CN110064814B - Arc striking device of argon arc welding machine and arc striking method based on arc striking device - Google Patents
Arc striking device of argon arc welding machine and arc striking method based on arc striking device Download PDFInfo
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- CN110064814B CN110064814B CN201910448884.XA CN201910448884A CN110064814B CN 110064814 B CN110064814 B CN 110064814B CN 201910448884 A CN201910448884 A CN 201910448884A CN 110064814 B CN110064814 B CN 110064814B
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- arc
- resistor
- tungsten electrode
- pin
- arc striking
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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
- B23K9/06—Arrangements or circuits for starting the arc, e.g. by generating ignition voltage, or for stabilising the arc
- B23K9/067—Starting the arc
- B23K9/0672—Starting the arc without direct contact between electrodes
- B23K9/0673—Ionisation of the arc gap by means of a tension with a step front (pulses or high frequency tensions)
-
- 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
Abstract
The invention relates to an arc striking device of an argon arc welding machine, which is characterized in that: one end of a resistor R1 is connected with the output end of a control power supply V, the other end of the resistor R1 is connected with one end of an arc ignition switch N, the other end branching line of the arc ignition switch is respectively connected with one end of a resistor R2 and the input end of an arc ignition controller C, the output end of the arc ignition controller C is connected with the input end of a high-frequency oscillator or a high-voltage pulse generator G, the output branching line of the high-frequency oscillator or the high-voltage pulse generator G is respectively connected with a pin 1 of a tungsten electrode W, the input end of a welding power supply S and one end of a resistor R4, a pin 2 of the tungsten electrode W is connected with a workpiece, the other end of the resistor R4 is connected with a pin 1 of an OP1, the branching line 4 of a pin 1 of the optical coupler is respectively connected with the output end of the welding power supply S and one end of a resistor R. The invention uses high-frequency pulse with very low voltage to ignite the electric arc, thereby avoiding the tungsten clamping caused by the damage of the tungsten electrode clamping tip due to high voltage.
Description
Technical Field
The present invention relates to the field of electric welding machine technology, and more particularly to an arc striking device for an argon arc welding machine and an arc striking method based on the arc striking device.
Background
The direct-current tungsten electrode argon arc welding machine has good welding quality, and a process document of a plurality of important workpieces specifies that the direct-current tungsten electrode argon arc welding machine is used for welding. The direct current tungsten electrode argon arc is provided with a tungsten electrode W, and the end of the tungsten electrode W needs to be sharpened, so that the electric arc is concentrated. During arc striking, the tungsten electrode W is not allowed to be in contact with the workpiece, otherwise, the tip of the tungsten electrode W is burnt due to current, and the burnt tungsten tip is left in the workpiece to form a defect of 'tungsten clamping'. According to Eucalyptus regulations, when the distance between the tungsten electrode W and the workpiece is larger than 3mm, the electric arc is ignited. Therefore, arc striking devices are arranged in the direct-current tungsten electrode W argon arc welding machine, and a high-frequency oscillator or a high-voltage pulse generator G is a commonly used arc striking device. The high-frequency oscillator or the high-voltage pulse generator G can generate high-voltage pulses with the amplitude of 2000V-3000V and 150-260 KHz between the positive terminal and the negative terminal of the direct-current tungsten electrode W argon arc welding machine, and the pulses can break down the gap between the tungsten electrode W and a workpiece to ignite electric arcs. The existing arc striking method is shown in fig. 1 and comprises a tungsten electrode W, an arc striking switch N, a welding power source S, a resistor R1, a resistor R2, a resistor R3, an arc striking controller C and a high-frequency oscillator or high-voltage pulse generator G.
When a welder presses down the arc ignition switch N, the arc ignition controller C enables the high-frequency oscillator or the high-voltage pulse generator to emit high-frequency high-voltage pulses between the tungsten electrode W and the workpiece, the welding power supply S is connected with the tungsten electrode W, and arcs are ignited between the tungsten electrode W and the workpiece. However, the high-frequency high-voltage pulse also causes great interference to a control circuit of the welding machine, so that the circuit cannot work normally, and even elements are damaged. The output voltage of the high-frequency oscillator is reduced, interference can be reduced, and the arc striking distance is also reduced. The short arc striking distance makes the operation difficult for the welder. Therefore, the arc striking distance is greater than or equal to 3mm, which is used as the acceptance standard of argon arc welding machine.
In order to solve the interference of the high-frequency oscillator to a control circuit of a welding machine, a method of 'short circuit' arc striking is provided. Namely: firstly, the tungsten electrode W and the workpiece are in short circuit, when arc striking is carried out, current of about 5A passes between the tungsten electrode W and the workpiece, then the tungsten electrode W is lifted, and the arc is pulled up. This "short circuit" arc starting method, without high frequency interference, is its greatest advantage. However, the current flowing through the tungsten electrode W is insufficient, and the tip of the tungsten electrode W is burnt to form tungsten inclusions, although the current is only 5A. If the current passing between the tungsten electrode W and the workpiece is further reduced, the arc cannot be reliably ignited when the electrode is pulled up.
Disclosure of Invention
Aiming at the problems, the invention provides an arc striking device and an arc striking method of an argon arc welding machine.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: the arc striking device of the argon arc welding machine comprises a tungsten electrode W, an arc striking switch N, a welding power supply S, an arc striking controller C and a high-frequency oscillator or high-voltage pulse generator G, and is characterized in that: also comprises a control power supply V, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and an optical coupler OP1, one end of the resistor R1 is connected with the output end of the control power supply V, the other end is connected with one end of the arc striking switch N, the other end of the arc striking switch N is connected with one end of a resistor R2 and the input end of the arc striking controller C respectively through a branch line, the output end of the arc ignition controller C is connected with the input end of a high-frequency oscillator or a high-voltage pulse generator G, the output end of the high-frequency oscillator or the high-voltage pulse generator G is respectively connected with the pin 1 of the tungsten electrode W, the input end of the welding power supply S and one end of the resistor R4, the pin 2 of the tungsten electrode W is connected with a workpiece, the other end of the resistor R4 is connected with the pin 1 of the optical coupler OP1, the pin 4 of the optical coupler OP1 is connected with the output end of the welding power supply S and one end of the resistor R3 in a branching manner, and the other end of the resistor R3 is connected with the input end of the control power supply V.
Further, the other end of the resistor R2, the workpiece, and the pin 2 and the pin 3 of the optical coupler OP1 are all grounded.
Furthermore, the high-frequency oscillator or the high-voltage pulse generator G, the tungsten electrode W and the workpiece form a tungsten electrode short circuit judging circuit B.
Further, the model of the optical coupler OP1 is PC 817.
In order to solve the technical problems in the background art, the invention also provides an arc striking method based on the arc striking device, which is characterized in that: the arc striking method for argon arc welding comprises the following specific steps:
a. pressing down an arc striking switch N, electrifying a high-frequency oscillator or a high-voltage pulse generator G, and sending out high-frequency high-voltage pulses;
b. when the tungsten electrode W contacts a workpiece, a pin 1 of the optical coupler OP1 is at a low level, a pin 4 of the optical coupler OP1 is at a high level, and the welding power supply S is turned off;
c. when welding is started, a welder slowly lifts a tungsten electrode W, when the tungsten electrode W is separated from a workpiece, a pin 1 of the optical coupler OP1 is at a high level, a pin 4 of the optical coupler OP1 is at a low level, a welding power supply S is switched on, and an electric arc is ignited.
The invention has the beneficial effects that:
(1) the arc striking method for the argon arc welding machine disclosed by the invention is characterized in that under the condition that the distance between a tungsten electrode W and a workpiece is very close, high-frequency pulses strike an arc, so that the interference of the high-frequency high-voltage arc striking pulses on a control circuit of the welding machine or a robot is reduced.
(2) The invention uses high-frequency pulse with very low voltage to ignite the electric arc, thereby avoiding the tungsten clamping caused by the damage of the tungsten electrode W clamping tip due to high voltage.
(3) By adopting the circuit designed by the arc striking method of the argon arc welding machine disclosed by the invention, a welder does not need training, and only needs to lift the tungsten electrode W, the arc can be struck by high-frequency pulse with very low voltage under the condition that the tungsten electrode W is very close to a workpiece. The phenomenon that a welder is difficult to accurately control the closer distance between the tungsten electrode W and the workpiece is avoided, and the operation of the welder is facilitated.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts. FIG. 1 is a structural diagram of an arc striking device for argon arc welding in the prior art.
FIG. 2 is a structural diagram of an arc striking device for argon arc welding according to the present invention.
Fig. 3 is a flowchart illustrating a tungsten electrode short circuit determination method according to the present invention.
FIG. 4 is a structural diagram of an arc striking device for argon arc welding according to the present invention.
Detailed Description
The technical solution of the present invention will be clearly and completely described by the following detailed description.
The invention relates to an arc striking device and an arc striking method of an argon arc welding machine, wherein the specific structure of the arc striking device is shown in figure 2: the arc striking device comprises a welding power supply S, a tungsten electrode short circuit judging circuit B, an arc striking controller C and a high-frequency oscillator or high-voltage pulse generator G, and the specific principle is as follows:
(1) the tungsten electrode W is short-circuited with the workpiece, and a current of 1mA or less flows through the tungsten electrode, and this current is used only to judge whether the tungsten electrode has been detached from the workpiece, and the current does not burn the tip of the tungsten electrode.
(2) And simultaneously measuring the voltage U between the tungsten electrode W and the workpiece, wherein the voltage U =0 between the tungsten electrode W and the workpiece when the tungsten electrode W is in short circuit with the workpiece.
(3) The arc initiation process is shown in fig. 3: the tungsten electrode W is contacted with a workpiece, the voltage U between the tungsten electrode W and the workpiece is 0V, the tungsten electrode W is slowly lifted, when the voltage U between the tungsten electrode W and the workpiece is just larger than 0V, the tungsten electrode W is separated from the workpiece, but the distance between the tungsten electrode W and the workpiece is very close, a high-frequency oscillator or a high-voltage pulse generator G is switched on at the moment, a welding power supply N is switched on or a contactor J is switched on at the same time, and an electric arc is ignited. Because the distance between the tungsten electrode W and the workpiece is very close, the high-frequency oscillator or the high-voltage pulse generator G can ignite the electric arc only by sending out high-frequency pulses with very low voltage, and the very low high-frequency voltage can not generate interference on a circuit.
In view of the above arc striking principle, the following describes an arc striking device and an arc striking method of an argon arc welding machine according to the present invention.
The structure diagram of the argon arc welding device of the invention is shown in FIG. 4: the device comprises a tungsten electrode W, an arc ignition switch N, a welding power supply S, an arc ignition controller C, a high-frequency oscillator or a high-voltage pulse generator G, a control power supply V, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and an optical coupler OP1, wherein one end of a resistor R1 is connected with the output end of the control power supply V, the other end of the resistor V is connected with one end of the arc ignition switch N, the branch lines of the other end of the arc ignition switch N are respectively connected with one end of a resistor R2 and the input end of the arc ignition controller C, the output end of the arc ignition controller C is connected with the input end of the high-frequency oscillator or the high-voltage pulse generator G, the branch lines of the output end of the high-frequency oscillator or the high-voltage pulse generator G are respectively connected with a pin 1 of the tungsten electrode W, the input end of the welding power supply S and one end of the resistor R4, a pin 2 of the tungsten electrode W is connected with a workpiece, the other end of the resistor R5 is connected with a pin 1 of, the other end of the resistor R3 is connected with the input end of a control power supply V, and the model of the optocoupler OP1 is PC 817. The other end of the resistor R2, the workpiece, and the pin 2 and the pin 3 of the optical coupler OP1 are all grounded. Wherein the high-frequency oscillator or the high-voltage pulse generator G, the tungsten electrode W and the workpiece form a tungsten electrode short circuit judging circuit B.
The arc striking method of the arc striking device based on argon arc welding comprises the following specific steps:
a. pressing down an arc striking switch N, electrifying a high-frequency oscillator or a high-voltage pulse generator G, and sending out high-frequency high-voltage pulses;
b. when the tungsten electrode W contacts a workpiece, a pin 1 of the optical coupler OP1 is at a low level, a pin 4 of the optical coupler OP1 is at a high level, and the welding power supply S is turned off;
c. when welding is started, a welder slowly lifts a tungsten electrode W, when the tungsten electrode W is separated from a workpiece, a pin 1 of the optical coupler OP1 is at a high level, a pin 4 of the optical coupler OP1 is at a low level, a welding power supply S is switched on, and an electric arc is ignited.
The above-mentioned embodiments are merely descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art should fall into the protection scope of the present invention without departing from the design concept of the present invention, and the technical contents of the present invention as claimed are all described in the technical claims.
Claims (5)
1. The utility model provides an arc ignition device of argon arc welding machine, includes by tungsten electrode W, arc ignition switch N, welding source S, arc ignition controller C, high frequency oscillator or high-voltage pulse generator G constitute its characterized in that: also comprises a control power supply V, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and an optical coupler OP1, one end of the resistor R1 is connected with the output end of the control power supply V, the other end is connected with one end of the arc striking switch N, the other end of the arc striking switch N is connected with one end of a resistor R2 and the input end of the arc striking controller C respectively through a branch line, the output end of the arc ignition controller C is connected with the input end of a high-frequency oscillator or a high-voltage pulse generator G, the output end of the high-frequency oscillator or the high-voltage pulse generator G is respectively connected with the pin 1 of the tungsten electrode W, the input end of the welding power supply S and one end of the resistor R4, the pin 2 of the tungsten electrode W is connected with a workpiece, the other end of the resistor R4 is connected with the pin 1 of the optical coupler OP1, the pin 4 of the optical coupler OP1 is connected with the output end of the welding power supply S and one end of the resistor R3 in a branching manner, and the other end of the resistor R3 is connected with the input end of the control power supply V.
2. The arc striking device of the argon arc welding machine according to claim 1, characterized in that: the other end of the resistor R2, the workpiece and the pin 2 and the pin 3 of the optical coupler OP1 are all grounded.
3. The arc striking device of the argon arc welding machine according to claim 1, characterized in that: the high-frequency oscillator or the high-voltage pulse generator G, the tungsten electrode W and the workpiece form a tungsten electrode short circuit judging circuit B.
4. The arc striking device of the argon arc welding machine according to claim 1, characterized in that: the model of the optical coupler OP1 is PC 817.
5. An arc striking method based on the arc striking device of the argon arc welding machine of claim 1, characterized in that: the arc striking method of the arc striking device comprises the following specific steps:
a. pressing down an arc striking switch N, electrifying a high-frequency oscillator or a high-voltage pulse generator G, and sending out high-frequency high-voltage pulses;
b. when the tungsten electrode W contacts a workpiece, a pin 1 of the optical coupler OP1 is at a low level, a pin 4 of the optical coupler OP1 is at a high level, and the welding power supply S is turned off;
c. when welding is started, a welder slowly lifts a tungsten electrode W, when the tungsten electrode W is separated from a workpiece, a pin 1 of the optical coupler OP1 is at a high level, a pin 4 of the optical coupler OP1 is at a low level, a welding power supply S is switched on, and an electric arc is ignited.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910448884.XA CN110064814B (en) | 2019-05-28 | 2019-05-28 | Arc striking device of argon arc welding machine and arc striking method based on arc striking device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910448884.XA CN110064814B (en) | 2019-05-28 | 2019-05-28 | Arc striking device of argon arc welding machine and arc striking method based on arc striking device |
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| CN110064814A CN110064814A (en) | 2019-07-30 |
| CN110064814B true CN110064814B (en) | 2021-06-29 |
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| CN201910448884.XA Expired - Fee Related CN110064814B (en) | 2019-05-28 | 2019-05-28 | Arc striking device of argon arc welding machine and arc striking method based on arc striking device |
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Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2119135C3 (en) * | 1971-04-20 | 1974-03-14 | Messer Griesheim Gmbh, 6000 Frankfurt | Welding power source |
| US4717807A (en) * | 1986-12-11 | 1988-01-05 | The Lincoln Electric Company | Method and device for controlling a short circuiting type welding system |
| CN1084793A (en) * | 1992-09-28 | 1994-04-06 | 机械电子工业部成都电焊机研究所 | A kind of pulsed tungsten argon arc weld(ing) machine controller |
| CN101927392A (en) * | 2009-06-25 | 2010-12-29 | 上海沪工电焊机制造有限公司 | Electric welder arc striking device |
| CN102218581B (en) * | 2011-04-28 | 2013-11-20 | 北京工业大学 | Composite high-frequency pulse welding system and process |
| US9393636B2 (en) * | 2012-11-13 | 2016-07-19 | Lincoln Global, Inc. | Systems and methods to facilitate the starting and stopping of arc welding processes |
| CN103264214B (en) * | 2013-04-28 | 2015-03-04 | 华中科技大学 | Arcing circuit for plasma arc cutting |
| CN106563864B (en) * | 2016-10-18 | 2018-03-23 | 江门市金鸿升金属制品有限公司 | High-frequency impulse arc initiation device on DC welder |
| CN106825884A (en) * | 2017-02-20 | 2017-06-13 | 上海威特力焊接设备制造股份有限公司 | A kind of CUT turns arc circuit and method |
| CN207982508U (en) * | 2017-12-27 | 2018-10-19 | 兰州石化职业技术学院 | A kind of novel built-in promotion arc strike control device of TIG welderings |
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- 2019-05-28 CN CN201910448884.XA patent/CN110064814B/en not_active Expired - Fee Related
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Inventor after: Shi Weiyi Inventor after: Liu Qiang Inventor after: Zhao Kongbiao Inventor after: Chen Fulan Inventor before: Shi Weiyi Inventor before: Liu Qiang Inventor before: Zhao Sunbiao Inventor before: Chen Fulan |
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