CN109332858B - Welding method for hollow tungsten ultra-high deep-melting TIG filler wire welding thick plate - Google Patents
Welding method for hollow tungsten ultra-high deep-melting TIG filler wire welding thick plate Download PDFInfo
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- CN109332858B CN109332858B CN201811430873.0A CN201811430873A CN109332858B CN 109332858 B CN109332858 B CN 109332858B CN 201811430873 A CN201811430873 A CN 201811430873A CN 109332858 B CN109332858 B CN 109332858B
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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
- B23K9/235—Preliminary treatment
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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
- B23K9/24—Features related to electrodes
- B23K9/28—Supporting devices for electrodes
- B23K9/285—Cooled electrode holders
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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
- B23K9/32—Accessories
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Abstract
The invention relates to a welding method of a hollow tungsten ultra-high deep melting TIG filler wire welding thick plate, which comprises the following steps: the method comprises the following steps: fixing a workpiece to be welded on a welding tool fixture; step two: starting a welding machine, and setting welding parameters: the welding current is 300-1000A, the arc starting current is 350-1100A, the cut-off current is 200-300A, the arc starting time is 0.4-0.6s, the transition time is 0.5-0.8s, the reduction time is 2-3s, the ion gas flow is 4-6L/min, the protective gas flow is 15-20L/min, the advanced gas supply time is 3-5s, argon is introduced into the inner hole of the hollow tungsten electrode, the gas flow is 3-5L/min, the gas flow is 18-20L/min, the delay time of the gas after welding is 15-40s, the workpiece gap is 0.2-0.5mm, and the welding speed is 200-500 mm/min; the included angle between the wire feeding nozzle and the tungsten electrode is 15-30 degrees, and the wire feeding speed is 100-350 mm/min; step three: the thick plate welding is started through a welding preparation button and a welding starting button on the welding machine. The invention realizes one-time welding through of the thick plate, and ensures the formation of high-quality welding seams while realizing high-speed welding of the thick plate.
Description
Technical Field
The invention relates to a welding method, in particular to a welding method for welding a thick plate by hollow tungsten ultra-high deep melting TIG filler wire.
Background
The argon tungsten-arc welding process is stable and has good welding quality, and the method is widely applied to actual welding production, but has obvious defects: the welding depth of the single welding line is shallow, the deposition rate is low, and the method is not suitable for thick plate welding. A high-depth fusion lockhole STIG welding system (SWS-1000) is developed by Shanghai Mukuai industry Co., Ltd, the effect of plasma arc is achieved through efficient electromagnetic compression on the arc, the energy of the arc is concentrated during welding, the balance between the pressure of the arc and the surface tension of liquid metal in a molten pool is achieved during welding, a stable small hole effect is formed, the high-depth fusion lockhole STIG welding system has super-strong penetrating power, and a steel plate with the diameter being less than 12mm can be welded through at one time.
Because the welding current is larger, the welding fusion width is also larger, which requires that the wire feeding speed is increased when the wire is fed, but because the external wire feeding can cause the stay time of the welding wire in the electric arc to be short, when the wire feeding speed is increased, the welding defects that the welding wire is not melted and enters a molten pool to form inclusion and the like are easy to occur.
Disclosure of Invention
In order to solve the problems, the invention provides a method for welding a thick plate by using a hollow tungsten electrode and a high-deep-melting TIG filler wire, which changes an originally thick solid tungsten electrode into a hollow tungsten electrode, further compresses a welding arc under the condition of the same welding condition because argon is introduced into the hollow tungsten electrode, concentrates the energy of the arc, and simultaneously changes a welding wire into a wire feeding from the inside of a welding gun, thereby ensuring that the welding wire can be quickly melted and enter a molten pool while ensuring that the welding gun can quickly penetrate through a thick plate workpiece to be welded, and forming a good welding seam.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the invention relates to a welding method of a hollow tungsten ultra-high deep melting TIG filler wire welding thick plate, which is characterized by comprising the following steps of: the welding method comprises the following steps:
the method comprises the following steps: before welding, polishing or cleaning the surface of a workpiece to be welded, fixing the polished or cleaned workpiece to be welded on a welding tool fixture, wherein the thickness of the workpiece is 5-14mm, and the distance between the bottom end of a tungsten electrode and the workpiece is 2-3 mm;
step two: starting a welding machine, and setting welding parameters: the welding mode is continuous welding or pulse welding, the welding current is 300-1000A, the arc starting current is 350-1100A, the cut-off current is 200-300A, the arc starting time is 0.4-0.6s, the transition time is 0.5-0.8s, the drop time is 2-3s, argon or mixed gas is adopted as the welding gun protective gas and the ionic gas, the ionic gas flow is 4-6L/min, the protective gas flow is 15-20L/min, the advance gas supply time is 3-5s, argon is introduced into the inner hole of the hollow tungsten electrode, the gas flow is 3-5L/min, the upper protective gas and the lower protective gas of the welding seam are argon, the gas flow is 18-20L/min, the welding completion gas delay is 15-40s, the workpiece gap is 0.2-0.5mm, and the welding speed is 200-500 mm/min; the included angle between the wire feeding nozzle and the tungsten electrode is 15-30 degrees, and the wire feeding speed is 100-350 mm/min;
step three: the thick plate welding is started through a welding preparation button and a welding starting button on the welding machine.
The invention has the beneficial effects that: the invention (1) changes the common solid tungsten electrode into the hollow tungsten electrode, the protective gas is input from the inner cavity of the hollow tungsten electrode, the protective gas passes through the inner cavity wall of the tungsten electrode with water cooling after ionization, the electric arc is contracted by the cold wall, thereby obtaining the plasma electric arc with high electric arc energy density; (2) the plasma arc effect is achieved through efficient electromagnetic compression on the arc, the energy of the arc is concentrated during welding, the arc pressure and the surface tension of molten pool liquid metal are balanced during welding, a stable small hole effect is formed, the plasma arc welding device has super-strong penetration capacity, and a steel plate with the diameter less than 12mm can be welded through at one time; (3) the welding wire is changed from external wire feeding into internal wire feeding of the welding gun, the welding wire is melted more quickly and enters a molten pool, and the molten pool is stirred under the combined action of electric arc and gas in an inner hole of a hollow tungsten electrode, so that the weld penetration of a welding seam is increased, the penetration of a workpiece is quickly realized, and the welding efficiency and the welding quality are improved; (4) the invention can realize full-automatic operation, is simple and easy to operate in actual welding production, realizes the double-sided forming of single-sided welding, improves the welding efficiency and ensures the high quality of welding seams.
The invention realizes one-time welding through of the thick plate, and ensures the formation of high-quality welding seams while realizing high-speed welding of the thick plate.
Drawings
FIG. 1 is a schematic view of the welding of the present invention.
FIG. 2 is a schematic view of the structure of the tungsten electrode of the present invention.
FIG. 3 is a top view of the tungsten electrode of the present invention.
Detailed Description
For the purpose of enhancing the understanding of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.
As shown in figures 1-3, the invention is a welding method for welding a thick plate by a hollow tungsten ultra-high deep melting TIG filler wire, which is characterized in that: the welding method comprises the following steps:
the method comprises the following steps: before welding, polishing or cleaning the surface of a workpiece to be welded, fixing the polished or cleaned workpiece to be welded on a welding tool fixture, wherein the thickness of the workpiece is 5-14mm, and the distance between the bottom end of a tungsten electrode and the workpiece is 2-3 mm;
step two: starting a welding machine, and setting welding parameters: the welding mode is continuous welding or pulse welding, the welding current is 300-1000A, the arc starting current is 350-1100A, which is slightly higher than the welding current, the cut-off current is 200-300A, the arc starting time is 0.4-0.6s, the transition time is 0.5-0.8s, the descending time is 2-3s, argon or mixed gas is adopted as the welding gun protective gas and the ionic gas, the ionic gas flow is 4-6L/min, the protective gas flow is 15-20L/min, the advance gas supply time is 3-5s, argon is introduced into the inner hole of the hollow tungsten electrode, the gas flow is 3-5L/min, the upper protective gas and the lower protective gas of the welding seam are both argon, the gas flow is 18-20L/min, the welding completion gas delay is 15-40s, the workpiece gap is 0.2-0.5mm, and the welding speed is 200-500 mm/min; the included angle between the wire feeding nozzle and the tungsten electrode is 15-30 degrees, and the wire feeding speed is 100-350 mm/min;
step three: the thick plate welding is started through a welding preparation button and a welding starting button on the welding machine.
The welding method adopts a welding gun, a hollow tungsten electrode is used as an electrode in the welding gun, the top end of the welding gun is provided with a tungsten electrode inner hole air inlet 1, the lower end of the tungsten electrode is provided with a tungsten electrode inner hole gas outlet 7, a cooling water outlet 2 and a cooling water inlet 3 are also arranged in the welding gun, a shielding gas 4 is introduced between the tungsten electrode and the outer wall 9 of the welding gun, the welding gun is arranged above a workpiece 10, the shielding gas, namely argon gas, is introduced at the top end of the welding gun, the gas enters an electric arc 8 through the welding gun and the tungsten electrode, a welding wire 6 is fed through a wire feeding nozzle 5, the size of the hollow tungsten electrode is 5mm in outer diameter, the diameter of an inner hole is 3mm, the end part of the tungsten electrode is processed into a ring of about 0.2mm, and the angle is 20 degrees, so that the stability of arc striking is ensured, the tungsten electrode is not easy to burn, a larger welding current can be used, the high-speed welding is realized, the welding heat input is increased, the welding deposition efficiency and the welding speed is increased, the welding gun is changed to feed wires inside, so that the welding wire speed is increased to ensure that the welding wire melts and can be paved on the whole weld pool, the condition that the welding wire cannot be completely melted and enters the weld pool is avoided, and the formation of high-quality welding seams is better ensured.
The invention provides a more efficient method for welding a thick plate by a hollow tungsten electrode TIG filler wire, wherein the hollow tungsten electrode TIG welding can combine the advantages of two welding methods, the tungsten electrode of the hollow tungsten electrode is also thicker, but because of the existence of an inner hole of the tungsten electrode, intermediate gas has a certain cooling effect on the tungsten electrode, the burning loss speed of the tungsten electrode in the welding process is slowed down, because the straightness of a welding arc is higher, and a wire feeding mode in a welding gun is adopted, cladding metal can more quickly enter a welding molten pool, the molten pool is stirred under the action of introducing argon into the inner hole of the hollow tungsten electrode, the whole welding seam is filled more quickly, the welding seam penetration in the welding process is improved, and the plate thickness which can be welded by the TIG welding can be further increased.
Claims (1)
1. A welding method for welding a thick plate by using a hollow tungsten ultra-high deep-melting TIG filler wire is characterized by comprising the following steps of: the welding method comprises the following steps:
the method comprises the following steps: before welding, polishing or cleaning the surface of a workpiece to be welded, fixing the polished or cleaned workpiece to be welded on a welding tool fixture, wherein the thickness of the workpiece is 5-14mm, and the distance between the bottom end of a tungsten electrode and the workpiece is 2-3 mm;
step two: starting a welding machine, and setting welding parameters: the welding mode is continuous welding or pulse welding, the welding current is 1000A, the arc starting current is 350 1100A, the cut-off current is 200A, the arc starting time is 0.4-0.6s, the transition time is 0.5-0.8s, the reduction time is 2-3s, argon or mixed gas is adopted as the welding gun protective gas and the ionic gas, the ionic gas flow is 4-6L/min, the protective gas flow is 15-20L/min, the advance gas supply time is 3-5s, argon is introduced into the inner hole of the hollow tungsten electrode, the gas flow is 3-5L/min, the upper protective gas and the lower protective gas of the welding seam are argon, the gas flow is 18-20L/min, the welding completion gas delay is 15-40s, the workpiece gap is 0.2-0.5mm, and the welding speed is 200A and 500 mm/min; the included angle between the wire feeding nozzle and the tungsten electrode is 15-30 degrees, and the wire feeding speed is 100-350 mm/min;
step three: starting to weld the thick plate through a welding preparation button and a welding starting button on the welding machine;
the welding method adopts a welding gun, in the welding gun, a hollow tungsten electrode is used as an electrode, the top end of the welding gun is provided with a tungsten electrode inner hole air inlet (1), the lower end of the tungsten electrode is provided with a tungsten electrode inner hole gas outlet (7), a cooling water outlet (2) and a cooling water inlet (3) are arranged in the welding gun, a shielding gas (4) is introduced between the tungsten electrode and the outer wall (9) of the welding gun, the welding gun is arranged above a workpiece (10), the shielding gas is introduced at the top end of the welding gun and is argon, the gas enters an electric arc (8) through the welding gun and the tungsten electrode, a welding wire (6) is fed through a wire feeding nozzle (5), the size of the hollow tungsten electrode is 5mm in outer diameter, the inner hole diameter is 3mm, the end part of the tungsten electrode is processed into a ring with the wall thickness of 0.2mm, and the angle is 20 degrees.
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| CN111558764A (en) * | 2020-05-22 | 2020-08-21 | 株洲天一自动焊接装备有限公司 | Turbine shell rocker arm welding method |
| CN117324733B (en) * | 2023-10-26 | 2024-05-24 | 广东福维德焊接股份有限公司 | Deep fusion welding gun structure |
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