CN117697087A - Automatic welding process for mixed gas protection of large-caliber thick-wall 20mm steel pipe structural part consumable electrode - Google Patents
Automatic welding process for mixed gas protection of large-caliber thick-wall 20mm steel pipe structural part consumable electrode Download PDFInfo
- Publication number
- CN117697087A CN117697087A CN202311606900.6A CN202311606900A CN117697087A CN 117697087 A CN117697087 A CN 117697087A CN 202311606900 A CN202311606900 A CN 202311606900A CN 117697087 A CN117697087 A CN 117697087A
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- China
- Prior art keywords
- welding
- steel pipe
- wall
- pipe structural
- consumable electrode
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- Pending
Links
- 238000003466 welding Methods 0.000 title claims abstract description 138
- 238000000034 method Methods 0.000 title claims abstract description 28
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 24
- 239000010959 steel Substances 0.000 title claims abstract description 24
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 210000001503 joint Anatomy 0.000 claims abstract description 9
- 239000000155 melt Substances 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 24
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 2
- 239000001569 carbon dioxide Substances 0.000 claims description 2
- 230000003111 delayed effect Effects 0.000 claims 1
- 229910001092 metal group alloy Inorganic materials 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 abstract description 2
- 239000002184 metal Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000004429 Calibre Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention relates to a consumable electrode mixed gas shielded welding method, in particular to a consumable electrode mixed gas shielded automatic welding process for a 20mm thick-wall steel pipe structural part. A melt electrode mixed gas protection automatic welding process for a large-caliber thick-wall 20mm steel pipe structural member comprises the following steps: (1) Forming a V-shaped groove at the butt joint of the workpieces, and connecting the workpieces in a butt joint welding mode; (2) welding in a multi-layer and multi-pass welding mode; (3) using a melt electrode mixture to protect the automatic welding. The invention has the following advantages: 1. the welding of the large-caliber thick-wall steel pipe structural part can be realized, and the welding process is completed at one time; 2. the welding seam has good molding quality and attractive appearance; 3. reduces the labor intensity of workers and improves the production efficiency.
Description
Technical Field
The invention relates to a consumable electrode mixed gas shielded welding method, in particular to a consumable electrode mixed gas shielded automatic welding process for a 20mm thick-wall steel pipe structural part.
Background
At present, with the continuous development of the technology level, new structural members are adopted in the field of aviation, and in the manufacturing of these new structural members, welding technology is an important mode of structural member connection. In general, a large-caliber thick-wall steel pipe is used as a cabin body of a training bomb, which is important for the safety and the practicability of a thick-wall steel pipe structural member. However, the traditional thick-wall steel pipe structural parts are connected by adopting a manual arc welding mode, and the structural parts welded by the method have large deformation, so that the quality of welding seams cannot be ensured; in addition, manual arc welding is a manual operation, and has low welding speed, so that the construction efficiency is low.
Disclosure of Invention
The invention aims to provide an automatic gas metal arc welding process for a large-caliber thick-wall 20mm steel pipe structural member with high welding seam quality.
In order to achieve the above purpose, the present invention adopts the following technical scheme: a melt electrode mixed gas protection automatic welding process for a large-caliber thick-wall 20mm steel pipe structural member comprises the following steps:
(1) Forming a V-shaped groove at the butt joint of the workpieces, and connecting the workpieces in a butt joint welding mode;
(2) Welding in a multilayer and multi-pass welding mode;
(3) And adopting a melt electrode mixture to protect automatic welding.
Preferably, in the step (1), the weld gap is controlled to be 2-4 mm.
Preferably, in the step (1), the groove angle is controlled within a range of 50 ° to 65 °.
Preferably, in the step (2), the multi-layer multi-pass welding comprises backing welding and cover welding; the technological parameters during backing welding are as follows: the welding current is 250-280A, the welding voltage is 23-28V, the welding speed is 130-170 mm/min, the left/right swing amplitude of the welding gun is 0-3 mm, and the swing speed of the welding gun is 130-150 mm/s; the technological parameters during cover welding are as follows: the welding current is 280-320A, the welding voltage is 28-32V, the welding speed is 160-210 mm/min, the left/right swing amplitude of the welding gun is 15-20 mm, and the swing speed of the welding gun is 130-150 mm/s.
Preferably, in the step (2), the pre-welding torch feeds air in advance for 0.8s, and the post-welding torch feeds air in retard for 1.0s.
Preferably, in the step (2), in the welding process, the overlap angle between the arc-receiving point and the arc-starting point is 8-10 degrees.
Preferably, in the step (2), the welding gun is shifted by a certain distance in the reverse direction of the rotation direction of the part, and the welding gun shifting angle is 10-20 degrees.
Preferably, in the step (2), the welding temperature is more than or equal to 16 ℃ and the elongation of the welding wire is 7-10 mm during welding.
Preferably, in the step (3), the shielding gas is argon and carbon dioxide, and the flow ratio of the shielding gas is Ar: co2=3:1; the gas flow is 15-20L/min.
Compared with the prior art, the invention has the following advantages:
1. the welding of the large-caliber thick-wall steel pipe structural part can be realized, and the welding process is completed at one time;
2. the welding seam has good molding quality and attractive appearance;
3. reduces the labor intensity of workers and improves the production efficiency.
Drawings
FIG. 1 is a schematic view of a workpiece groove structure in an embodiment of the invention;
FIG. 2 is a schematic diagram of workpiece welding in an embodiment of the invention;
in fig. 2, 1, a welding gun; 2. and (5) welding wires.
Description of the embodiments
The invention is further described in detail below with reference to fig. 1-2:
a kind of heavy-calibre thick wall 20mm steel tube structural component melts the gas mixture to protect the automatic welding process, adopt the welding positioner as the automatic welding device, including the following steps:
(1) The workpieces are connected in a butt welding mode, as shown in fig. 1, a V-shaped groove is formed at the butt joint of the workpieces, wherein the gap between welding seams is controlled to be 2-4 mm, and the angle control range of the groove is 50-65 degrees;
(2) Before welding, cleaning pollutants such as greasy dirt, rust and the like on the surface of a workpiece to be welded and the surface of a groove at the butt joint position, and ensuring the cleaning of the butt joint position of the workpiece;
(3) Adjusting technological parameters, and welding in a multilayer and multi-pass welding mode, wherein during backing welding, welding current is 250-280A, welding voltage is 23-28V, welding speed is 130-170 mm/min, left/right swing amplitude of a welding gun is 0-3 mm, and swing speed of the welding gun is 130-150 mm/s; during cover welding, the welding current is 280-320A, the welding voltage is 28-32V, the welding speed is 160-210 mm/min, the left/right swing amplitude of a welding gun is 15-20 mm, the swing speed of the welding gun is 130-150 mm/s, the gas is supplied to a welding gun before welding in advance for 0.8s, the gas is supplied to a welding gun after welding for 1.0s, and the lap joint angle of a welding point and a starting point is 8-10 degrees;
(4) Before backing welding, the workpiece is subjected to spot welding, so that the stability of the workpiece is ensured, during welding, the welding gun 1 is offset by a certain distance from the rotating direction of the part, the offset angle of the welding gun is 10-20 degrees, and the workpiece rotates anticlockwise in the welding process, so that molten metal is effectively prevented from flowing, and the forming quality of a welding seam is protected;
(5) The method adopts the melt electrode mixture for protection automatic welding, and adopts a multi-layer and multi-pass welding method during welding, namely adopts a welding method of short-circuit transition backing welding and jet transition cover welding.
In order to prevent molten metal from flowing during welding, the welding gun is offset by a certain distance from the rotating direction of the part by the normal forming of the protection welding seam, and the workpiece rotates anticlockwise during welding, as shown in figure 2.
As a preferred embodiment of the present embodiment, the shielding gas during welding of the steel pipe structural member is Ar: CO 2=3:1 (flow ratio), gas flow is 15-20L/min, welding temperature is not less than 16 ℃, and elongation of welding wire 2 is 7-10 mm.
As a preferred implementation mode of the embodiment, the steel pipe structural part is welded by adopting an automatic wire feeding mode during welding, the welding wire mark is H08Mn2SiA, and the diameter of the welding wire is phi 1.2mm.
The above examples are only preferred embodiments of the present invention and do not limit the present invention. Any extension, modification, etc. made by those skilled in the art without departing from the principles of the present invention should be included in the scope of the present invention.
Claims (9)
1. The automatic welding process for the mixed gas protection of the large-caliber thick-wall 20mm steel pipe structural member is characterized by comprising the following steps of:
(1) Forming a V-shaped groove at the butt joint of the workpieces, and connecting the workpieces in a butt joint welding mode;
(2) Welding in a multilayer and multi-pass welding mode;
(3) And adopting a melt electrode mixture to protect automatic welding.
2. The automatic welding process for the consumable electrode mixture gas protection of the large-caliber thick-wall 20mm steel pipe structural part according to claim 1, wherein in the step (1), a weld joint gap is controlled to be 2-4 mm.
3. The automatic welding process for the consumable electrode mixture gas protection of the large-caliber thick-wall 20mm steel pipe structural part according to claim 1, wherein in the step (1), the bevel angle is controlled to be 50-65 degrees.
4. The automatic welding process for the consumable electrode mixture gas protection of the large-caliber thick-wall 20mm steel pipe structural part according to claim 1, wherein in the step (2), the multi-layer multi-pass welding comprises backing welding and face welding; the technological parameters during backing welding are as follows: the welding current is 250-280A, the welding voltage is 23-28V, the welding speed is 130-170 mm/min, the left/right swing amplitude of the welding gun is 0-3 mm, and the swing speed of the welding gun is 130-150 mm/s; the technological parameters during cover welding are as follows: the welding current is 280-320A, the welding voltage is 28-32V, the welding speed is 160-210 mm/min, the left/right swing amplitude of the welding gun is 15-20 mm, and the swing speed of the welding gun is 130-150 mm/s.
5. The automatic welding process for the consumable electrode mixture gas protection of the large-caliber thick-wall 20mm steel pipe structural part according to claim 1, wherein in the step (2), the pre-welding gun feeds air in advance for 0.8s, and the post-welding gun feeds air in a delayed manner for 1.0s.
6. The automatic welding process for the consumable electrode mixture gas protection of the large-caliber thick-wall 20mm steel pipe structural part according to claim 1, wherein in the step (2), the overlap angle between the arc-collecting point and the arc-starting point is 8-10 degrees in the welding process.
7. The automatic welding process for a consumable electrode mixture gas shielded metal alloy steel pipe structure with a large diameter and a thick wall according to claim 1, wherein in the step (2), the welding gun is shifted by a certain distance from the rotation direction of the part, and the welding gun shifting angle is 10-20 °.
8. The automatic welding process for the consumable electrode mixture gas protection of the large-caliber thick-wall 20mm steel pipe structural part, which is characterized in that in the step (2), the welding temperature is more than or equal to 16 ℃ and the welding wire elongation is 7-10 mm.
9. The automatic welding process for the consumable electrode mixture gas of the large-caliber thick-wall 20mm steel pipe structural part according to claim 1, wherein in the step (3), the shielding gas is argon and carbon dioxide, and the flow ratio is Ar: co2=3:1; the gas flow is 15-20L/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311606900.6A CN117697087A (en) | 2023-11-29 | 2023-11-29 | Automatic welding process for mixed gas protection of large-caliber thick-wall 20mm steel pipe structural part consumable electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311606900.6A CN117697087A (en) | 2023-11-29 | 2023-11-29 | Automatic welding process for mixed gas protection of large-caliber thick-wall 20mm steel pipe structural part consumable electrode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117697087A true CN117697087A (en) | 2024-03-15 |
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ID=90156105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311606900.6A Pending CN117697087A (en) | 2023-11-29 | 2023-11-29 | Automatic welding process for mixed gas protection of large-caliber thick-wall 20mm steel pipe structural part consumable electrode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117697087A (en) |
-
2023
- 2023-11-29 CN CN202311606900.6A patent/CN117697087A/en active Pending
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