CN109202225B - K-TIG-based double-sided double-arc welding system and method for small-diameter pipeline - Google Patents
K-TIG-based double-sided double-arc welding system and method for small-diameter pipeline Download PDFInfo
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- CN109202225B CN109202225B CN201811133782.0A CN201811133782A CN109202225B CN 109202225 B CN109202225 B CN 109202225B CN 201811133782 A CN201811133782 A CN 201811133782A CN 109202225 B CN109202225 B CN 109202225B
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- welding
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- 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
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
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- 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
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
- B23K9/0282—Seam welding; Backing means; Inserts for curved planar seams for welding tube sections
- B23K9/0286—Seam welding; Backing means; Inserts for curved planar seams for welding tube sections with an electrode moving around the fixed tube during the welding operation
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention belongs to the technical field of welding, and discloses a K-TIG (tungsten inert gas-tungsten inert gas) -based double-sided double-arc welding system and a K-TIG-based double-sided double-arc welding method for a small-bore pipeline, wherein a negative electrode of a welding machine power supply is connected with a K-TIG (tungsten inert gas-tungsten inert gas) welding gun, a positive electrode of the welding machine power supply is connected with a tungsten electrode ring, and the tungsten electrode ring is arranged in a welded pipeline through an insulating rod, so that the tungsten electrode ring and the K-TIG welding gun; when in welding, the tungsten polar ring is firstly contacted with a welded pipeline, and a welding power supply outputs welding current for arc striking; separating the tungsten polar ring from the inner wall of the welded pipeline and igniting electric arc; and (3) performing circular motion on the seam by the K-TIG welding gun along the welded pipeline, increasing the welding current, and completing the welding after surrounding for a circle. The invention combines the original K-TIG process with the double-sided double-arc piercing welding process, greatly reduces piercing current, and reduces the deformation degree of the workpiece through the double-sided arc welding process; the method has the advantages of low equipment operation cost, easy realization of process conditions, short welding preparation time and the like.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a welding system and a welding method based on K-TIG.
Background
The pipeline transportation is one of five transportation industries of railway, highway, marine transportation, civil aviation and long-distance pipeline, and plays an important role in national economic construction. Both urban and industrial developments require the laying of large numbers of pipelines. At present, the pipeline network must be built by welding, so that the guarantee of the welding quality of the pipe joint is particularly critical. At present, due to the reasons of flexibility of manual welding, low requirements on equipment and the like, the outdoor pipeline is mainly welded by hand, and the outdoor pipeline welding device has the characteristics of high efficiency and high adaptability to the environment.
K-TIG (lockhole high-efficient penetration argon arc welding torch) is a novel perforation welding process method which is based on the traditional TIG welding torch, generates cathode shrinkage effect through a water-cooling tungsten electrode and is matched with larger welding current. A large number of process tests prove that: the K-TIG welding process is suitable for welding metal materials with low heat conductivity, but because the average energy density of the adopted free arc is low, the stability of a small hole is deteriorated along with the increase of the heat conductivity of a workpiece, the stable forming of a welding seam is influenced, the defects of welding beading, inward recessing, incomplete penetration and the like can be generated, the deformation degree of the workpiece is large, and the welding quality of a thin-caliber pipeline is seriously influenced.
Disclosure of Invention
The invention aims to solve the technical problem that the stability of a small hole in K-TIG welding is worsened along with the increase of the heat conductivity of a workpiece, and provides a K-TIG-based double-sided double-arc welding system and a K-TIG-based double-sided double-arc welding method for a small-caliber pipeline, wherein the original K-TIG process is combined with a double-sided double-arc piercing welding process, so that the piercing current is greatly reduced, and the deformation degree of the workpiece is reduced through the double-sided arc welding process; the method has the advantages of low equipment operation cost, easy realization of process conditions, short welding preparation time and the like.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the double-sided double-arc welding system for the small-caliber pipeline based on the K-TIG comprises a welding machine power supply, wherein the negative electrode of the welding machine power supply is connected with the K-TIG welding gun, the positive electrode of the welding machine power supply is connected with a tungsten electrode ring, the tungsten electrode ring is fixed on an insulating rod, the insulating rod is arranged inside the welded pipeline, and the tungsten electrode ring and the K-TIG welding gun are oppositely arranged on two sides of a butt joint seam of the welded pipeline.
Further, the insulating rod is coaxial with the welded pipeline.
A K-TIG based double-sided double arc welding method of a small-diameter pipe, which is performed using a K-TIG based double-sided double arc welding system of claims 1-2, and which comprises the steps of:
(1) placing the insulating rod in the welded pipeline, and enabling the tungsten polar ring fixed on the insulating rod to be opposite to the K-TIG welding gun to be respectively arranged on two sides of a butt joint seam of the welded pipeline;
(2) moving the insulating rod to enable the tungsten polar ring to be in contact with a welded pipeline, outputting an arc starting current by the welding machine power supply, igniting an electric arc between the K-TIG welding gun and the welded pipeline, and forming a current loop;
(3) moving the insulating rod to separate the tungsten polar ring from the inner wall of the welded pipeline, igniting an electric arc between the tungsten polar ring and the welded pipeline, completing an arc striking process, and burning a double-sided electric arc between the tungsten polar ring and the K-TIG welding gun;
(4) and outputting the power supply of the welding machine according to the welding current, and enabling the K-TIG welding gun to do circular motion along the butt joint of the welded pipeline at the welding speed, and completing the welding of the welded pipeline after the K-TIG welding gun circles for a circle.
The invention has the beneficial effects that:
the invention relates to a K-TIG-based double-sided double-arc welding system and a K-TIG-based double-sided double-arc piercing welding method for a small-diameter pipeline, wherein a welding arc is burnt between an external K-TIG welding gun and a tungsten electrode ring in the pipeline, welding current completely passes through a welding seam and generates a magnetic field, so that the Lorentz force of charged particles in an arc column is obviously increased, the electromagnetic shrinkage effect on the arc is enhanced, the energy is more concentrated, the arc force is enhanced, and compared with a single welding gun and single arc welding process, the welding current is greatly reduced, the welding heat input is reduced, and the welding stress and deformation are reduced.
Drawings
FIG. 1 is a schematic structural diagram (along the radial direction of a pipeline) of a K-TIG-based double-sided double-arc welding system for a small-diameter pipeline in an embodiment provided by the invention;
FIG. 2 is a schematic structural diagram (along the axial direction of the pipeline) of a K-TIG-based double-sided double-arc welding system for a small-diameter pipeline in an embodiment of the invention;
in the figure: 1. a welder power supply; a K-TIG welding gun; 3. welded pipelines; 4. an insulating rod; 5. a tungsten polar ring.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
as shown in figures 1 and 2, one embodiment of the invention discloses a double-sided double-arc welding system for a small-caliber pipeline based on K-TIG, which mainly comprises a welding machine power supply 1, a K-TIG welding gun 2, an insulating rod 4 and a tungsten electrode ring 5, wherein the welding machine power supply is suitable for the small-caliber pipeline to be welded 3, and the nominal diameter of the pipeline to be welded 3 is generally not more than 200 mm.
The negative pole of the welding machine power supply 1 is connected with the K-TIG welding gun 2, and the positive pole of the welding machine power supply 1 is connected with the tungsten electrode ring 5. The tungsten electrode ring 5 is fixed on the insulating rod 4, the insulating rod 4 is coaxially arranged inside the welded pipeline 3, so that the tungsten electrode ring 5 and the K-TIG welding gun 2 are oppositely arranged on two sides of a butt joint of the welded pipeline 3, namely the central axis of the K-TIG welding gun 2 penetrates through the butt joint to intersect with the tungsten electrode ring 5 inside the welded pipeline 3.
The invention also discloses a welding method of the K-TIG-based double-sided double-arc welding system for the small-diameter pipeline, which comprises the following steps:
(1) measuring the distance between the butt joint of the welded pipeline 3 and the pipe orifice, placing an insulating rod 4 in the welded pipeline 3 and coaxially arranging the insulating rod 4 and the welded pipeline 3, wherein the insulating rod 4 extends into the welded pipeline 3 by a corresponding length, so that a tungsten polar ring 5 fixed on the insulating rod 4 and a K-TIG welding gun 2 are oppositely arranged at two sides of the butt joint of the welded pipeline 3, namely the central axis of the K-TIG welding gun 2 penetrates through the butt joint and is intersected with the tungsten polar ring 5 in the welded pipeline 3;
(2) in the arc starting process, the tungsten polar ring 5 is contacted with the inner wall of the welded pipeline 3 by moving the insulating rod 4, the welding machine power supply 1 outputs a small arc starting current (generally 10A-30A), an electric arc is ignited between the K-TIG welding gun 2 and the welded pipeline 3, and a current loop of the negative electrode of the welding machine power supply 1, the K-TIG welding gun 2, the welded pipeline 3, the tungsten polar ring 5 and the positive electrode of the welding machine power supply 1 is formed;
(3) moving the insulating rod 4 to enable the insulating rod 4 to be coaxial with the welded pipeline 3, so that the tungsten electrode ring 5 is separated from the inner wall of the welded pipeline 3, directly igniting electric arcs between the tungsten electrode ring 5 and the inner wall of the welded pipeline 3 to finish the arc striking process, and burning double-sided electric arcs between the tungsten electrode ring 5 and the K-TIG welding gun 2;
(4) after the double-sided arc is successfully ignited, the K-TIG welding gun 2 makes circular motion along the welded pipeline 3 at the welding speed corresponding to the working condition, meanwhile, the welding current output by the welding machine power supply 1 is increased to the welding current corresponding to the working condition, and after the welding current is circulated for a circle, the welding of the welded pipeline 3 is completed. The welding speed and the welding current depend on the material and thickness of the weldment, and are not limited herein.
The invention relates to a K-TIG-based double-sided double-arc welding system and a K-TIG-based double-sided double-arc welding method for a small-caliber pipeline, wherein a K-TIG welding gun 2 and a tungsten electrode ring 5 are oppositely arranged on two sides of a butt joint of a pipeline 3 to be welded and are respectively and directly connected with two electrodes of a same welding machine power supply 1, so that welding current can completely pass through a molten pool without dispersion, and homodromous current in the molten pool generates a magnetic field, so that the Lorentz force of charged particles in an arc column is remarkably increased, and the electromagnetic shrinkage effect on electric arcs is enhanced. In the welding process, the K-TIG welding gun 2 rotates around the welded pipeline 3 for a circle, and then the welding can be finished.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make various changes and modifications within the spirit and scope of the present invention without departing from the spirit and scope of the appended claims.
Claims (3)
1. The double-sided double-arc welding system based on the K-TIG (K-tungsten inert gas) for the small-bore pipeline comprises a welding machine power supply and is characterized in that a negative electrode of the welding machine power supply is connected with a K-TIG (tungsten inert gas) welding gun, a positive electrode of the welding machine power supply is connected with a tungsten electrode ring, the tungsten electrode ring is fixed on an insulating rod, the insulating rod is arranged inside the welded pipeline, and the tungsten electrode ring and the K-TIG welding gun are oppositely arranged on two sides of a butt joint of the welded pipeline.
2. A K-TIG based double-sided dual arc welding system of small diameter pipes according to claim 1, where the insulating rod is coaxial with the pipe being welded.
3. A K-TIG based double-sided double arc welding method for a small diameter pipe, which is performed using a K-TIG based double-sided double arc welding system for a small diameter pipe according to claims 1-2, and which comprises the steps of:
(1) placing the insulating rod in the welded pipeline, and enabling the tungsten polar ring fixed on the insulating rod to be opposite to the K-TIG welding gun to be respectively arranged on two sides of a butt joint seam of the welded pipeline;
(2) moving the insulating rod to enable the tungsten polar ring to be in contact with a welded pipeline, outputting an arc starting current by the welding machine power supply, igniting an electric arc between the K-TIG welding gun and the welded pipeline, and forming a current loop;
(3) moving the insulating rod to separate the tungsten polar ring from the inner wall of the welded pipeline, igniting an electric arc between the tungsten polar ring and the welded pipeline, completing an arc striking process, and burning a double-sided electric arc between the tungsten polar ring and the K-TIG welding gun;
(4) and outputting the power supply of the welding machine according to the welding current, and enabling the K-TIG welding gun to do circular motion along the butt joint of the welded pipeline at the welding speed, and completing the welding of the welded pipeline after the K-TIG welding gun circles for a circle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811133782.0A CN109202225B (en) | 2018-09-27 | 2018-09-27 | K-TIG-based double-sided double-arc welding system and method for small-diameter pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811133782.0A CN109202225B (en) | 2018-09-27 | 2018-09-27 | K-TIG-based double-sided double-arc welding system and method for small-diameter pipeline |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109202225A CN109202225A (en) | 2019-01-15 |
| CN109202225B true CN109202225B (en) | 2021-02-26 |
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| CN201811133782.0A Expired - Fee Related CN109202225B (en) | 2018-09-27 | 2018-09-27 | K-TIG-based double-sided double-arc welding system and method for small-diameter pipeline |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03180273A (en) * | 1989-12-07 | 1991-08-06 | Hitachi Seiko Ltd | Fixed pipe automatic welding equipment |
| JPH06328256A (en) * | 1993-05-20 | 1994-11-29 | Tadahiro Omi | Welding head and welding equipment |
| WO2014057311A1 (en) * | 2012-10-11 | 2014-04-17 | Gea Aircooled Systems Proprietary Limited | A method and device for butt welding tubes |
| CN103600177B (en) * | 2013-11-25 | 2016-06-22 | 北京工业大学 | A kind of single supply VPPA-GTAW bifurcation piercing by electric arc welding method |
| CN104785905B (en) * | 2015-04-01 | 2017-03-22 | 浙江工业大学 | Welding device for preventing welding hot cracking and deformation |
| CN106378518A (en) * | 2016-11-30 | 2017-02-08 | 东方电气集团东方锅炉股份有限公司 | TIG welding method used for large-diameter thin-wall stainless steel cylinder workpiece circular seam |
| CN207563891U (en) * | 2017-12-14 | 2018-07-03 | 天津轻工职业技术学院 | A kind of large current load K-TIG welding guns |
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- 2018-09-27 CN CN201811133782.0A patent/CN109202225B/en not_active Expired - Fee Related
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