Welding device for welding in narrow space

Abstract

The utility model relates to the field of welding, and provides a welding device for welding in a narrow space. The welding device for welding in the narrow and small space comprises a nozzle, an inclined wire contact tube and a welding wire. The nozzle can vertically extend into the welding space; the inclined wire contact tube is partially inserted into the nozzle in an inclined mode, the extending end of the inclined wire contact tube can be located on one side of an opening in the tail end of the nozzle, a flow guide sleeve is detachably installed on the other side of the opening in the tail end, and the flow guide sleeve can partially shield the opening in the tail end of the nozzle. The welding wire is arranged in the inclined wire contact tube in a penetrating mode and can stretch out of an opening in the tail end of the nozzle so that an electric arc can be formed on one side of the nozzle. According to the welding device for welding in the narrow and small space, the nozzle can directly stretch into the welding space, the welding wire is conveyed to any welding position in the welding space through the inclined wire contact tube, and therefore the flow guide sleeve is additionally arranged on the nozzle to form a lateral gas supply structure, the whole molten pool is reasonably covered with protective gas, and the welding efficiency is improved. The problems of gas turbulence and molten pool protection are solved.

Description

Technical Field

[0001] This utility model relates to the field of welding and provides a welding device for welding in confined spaces. Background Technology

[0002] In the actual welding operations during equipment maintenance, situations often arise where work is carried out in confined spaces due to the installation conditions of the parts to be welded. For example, during the maintenance of train skirt panels, if cracks are found in the connection of the grille, the space is limited because the spacing between the grille panels is generally 20mm to 50mm.

[0003] Welding in confined spaces typically presents the following problems: First, the limited space affects the welding torch's oscillation trajectory. Conventional welding torches cannot achieve a suitable wire feed angle in spaces with widths of 20mm to 50mm, resulting in poor weld accessibility. Second, the shielding gas cannot accurately cover the molten pool in a confined space, leading to porosity and inclusions in the weld. These issues result in poor weld quality, and many defects cannot be repaired by welding. Furthermore, skipping the welding repair step and directly replacing the component presents the following problems: the manufacturing cycle for the new component is long, extending the overall maintenance cycle, and the manufacturing cost of the new component is high. Utility Model Content

[0004] This invention provides a welding device for welding in confined spaces, which solves the problems in related technologies where conventional welding torches cannot form a suitable wire feeding angle in confined spaces, resulting in poor welding accessibility, and where shielding gas cannot accurately cover the molten pool in confined spaces, leading to defects such as porosity and inclusions in the weld.

[0005] The present invention discloses a welding device for welding in confined spaces, comprising: a nozzle capable of vertically extending into the welding space; a beveled wire conductive tip partially inserted into the nozzle at an angle, the protruding end of the beveled wire conductive tip being located on one side of the end opening of the nozzle, and a flow guide sleeve detachably installed on the other side of the end opening, the flow guide sleeve being capable of partially blocking the end opening of the nozzle; and a welding wire threaded through the beveled wire conductive tip, the welding wire being able to extend from the end opening of the nozzle so that an electric arc is formed on one side of the nozzle.

[0006] According to the welding device for welding in confined spaces described in this utility model, the flow guide sleeve includes a mounting plate and a baffle. The mounting plate is connected to one end of the baffle. The mounting plate is connected to the side wall of the nozzle through an adjusting stud. By rotating the adjusting stud, the baffle is driven to move laterally along the end opening of the nozzle to control the opening degree of the end opening.

[0007] According to the welding device for welding in confined spaces described in this utility model, the mounting plate is arranged perpendicularly to the baffle, the mounting plate is parallel to the side wall of the nozzle, and the adjusting stud is vertically inserted through the mounting plate and the side wall of the nozzle.

[0008] According to the welding device for welding in confined spaces described in this utility model, a guide hole is provided on the side wall of the nozzle, and the guide hole is connected to the end opening of the nozzle.

[0009] According to the welding apparatus for welding in confined spaces described in this utility model, the guide hole is located on the side wall of the nozzle away from the guide sleeve.

[0010] According to the welding device for welding in confined spaces described in this utility model, the inclined wire conductive nozzle includes a vertical section and an inclined section. The vertical section is coaxially arranged with the nozzle, and the inclined section is connected to the end of the vertical section. The inclined section is arranged at an angle to the vertical section. The end of the inclined section is located on the side of the nozzle end opening away from the guide sleeve. The welding wire can pass through the vertical section and the inclined section in sequence and extend from the end of the inclined section to the outside of the nozzle.

[0011] According to the welding device for welding in confined spaces described in this utility model, a conductive nozzle seat is provided inside the nozzle, and the vertical section of the inclined wire conductive nozzle is fixed to the conductive nozzle seat.

[0012] According to the welding device for welding in confined spaces described in this utility model, the side wall of the conductive nozzle seat has protective air holes.

[0013] According to the welding apparatus for welding in confined spaces described in this utility model, the welding space includes a base plate and a pair of upright plates, the pair of upright plates being connected to the base plate and having a gap between them; the nozzle is in a state of extending into the welding space, the sidewall of the nozzle is perpendicular to the base plate, and the end opening of the nozzle can face the angle between the base plate and either of the upright plates.

[0014] According to the welding device for welding in confined spaces described in this utility model, the spacing between a pair of upright plates ranges from 20mm to 50mm.

[0015] This utility model provides a welding device for welding in confined spaces, comprising a nozzle, an inclined wire guide tip, and a welding wire. The nozzle can extend vertically into the welding space; the inclined wire guide tip is partially inserted into the nozzle at an angle, with its protruding end positioned on one side of the nozzle's end opening. A flow guide sleeve is detachably installed on the other side of the end opening, partially obstructing the nozzle's end opening; the welding wire passes through the inclined wire guide tip and extends from the nozzle's end opening, allowing an arc to form on one side of the nozzle. During welding, this device allows the nozzle to be directly inserted into the welding space, and the inclined wire guide tip provides oblique wire feeding, thereby delivering the welding wire to any welding position within the welding space, improving welding accessibility. Furthermore, by adding a flow guide sleeve to the nozzle, a lateral gas supply structure is formed, ensuring that the shielding gas effectively covers the entire molten pool, solving the problems of gas turbulence and molten pool protection. This welding device also effectively improves equipment production efficiency and saves manufacturing costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic structural diagram of the welding torch for welding in confined spaces provided by this utility model.

[0018] Figure label:

[0019] 1. First upright plate; 2. Base plate; 3. Second upright plate; 4. Guide sleeve; 5. Adjusting stud; 6. Nozzle; 7. Inclined wire conductive nozzle; 8. Conductive nozzle seat; 9. Inner cavity; 10. End opening; 11. Electric arc; 12. Guide hole; 13. Welding wire; 14. Protective vent. Detailed Implementation

[0020] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0021] like Figure 1 As shown, the welding device for welding in confined spaces (hereinafter referred to as "welding device") described in this embodiment of the present invention includes a nozzle 6, a slanted wire conductive tip 7, and a welding wire 13.

[0022] In this embodiment, as Figure 1As shown, the nozzle 6 can extend vertically into the welding space, preferably a narrow space with a width of not less than 20mm. The inclined wire conductive nozzle 7 is partially inserted into the nozzle 6 at an angle, with its protruding end positioned on one side of the end opening 10 of the nozzle 6. The welding wire 13 passes through the inclined wire conductive nozzle 7 and extends from the end opening 10 of the nozzle 6, allowing the arc 11 to form on one side of the nozzle 6. This ensures that the welding device can directly extend the nozzle 6 into the welding space during welding, using the inclined wire conductive nozzle 7 to feed the wire at an angle, thereby delivering the welding wire 13 to any welding position within the welding space, improving welding accessibility. A flow guide sleeve 4 is detachably installed on the other side of the end opening 10 of the nozzle 6. The flow guide sleeve 4 partially blocks the end opening 10 of the nozzle 6, forming a lateral gas supply structure, ensuring that the shielding gas reasonably covers the entire molten pool, solving the problems of gas turbulence and molten pool protection.

[0023] It should be noted that, in order to achieve the above-mentioned technical effect of oblique wire feeding and reliable welding in a confined space, the welding device described in this embodiment preferably has a spray gun width or diameter smaller than the width of the confined space.

[0024] It should be noted that the welding space described in this embodiment can be any welding position of the equipment. This welding device is suitable for welding aluminum alloy structures. This welding device is compatible with the MIG Arc 11 welding method. During the welding process, the aforementioned smaller diameter welding torch is used as the welding device, and the aforementioned structural settings are configured to achieve a straight torch with an oblique wire feeding structure. This allows the welding device to naturally form a welding angle of 35 to 55 degrees, reducing the influence of obstacles on the sidewalls of the space on the trajectory of the welding torch and solving the welding accessibility problem.

[0025] It should be noted that the welding apparatus described in this embodiment preferably uses pure argon as the shielding gas for MIG arc 11 brazing during the welding process.

[0026] In some embodiments, the welding torch of this welding device is connected to the welding equipment via a flexible tube, i.e., a gooseneck for the welding torch is made using a flexible tube. This, combined with the aforementioned straight torch inclined wire feeding structure, effectively overcomes the limitation of ordinary welding torches in changing their shape. This welding device can adjust the welding torch posture as needed according to the site conditions, thereby achieving shape control of the straight torch portion at different depths in confined spaces. This facilitates achieving the required welding angle and ensuring welding accessibility.

[0027] In some embodiments, such as Figure 1As shown, the welding space includes a base plate 2 and a pair of upright plates connected to the base plate 2, with a gap between them. Preferably, the gap between the pair of upright plates is between 20mm and 50mm, thus forming the aforementioned narrow space. The nozzle 6 is inserted into the welding space, with its sidewalls perpendicular to the base plate 2, and its end opening 10 facing the angle between the base plate 2 and either upright plate, thereby enabling welding of difficult locations within the narrow space.

[0028] In some specific embodiments, such as Figure 1 As shown, a pair of upright plates includes a first upright plate 1 and a second upright plate 3. The first upright plate 1 and the second upright plate 3 are arranged parallel to each other at intervals, and are respectively perpendicularly connected to the base plate 2. A certain width, greater than or equal to 20mm, is left between the first upright plate 1 and the second upright plate 3 to form the aforementioned narrow space, i.e., the welding space. Figure 1 For example, the angle between the first vertical plate 1 and the base plate 2 is the area to be welded. The inclined wire contact tip 7 is tilted towards the first vertical plate 1 to deliver the welding wire 13 at an angle to the area to be welded, forming an arc 11. Since the welding wire 13 forms an angle of less than 90 degrees with the first vertical plate 1, the shielding gas can more comprehensively cover the position where the welding wire 13 forms the arc 11, so that the shielding gas can reasonably cover the entire molten pool, solving the problems of gas turbulence and molten pool protection.

[0029] It should be noted that in the welding apparatus described in this embodiment, the straight-gun state of the spray gun is preferably achieved by adjusting the gooseneck of the flexible tube to make the nozzle 6 parallel to the vertical plate of the welding space. However, within the allowable width of the welding space (ensuring that the spray gun does not contact the workpiece), the nozzle 6 and the vertical plate on the corresponding side can form any angle.

[0030] In some embodiments, the inclined wire contact nozzle 7 includes a vertical section and an inclined section. The vertical section is coaxially arranged with the nozzle 6. The inclined section is connected to the end of the vertical section. This arrangement enables the welding wire 13 in the inclined contact nozzle to be obliquely delivered to the welding location. Preferably, the inclined section is arranged at an angle to the vertical section to achieve oblique wire feeding with the shortest path and improve wire feeding efficiency. The end of the inclined section is located on the side of the nozzle 6 end opening 10 away from the guide sleeve 4. The welding wire 13 can pass through the vertical section and the inclined section in sequence and extend out of the nozzle 6 from the end of the inclined section. In the energized state, the welding wire 13 contacts the first vertical plate 1 or the base plate 2 and ignites the electric arc 11. The electric arc 11 acts as a heat source, and the welding wire 13 melts with the first vertical plate 1 and the base plate 2 to form a molten pool, which solidifies to form a weld. During the welding process, the welding device uses the guide sleeve 4 to guide the shielding gas to cover the molten pool formed by the electric arc 11.

[0031] It should be noted that the oblique wire state or oblique wire feeding described in this embodiment refers to the welding wire 13 extending outward after passing through the vertical and oblique sections of the oblique wire conductive nozzle 7, forming an angle of 40 to 50 degrees with the axis of the nozzle 6. This angle range ensures that the nozzle 6 is fed into the narrow welding space in a straight tube state, while the welding wire 13 can accurately reach the welding point at an oblique angle, improving welding accessibility.

[0032] It should be noted that the oblique wire conductive nozzle 7 described in this embodiment can be formed by 3D printing or by hot bending.

[0033] In some specific embodiments, such as Figure 1 As shown, a conductive nozzle seat 8 is inserted inside the nozzle 6. The end of the oblique wire conductive nozzle 7 away from its protruding end is fixed to the conductive nozzle seat 8. That is, the vertical section of the oblique wire conductive nozzle 7 is fixed to the conductive nozzle seat 8. This arrangement ensures that the oblique wire conductive nozzle 7 is relatively fixedly installed inside the nozzle 6, improving welding safety. After the oblique wire conductive nozzle 7 is installed into the conductive nozzle seat 8, power is applied and the welding wire 13 is extended to verify the installation effect of the oblique wire conductive nozzle 7. In this embodiment, the protruding end of the oblique wire conductive nozzle 7 has an opening facing the guide hole 12 to ensure that the extended welding wire 13 can pass through the connection position between the guide hole 12 and the end opening 10 of the nozzle 6, thereby reaching the area to be welded.

[0034] In some specific embodiments, a protective gas hole 14 is provided on the side wall of the conductive nozzle seat 8. During welding, the protective gas flows out from the protective gas hole 14 through the inner cavity 9 of the nozzle 6, and after being guided by the flow guide hole 12 and the flow guide sleeve 4, it is ejected from the outlet formed by the end opening 10 of the nozzle 6 and the flow guide hole 12, forming a protective gas shield around the electric arc 11 and the molten pool, preventing harmful gases from entering the molten pool and forming pores in the weld.

[0035] In some embodiments, such as Figure 1 As shown, a guide hole 12 is formed on the side wall of the nozzle 6. The guide hole 12 communicates with the end opening 10 of the nozzle 6. The guide hole 12 can further increase the gas delivery range of the shielding gas, allowing the shielding gas to cover the entire molten pool more comprehensively. In particular, it effectively stabilizes the gas turbulence above the arc 11, providing further reliable protection for the molten pool. Preferably, the guide hole 12 is located on the side wall of the nozzle 6 away from the guide sleeve 4, so that the guide sleeve 4 can guide and deliver the shielding gas in the direction of the welding wire 13, preventing the shielding gas from escaping.

[0036] In some specific embodiments, it is preferable to have an elliptical guide hole 12 formed on the side wall of the nozzle 6. The guide hole 12 is a hole formed by the intersection of the nozzle 6 and a cylinder with the protruding part of the welding wire 13 as the axis. The shape of the guide hole 12 is used to constrain the airflow direction, thereby guiding the protective airflow and allowing the airflow to cover the molten pool with a more reasonable coverage area.

[0037] In some specific embodiments, the flow guide sleeve 4 preferably has a crescent-shaped notch formed by the intersection of the cylinder with the axis of the protruding portion of the welding wire 13. The flow guide hole 12 of the nozzle 6 and the crescent-shaped notch on the flow guide sleeve 4 combine to form an outlet for the protective gas, which is generally circular in shape, so as to more comprehensively cover the molten pool.

[0038] In some embodiments, such as Figure 1 As shown, the guide sleeve 4 includes a mounting plate and a baffle. The mounting plate is connected to one end of the baffle. The mounting plate is connected to the side wall of the nozzle 6 via an adjusting stud 5. By rotating the adjusting stud 5, the baffle is driven to move laterally along the end opening 10 of the nozzle 6 to control the opening degree of the end opening 10.

[0039] In some specific embodiments, the mounting plate and the baffle are preferably arranged perpendicularly. That is, the mounting plate and the baffle are connected to form an L-shaped structure. The mounting plate is parallel to the side wall of the nozzle 6, and the adjusting stud 5 is perpendicularly inserted through the mounting plate and the side wall of the nozzle 6. By rotating the adjusting stud 5, the mounting plate can be driven away from or closer to the side wall of the nozzle 6, and the mounting plate can be moved radially at the end opening 10 of the nozzle 6 (i.e., as shown). Figure 1 (as shown by the transverse movement), thereby adjusting the opening degree of the end opening 10 of the nozzle 6 and guiding the protective gas to converge toward the guide orifice 12.

[0040] It should be noted that, in the assembly process before welding, the inclined wire conductive nozzle 7 needs to be installed on the conductive nozzle seat 8 in the nozzle 6 before the flow guide sleeve 4 can be installed into the mounting hole on the side wall of the nozzle 6 through the adjusting stud 5.

[0041] It should be noted that, in addition to the adjustable stud installation described above, the installation structure of the guide sleeve 4 in this embodiment can also be achieved by directly making the guide sleeve 4 into a clamp-type structure and fixing it to the end of the nozzle 6 as an alternative installation structure.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A welding apparatus for welding in confined spaces, characterized in that, include: The nozzle can extend vertically into the welding space; A slanted wire conductive nozzle is partially inserted into the nozzle at an angle. The protruding end of the slanted wire conductive nozzle can be located on one side of the end opening of the nozzle. A flow guide sleeve is detachably installed on the other side of the end opening. The flow guide sleeve can partially block the end opening of the nozzle. The welding wire is threaded through the inclined wire conductive nozzle and can extend from the end opening of the nozzle so that an electric arc is formed on one side of the nozzle.

2. The welding apparatus for welding in confined spaces according to claim 1, characterized in that, The flow guide sleeve includes a mounting plate and a baffle. The mounting plate is connected to one end of the baffle. The mounting plate is connected to the side wall of the nozzle through an adjusting stud. By rotating the adjusting stud, the baffle is driven to move laterally along the end opening of the nozzle to control the opening degree of the end opening.

3. The welding apparatus for welding in confined spaces according to claim 2, characterized in that, The mounting plate is perpendicular to the baffle and parallel to the side wall of the nozzle. The adjusting stud is perpendicularly inserted through the mounting plate and the side wall of the nozzle.

4. The welding apparatus for welding in confined spaces according to claim 1, characterized in that, The nozzle has a flow guide hole on its side wall, and the flow guide hole is connected to the end opening of the nozzle.

5. The welding apparatus for welding in confined spaces according to claim 4, characterized in that, The flow guide hole is located on the side wall of the nozzle, away from the flow guide sleeve.

6. The welding apparatus for welding in confined spaces according to claim 1, characterized in that, The inclined wire conductive nozzle includes a vertical section and an inclined section. The vertical section is coaxially arranged with the nozzle, and the inclined section is connected to the end of the vertical section. The inclined section is arranged at an angle to the vertical section. The end of the inclined section is located on the side of the nozzle end opening away from the flow guide sleeve. The welding wire can pass through the vertical section and the inclined section in sequence and extend out of the nozzle from the end of the inclined section.

7. The welding apparatus for welding in confined spaces according to claim 6, characterized in that, A conductive nozzle seat is inserted inside the nozzle, and the vertical section of the oblique wire conductive nozzle is fixed to the conductive nozzle seat.

8. The welding apparatus for welding in confined spaces according to claim 7, characterized in that, The conductive nozzle seat has protective air holes on its side wall.

9. The welding apparatus for welding in confined spaces according to any one of claims 1 to 8, characterized in that, The welding space includes a base plate and a pair of upright plates, the pair of upright plates being connected to the base plate, and a gap being left between the pair of upright plates; The nozzle is in a state of extending into the welding space, the sidewall of the nozzle is perpendicular to the base plate, and the end opening of the nozzle can face the angle between the base plate and any of the upright plates.

10. The welding apparatus for welding in confined spaces according to claim 9, characterized in that, The spacing between a pair of the uprights ranges from 20mm to 50mm.

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