CN109483021B - Double-tungsten-electrode pulse TIG welding method - Google Patents
Double-tungsten-electrode pulse TIG welding method Download PDFInfo
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- CN109483021B CN109483021B CN201811388761.3A CN201811388761A CN109483021B CN 109483021 B CN109483021 B CN 109483021B CN 201811388761 A CN201811388761 A CN 201811388761A CN 109483021 B CN109483021 B CN 109483021B
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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
- B23K9/1675—Arc welding or cutting making use of shielding gas and of a non-consumable electrode making use of several electrodes
Abstract
The invention discloses a double-tungsten-electrode pulse TIG welding method, which is provided with a first welding gun and a second welding gun, and comprises the following steps: s1, adjusting the first welding gun and the second welding gun according to the set first distance, and adjusting the positions of the first welding gun and the second welding gun and the workpiece to be welded according to the set second distance; s2, switching on welding power supplies of the first welding gun and the second welding gun, and simultaneously inputting protective gas into the first welding gun and the second welding gun; s3, controlling the flow rate of protective gas input into a first welding gun and a second welding gun according to a preset speed, wherein an electric arc generated by the first welding gun and an electric arc generated by the second welding gun are coupled on the surface of a workpiece to be welded and are welded; meanwhile, the first welding gun and the second welding gun are vertically arranged, so that the effect is optimal after the electric arcs of the first welding gun and the second welding gun are coupled; the invention can improve the maximum allowable current of the double-tungsten TIG welding, effectively reduce the burning loss of the tungsten electrode, control the input of heat in the welding process and ensure that workpieces obtain uniform welding seam thickness.
Description
Technical Field
The invention belongs to the technical field of Tungsten Inert Gas Welding (TIG), and particularly relates to a double-Tungsten-electrode pulse TIG Welding method.
Background
The argon tungsten-arc welding process is stable, and the welding quality is good. However, this method has significant drawbacks: 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. The method improves the welding efficiency of TIG welding, keeps the advantages of good forming and high welding quality of TIG welding seams, is always a research target of welding workers, and presents a plurality of high-efficiency welding methods based on TIG welding.
The double tungsten electrode argon arc welding is an efficient welding method, has the advantages of high deposition speed, strong groove adaptability, good weld surface formation and the like, can obviously reduce the arc pressure by the double tungsten electrode TIG welding, and further promotes the development of the tungsten electrode argon arc welding technology. Two tungsten electrodes which are close to each other and independent are arranged in the double-tungsten-electrode argon arc welding gun, power is supplied independently, and the current is adjusted independently. The tungsten electrode spacing is used as an adjustable welding parameter, and the adjustment range is between 2 and 6 mm. However, the double tungsten electrode welding gun needs special design and has certain manufacturing cost. And the distance between the two tungsten electrodes is relatively close, so that the requirement on insulation is high.
Two common tungsten electrodes are used, two welding power supplies supply power, and the two tungsten electrodes are coupled together in an electric arc mode under the condition of a certain angle and a certain tungsten electrode distance. At this time, the temperature of the coupled arc is increased, the arc area is compressed, and the energy of the arc is more concentrated in the arc column area. At the moment, the deposition speed is high, and the weld joint is formed well. However, the maximum welding current that can be used during welding is small due to the limited current carrying capacity of the tungsten electrode. Meanwhile, when the two tungsten electrodes are coupled together, the temperature of the electric arc is improved to a certain degree, the tungsten electrodes are easily burnt, the welding heat input is small, and the welding efficiency of the double-tungsten electrode argon arc welding is influenced.
Disclosure of Invention
The invention mainly aims to provide a double-tungsten-electrode pulse TIG welding method, which can control heat input required by welding in the welding process in real time and is used for solving the problems of easy burning loss and low welding efficiency of a tungsten electrode in the prior art, and the specific technical scheme is as follows:
a double tungsten electrode pulse TIG welding method that is set with two welding guns, a first welding gun and a second welding gun, comprising the steps of:
s1, adjusting the first welding gun and the second welding gun according to the set first distance, and adjusting the positions of the first welding gun and the second welding gun and the workpiece to be welded according to the set second distance;
s2, switching on welding power supplies of the first welding gun and the second welding gun, and simultaneously inputting protective gas into the first welding gun and the second welding gun;
and S3, controlling the flow rate of the protective gas input into the first welding gun and the second welding gun according to a preset speed, wherein the first welding gun generates an electric arc, the second welding gun generates an electric arc, and the electric arc is coupled and welded on the surface of a workpiece to be welded.
A further improvement of the present invention is that step S1 further includes the steps of: and adjusting the vertical arrangement of the first welding gun and the second welding gun.
In a further development of the invention, the welding power supply of the first welding torch and the second welding torch is pulsed current.
A further improvement of the present invention is that step S3 further includes the steps of: adjusting a peak current, a base current, a pulse frequency, and a duty cycle of the welding power source.
The invention is further improved in that the distance between the tip of the tungsten electrode arranged in the first welding gun and the tip of the tungsten electrode arranged in the second welding gun is 8-12mm, and the distance between the tungsten electrode arranged in the first welding gun and the workpiece to be welded arranged in the second welding gun is 3-5 mm.
The invention has the further improvement that the input speeds of the protective gas of the first welding gun and the second welding gun are consistent and are both 12-18L/min; and the protective gas is an inert protective gas.
The invention relates to a double-tungsten-electrode pulse TIG welding method, which is characterized in that a workpiece to be welded is welded by setting a first welding gun and a second welding gun, the first welding gun and the second welding gun are perpendicular, the horizontal distance between the tips of tungsten electrodes in the first welding gun and the second welding gun is 8mm, the vertical distance between the tips of the tungsten electrodes in the lead-containing welding gun and the surface of the workpiece to be welded is 4mm, and inert protective gas is filled in the welding process; during welding, pulse current is input into one of the first welding gun and the second welding gun, non-pulse current is input into the other welding gun, electric arcs generated by tungsten electrodes of the first welding gun and the second welding gun are coupled on the surface of a workpiece, and then welding operation is carried out on the workpiece to be welded; meanwhile, in the welding process, the peak current, the base current, the pulse frequency, the duty ratio and the like in the welding process can be properly adjusted according to actual conditions so as to improve the quality of the welding seam; compared with the prior art, the invention controls the first welding gun and the second welding gun to generate electric arcs for welding through the pulse current, and can control the heat input of the two welding guns by controlling the parameters of the pulse current such as the basic current, the peak current, the current pulse frequency, the duty ratio and the like, thereby achieving the purposes of controlling the electric arc temperature, avoiding the occurrence of burning loss of the tungsten electrode and improving the welding efficiency and quality.
Drawings
FIG. 1 is a schematic diagram of a double tungsten-electrode pulse TIG welding method in an embodiment of the invention;
fig. 2 to 5 are schematic diagrams of arc configurations of the double tungsten pulse coupling according to the embodiment of the present invention.
And (3) identification and explanation: 1-workpiece, 2-welding power supply, 3-first welding gun, 4-second welding gun and 5-coupled arc.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Referring to fig. 1 to 5, in an embodiment of the present invention, a double tungsten-electrode pulse TIG welding method is provided, where two welding guns are set, the method specifically includes the following steps:
s1, adjusting the first welding gun 3 and the second welding gun 4 according to the set first distance, and adjusting the positions of the first welding gun 3 and the second welding gun 4 and the workpiece 1 to be welded according to the set second distance;
in the embodiment of the invention, in order to enable the electric arc generated when the first welding gun 3 and the second welding gun 4 are welded to have good welding effect, the first welding gun 3 and the second welding gun 4 are vertically arranged, meanwhile, the horizontal distance between the tip of the tungsten electrode arranged in the first welding gun 3 and the tip of the tungsten electrode arranged in the second welding gun 4 is set, and the vertical distance between the tungsten electrode arranged in the first welding gun 3 and the tungsten electrode arranged in the second welding gun 4 and the workpiece 1 to be welded is set; preferably, the horizontal distance between the tip of the tungsten electrode in the first welding gun 3 and the tip of the tungsten electrode in the second welding gun 4 is set to be 8mm, and the vertical distance between the tungsten electrodes in the two welding guns and the workpiece 1 to be welded is set to be 4 mm.
S2, switching on the welding power supply 2 of the first welding gun 3 and the second welding gun 4, and simultaneously inputting protective gas into the first welding gun 3 and the second welding gun 4; and S3, controlling the flow rate of the protective gas input into a first welding gun and a second welding gun according to the preset speed, wherein the first welding gun generates an electric arc which is coupled with the second welding gun to weld on the surface of the workpiece to be welded.
Specifically, in the embodiment, if the welding power supply 2 of the first welding torch 3 is a pulse current, the welding power supply 2 of the second welding torch 4 is a non-pulse current; on the other hand, if the welding power source 2 of the first welding torch 3 is a non-pulse current, the welding power source 2 of the second welding torch 4 is a pulse current.
In order to improve the stability of the welding process and ensure the quality after welding, inert shielding gas such as argon gas and the like is required to be input into the first welding gun 3 and the second welding gun 4, and the input speed of the shielding gas of the first welding gun 3 and the second welding gun 4 is ensured to be consistent; preferably, this embodiment uses argon as the shielding gas at a rate of 18L/min.
In the invention, during welding, the electric arc generated by the tungsten electrode in the first welding gun 3 is coupled with the electric arc generated by the tungsten electrode in the second welding gun 4 to generate a coupling electric arc 5 for welding operation; specifically, since the welding power supply 2 generates the pulse current in the present invention, the heat input during the welding process can be controlled by adjusting the peak current, the base current, the pulse frequency and the duty ratio of the welding power supply 2 in the present invention, so as to adapt to the welding operations with different requirements; moreover, because the heat input is controllable, the situation that the tungsten electrode is burnt due to high temperature can be effectively avoided, and meanwhile, the welding quality and the welding efficiency are improved.
The invention relates to a double-tungsten-electrode pulse TIG welding method, which is characterized in that a workpiece to be welded is welded by setting a first welding gun and a second welding gun, the first welding gun and the second welding gun are perpendicular, the horizontal distance between the tips of tungsten electrodes in the first welding gun and the second welding gun is 8mm, the vertical distance between the tips of the tungsten electrodes in the lead-containing welding gun and the surface of the workpiece to be welded is 4mm, and inert protective gas is filled in the welding process; during welding, pulse current is input into the first welding gun and the second welding gun, electric arcs generated by tungsten electrodes of the first welding gun and the second welding gun are coupled on the surface of a workpiece, and then welding operation is carried out on the workpiece to be welded; meanwhile, in the welding process, the peak current, the base current, the pulse frequency, the duty ratio and the like in the welding process can be properly adjusted according to actual conditions so as to improve the quality of the welding seam; compared with the prior art, the invention controls the first welding gun and the second welding gun to generate electric arcs for welding through the pulse current, and can control the heat input of the two welding guns by controlling the parameters of the pulse current such as the basic current, the peak current, the current pulse frequency, the duty ratio and the like, thereby achieving the purposes of controlling the electric arc temperature, avoiding the occurrence of burning loss of the tungsten electrode and improving the welding efficiency and quality.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing detailed description, or equivalent arrangements may be substituted for those skilled in the art. All equivalent structures made by using the contents of the specification and the attached drawings of the invention can be directly or indirectly applied to other related technical fields, and are also within the protection scope of the patent of the invention.
Claims (1)
1. A double tungsten electrode pulse TIG welding method in which two welding torches, a first welding torch and a second welding torch, are set, the method comprising the steps of:
s1, adjusting the first welding gun and the second welding gun according to the set first distance, and adjusting the positions of the first welding gun and the second welding gun and the workpiece to be welded according to the set second distance; vertically arranging a first welding gun and a second welding gun; setting the horizontal distance between the tip of a tungsten electrode in a first welding gun and the tip of a tungsten electrode in a second welding gun to be 8mm, and setting the vertical distance between the tungsten electrodes in the two welding guns and a workpiece to be welded to be 4 mm;
s2, switching on welding power supplies of the first welding gun and the second welding gun, and simultaneously inputting protective gas into the first welding gun and the second welding gun; the welding power supply of the first welding gun is pulse current, and the welding power supply of the second welding gun is non-pulse current; the welding power supply of the first welding gun generates pulse current, and the heat input in the welding process is controlled by adjusting the peak current, the base current, the pulse frequency and the duty ratio of the welding power supply of the first welding gun so as to adapt to welding operations with different requirements;
s3, controlling the flow rate of the shielding gas input into the first welding gun and the second welding gun according to a preset speed, wherein the shielding gas input rates of the first welding gun and the second welding gun are consistent; inputting argon as protective gas at a speed of 18L/min; the first welding gun generates electric arcs which are coupled with the second welding gun to weld the surface of the workpiece to be welded.
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| CN111755172A (en) * | 2020-05-29 | 2020-10-09 | 广东金桥科技股份有限公司 | Manufacturing method of coaxial cable |
| CN115106622B (en) * | 2022-07-08 | 2024-02-02 | 中国核工业华兴建设有限公司 | Nuclear power station stainless steel pool double tungsten electrode hot wire TIG automatic welding construction method |
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| EP0053006A1 (en) * | 1980-11-21 | 1982-06-02 | Hitachi, Ltd. | Two electrode welding method |
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| CN103273177A (en) * | 2013-06-05 | 2013-09-04 | 天津大学 | Double-TIG (tungsten inert gas) welding system for thick plates and welding method implemented by double-TIG welding system |
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| EP0053006A1 (en) * | 1980-11-21 | 1982-06-02 | Hitachi, Ltd. | Two electrode welding method |
| CN101817112A (en) * | 2010-05-17 | 2010-09-01 | 哈尔滨工业大学 | Single power supply single-surface serial double-TIG (Tungsten Inert Gas) arc welding method |
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