Welding gun angle adjusting structure and automatic pipeline welding device and method

Abstract

The invention relates to a welding gun angle adjusting structure and an automatic pipeline welding device and method, and relates to the technical field of automatic welding. The welding gun angle adjusting structure comprises a trolley connecting piece, a welding gun connecting piece and a positioning piece. The trolley connecting piece is used for being connected with a walking trolley. One side of the welding gun connecting piece is rotationally connected with the trolley connecting piece, and the other side is connected with an automatic welding gun; the positioning piece is used for limiting rotation between the trolley connecting piece and the welding gun connecting piece; the welding gun connecting piece can rotate relative to the trolley connecting piece so as to adjust the swing direction of the automatic welding gun. According to the technical scheme, the problems that when an existing inclined pipeline is welded, the defects of undercut, insufficient filling metal and the like are caused by lack of weld metal on the upper pipe opening side, and the defects of incomplete fusion of the side wall, slag inclusion, too thick filling metal and the like are caused by excessive flowing liquid metal on the lower pipe opening side can be solved; and the welding quality and efficiency of the inclined pipeline are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automated welding, and in particular to a welding gun angle adjustment structure, a pipeline automatic welding device and a method. Background Art

[0002] Welding, also known as fusion, is a manufacturing process and technology that joins metals or other thermoplastic materials such as plastics by heating, high temperature or high pressure. The mechanization and automation of the welding process is automatic welding.

[0003] When automatic welding is performed on pipelines laid in mountainous and hilly areas, the swing direction of the automatic welding gun is usually parallel to the pipeline, or moves in a zigzag shape with the pipeline. When welding inclined pipelines, the liquid metal in the weld is easy to flow from the upper pipe mouth to the lower pipe mouth under the action of gravity. After the weld metal cools, the upper pipe mouth side has defects such as undercut and insufficient filler metal due to lack of weld metal, and the lower pipe mouth side has defects such as unfused side wall, slag inclusion and excessive filler metal due to excessive liquid metal flowing down. Summary of the invention

[0004] The embodiments of the present invention provide a welding gun angle adjustment structure, an automatic pipeline welding device and method, which can solve the problems existing in the conventional welding of inclined pipelines, such as undercut and insufficient filler metal on the upper pipe mouth side due to lack of weld metal, and defects such as unfused side walls, slag inclusions and excessive filler metal on the lower pipe mouth side due to excessive liquid metal flowing down.

[0005] In a first aspect, an embodiment of the present application provides a welding gun angle adjustment structure, comprising:

[0006] A trolley connector, used to connect with the traveling trolley;

[0007] A welding gun connecting piece, one side of which is rotatably connected to the trolley connecting piece, and the other side of which is used to connect to an automatic welding gun; and

[0008] A positioning member, used to limit the rotation between the trolley connecting member and the welding gun connecting member;

[0009] Wherein, the welding gun connecting piece can rotate relative to the trolley connecting piece to adjust the swing direction of the automatic welding gun.

[0010] In one embodiment, the welding gun connecting member includes a welding gun rotating section and a welding gun fixed section; the welding gun fixed section is height-adjustably connected relative to the welding gun rotating section, and the welding gun rotating section is rotatably connected to the trolley connecting member.

[0011] In one embodiment, the positioning member is a positioning bolt.

[0012] In a second aspect, an embodiment of the present application provides an automatic pipeline welding device, comprising a welding track, a welding trolley, a welding gun angle adjustment structure as described in any embodiment of the first aspect, and an automatic welding gun.

[0013] In a third aspect, an embodiment of the present application provides a pipeline automatic welding method, which is applied to the pipeline automatic welding device as described in the second aspect, comprising:

[0014] Bevel the upper and lower pipe ends of the pipe to be welded to form a symmetrical single V-shaped bevel;

[0015] Preheating the grooves of the upper pipe opening and the lower pipe opening, the preheating temperature is 100°C to 150°C, and the preheating width is not less than 75mm on both sides of the groove;

[0016] Manual tungsten inert gas arc welding is used to perform upward root welding on the upper pipe opening and the lower pipe opening;

[0017] The upper pipe opening and the lower pipe opening are heat welded by manual tungsten inert gas arc welding;

[0018] Installing the pipeline automatic welding device on the pipeline to be welded, and adjusting the welding gun angle adjustment structure to make the automatic welding gun swing in the horizontal direction;

[0019] The pipeline automatic welding device is used to perform flux-cored wire gas shielded automatic welding on the pipeline to be welded.

[0020] In one embodiment, the angle of the single V-shaped groove is 23.5° to 24.5°.

[0021] In one embodiment, the preheating of the grooves of the upper pipe opening and the lower pipe opening, the preheating temperature is 100° C. to 150° C., and the preheating width is not less than 75 mm on both sides of the groove, further includes:

[0022] The upper pipe opening and the lower pipe opening are assembled by using an external pipe assembly tool, and the assembly gap is 3mm to 4mm.

[0023] In one embodiment, the automatic pipeline welding device is installed on the pipeline to be welded, and the welding gun angle adjustment structure is adjusted to make the automatic welding gun swing in a horizontal direction, including:

[0024] The welding track is installed on the upper pipe mouth, and the welding trolley is installed on the welding track, wherein the welding trolley can move along the welding track; the inclination angle of the pipe to be welded is measured; and the welding gun angle adjustment structure is adjusted based on the inclination angle so that the automatic welding gun swings in the horizontal direction.

[0025] In one embodiment, the process parameters of the flux-cored gas shielded automatic welding are: flux-cored wire diameter 1.2mm, welding voltage 22V~24V, wire feeding speed 220in / min~270in / min, wire dry extension length 8mm~15mm, welding speed 17cm / min~23cm / min, residence time on both sides of the groove 100ms~400ms, swing width 3.5mm~7.5mm, swing frequency 55 times / min~75 times / min, and mixed gas flow rate 30L / min~45L / min.

[0026] In one embodiment, the use of the pipeline automatic welding device to perform flux-cored gas shielded automatic welding on the pipeline to be welded includes: if the flux-cored gas shielded automatic welding is a filling weld, and the width of the filling layer is greater than a preset width, then welding is performed from the lower pipe opening to the upper pipe opening; if the flux-cored gas shielded automatic welding is a cover weld, and the width of the cover layer is greater than a preset width, then welding is performed from the upper pipe opening to the lower pipe opening.

[0027] Compared with the prior art, the embodiment of the present application provides a trolley connector and a welding gun connector, and rotatably connects the trolley connector and the welding gun connector. By adjusting the welding gun connector, the automatic welding gun can be swung in a horizontal direction. By providing a positioning piece, the automatic welding gun can be swung in a horizontal direction and then the rotation between the trolley connector and the welding gun connector can be restricted. This can solve the problems existing in the prior art of welding inclined pipelines, such as undercut and insufficient filler metal on the upper pipe mouth side due to lack of weld metal, and defects such as unfused side walls, slag inclusions and excessively thick filler metal on the lower pipe mouth side due to excessive liquid metal flowing down, thereby improving the welding quality and efficiency of inclined pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Hereinafter, the present invention will be described in more detail based on embodiments and with reference to the accompanying drawings.

[0029] Figure 1 is a schematic diagram of a welding gun angle adjustment structure provided by an embodiment of the present invention;

[0030] Figure 2 It is a schematic diagram of the structure of a trolley connecting piece provided by an embodiment of the present invention;

[0031] Figure 3 It is a schematic diagram of the structure of a welding connector provided by an embodiment of the present invention;

[0032] Figure 4 It is a schematic diagram of the welding gun angle adjustment structure and the automatic welding gun assembly provided by an embodiment of the present invention;

[0033] Figure 5 It is a structural schematic diagram of a pipeline automatic welding device provided by an embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of automatic pipeline welding provided by an embodiment of the present invention;

[0035] Figure 7 is a schematic diagram of automatic pipeline welding provided by another embodiment of the present invention;

[0036] Figure 8 This is a flow chart of a pipeline automatic welding method provided by an embodiment of the present invention;

[0037] Fig. 9 It is a schematic diagram of the automatic welding direction of a pipeline provided by an embodiment of the present invention.

[0038] Reference numerals:

[0039] 10. Welding gun angle adjustment structure; 110. Trolley connector; 1101. Trolley fixed section; 1102. Trolley rotating section; 120. Welding gun connector; 1201. Welding gun rotating section; 1202. Welding gun fixed section; 20. Welding bracket; 30. Welding track; 40. Welding trolley; 50. Automatic welding gun; 510. Welding gun swing mechanism; 520. Welding gun head; 60. Pipe to be welded; 610. Upper pipe opening; 620. Lower pipe opening. DETAILED DESCRIPTION

[0040] The present invention will be further described below in conjunction with the accompanying drawings.

[0041] When automatic welding is performed on metal pipes in mountainous and hilly areas, the liquid weld metal at the weld is likely to flow from the upper pipe end to the lower pipe end under the action of gravity, resulting in defects such as undercut and insufficient filler metal at the upper pipe end due to lack of weld metal after the liquid weld metal cools down, and defects such as unfused side walls, slag inclusions and excessive filler metal at the lower pipe end due to excessive liquid weld metal flowing down. As a result, the welding quality is difficult to guarantee when welding pipelines in mountainous and hilly areas.

[0042] Usually, the inclination angle of long-distance pipelines in mountainous and hilly areas is between 0° and 45°. During the automatic welding process, the automatic welding gun is designed to swing in a zigzag motion parallel to the pipeline axis. This automatic welding gun will not have an adverse effect on the welding quality when welding in plain areas, but as the slope of mountainous areas increases, the pipeline needs to be automatically welded in an inclined state. When the pipeline is automatically welded in an inclined state, the liquid weld metal will flow from the upper pipe mouth to the lower pipe mouth faster, causing defects such as weld grooves, undercuts, and poor weld formation.

[0043] First, in response to the above technical issues, such as Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, this embodiment provides a welding gun angle adjustment structure 10, comprising:

[0044] A trolley connector 110, used to connect with the traveling trolley;

[0045] A welding gun connector 120, one side of which is rotatably connected to the trolley connector 110, and the other side of which is used to connect to the automatic welding gun 50; and

[0046] A positioning member, used to limit the rotation between the carriage connecting member 110 and the welding gun connecting member 120;

[0047] The welding gun connecting member 120 can rotate relative to the trolley connecting member 110 to adjust the swing direction of the automatic welding gun 50 .

[0048] It should be noted that the trolley connecting member 110 includes a trolley fixed section 1101 and a trolley rotating section 1102, wherein the trolley fixed section 1101 is used to be connected to the traveling trolley to drive the automatic welding gun 50 connected to the welding gun connecting member 120 to move, wherein the trolley fixed section 1101 and the traveling trolley are detachably connected, such as by bolt connection, clamping, etc.; the trolley rotating section 1102 is provided with a rotating shaft, and the trolley connecting member 110 is connected to the welding gun connecting member 120 via the rotating shaft.

[0049] It should be noted that, since the welding gun connector 120 is connected to the automatic welding gun 50, when the welding gun connector 120 rotates relative to the trolley connector 110, the automatic welding gun 50 will rotate with the welding gun connector 120, so that the swing direction of the automatic welding gun 50 can be adjusted, that is, the swing direction of the automatic welding gun 50 can be made parallel to the horizontal plane (such as Figure 6 ), rather than the automatic welding gun 50 designed to swing parallel to the pipeline axis when it leaves the factory (as shown in FIG. Figure 7 As shown, when the swing direction of the automatic welding gun 50 is parallel to the pipeline axis and the pipeline is welded at an angle, the welding pool is parallel to the pipeline axis. At this time, the liquid metal in the weld will flow from the upper pipe mouth 610 along the welding pool to the lower pipe mouth 620, and the swing direction of the automatic welding gun 50 is parallel to the horizontal plane, and when the pipeline is welded at an angle, the welding pool is parallel to the horizontal plane. At this time, the liquid metal in the weld will flow vertically downward from the welding pool and will not flow to the lower pipe mouth 620. There is greater resistance when flowing vertically downward, which can reduce the outflowing liquid metal, thereby solving the problems of undercut and insufficient filler metal on the upper pipe mouth 610 side due to lack of weld metal during the existing inclined pipeline welding, and defects such as unfused side walls, slag inclusions and excessively thick filler metal on the lower pipe mouth 620 side due to excessive liquid metal flowing down, thereby improving the welding quality and efficiency of the inclined pipeline.

[0050] In some embodiments, the welding gun connector 120 includes a welding gun rotating section 1201 and a welding gun fixed section 1202 ; the welding gun fixed section 1202 is height-adjustably connected relative to the welding gun rotating section 1201 , and the welding gun rotating section 1201 is rotatably connected to the trolley connector 110 .

[0051] It should be noted that the left side of the welding gun connecting part 120 is the welding gun rotating section 1201, and the welding gun rotating section 1201 is rotatably connected to the trolley rotating section 1102. The right side of the welding gun connecting part 120 is the welding gun fixed section 1202, and the welding gun fixed section 1202 is used to be connected to the automatic welding gun 50. The welding gun fixed section 1202 and the automatic welding gun 50 can be detachably connected, such as bolted, clamped, etc.

[0052] It should be noted that the height of the welding gun fixing section 1202 can be adjusted by the height-adjustable connection between the welding gun fixing section 1202 and the welding gun rotating section 1201, and then the height of the automatic welding gun 50 can be adjusted. The height-adjustable connection can be implemented by making the welding gun rotating section 1201 and the welding gun fixing section 1202 slidingly connected, so that the welding gun fixing section 1202 can move in the thickness direction of the welding gun rotating section 1201, and the welding gun fixing section 1202 can be locked at different heights by fasteners, etc. The height of the welding gun fixing section 1202 can be adjusted manually, and the height of the welding gun fixing section 1202 can also be adjusted by electric, hydraulic, pneumatic, etc.

[0053] In some embodiments, the locating member is a locating bolt.

[0054] It should be noted that the use of positioning bolts can simply and conveniently limit the relative rotation between the trolley connector 110 and the welding gun connector 120. Other positioning methods can also be used to limit the relative rotation between the trolley connector 110 and the welding gun connector 120. The embodiments of the present application do not make specific limitations on this.

[0055] In summary, the embodiment of the present application provides a trolley connector 110 and a welding gun connector 120, and makes the trolley connector 110 rotatably connected to the welding gun connector 120, so that the automatic welding gun 50 can be swung in a horizontal direction by adjusting the welding gun connector 120, and the rotation between the trolley connector 110 and the welding gun connector 120 can be limited after the automatic welding gun 50 is swung in the horizontal direction by providing a positioning member, which can solve the defects of undercut and insufficient filler metal on the upper pipe mouth 610 side due to lack of weld metal during the existing inclined pipeline welding, and defects such as unfused side walls, slag inclusions and excessively thick filler metal on the lower pipe mouth 620 side due to excessive liquid metal flowing down, thereby improving the welding quality and efficiency of the inclined pipeline.

[0056] Second, as Figure 5As shown, this embodiment provides an automatic pipeline welding device, including a welding track 30, a welding carriage 40, a welding gun angle adjustment structure 10 as described in any embodiment of the first aspect, and an automatic welding gun 50.

[0057] It should be noted that the welding bracket 20 is used to support the pipe 60 to be welded and adjust it to a required inclination angle. The specific form and structure of the welding bracket 20 are not specifically limited in this embodiment.

[0058] It should be noted that when performing automatic welding, the welding track 30 needs to be installed on the pipe to be welded 60, and the welding track 30 is fixed by tightening the locking pin. A plurality of positioning blocks are arranged on the inner side of the welding track 30. The positioning blocks can make a preset gap between the welding track 30 and the pipe to be welded 60. One side of the welding track 30 has threaded connecting teeth, and the threaded connecting teeth are used to connect with the welding trolley 40; a driving device is provided on the welding trolley 40, and the driving device is threadedly connected to the threaded connecting teeth of the welding track 30 to drive the welding trolley 40 to move along the welding track 30.

[0059] It should be noted that the right side of the welding trolley 40 is connected to the trolley fixed section 1101 of the trolley connector 110, thereby driving the automatic welding gun 50 connected to the welding gun connector 120 to move along the welding track 30, wherein the automatic welding gun 50 includes a welding gun swing mechanism 510 and a welding gun head 520, and the welding gun swing mechanism 510 is used to drive the welding gun head 520 to swing, and usually the welding gun swing mechanism 510 drives the welding gun head 520 to swing in the left and right directions.

[0060] It should be noted that the automatic pipeline welding device may also include an angle / slope measuring instrument and an automatic angle adjustment mechanism. The angle / slope measuring instrument can measure the inclination angle of the pipeline 60 to be welded. The automatic angle adjustment mechanism is used to adjust the welding gun angle adjustment structure 10 according to the inclination angle measured by the angle / slope measuring instrument, so that the automatic welding gun 50 swings in the horizontal direction, so as to further realize the automation of inclined pipeline welding.

[0061] It should be noted that when using the automatic pipeline welding device, the inclination angle of the pipeline 60 to be welded can be measured first, and then the welding gun angle adjustment structure 10 can be adjusted to make the swing direction of the welding gun head 520 parallel to the horizontal plane, and then the relevant welding parameters can be set for automatic welding. In this way, the defects of the upper pipe mouth 610 side due to lack of weld metal and insufficient filler metal, and the defects of the lower pipe mouth 620 side due to excessive liquid metal flowing down, such as unfused side walls, slag inclusions and excessive filler metal, which exist in the existing inclined pipeline welding can be solved, thereby improving the welding quality and efficiency of the inclined pipeline.

[0062] Thirdly, in response to the above technical issues, such as Figure 8As shown, this embodiment provides a pipeline automatic welding method, which is applied to the pipeline automatic welding device as described in any embodiment of the second aspect, including:

[0063] S101: performing groove processing on the upper pipe opening 610 and the lower pipe opening 620 of the pipe to be welded 60 to form a symmetrical single V-shaped groove;

[0064] In some embodiments, the angle of the single V-groove is 23.5° to 24.5°.

[0065] It should be noted that the bevel is usually opened by using a beveling machine, manual grinding, etc. Usually the V-shaped bevel can be processed in the manufacturing plant without the need for on-site processing at the construction site, which can reduce the workload of on-site welding and improve welding efficiency. This embodiment does not specifically limit the specific method of opening the bevel.

[0066] S102: preheating the upper pipe opening 610 and the lower pipe opening 620 at a preheating temperature of 100° C. to 150° C. and a preheating width of not less than 75 mm on both sides of the groove;

[0067] It should be noted that preheating before welding can reduce the cooling rate of the weld joint, avoid the formation of hardened structure, reduce welding stress and deformation, and prevent welding cracks. The preheating temperature and preheating width can be appropriately adjusted according to the material and thickness of the pipe 60 to be welded, and the medium frequency can be used to preheat the pipe 60 to be welded.

[0068] In some embodiments, the grooves of the upper pipe opening 610 and the lower pipe opening 620 are preheated at a temperature of 100°C to 150°C, and the preheating width is not less than 75mm on both sides of the groove. It also includes: using an external pipe jointer to mate the upper pipe opening 610 and the lower pipe opening 620, and the mate gap is 3mm to 4mm.

[0069] It should be noted that the assembly quality has an important impact on the welding quality. The pipe external joint device can be used to assemble the pipe 60 to be welded to ensure the assembly quality. The assembly gap can be adjusted according to the material and thickness of the pipe 60 to be welded.

[0070] S103: Performing upward root welding on the upper pipe opening 610 and the lower pipe opening 620 by manual tungsten inert gas arc welding;

[0071] It should be noted that root welding is the base welding. When performing upward root welding, the arc is welded from bottom to top, which is called upward vertical welding. When using upward vertical welding, the penetration depth is greater, the welding line energy is increased, and the penetration is reliable.

[0072] It should be noted that if Fig. 9As shown, when performing upward root welding, the bottom of the pipe 60 to be welded can be welded upward from both left and right directions. At this time, the molten pool formed is smaller, and the molten pool always moves with the arc. The metal in the front molten pool also solidifies at the same time, ensuring that the molten pool does not flow.

[0073] It should be noted that the shielding gas for manual tungsten inert gas welding is 100% Ar, and the purity of Ar gas is ≥99.96%. It has the characteristics of easy arc starting, low price, inertness, etc., which can well ensure the welding quality. Among them, the welding wire specification selected for manual tungsten inert gas welding is Φ2.4mm. After the upward root welding, manual tungsten inert gas welding can be used to fill the root gap between the upper pipe mouth 610 and the lower pipe mouth 620.

[0074] S104: thermally welding the upper pipe opening 610 and the lower pipe opening 620 by manual tungsten inert gas arc welding;

[0075] It should be noted that hot welding refers to the second layer of weld that is performed quickly after the root welding is completed. Hot welding can increase the thickness of the weld metal, prevent the occurrence of cold cracks and burn-through of the root weld. At the same time, hot welding can accelerate the escape of H in the weld metal and greatly reduce the H content in the weld and heat-affected zone.

[0076] It should be noted that hot welding uses manual tungsten inert gas arc welding, and the time interval between hot welding and upward root welding is usually less than or equal to 15 minutes. If the interval is too long, cracks are likely to occur.

[0077] S105: Install the pipeline automatic welding device on the pipeline to be welded 60, and adjust the welding gun angle adjustment structure 10 to make the automatic welding gun 50 swing in the horizontal direction;

[0078] In some embodiments, the pipeline automatic welding device is installed on the pipeline to be welded 60, and the welding gun angle adjustment structure 10 is adjusted to make the automatic welding gun 50 swing in the horizontal direction, including: installing the welding track 30 on the upper pipe mouth 610, and installing the welding trolley 40 on the welding track 30, wherein the welding trolley 40 can move along the welding track 30; measuring the inclination angle of the pipeline to be welded 60; adjusting the welding gun angle adjustment structure 10 based on the inclination angle, so that the automatic welding gun 50 swings in the horizontal direction.

[0079] It should be noted that one side of the welding track 30 has threaded connecting teeth, which are used to connect to the welding trolley 40; the welding trolley 40 is provided with a driving device, which is threadedly connected to the threaded connecting teeth of the welding track 30 to drive the welding trolley 40 to move along the welding track 30. The slope of the pipeline to be measured can be measured by an angle measuring device such as a slope measuring instrument. This embodiment does not specifically limit the device for measuring the slope of the pipeline to be measured.

[0080] It should be noted that two welding carriages 40 can be installed at the same time, so that during automatic welding, welding can be performed from the bottom of the pipe 60 to be welded to both sides and upward at the same time, so as to reduce welding deformation and improve welding efficiency.

[0081] S106: Perform flux-cored gas shielded automatic welding on the pipeline 60 to be welded using a pipeline automatic welding device.

[0082] In some embodiments, the process parameters of flux-cored gas shielded automatic welding are: flux-cored wire diameter 1.2mm, welding voltage 22V~24V, wire feeding speed 220in / min~270in / min, wire dry extension length 8mm~15mm, welding speed 17cm / min~23cm / min, dwell time on both sides of the groove 100ms~400ms, swing width 3.5mm~7.5mm, swing frequency 55 times / min~75 times / min, and mixed gas flow rate 30L / min~45L / min.

[0083] It should be noted that the process parameters of the above-mentioned flux-cored wire gas shielded automatic welding can meet the welding needs of most inclined metal pipes, and the process parameters of the above-mentioned flux-cored wire gas shielded automatic welding can also be adjusted according to actual conditions. The shielding gas of the flux-cored wire gas shielded automatic welding is (78-82)% Ar + (18-22)% CO 2 , Ar gas purity ≥ 99.96%, CO 2 Gas purity ≥99.5%.

[0084] In some embodiments, a pipeline automatic welding device is used to perform flux-cored gas shielded automatic welding on the pipeline 60 to be welded, including: if the flux-cored gas shielded automatic welding is a filling weld, and the width of the filling layer is greater than the preset width, welding is performed from the lower pipe opening 620 to the upper pipe opening 610; if the flux-cored gas shielded automatic welding is a cover weld, and the width of the cover layer is greater than the preset width, welding is performed from the upper pipe opening 610 to the lower pipe opening 620.

[0085] It should be noted that the preset width is usually 13 mm, and the preset width can be adjusted as needed. When performing filling welding, welding is performed from the lower pipe mouth 620 to the upper pipe mouth 610. When performing the first filling weld, the groove surface of the lower pipe mouth 620 can be used as a step to prevent the liquid metal of the welding from flowing downward. When performing the second filling weld on the weld of the first filling weld, the first weld can be used as a step to prevent the liquid metal of the second weld from flowing downward; then the remaining filling welds are performed in sequence, so as to avoid defects such as grooves, undercuts, and poor forming.

[0086] It should be noted that when performing the cap welding, the welding is carried out from the upper pipe mouth 610 to the lower pipe mouth 620. When the first cap welding is performed, the temperature of the upper pipe mouth 610 is relatively low, and the fluidity of the liquid metal in the weld is relatively low, so it is not easy to produce defects such as undercuts. In addition, when the first cap welding is located at the top, the highest point in the center of the weld is biased towards the lower pipe mouth 620. When the second cap welding is performed, the second cap welding is just pressed at the highest point of the first weld, so it is not easy to have defects such as weld grooves and poor forming.

[0087] In summary, the present embodiment provides a pipeline automatic welding method, which forms a symmetrical single V-shaped groove by performing groove processing on the upper pipe mouth 610 and the lower pipe mouth 620 of the pipe to be welded 60; preheating the groove of the upper pipe mouth 610 and the lower pipe mouth 620, the preheating temperature is 100°C to 150°C, and the preheating width is not less than 75mm on both sides of the groove; manual tungsten inert gas arc welding is used to perform upward root welding on the upper pipe mouth 610 and the lower pipe mouth 620; manual tungsten inert gas arc welding is used to perform heat welding on the upper pipe mouth 610 and the lower pipe mouth 620; the pipeline is automatically welded. The automatic welding device is installed on the pipeline to be welded 60, and the welding gun angle adjustment structure 10 is adjusted to make the automatic welding gun 50 swing in the horizontal direction; the pipeline automatic welding device is used to perform flux-cored wire gas shielded automatic welding on the pipeline to be welded 60, which can solve the defects of undercut and insufficient filler metal on the upper pipe mouth 610 side due to lack of weld metal during the existing inclined pipeline welding, and the defects of unfused side wall, slag inclusion and excessive filler metal on the lower pipe mouth 620 side due to excessive liquid metal flowing down, thereby improving the welding quality and efficiency of the inclined pipeline.

[0088] It should be understood that, in the description of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of the present invention, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features not being in direct contact but being in contact through another feature between them.

[0089] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0090] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0091] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0092] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A welding gun angle adjustment structure, characterized in that: include: A trolley connector, used to connect with the traveling trolley; A welding gun connecting piece, one side of which is rotatably connected to the trolley connecting piece, and the other side of which is used to connect to an automatic welding gun; as well as A positioning member, used to limit the rotation between the trolley connecting member and the welding gun connecting member; Wherein, the welding gun connecting piece can rotate relative to the trolley connecting piece to adjust the swing direction of the automatic welding gun.

2. The welding gun angle adjustment structure according to claim 1, characterized in that: The welding gun connecting piece includes a welding gun rotating section and a welding gun fixing section; The welding gun fixed section is height-adjustably connected relative to the welding gun rotating section, and the welding gun rotating section is rotatably connected to the trolley connecting piece.

3. The welding gun angle adjustment structure according to claim 1 or 2, characterized in that: The positioning member is a positioning bolt.

4. A pipeline automatic welding device, characterized in that: The invention comprises a welding track, a welding carriage, a welding gun angle adjustment structure as described in any one of claims 1 to 3, and an automatic welding gun.

5. A pipeline automatic welding method, applied to the pipeline automatic welding device as claimed in claim 4, characterized in that: include: Bevel the upper and lower pipe ends of the pipe to be welded to form a symmetrical single V-shaped bevel; Preheating the grooves of the upper pipe opening and the lower pipe opening, the preheating temperature is 100°C to 150°C, and the preheating width is not less than 75mm on both sides of the groove; Performing upward root welding on the upper pipe opening and the lower pipe opening by manual tungsten inert gas arc welding; The upper pipe opening and the lower pipe opening are heat welded by manual tungsten inert gas arc welding; Installing the pipeline automatic welding device on the pipeline to be welded, and adjusting the welding gun angle adjustment structure to make the automatic welding gun swing in the horizontal direction; The pipeline automatic welding device is used to perform flux-cored gas shielded automatic welding on the pipeline to be welded.

6. The pipeline automatic welding method according to claim 5, characterized in that: The angle of the single V-shaped groove is 23.5° to 24.5°.

7. The pipeline automatic welding method according to claim 5, characterized in that: The method further comprises: preheating the grooves of the upper pipe opening and the lower pipe opening at a preheating temperature of 100° C. to 150° C. and a preheating width of not less than 75 mm on both sides of the groove; The upper pipe opening and the lower pipe opening are assembled by using an external pipe assembly tool, and the assembly gap is 3mm to 4mm.

8. The pipeline automatic welding method according to claim 5, characterized in that: The automatic pipeline welding device is installed on the pipeline to be welded, and the welding gun angle adjustment structure is adjusted to make the automatic welding gun swing in the horizontal direction, including: Installing a welding track on the upper pipe opening, and installing a welding trolley on the welding track, wherein the welding trolley can move along the welding track; Measuring the inclination angle of the pipe to be welded; The welding gun angle adjustment structure is adjusted based on the tilt angle so that the automatic welding gun swings in a horizontal direction.

9. The pipeline automatic welding method according to any one of claims 5 to 8, characterized in that: The process parameters of the flux-cored wire gas shielded automatic welding are: flux-cored wire diameter 1.2mm, welding voltage 22V~24V, wire feeding speed 220in / min~270in / min, wire dry extension length 8mm~15mm, welding speed 17cm / min~23cm / min, dwell time on both sides of the groove 100ms~400ms, swing width 3.5mm~7.5mm, swing frequency 55 times / min~75 times / min, and mixed gas flow rate 30L / min~45L / min.

10. The pipeline automatic welding method according to any one of claims 5 to 8, characterized in that: The method of using the pipeline automatic welding device to perform flux-cored gas shielded automatic welding on the pipeline to be welded includes: If the flux-cored gas shielded automatic welding is a filling welding, and the width of the filling layer is greater than the preset width, welding is performed from the lower pipe opening to the upper pipe opening; If the flux-cored gas shielded automatic welding is a capping weld, and the width of the capping layer is greater than a preset width, welding is performed from the upper pipe opening to the lower pipe opening.

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