Pipe flange welding device

Abstract

The utility model relates to the technical field of pipe flange welding, in particular to a pipe flange welding device which comprises a base, and a rotary overturning locking mechanism and a bracket adjusting mechanism which are used for supporting the two ends of a welded pipe are arranged on the base. The rotary turnover locking mechanism is provided with a support, a turnover table is arranged on the support, a disc seat is rotatably connected to the end face of the turnover table, a rotary disc is fixedly connected to the disc seat, a disc wire is rotatably connected to the disc seat, clamping jaws are slidably connected to the end face of the rotary disc, and the clamping jaws are distributed on the rotary disc in a central symmetry mode. The clamping jaw is meshed with the coiled wire, and the clamping jaw slides synchronously when the coiled wire rotates; the bracket adjusting mechanism is provided with a sliding seat, a lifting assembly is installed on the sliding seat, and the top end of the lifting assembly is connected with a roller seat. The rotating and overturning locking mechanism can achieve the rotating and overturning functions of the welded pipe, clamping jaws which are distributed in a central symmetry mode are arranged on a rotating disc of the rotating and overturning locking mechanism so that the welded pipe, a polygonal pipe, a conical pipe and the like can be welded to a flange, and the applicability of the device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe flange welding, in particular to a pipe flange welding device. Background Art

[0002] At present, the welding between the welded pipe and the flange is generally carried out by argon arc welding or arc welding. The general steps of welding the welded pipe and the flange are: first, the flange and the welded pipe are fixed by spot welding, and then the interface of the flange and the welded pipe is circumferentially welded. In the process of circumferentially welding the interface of the flange and the welded pipe, the workers usually do the operation manually, which is not only labor-intensive but also inefficient. In addition, manual rotation of the flange or the welded pipe is prone to deviation, which makes the welding surface uneven and the weldment poorly formed, and it is difficult to meet the actual needs.

[0003] Some welding devices in the prior art achieve the purpose of welding flanges by positioning and rotating the welded pipe, but this method is only suitable for welding flanges at both ends of seamless round pipes. When used to weld seam welded pipes, polygonal pipes and tapered pipes to flanges, the welded pipe rotates unevenly and cannot be used, so the above-mentioned flange welding device has a small scope of application; and the existing welding device only limits the position where the welded pipe needs to be welded, but there is no support point at the other end of the welded pipe. Some welded pipes are too long and are placed on the ground or placed randomly, so that they are not welded to the correct position due to the angle during welding, which ultimately makes the welded pipe unusable and causes a waste of resources. Utility Model Content

[0004] The utility model aims to provide a pipe flange welding device, which solves the problems of small application range and lack of support.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pipe flange welding device comprises a base, the base is provided with a rotary flip locking mechanism and a bracket adjustment mechanism for supporting both ends of the welding pipe; the rotary flip locking mechanism has a bracket, the bracket is provided with a flip table, the end surface of the flip table is rotatably connected with a disc seat, the disc seat is fixedly connected with a rotating disc, the disc seat is rotatably connected with a coil wire, the end surface of the rotating disc is slidably connected with a clamping claw and the clamping claw is symmetrically distributed on the rotating disc, the clamping claw bites with the coil wire and slides synchronously when the coil wire rotates, and the central opening of the flip table, the disc seat and the rotating disc is used for inserting the welding pipe; the bracket adjustment mechanism has a sliding seat, a lifting assembly is installed on the sliding seat, the top of the lifting assembly is connected with a roller seat, and rollers are symmetrically placed on the roller seat according to the diameter of the welding pipe.

[0006] The above technical scheme sets a rotary flip locking mechanism and a bracket adjustment mechanism. The rotary flip locking mechanism can realize the rotation and flipping functions of the welded pipe. Secondly, the rotary disk of the rotary flip locking mechanism is provided with claws that are symmetrically distributed on the center so that the welded pipe, polygonal pipe and conical pipe can be welded with the flange, thereby improving the applicability of the device; in addition, the rotary flip locking mechanism provides support for one end of the welded pipe, and provides support for the other end of the welded pipe through the bracket adjustment mechanism. The bracket adjustment mechanism can adjust the height and roller position according to the size of the welded pipe, thereby further improving the applicability of the device.

[0007] The base is provided with an installation groove corresponding to the slide seat, and guide rails are provided on both sides of the installation groove. Slide blocks connected to the guide rails are connected on both sides of the lower end surface of the slide seat. A guide rod is vertically slidably connected to the slide seat, and the top of the guide rod is connected to the roller seat. The lifting assembly adopts a worm gear screw lift, and the telescopic end of the screw of the worm gear screw lift is rotatably connected to the bottom of the roller seat, and the transmission end of the worm gear screw lift is connected to a handwheel.

[0008] The above technical solution sets a guide rail so that the slide seat of the bracket adjustment mechanism can be adjusted according to the length of the welding pipe, and adopts a worm screw lifter to realize the lifting and lowering of the roller seat by turning the hand wheel.

[0009] The roller seat is box-shaped with an opening facing upwards, and placement grooves corresponding to the rollers are symmetrically opened on the roller seat.

[0010] The roller seat of the above technical solution is box-shaped, and a placement groove is opened on the roller seat to place the roller. The roller is reasonably placed to match the welding pipe, and the welding pipe is supported by the roller. The device has a simple structure and good use effect.

[0011] It also includes a quick positioning component, which contains a mounting plate fixedly connected to the side of the sliding seat, a clamping seat connected to the mounting plate, the clamping seat having a guide section, a storage section and a hinge section, a push rod is slidably provided in the guide section, one end of the push rod is connected to a friction block that abuts against the guide rail, a handle is hinged on the hinge section, a connecting piece is provided between the end of the push rod away from the friction block and the handle, and the two ends of the connecting piece are respectively hinged to the push rod and the handle; a first hinge point is formed between the push rod and the connecting piece, a second hinge point is formed between the connecting piece and the handle, and a third hinge point is formed between the handle and the hinge section; when the push rod moves until the friction block abuts against the guide rail, the central axis of the push rod, the first hinge point, the second hinge point and the third hinge point are collinear.

[0012] The above technical solution sets up a quick positioning component to lock the slide in a suitable position. A clamping seat is set on the side of the slide, and a push rod, a handle and a connecting piece are provided on the clamping seat. One end of the push rod also has a friction block. By bending the handle, the friction block at one end of the push rod can be made to abut against the guide rail. Since the slide and the friction block are in a relatively fixed state, the static friction between the friction block and the guide rail can fix the slide in a specified position, thereby preventing the slide from sliding back and forth during welding and affecting the welding quality.

[0013] The bracket is composed of two columns, and connecting shafts are fixedly connected to the two sides of the turning table. Axial holes corresponding to the connecting shafts are opened on the inner walls of the top ends of the two columns, and bushings adapted to the connecting shafts are provided in the axle holes. A meshing worm wheel and worm are provided in one of the columns, and the worm wheel is fixedly connected to one end of the connecting shaft. The worm is rotatably installed on the inner walls on both sides of the column, and a reducer dynamically connected to one end of the worm is installed on the outer wall of the column.

[0014] The bracket of the above technical solution adopts two columns to support the turning table. A worm gear is installed on the connecting shaft on either side of the turning table. The worm engaged with the worm gear is driven by the reducer to rotate, so that the turning table can be turned over, which is convenient for loading the welding pipe and adjusting the horizontal state of the welding pipe, thereby improving the welding quality.

[0015] A slewing bearing is fixedly connected inside the flip table, a gear ring is rotatably connected to the slewing bearing, a front end face of the gear ring is fixedly connected to a rear end face of the disc seat, a servo motor is installed on the rear end face of the flip table, and a gear meshing with the gear ring is connected to the shaft extension end of the servo motor.

[0016] The turning table of the above technical solution is rotatably installed with a gear ring, and the gear ring is fixedly connected to a turntable. The servo motor can drive the gear ring to rotate through the gear, and then drive the turntable to rotate, so as to drive the welding pipe installed on the turntable to rotate, thereby improving the automation level of the device and thus improving work efficiency.

[0017] It also includes a three-axis moving mechanism, which is installed on one side of the base. The three-axis moving mechanism includes a vertical beam and a horizontal beam. The side of the vertical beam is vertically slidably connected to a slider plate, and the side of the slider plate is laterally slidably connected to the horizontal beam. The bottom end of the vertical beam is slidably installed on the base according to the axial direction of the welding pipe, and one end of the horizontal beam is connected to a welding head.

[0018] The above technical solution drives the welding head to move by setting up a three-axis moving mechanism. The vertical beam moves on the slide so that the welding head can move in the horizontal direction. The cross beam can move up and down and left and right along the vertical beam through the slider plate so that the welding head can move vertically and longitudinally, thereby ensuring that the welding head can reach any position above the welding pipe and improving the welding quality.

[0019] Technical effects and advantages of the utility model:

[0020] 1. In this scheme, by setting a rotary flip locking mechanism and a bracket adjustment mechanism, the rotary flip locking mechanism can realize the rotation and flipping functions of the welded pipe. Secondly, the rotary disk of the rotary flip locking mechanism is provided with claws distributed symmetrically in the center, so as to weld the seam-welded pipe, polygonal pipe and conical pipe with the flange, thereby improving the applicability of the device.

[0021] 2. In this solution, the rotary flip locking mechanism provides support for one end of the welding pipe, and the bracket adjustment mechanism provides support for the other end of the welding pipe. The bracket adjustment mechanism can adjust the height and roller position according to the size of the welding pipe, further improving the scope of application of the device.

[0022] 3. In this solution, a guide rail is provided so that the slide seat of the bracket adjustment mechanism can be adjusted according to the length of the welded pipe, and a worm gear screw lifter is used to realize the lifting and lowering of the roller seat by turning the hand wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A three-dimensional diagram of the pipe flange welding device provided by the utility model;

[0024] Figure 2 A three-dimensional diagram of the bracket adjustment mechanism provided by the utility model;

[0025] Figure 3 A schematic diagram of the structure of the turning table provided by the utility model;

[0026] Figure 4 A three-dimensional diagram of the rotary flip locking mechanism provided by the utility model;

[0027] Figure 5 for Figure 4 a cross-sectional view in the longitudinal plane;

[0028] Figure 6 This is a structural schematic diagram of the rapid positioning component provided by the utility model.

[0029] 1. Base; 2. Column; 3. Turntable; 4. Disc seat; 5. Turntable; 6. Clamp; 7. Wire; 8. Gear ring; 9. Rotary bearing; 10. Gear; 11. Servo motor; 12. Connecting shaft; 13. Worm gear; 14. Worm; 15. Reducer; 16. Extension arm; 17. Mounting slot; 18. Guide rail; 19. Slide seat; 20. Worm screw lifter; 21. Roller seat; 2101. Placement slot; 22. Roller; 23. Handwheel; 24. Slider; 25. Guide rod; 26. Mounting plate; 27. Clamp seat; 2701. Guide section; 2702. Storage section; 2703. Articulated section; 28. Push rod; 29. ​​Linkage; 30. Handle; 31. Friction block; 32. Vertical beam; 33. Horizontal beam; 34. Slider plate; 35. Welding head. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] Example 1

[0032] This embodiment provides Figure 1 The pipe flange welding device shown comprises a base 1, on which a rotary flip locking mechanism and a bracket adjustment mechanism for supporting both ends of the welding pipe are provided; the rotary flip locking mechanism comprises a bracket, on which a flip table 3 is provided, on the end surface of the flip table 3 a disc seat 4 is rotatably connected, on the disc seat 4 a rotary disc 5 is fixedly connected, on the disc seat 4 a coil wire 7 is rotatably connected, on the end surface of the rotary disc 5 a clamping claw is slidably connected and the clamping claw is centrally symmetrically distributed on the rotary disc 5, the clamping claw engages with the coil wire 7 and slides synchronously when the coil wire 7 rotates, and the central opening of the flip table 3, the disc seat 4 and the rotary disc 5 is used for inserting the welding pipe; in addition, an extension arm 16 is welded on the coil wire 7, and the extension arm 16 can drive the coil wire 7 to rotate, thereby improving the use effect.

[0033] The bracket adjustment mechanism of the present embodiment has a slide 19, on which a lifting assembly is installed, and a roller seat 21 is connected to the top of the lifting assembly, on which rollers 22 are symmetrically placed according to the diameter of the welding pipe. By arranging a rotary flip locking mechanism and a bracket adjustment mechanism, the rotary flip locking mechanism can realize the rotation and flipping functions of the welding pipe. Secondly, claws with symmetrical distribution of the center are arranged on the rotating disk 5 of the rotary flip locking mechanism, so that the welding pipe, polygonal pipe and conical pipe can be welded with the flange, thereby improving the applicability of the present device; in addition, the rotary flip locking mechanism provides support for one end of the welding pipe, and provides support for the other end of the welding pipe through the bracket adjustment mechanism. The bracket adjustment mechanism can adjust the height and the position of the roller 22 according to the size of the welding pipe, thereby further improving the scope of application of the present device.

[0034] Specifically, combined Figure 2 As shown, a mounting groove 17 corresponding to a slide seat 19 is provided on the base 1, guide rails 18 are provided on both sides of the mounting groove 17, and sliders 24 connected to the guide rails 18 are connected to both sides of the lower end surface of the slide seat 19, and a guide rod 25 is vertically slidably connected to the slide seat 19, and the top of the guide rod 25 is connected to a roller seat 21. The lifting component adopts a worm gear screw lift 20, and the telescopic end of the screw of the worm gear screw lift 20 is rotatably connected to the bottom of the roller seat 21, and the transmission end of the worm gear screw lift 20 is connected to a hand wheel 23. The guide rail 18 is provided so that the slide seat 19 of the bracket adjustment mechanism can be adjusted according to the length of the welding pipe. The worm gear screw lift 20 is adopted, and the lifting and lowering of the roller seat 21 is realized by rotating the hand wheel 23.

[0035] For example Figure 2 As shown, the roller seat 21 of this embodiment is box-shaped and has an opening facing upward. Three groups of placement grooves 2101 are opened on the roller seat 21 from the inside to the outside, and each group has two symmetrically arranged placement grooves 2101 corresponding to the roller 22. The roller 22 is reasonably placed to match the welding pipe, and the welding pipe is supported by the roller 22. In addition, the roller seat 21 is box-shaped so that the placement grooves 2101 are opened on the roller seat 21 to place the roller 22. The device has a simple structure and good use effect.

[0036] Example 2

[0037] The difference between this embodiment and embodiment 1 is that this embodiment has a rapid positioning component, such as Figure 2 and Figure 3As shown, the quick positioning assembly includes a mounting plate 26 fixedly connected to the side of the slide 19, a clamping seat 27 is connected to the mounting plate 26, and the clamping seat 27 has a guide section 2701, a storage section 2702 and a hinge section 2703. A push rod 28 is slidably arranged in the guide section 2701, one end of the push rod 28 is connected to a friction block 31 that abuts against the guide rail 18, and a handle 30 is hinged on the hinge section 2703. The end of the push rod 28 away from the friction block 31 is hinged to the handle 30 A connecting piece 29 is provided in between, and the two ends of the connecting piece 29 are hinged to the push rod 28 and the handle 30 respectively; a first hinge point is formed between the push rod 28 and the connecting piece 29, a second hinge point is formed between the connecting piece 29 and the handle 30, and a third hinge point is formed between the handle 30 and the hinge section 2703. When the push rod 28 moves to the point where the friction block 31 abuts against the guide rail 18, the center axis of the push rod 28, the first hinge point, the second hinge point and the third hinge point are collinear.

[0038] The solution of this embodiment is to set up a quick positioning component to lock the slide 19 in a suitable position. A clamp seat 27 is set on the side of the slide 19. The clamp seat 27 is provided with a push rod 28, a handle 30 and a connecting piece 29. One end of the push rod 28 also has a friction block 31. By bending the handle 30, the friction block 31 at one end of the push rod 28 can be made to abut against the guide rail 18. Since the slide 19 and the friction block 31 are in a relatively fixed state, the static friction between the friction block 31 and the guide rail 18 can fix the slide 19 at a specified position, thereby preventing the slide 19 from sliding back and forth during welding and affecting the welding quality.

[0039] Furthermore, if Figure 4 and Figure 6 As shown, the support of this embodiment is two columns 2, and the two sides of the turning platform 3 are fixedly connected with a connecting shaft 12. The top inner walls of the two columns 2 are provided with shaft holes corresponding to the connecting shaft 12, and the shaft holes are provided with bushings adapted to the connecting shaft 12. One of the columns 2 is provided with a meshing worm wheel 13 and a worm 14, and the worm wheel 13 is fixedly connected to one end of the connecting shaft 12. The worm 14 is rotatably mounted on the inner walls of both sides of the column 2, and a reducer 15 connected to one end of the worm 14 is installed on the outer wall of the column 2. In this embodiment, the turning platform 3 is supported by two columns 2, and the worm wheel 13 is installed on the connecting shaft 12 on either side of the turning platform 3. The worm 14 meshing with the worm wheel 13 is driven to rotate by the reducer 15, so that the turning platform 3 can be turned over, which is convenient for feeding the welding pipe and adjusting the horizontal state of the welding pipe, thereby improving the welding quality.

[0040] like Figure 4 and Figure 5As shown, a slewing bearing 9 is fixedly connected inside the turning table 3, a gear ring 8 is rotatably connected to the slewing bearing 9, the front end face of the gear ring 8 is fixedly connected to the rear end face of the disc seat 4, a servo motor 11 is installed on the rear end face of the turning table 3, and the shaft extension end of the servo motor 11 is connected to a gear 10 meshing with the gear ring 8. Since the turning table 3 is rotatably installed with the gear ring 8, and the gear ring 8 is fixedly connected to the turntable 5, the servo motor 11 can drive the gear ring 8 to rotate through the gear 10, and then drive the turntable 5 to rotate, so as to drive the welding pipe installed on the turntable 5 to rotate, thereby improving the automation level of the device and thus improving the work efficiency.

[0041] The above-mentioned embodiments 1 and 2 also include a three-axis moving mechanism for driving the welding head 35 to move, such as Figure 1 As shown in the figure, the base 1 is arranged along the X-axis direction, the rotation and flip locking mechanism and the bracket adjustment mechanism are used to install the welding pipe, the three-axis moving mechanism is installed on one side of the base 1, and the three-axis moving mechanism includes a vertical beam 32 and a horizontal beam 33. The side of the vertical beam 32 is slidably connected to the slider 24 along the Z axis, and the side of the slider 24 is slidably connected to the horizontal beam 33 along the Y axis. The bottom end of the vertical beam 32 is slidably installed on the base 1 along the X-axis direction, and the end of the horizontal beam 33 close to the welding pipe is connected to the welding head 35.

[0042] Furthermore, the above technical solution drives the welding head 35 to move by setting up a three-axis moving mechanism. The vertical beam 32 and the base 1, the vertical beam 32 and the slider 24, and the slider 24 and the cross beam 33 can be connected by a fully automatic electric slide rail disclosed in patent number CN209687032U. The vertical beam 32 moves on the slide 19 so that the welding head 35 can move in the horizontal direction. The cross beam 33 can move up and down and left and right along the vertical beam 32 through the slider 24, so that the welding head 35 can automatically adjust its position through the three-axis moving mechanism, thereby ensuring that the welding head 35 can reach any position above the welding pipe, thereby improving the welding quality.

[0043] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pipe flange welding device, comprising a base (1), characterized in that: The base (1) is provided with a rotary flip locking mechanism and a bracket adjustment mechanism for supporting both ends of the welding pipe; the rotary flip locking mechanism comprises a bracket, the bracket is provided with a flip table (3), the end surface of the flip table (3) is rotatably connected with a disc seat (4), the disc seat (4) is fixedly connected with a rotating disc (5), the disc seat (4) is rotatably connected with a coil wire (7), the end surface of the rotating disc (5) is slidably connected with a clamping claw, and the clamping claw is centrally symmetrically distributed on the rotating disc (5), the clamping claw is engaged with the coil wire (7), and when the coil wire (7) rotates, the clamping claw slides synchronously, and the central opening of the flip table (3), the disc seat (4) and the rotating disc (5) is used for inserting the welding pipe; the bracket adjustment mechanism comprises a sliding seat (19), a lifting assembly is installed on the sliding seat (19), the top end of the lifting assembly is connected with a roller seat (21), and rollers (22) are symmetrically placed on the roller seat (21) according to the diameter of the welding pipe.

2. The pipe flange welding device according to claim 1, characterized in that: The base (1) is provided with a mounting groove (17) corresponding to the slide seat (19), guide rails (18) are provided on both sides of the mounting groove (17), and sliders (24) connected to the guide rails (18) are connected to both sides of the lower end surface of the slide seat (19), and a guide rod (25) is vertically slidably connected to the slide seat (19), and the top end of the guide rod (25) is connected to the roller seat (21), and the lifting component adopts a worm gear screw lift (20), and the telescopic end of the screw of the worm gear screw lift (20) is rotatably connected to the bottom of the roller seat (21), and the transmission end of the worm gear screw lift (20) is connected to a hand wheel (23).

3. The pipe flange welding device according to claim 1 or 2, characterized in that: The roller seat (21) is box-shaped with an opening facing upwards, and a placement groove (2101) corresponding to the roller (22) is symmetrically provided on the roller seat (21).

4. The pipe flange welding device according to claim 1 or 2, characterized in that: The quick positioning assembly also includes a mounting plate (26) fixedly connected to the side of the slide seat (19), a clamp seat (27) connected to the mounting plate (26), the clamp seat (27) having a guide section (2701), a storage section (2702) and a hinge section (2703), a push rod (28) slidingly provided in the guide section (2701), one end of the push rod (28) being connected to a friction block (31) abutting against the guide rail (18), a handle (30) being hingedly connected to the hinge section (2703), and one end of the push rod (28) being away from the friction block (31) A connecting piece (29) is provided between the end and the handle (30), and the two ends of the connecting piece (29) are respectively hinged to the push rod (28) and the handle (30); a first hinge point is formed between the push rod (28) and the connecting piece (29), a second hinge point is formed between the connecting piece (29) and the handle (30), and a third hinge point is formed between the handle (30) and the hinge section (2703); when the push rod (28) moves until the friction block (31) abuts against the guide rail (18), the central axis of the push rod (28), the first hinge point, the second hinge point and the third hinge point are collinear.

5. The pipe flange welding device according to claim 1, characterized in that: The bracket comprises two columns (2), and a connecting shaft (12) is fixedly connected to both sides of the turning platform (3). Axle holes corresponding to the connecting shaft (12) are opened on the inner walls of the top ends of the two columns (2), and bushings adapted to the connecting shaft (12) are arranged in the axle holes. A meshing worm wheel (13) and a worm (14) are arranged in one of the columns (2), and the worm wheel (13) is fixedly connected to one end of the connecting shaft (12). The worm (14) is rotatably mounted on the inner walls on both sides of the column (2), and a reducer (15) dynamically connected to one end of the worm (14) is installed on the outer wall of the column (2).

6. The pipe flange welding device according to claim 5, characterized in that: A slewing bearing (9) is fixedly connected inside the turning platform (3), a gear ring (8) is rotatably connected to the slewing bearing (9), the front end face of the gear ring (8) is fixedly connected to the rear end face of the disc seat (4), a servo motor (11) is installed on the rear end face of the turning platform (3), and a gear (10) meshing with the gear ring (8) is connected to the shaft extension end of the servo motor (11).

7. The pipe flange welding device according to claim 1, 2, 5 or 6, characterized in that: The invention also comprises a three-axis moving mechanism, which is installed on one side of the base (1), and comprises a vertical beam (32) and a horizontal beam (33). The side of the vertical beam (32) is vertically slidably connected to a slider (24) plate, and the side of the slider (24) plate is horizontally slidably connected to the horizontal beam (33). The bottom end of the vertical beam (32) is slidably installed on the base (1) according to the axial direction of the welding pipe, and one end of the horizontal beam (33) is connected to a welding head (35).

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