipe body is placed above the workbench, a mechanical arm welding gun located in front of the left end of the stainless steel pipe body is slidably arranged on the upper surface of the workbench, the protective preheating mechanism comprises an annular protective shell sleeved on the end of the stainless steel pipe body, a notch is opened on the surface of the annular protective shell, a preheating component is arranged at the notch, and a plurality of cleaning strips are arranged on the inner surface of the annular protective shell;

[0007] The preheating component includes a processing box embedded in the notch, and the front and rear surfaces of the processing box are provided with air inlets and exhaust holes for the robot arm welding gun head to pass through. An insulation board is vertically arranged inside the processing box, and the insulation board divides the internal space of the processing box into a cooling chamber in the middle and two preheating chambers on both sides. A gas pipe is arranged inside the cooling chamber and is sleeved on the outside of the exhaust hole. A spiral refrigeration pipe is sleeved on the gas pipe, and a plurality of heating pipes are arranged inside the preheating chamber.

[0008] Preferably, the preheating component further comprises an air pump installed on the side of the processing box, an air supply pipe is arranged between the air pump and the front surface of the processing box, and an exhaust pipe is arranged on the rear surface of the processing box.

[0009] Preferably, a plurality of lifting cylinders are provided on the front and rear surfaces of the annular protective shell along its circumferential direction, and universal wheels are provided at the inner ends of the lifting cylinders.

[0010] Preferably, an inner cavity is provided inside the annular protective shell, a suction pipe is provided on the outer surface of the right end of the annular protective shell, two air suction ports are provided on the inner surface of the left end of the annular protective shell, and a filter plate is embedded inside the annular protective shell.

[0011] Preferably, the front surface of the processing box is provided with a clamping member located outside the air inlet, and the clamping member includes an arc-shaped clamping plate located relatively outside the air inlet, and a clamping cylinder is provided on the outer surface of the arc-shaped clamping plate, and a support plate is provided between the clamping cylinder and the processing box.

[0012] Preferably, the rear surface of the arc-shaped clamping plate is provided with an arc-shaped protective ring located outside the air inlet.

[0013] Preferably, a movable component for driving the annular protective shell to move is provided on the upper surface of the workbench, and the movable component includes a stand fixed on the upper surface of the workbench, a fixed plate fixed to the upper surface of the annular protective shell is provided inside the upper end of the stand, a fixed rack is provided on the outer surface of the fixed plate along its length direction, and a rotating wheel is meshed on the outer side of the fixed rack.

[0014] Preferably, a driving motor for driving the rotating wheel to rotate is provided on the upper surface of the stand, an inner rail is provided on the inner side of the fixed plate along its length direction, a supporting sleeve is sleeved on the inner rail, and a fixed stand is vertically provided between the inner surface of the supporting sleeve and the inner surface of the upper end of the stand.

[0015] Preferably, the upper surface of the workbench is provided with two supporting rotating mechanisms for supporting the stainless steel pipe body, and a base is slidably provided at the lower end of the robotic arm welding gun.

[0016] Preferably, the supporting rotation mechanism includes a gear ring sleeved on a stainless steel tube body, a support wheel is meshedly arranged on the lower side of the gear ring, a plurality of drive cylinders are vertically arranged on the surface of the gear ring along its circumferential direction, and a clamping ball is arranged at the inner end of the drive cylinder.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The present invention can shield and protect the tube body outside the welding annular seam during the magnetron welding process of the stainless steel tube body to prevent debris splashing and causing damage to the tube body surface. At the same time, the external gas can be sucked into the preheating chamber for heating and discharged to act on the annular seam of the tube body, thereby preheating the tube body in advance and reducing the generation of cooling stress. At the same time, during the welding process, the shielding gas can be further cooled to improve the welding effect of the shielding gas on the annular seam.

[0019] (2) The clamping member designed in the present invention can further clamp and fix the gun head and the processing box when the gun head of the robot arm welding gun passes through the processing box to weld the stainless steel pipe body, thereby keeping the gun head and the processing box body in close contact, facilitating the shielding gas to enter the gas pipe, and increasing the stability of the robot arm welding gun in welding the stainless steel pipe body.

[0020] (3) The present invention adopts a movable component designed to adjust the position of the annular protective shell according to the position of the stainless steel tube body to be welded, so as to always provide shielding and protection for the surface of the stainless steel tube body that is not welded, thereby expanding the adaptability and convenience of the stainless steel tube body. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a stainless steel pipe magnetron arc welding device of the present invention;

[0022] Figure 2 It is a left-side structural schematic diagram of the stainless steel pipe magnetron arc welding device of the present invention;

[0023] Figure 3 For the present invention Figure 1 Structural diagram of the middle protection preheating mechanism;

[0024] Figure 4 For the present invention Figure 3 A cross-sectional view of the preheating component;

[0025] Figure 5 For the present invention Figure 4 A schematic diagram of the rear view structure of the preheating component;

[0026] Figure 6 For the present invention Figure 3 Schematic diagram of the structure of the middle annular protective shell;

[0027] Figure 7 For the present invention Figure 3 A cross-sectional view of the middle annular protective shell;

[0028] Figure 8 For the present invention Figure 3 A schematic diagram of the structure of the clamping member;

[0029] Fig. 9 For the present invention Figure 3 A schematic diagram of the structure of the movable member viewed from above;

[0030] Fig.10 For the present invention Fig. 9 A magnified image of area A;

[0031] In the figure: 100, workbench; 101, stainless steel pipe body; 102, base; 103, mechanical arm welding gun; 104, support rotation mechanism; 200, protective preheating mechanism; 201, annular protective shell; 2011, inner cavity; 2012, suction pipe; 2013, filter plate; 2014, air extraction port; 202, cleaning strip; 203, preheating component; 2031, treatment box; 2032, insulation board; 2033, gas pipe; 2034, spiral refrigeration pipe; 2035, heating pipe; 2036, air pump; 2037 , air supply pipe; 2038, exhaust pipe; 2039, exhaust hole; 2040, stabilizing frame; 204, moving member; 2041, vertical frame; 2042, fixed plate; 2043, driving motor; 2044, fixed rack; 2045, rotating wheel; 2046, inner rail; 2047, supporting sleeve; 2048, fixed vertical plate; 205, clamping member; 2051, arc-shaped clamping plate; 2052, clamping cylinder; 2053, arc-shaped protective ring; 2054, support plate; 206, lifting cylinder; 207, universal wheel. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example 1

[0034] See also Figure 1 - Figure 6The present invention provides a technical solution: an arc magnetron welding device for stainless steel pipe fittings, comprising a workbench 100 and a protective preheating mechanism 200. By providing the protective preheating mechanism 200, during the magnetron welding process of the stainless steel pipe body 101, the pipe body outside the welding annular seam can be shielded and protected to prevent debris splashing and damage to the pipe body surface. At the same time, the external gas can be sucked into the preheating chamber for heating and discharged to act on the pipe body annular seam, so as to preheat the pipe body in advance and reduce the generation of cooling stress. At the same time, during the welding process, the protective gas can be further cooled to improve the welding effect of the protective gas on the annular seam. A stainless steel pipe body 101 is placed above the workbench 100, and a A robotic arm welding gun 103 is located in front of the left end of the stainless steel pipe body 101. The protective preheating mechanism 200 includes an annular protective shell 201 sleeved on the end of the stainless steel pipe body 101. The annular protective shell 201 does not affect the rotation of the stainless steel pipe body 101 for welding, and can shield and protect the surface of the stainless steel pipe body 101 around the annular weld to prevent debris from splashing and causing damage to the pipe body surface. A notch is provided on the surface of the annular protective shell 201 to facilitate the installation of the preheating component 203. The preheating component 203 is provided at the notch. A plurality of cleaning strips 202 are provided on the inner surface of the annular protective shell 201. The cleaning strips 202 can clean the welding position in advance when the stainless steel pipe body 101 rotates to keep the welding position clean.

[0035] The preheating component 203 includes a processing box 2031 embedded in the notch, and the front and rear surfaces of the processing box 2031 are provided with an air inlet and an exhaust hole 2039 for the tip of the robot arm welding gun 103 to pass through, and the tip of the robot arm welding gun 103 can pass through the air inlet and the exhaust hole 2039 to extend to the surface of the stainless steel pipe body 101, without affecting the welding of the surface of the stainless steel pipe body 101. The interior of the processing box 2031 is vertically provided with a heat insulation board 2032, which is a heat-insulating and high-temperature resistant board, so that the cooling chamber and the preheating chamber will not affect each other, and the heat insulation board 2032 divides the internal space of the processing box 2031 into a cooling chamber in the middle and a cooling chamber in the middle. The cooling chamber has two preheating chambers on both sides, and a gas pipe 2033 is arranged inside the cooling chamber and is sleeved on the outside of the exhaust hole 2039. The gun head of the robot arm welding gun 103 can pass through the gas pipe 2033, and the end of the gun head is in contact with the surface of the processing box 2031. The shielding gas can be discharged through the gas channel opened on the surface of the gun head, and the exhausted gas enters the gas pipe 2033 and can be cooled to further reduce the temperature. The cooling effect does not affect the performance and function of the shielding gas itself. A spiral refrigeration pipe 2034 is sleeved on the gas pipe 2033, and a plurality of heating pipes 2035 are arranged inside the preheating chamber, and the gas sucked from the outside can be sent into the preheating chamber.

[0036] In this embodiment, preferably, the preheating component 203 also includes an air pump 2036 installed on the side of the processing box 2031, and a stabilizing frame 2040 is arranged between the two to provide stable support for the air pump 2036. An air supply pipe 2037 is arranged between the air pump 2036 and the front surface of the processing box 2031. The air supply pipe 2037 is connected to the preheating chamber and can deliver external gas into the preheating chamber. An exhaust pipe 2038 is arranged on the rear surface of the processing box 2031. The two exhaust pipes 2038 are L-shaped and relatively distributed, so that the ends of the two exhaust pipes 2038 can concentrate on preheating the annular seam of the stainless steel pipe body 101.

[0037] In this embodiment, preferably, a plurality of lifting cylinders 206 are provided on the front and rear surfaces of the annular protective shell 201 along its circumferential direction. The lifting cylinders 206 can change the distance between the universal wheel 207 and the stainless steel tube body 101. The inner end of the lifting cylinder 206 is provided with a universal wheel 207. The universal wheel 207 is used to contact the stainless steel tube body 101, so that the annular protective shell 201 can be moved and changed in position on the stainless steel tube body 101, so as to shield and protect the annular seams at different positions.

[0038] In the present embodiment, preferably, an inner cavity 2011 is opened inside the annular protective shell 201, a suction pipe 2012 is provided on the outer surface of the right end of the annular protective shell 201, and two exhaust ports 2014 are provided on the inner surface of the left end of the annular protective shell 201. The exhaust port 2014 is located outside the gun head of the robot arm welding gun 103, so that the discharged protective gas can be conveniently sucked into the inner cavity 2011 for easy recovery. A filter plate 2013 is embedded in the annular protective shell 201, and a handle is provided on the upper surface of the filter plate 2013 to facilitate the removal of the filter plate 2013, so as to filter the impurities mixed in the recovered protective gas.

[0039] In summary, when in use, the stainless steel tube body 101 is placed at a suitable position on the workbench 100, the annular protective shell 201 is sleeved on the stainless steel tube body 101, the robot arm welding gun 103 is moved to the outside of the annular protective shell 201, and the position of the welding gun head is adjusted, and the welding gun head is extended to the surface of the stainless steel tube body 101 through the exhaust hole 2039 and the air inlet on the surface of the processing box 2031, and the welding gun head passes through the gas pipe 2033, and the welding gun head is attached to the surface of the processing box 2031. Before the circumferential seam welding on the surface of the stainless steel tube body 101, the air pump 2036 works to draw the external gas into the air inlet hole. The air inlet hole is provided with a filter screen to play a safe filtering role. The gas is sent into the preheating chamber through the air supply pipe 2037, and is heated by the heating pipe 2035 in the preheating chamber. The heated gas is discharged through the exhaust pipe 2038. The heated gas discharged from the relatively distributed exhaust pipe 2038 acts on the stainless steel tube body 101 to be welded, and the stainless steel tube body 101 is heated. 1 The welding place is preheated to reduce cooling stress and improve the plasticity of the stainless steel pipe body 101. After the preheating is completed, the air pump 2036 stops working to reduce the discharge of hot gas. When the robot arm welding gun 103 performs magnetron welding on the stainless steel pipe body 101, the stainless steel pipe body 101 rotates under the drive of the supporting rotating mechanism 104, which is convenient for the arc welding processing of the robot arm welding gun 103. While the stainless steel pipe body 101 is rotating and welding, the cleaning strip 202 is used to clean the pipe body surface at the welding place in advance to keep the cleanliness of the pipe body at the welding place and reduce the influence of impurities on the welding quality. The outside world introduces shielding gas into the gun head of the robot arm welding gun 103, and the introduced shielding gas first enters the gas pipe 2033. At this time, the gas pipe 2033 is cooled by the spiral refrigeration pipe 2034, so the shielding gas passing through is further cooled by the spiral refrigeration pipe 2034. The cooled shielding gas acts on the welding place, which has the effect of rapid cooling and improves the cooling effect on the welding place.

[0040] Example 2

[0041] Reference Figure 7 and Figure 8 , which is the second embodiment of the present invention, and this embodiment is different from the previous embodiment.

[0042] In this embodiment, preferably, a clamping member 205 located outside the air inlet is provided on the front surface of the processing box 2031. The clamping member 205 can be used to further clamp and fix the gun head and the processing box 2031 when the gun head of the robot arm welding gun 103 passes through the processing box 2031 to weld the stainless steel pipe body 101, so as to keep the gun head and the processing box 2031 in close contact, facilitate the entry of the protective gas into the gas pipe 2033, and increase the stability of the robot arm welding gun 103 in welding the stainless steel pipe body 101. The clamping member 205 includes an arc-shaped clamping plate 2051 relatively located outside the air inlet, and the arc-shaped clamping plate 205 1 can be stuck at the gun head and gun neck, so that the gun head of the robot arm welding gun 103 will not be separated from the processing box 2031 outwards, the outer surface of the arc-shaped clamping plate 2051 is provided with a clamping cylinder 2052, and a support plate 2054 is provided between the clamping cylinder 2052 and the processing box 2031 to increase the installation strength of the clamping cylinder 2052. The rear surface of the arc-shaped clamping plate 2051 is provided with an arc-shaped protective ring 2053 located on the outside of the air inlet. The arc-shaped protective rings 2053 are all semicircular, and the relatively distributed arc-shaped protective rings 2053 can be spliced ​​to form a circle sleeved on the outside of the air inlet. The arc-shaped protective ring 2053 plays a role in reducing the overflow of the protective gas.

[0043] In summary, when the gun head of the robotic arm welding gun 103 passes through the processing box 2031, the gun head fits against the front surface of the processing box 2031, and the two clamping cylinders 2052 pass through at the same time. The internal piston rod extends, driving the two arc-shaped clamping plates 2051 to move relative to each other and get stuck at the neck of the robotic arm welding gun 103, and the arc-shaped protective ring 2053 surrounds the gun head and the processing box 2031, further surrounding the two, reducing the overflow of the protective gas, and increasing the installation tightness of the robotic arm welding gun 103 and the processing box 2031, so that it will not detach outward, which is convenient for the robotic arm welding gun 103 to stably weld the stainless steel pipe body 101, and convenient for the protective gas to continuously and stably enter the gas pipe 2033.

[0044] Example 3

[0045] Reference Fig. 9 and Fig.10 , which is the third embodiment of the present invention, and this embodiment is different from the above two embodiments.

[0046] In this embodiment, preferably, a moving member 204 for driving the annular protective shell 201 to move is provided on the upper surface of the workbench 100. By providing the moving member 204, the position of the annular protective shell 201 can be adjusted according to the position of the surface of the stainless steel pipe body 101 to be welded, so as to facilitate the shielding and protection of the surface of the stainless steel pipe body 101 that is not welded, and expand the adaptive protection range and convenience of the stainless steel pipe body 101. The moving member 204 includes a stand 2041 fixed on the upper surface of the workbench 100, and a fixed plate 2042 fixed to the upper surface of the annular protective shell 201 is provided inside the upper end of the stand 2041, which can play a suspending support role for the annular protective shell 201, and a fixed rack 2044 is provided on the outer surface of the fixed plate 2042 along its length direction, and a rotating wheel 2045 is meshed on the outer side of the fixed rack 2044, and the two are meshed to facilitate the movement of the fixed plate 2042.

[0047] In this embodiment, preferably, a driving motor 2043 for driving the rotating wheel 2045 to rotate is provided on the upper surface of the vertical frame 2041, an inner rail 2046 is provided on the inner side of the fixed plate 2042 along its length direction, and a supporting sleeve 2047 is sleeved on the inner rail 2046. The supporting sleeve 2047 supports the fixed plate 2042 without affecting the movement of the fixed plate 2042. A fixed vertical plate 2048 is vertically provided between the inner surface of the supporting sleeve 2047 and the inner surface of the upper end of the vertical frame 2041, and the fixed vertical plate 2048 supports the supporting sleeve 2047.

[0048] In this embodiment, preferably, two supporting rotating mechanisms 104 for supporting the stainless steel pipe body 101 are provided on the upper surface of the workbench 100 , and a base 102 is slidably provided at the lower end of the robot arm welding gun 103 to change the welding position of the robot arm welding gun 103 .

[0049] In this embodiment, preferably, the supporting rotating mechanism 104 includes a gear ring mounted on the stainless steel tube body 101, a support wheel is meshedly arranged on the lower side of the gear ring, the support wheel is connected to the motor, the motor is used to drive the support wheel to rotate, and the meshing of the support wheel drives the gear ring to rotate, and a plurality of clamping balls clamp and fix the stainless steel tube body 101 at the same time, which can drive the stainless steel tube body 101 to rotate synchronously, a plurality of driving cylinders are vertically arranged on the surface of the gear ring along its circumferential direction, and a clamping ball is arranged at the inner end of the driving cylinder.

[0050] In summary, according to the position of the surface of the stainless steel tube body 101 to be welded, the driving motor 2043 is operated to drive the rotating wheel 2045 to rotate, and the fixed rack 2044 and the fixed plate 2042 engaged therewith move, driving the inner rail 2046 to slide in the supporting sleeve 2047, and the movement of the fixed plate 2042 drives the annular protective shell 201 to move along the stainless steel tube body 101 until the annular protective shell 201 is located at a suitable position on the stainless steel tube body 101, and the driving motor 2043 stops working. During the welding process of the stainless steel tube body 101, the annular protective shell 201 shields and protects the tube body outside the welding to reduce the damage of debris to the surface of the tube body.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An arc magnetron welding device for stainless steel pipe fittings, comprising a workbench (100) and a protective preheating mechanism (200), characterized in that: A stainless steel tube body (101) is placed above the workbench (100); a mechanical arm welding gun (103) is slidably arranged on the upper surface of the workbench (100) and is located in front of the left end of the stainless steel tube body (101); the protective preheating mechanism (200) comprises an annular protective shell (201) sleeved on the end of the stainless steel tube body (101); a notch is provided on the surface of the annular protective shell (201); a preheating component (203) is arranged at the notch; and a plurality of cleaning strips (202) are arranged on the inner surface of the annular protective shell (201); The preheating component (203) comprises a processing box (2031) embedded in the notch, the front and rear surfaces of the processing box (2031) are provided with an air inlet and an exhaust hole (2039) for the tip of the robot arm welding gun (103) to pass through, a heat insulation board (2032) is vertically arranged inside the processing box (2031), the heat insulation board (2032) divides the internal space of the processing box (2031) into a cooling chamber in the middle and two preheating chambers on both sides, a gas pipe (2033) is arranged inside the cooling chamber and sleeved on the outside of the exhaust hole (2039), a spiral refrigeration pipe (2034) is sleeved on the gas pipe (2033), and a plurality of heating pipes (2035) are arranged inside the preheating chamber; The preheating component (203) further comprises an air pump (2036) installed on the side of the processing box (2031); an air supply pipe (2037) is provided between the air pump (2036) and the front surface of the processing box (2031); and an exhaust pipe (2038) is provided on the rear surface of the processing box (2031); A plurality of lifting cylinders (206) are provided on the front and rear surfaces of the annular protective shell (201) along its circumferential direction, and a universal wheel (207) is provided at the inner end of each lifting cylinder (206); An inner cavity (2011) is provided inside the annular protective shell (201), a suction pipe (212) is provided on the outer surface of the right end of the annular protective shell (201), two air suction ports (214) are provided on the inner surface of the left end of the annular protective shell (201), and a filter plate (2013) is embedded inside the annular protective shell (201).

2. The arc magnetron welding device for stainless steel pipe fittings according to claim 1, characterized in that: The front surface of the processing box (2031) is provided with a clamping member (205) located outside the air inlet, and the clamping member (205) includes an arc-shaped clamping plate (2051) located relatively outside the air inlet, and the outer surface of the arc-shaped clamping plate (2051) is provided with a clamping cylinder (2052), and a support plate (2054) is provided between the clamping cylinder (2052) and the processing box (2031).

3. The arc magnetron welding device for stainless steel pipe fittings according to claim 2, characterized in that: The rear surface of the arc-shaped clamping plate (2051) is provided with an arc-shaped protective ring (2053) located outside the air inlet.

4. The arc magnetron welding device for stainless steel pipes according to claim 1, characterized in that: The upper surface of the workbench (100) is provided with a moving component (204) for driving the annular protective shell (201) to move, the moving component (204) comprising a stand (2041) fixed to the upper surface of the workbench (100), a fixing plate (2042) fixed to the upper surface of the annular protective shell (201) being provided inside the upper end of the stand (2041), a fixing rack (2044) being provided on the outer surface of the fixing plate (2042) along its length direction, and a rotating wheel (2045) being meshedly provided on the outer side of the fixing rack (2044).

5. The arc magnetron welding device for stainless steel pipes according to claim 4, characterized in that: A driving motor (2043) for driving the rotating wheel (2045) to rotate is arranged on the upper surface of the stand (2041); an inner rail (2046) is arranged on the inner side of the fixed plate (2042) along its length direction; a supporting sleeve (2047) is sleeved on the inner rail (2046); and a fixed stand (2048) is vertically arranged between the inner surface of the supporting sleeve (2047) and the inner surface of the upper end of the stand (2041).

6. The arc magnetron welding device for stainless steel pipes according to claim 1, characterized in that: The upper surface of the workbench (100) is provided with two supporting rotating mechanisms (104) for supporting the stainless steel tube body (101), and the lower end of the robot arm welding gun (103) is slidably provided with a base (102).

7. The arc magnetron welding device for stainless steel pipes according to claim 6, characterized in that: The supporting rotation mechanism (104) comprises a gear ring sleeved on a stainless steel tube body (101), a supporting wheel being meshedly arranged on the lower side of the gear ring, a plurality of driving cylinders being vertically arranged on the surface of the gear ring along its circumferential direction, and a clamping ball being arranged at the inner end of the driving cylinder.

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