CN214350181U - Argon arc welding device - Google Patents

Abstract

The utility model provides an argon arc welds device belongs to welding technical field, and argon arc welds the device and includes: the input end of the power supply circuit is connected with an external power supply, the output end of the power supply circuit is connected with a positive/negative output interface of the argon arc welding device, the power supply circuit comprises a main circuit and an auxiliary circuit, and the auxiliary circuit is used for providing auxiliary voltage between a tungsten electrode and a base metal; the detector is used for detecting the voltage between the tungsten electrode and the base metal and outputting a detection result; the input end of the processor is connected with the output end of the detector, and the processor is used for determining the direct current which should be output by the main circuit according to the detection result of the detector; and the input end of the main controller is connected with the output end of the processor, and the main controller is used for controlling the main circuit according to the processing result output by the processor. The argon arc welding device is used for small-current contact arc striking, and the power circuit, the detector, the processor and the main controller can monitor and control different stages in the small-current contact arc striking.

Description

Argon arc welding device

Technical Field

The utility model belongs to the technical field of the welding, concretely relates to argon arc welds device.

Background

Aluminum alloys are the most widely used non-ferrous structural materials in industry and have been used in large quantities in automotive, mechanical manufacturing, and aerospace applications. Along with the development of scientific technology and industrial economy in China, the processing of aluminum and aluminum alloy is rapidly developed, and the welding of the aluminum and the aluminum alloy also becomes a hot spot.

The current is periodically changed during alternating current argon arc welding (alternating current TIG for short), and the tungsten electrode is cooled and electrons are emitted to maintain the stability of the electric arc during positive half wave; and an oxidation film can be removed during negative half-wave so as to obtain a good welding line, so that the welding method is widely applied to welding of metals such as aluminum, aluminum alloy and the like. Because aluminum and aluminum alloys have strong oxidizability, and are easily combined with oxygen to form a dense aluminum oxide film, the melting point of the film is extremely high (about 2050 ℃), which is far higher than the melting points of aluminum and aluminum alloys (about 600 ℃), and how to successfully strike arcs in alternating current TIG becomes an important research topic.

The traditional TIG welding usually adopts a high-frequency high-voltage non-contact arc striking device, the high-frequency high-voltage non-contact arc striking is to apply high-frequency voltage generated by a high-frequency oscillator between a tungsten electrode and a base metal, the electric arc is ignited by breaking down an air gap between the tungsten electrode and the base metal, and the high-frequency voltage is cut off rapidly after the electric arc is ignited. The high-frequency high-voltage non-contact arc striking has good arc striking effect, but the welding power supply can generate larger interference during the high-frequency arc striking, easily interferes peripheral equipment and has certain harm to people. In addition, in some special occasions, the use of high-frequency high-voltage arc striking is prohibited.

Therefore, there is a need for an argon arc welding apparatus that does not require high frequency and high voltage for arc striking.

The above information disclosed in the background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not constitute prior art that is known to a person of ordinary skill in the art.

SUMMERY OF THE UTILITY MODEL

The purpose of the present disclosure is to provide an argon arc welding device that does not require high frequency and high voltage for arc striking.

In order to realize the purpose of the utility model, the following technical scheme is adopted in the present disclosure:

according to a first aspect of the present disclosure, there is provided an argon arc welding apparatus comprising:

the input end of the power supply circuit is connected with an external power supply, the output end of the power supply circuit is connected with a positive/negative output interface of the argon arc welding device, the power supply circuit comprises a main circuit and an auxiliary circuit which are mutually independent, the main circuit inverts direct current after external alternating current is rectified into alternating current and then rectifies the alternating current into low-voltage direct current for output, the auxiliary circuit is used for converting the external alternating current into low-voltage electricity and then rectifies the low-voltage alternating current for output, and the auxiliary circuit is used for providing auxiliary voltage between a tungsten electrode and a base metal;

a detector for detecting a voltage between the tungsten electrode and the base material and outputting a detection result;

the input end of the processor is connected with the output end of the detector, and the processor is used for determining the direct current which should be output by the main circuit according to the detection result of the detector;

the input end of the main controller is connected with the output end of the processor, the output end of the main controller is connected with the main circuit, and the main controller is used for controlling the main circuit according to a processing result output by the processor.

In an exemplary embodiment of the present disclosure, the main circuit includes an insulated gate bipolar transistor, and the main controller controls a conduction width of the insulated gate bipolar transistor.

In an exemplary embodiment of the present disclosure, the main circuit includes:

the input end of the first rectifying circuit is connected with an external power supply, and the first rectifying circuit rectifies externally input alternating current and then outputs the rectified alternating current;

the input end of the inverter circuit is connected with the output end of the first rectifying circuit, and the inverter circuit inverts the direct current rectified by the first rectifying circuit into alternating current and outputs the alternating current;

the input end of the first transformer is connected with the output end of the inverter circuit, and the first transformer converts the alternating current inverted by the inverter circuit into low-voltage power and outputs the low-voltage power;

and the input end of the second rectifying circuit is connected with the output end of the first transformer, and the second rectifying circuit rectifies the alternating current output by the first transformer after the alternating current is output.

In an exemplary embodiment of the present disclosure, the inverter circuit and the second rectification circuit each include the insulated gate bipolar transistor.

In an exemplary embodiment of the present disclosure, the auxiliary circuit includes:

the input end of the second transformer is connected with an external power supply, and the second transformer converts the externally input alternating current into low voltage and outputs the low voltage;

and the input end of the rectification voltage stabilizing circuit is connected with the output end of the second transformer, and the rectification voltage stabilizing circuit rectifies the low-voltage electricity converted by the second transformer into direct current for output.

In this disclosure's exemplary embodiment, argon arc welding set still includes auxiliary control ware, auxiliary control ware with auxiliary circuit connects, auxiliary control ware is used for controlling auxiliary circuit.

In an exemplary embodiment of the present disclosure, the processor includes:

the input end of the comparison unit is connected with the output end of the detector, and the comparison unit is used for comparing the detection result output by the detector with the judgment voltage and outputting the comparison result;

the input end of the judging unit is connected with the output end of the comparing unit, and the judging unit judges the magnitude of the direct current which should be output by the main circuit according to the comparison result output by the comparing unit and outputs a judgment result;

and the input end of the operation unit is connected with the output end of the judgment unit, and the operation unit calculates the conduction width of the insulated gate bipolar transistor corresponding to the direct current which should be output by the main circuit according to the judgment result output by the judgment unit.

In this open exemplary embodiment, argon arc welding set is used for contacting the striking, contact striking includes first electric current stage, second electric current stage, striking current stage and welding current stage in proper order, first electric current is less than the second electric current, the second electric current is less than striking current, auxiliary control ware control auxiliary circuit is in first electric current stage with the second electric current stage output auxiliary voltage.

In an exemplary embodiment of the present disclosure, the first current is 0.5 to 5A, the second current is 15 to 25A, and the determination voltage is 4.5 to 5.5V.

In an exemplary embodiment of the disclosure, the argon arc welding device further includes a memory, and the memory is used for storing preset contact arc ignition parameters, and the contact arc ignition parameters include the first current, the second current, the arc ignition current, the welding current and the determination voltage.

The power circuit comprises a main circuit and an auxiliary circuit, wherein the main circuit is used for providing a main power supply between a tungsten electrode and a base metal, and the auxiliary circuit is used for providing an auxiliary power supply between the tungsten electrode and the base metal. The detector is used for detecting the voltage between the tungsten electrode and the base material, for example, in small current contact arc starting, when the tungsten electrode is in contact with the base material, the voltage between the tungsten electrode and the base material detected by the detector is almost zero, and when the tungsten electrode is lifted, the detector detects that the voltage between the tungsten electrode and the base material is rapidly increased. The processor determines the magnitude of the direct current correspondingly output by the main circuit between the tungsten electrode and the parent metal according to the detection result of the detector, and if the detector detects that the voltage between the tungsten electrode and the parent metal is rapidly increased, the processor can judge that the magnitude of the direct current correspondingly output by the main circuit at the moment is the arc striking current according to the result. The main controller controls the main circuit to output corresponding current according to the result of the processor. The power circuit, the detector, the processor and the main controller in the disclosure can realize monitoring and control of different stages in small current contact arc ignition, wherein an auxiliary circuit in the power circuit is helpful for enhancing the sensitivity of voltage detection between a tungsten electrode and a parent metal, and accurate judgment of different stages in small current contact arc ignition is realized, thereby being helpful for enhancing the success rate of contact arc ignition.

Drawings

The above and other features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

FIG. 1 is a state diagram of high-frequency high-voltage non-contact arc ignition control in the related art;

FIG. 2 is a diagram of a contact arc initiation state in an exemplary embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of an argon arc welding device in an exemplary embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a main circuit structure in an exemplary embodiment of the disclosure;

FIG. 5 is a schematic diagram of an auxiliary circuit in an exemplary embodiment of the present disclosure;

FIG. 6 is a schematic diagram of an auxiliary circuit controlled by an auxiliary controller in an exemplary embodiment of the present disclosure;

fig. 7 is a schematic diagram of a processor in an exemplary embodiment of the disclosure.

The reference numerals of the main elements in the figures are explained as follows:

the argon arc welding device comprises a 10 argon arc welding device, a 100 power supply circuit, a 110 main circuit, a 111 first rectifying circuit, a 112 inverter circuit, a 113 first transformer, a 114 second rectifying circuit, a 120 auxiliary circuit, a 121 second transformer, a 122 rectifying and voltage stabilizing circuit, a 200 detector, a 300 processor, a 310 comparing unit, a 320 judging unit, a 330 arithmetic unit, a 400 main controller, a 500 auxiliary controller and a 600 memory.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure.

In the drawings, the thickness of regions and layers may be exaggerated for clarity. The same reference numerals denote the same or similar structures in the drawings, and thus detailed descriptions thereof will be omitted.

The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the embodiments of the disclosure can be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring the primary technical ideas of the disclosure.

When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.

The terms "a," "an," "the," and the like are used to denote the presence of one or more elements/components/parts; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc. The terms "first" and "second", etc. are used merely as labels, and are not limiting on the number of their objects.

In the related art, non-contact arc striking of argon arc welding needs high frequency and high voltage, and a corresponding argon arc welding device provides high frequency and high voltage current for the argon arc welding device. As shown in fig. 1, fig. 1 is a state diagram of a related art non-contact arc striking using a high frequency and high voltage, which is applied between a tungsten electrode and a base material when a torch is turned on, to break down an air gap therebetween to ignite an arc. However, the use of high frequency and high voltage for arc ignition is not only hazardous to humans, but also can interfere with surrounding electronics and radio communications. In order to solve the problem, related technicians propose to use small current to contact the arc, that is, to use small current when the tungsten electrode contacts with the base metal, and when the tungsten electrode is lifted, the power supply quickly establishes a strong electric field between the tungsten electrode and the base metal, so that the arc is ignited. However, at present, there is no corresponding argon arc welding device for the low current contact arc ignition method, so that the low current contact arc ignition method still has difficulty in use.

Referring to fig. 3, in order to overcome the drawbacks of the related art, the present disclosure provides an argon arc welding apparatus 10, wherein the argon arc welding apparatus 10 can perform low current contact arc striking without using high frequency and high voltage. The argon arc welding device 10 provided by the present disclosure comprises a power circuit 100, a detector 200, a processor 300 and a main controller 400, wherein an input end of the power circuit 100 is connected with an external power supply, an output end of the power circuit 100 is connected with a positive/negative output interface of the argon arc welding device, the power circuit 100 comprises a main circuit 110 and an auxiliary circuit 120 which are mutually independent, the main circuit 110 inverts direct current after external alternating current is rectified into alternating current and then rectifies the alternating current into low-voltage direct current for output, the auxiliary circuit 120 is used for converting the external alternating current into low-voltage and then rectifies the low-voltage alternating current into direct current for output, and the auxiliary circuit 120 is used for providing auxiliary voltage between a tungsten electrode and a parent metal. The detector 200 detects a voltage between the tungsten electrode and the base material and outputs a detection result. The input end of the processor 300 is connected to the output end of the detector 200, and the processor 300 is configured to determine the magnitude of the dc power that the main circuit 110 should output according to the detection result of the detector 200. The input terminal of the main controller 400 is connected to the output terminal of the processor 300, the output terminal of the main controller 400 is connected to the main circuit 110, and the main controller 400 is configured to control the main circuit 110 according to the processing result output by the processor 300.

In the argon arc welding apparatus 10 provided by the present disclosure, the power circuit 100 includes a main circuit 110 and an auxiliary circuit 120, the main circuit 110 is used for providing a main power source between the tungsten electrode and the base material, and the auxiliary circuit 120 is used for providing an auxiliary power source between the tungsten electrode and the base material. The detector 200 is used to detect the voltage between the tungsten electrode and the base material, and when the tungsten electrode is in contact with the base material, the voltage between the tungsten electrode and the base material detected by the detector 200 is almost zero, and when the tungsten electrode is lifted up, the detector 200 detects a rapid rise in the voltage between the tungsten electrode and the base material, as in the small current contact arc starting. The processor 300 determines the magnitude of the dc power correspondingly output by the main circuit 110 between the tungsten electrode and the base material according to the detection result of the detector 200, and if the detector 200 detects that the voltage between the tungsten electrode and the base material is rapidly increased, the processor 300 can determine that the magnitude of the dc power correspondingly output by the main circuit 110 at this time is the arc striking current according to the result. The main controller 400 controls the main circuit 110 to output a corresponding current according to the result of the processor 300. The power circuit 100, the detector 200, the processor 300 and the main controller 400 in the present disclosure can realize monitoring and control of different stages in the low current contact arc ignition, wherein the auxiliary circuit 120 in the power circuit 100 helps to enhance the sensitivity of voltage detection between the tungsten electrode and the base metal, and realizes accurate judgment of different stages in the low current contact arc ignition, thereby helping to enhance the success rate of contact arc ignition.

As shown in fig. 4, in an embodiment of the present disclosure, the main circuit 110 includes an Insulated Gate Bipolar Transistor (IGBT), and the main controller 400 controls a conduction width, i.e., a pulse width, of the IGBT, so as to change a current output by the main circuit 110. The IGBT is a composite full-control voltage-driven power semiconductor device consisting of BJTs (bipolar transistors) and MOSFETs (insulated gate field effect transistors). The main controller 400 controls the magnitude of the current output by the main circuit 110 by controlling the on-width of the IGBT, and specifically, the main controller 400 controls the on-width of the IGBT by the pulse generating circuit. The pulse generating circuit can adopt an integrated pulse width modulator, and the pulse width is changed according to the current set value through circuit connection. The specific pulse generating circuit can adopt a connecting circuit in the prior art, and is not described in detail here.

As shown in fig. 4, the main circuit 110 includes a first rectifying circuit 111, an inverter circuit 112, a first transformer 113, and a second rectifying circuit 114, wherein an input end of the first rectifying circuit 111 is connected to an external power source, and the first rectifying circuit 111 rectifies an externally input ac power and outputs the rectified ac power; the input end of the inverter circuit 112 is connected with the output end of the first rectifying circuit 111, and the inverter circuit 112 inverts the direct current rectified by the first rectifying circuit 111 into alternating current and outputs the alternating current; the input end of the first transformer 113 is connected with the output end of the inverter circuit 112, and the first transformer 113 converts the alternating current inverted by the inverter circuit 112 into low-voltage electricity for output; the input end of the second rectifying circuit 114 is connected with the output end of the first transformer 113, the second rectifying circuit 114 rectifies the alternating current output by the first transformer 113, and the alternating current is output, wherein the inverting circuit 112 and the second rectifying circuit comprise insulated gate bipolar transistors. An external alternating current power supply is rectified into direct current by the first rectifying circuit 111, then converted into alternating current by the inverter circuit 112, converted into low voltage electricity by the transformer, and rectified into low voltage direct current by the second rectifying circuit 114, so that the low voltage direct current is provided between the tungsten electrode and the parent metal.

As shown in fig. 5, in an embodiment of the present disclosure, the auxiliary circuit 120 includes a second transformer 121 and a rectifying and voltage stabilizing circuit 122, wherein an input end of the second transformer 121 is connected to an external power supply, and the second transformer 121 converts an externally input ac power into a low voltage power and outputs the low voltage power; the input end of the rectifying and stabilizing circuit 122 is connected with the output end of the second transformer 121, and the rectifying and stabilizing circuit 122 rectifies the low-voltage electricity converted by the second transformer 121 into direct current for output. After the external ac power source is changed into low-voltage ac power by the second transformer 121, the low-voltage ac power is rectified by the rectifying and voltage-stabilizing circuit 122 to output low-voltage dc power. As shown in fig. 5, an external AC power source is transformed into AC24V through a second transformer 121, and then rectified by a rectifying and stabilizing circuit 122 to output DC24V, thereby providing 24V DC power between the tungsten electrode and the base material. In the disclosure, when a low-current contact arc striking method is adopted, when the main circuit 110 outputs a low current, the corresponding output voltage is also low, and meanwhile, the conduction width of the IGBT is also small, so that the output electric ripple of the main circuit 110 is large, and the detector 200 is difficult to accurately collect voltage, so that the contact state between the tungsten electrode and the base metal is difficult to judge, and the increase of the auxiliary circuit 120 is helpful to improve the accuracy of collecting voltage by the detector 200, so that the contact state between the tungsten electrode and the base metal is accurately judged, and the success rate of contact arc striking is improved.

As shown in fig. 3, in an embodiment of the present disclosure, the argon arc welding apparatus 10 further includes an auxiliary controller 500, the auxiliary controller 500 is configured to control the auxiliary circuit 120, and control the auxiliary circuit 120 to provide an auxiliary voltage between the tungsten electrode and the base material. As shown in FIG. 6, the auxiliary controller 500 controls Q1/PC1 to be turned on, the CR1A coil is turned on accordingly, and the CR1B/CR1C contact is attracted, so that the auxiliary voltage is applied between the tungsten electrode and the base material.

As shown in fig. 7, the processor 300 includes a comparing unit 310, a determining unit 320, and an operating unit 330, wherein an input terminal of the comparing unit 310 is connected to an output terminal of the detector 200, and the comparing unit 310 is configured to compare a detection result output by the detector 200 with a magnitude of the determination voltage and output the comparison result. The input terminal of the determining unit 320 is connected to the output terminal of the comparing unit 310, and the determining unit 320 determines the magnitude of the dc power to be output by the main circuit 110 according to the comparison result output by the comparing unit 310 and outputs the determination result. The input terminal of the operation unit 330 is connected to the output terminal of the determination unit 320, and the operation unit 330 calculates the on width of the igbt corresponding to the dc power to be output by the main circuit 110, based on the determination result output by the determination unit 320.

The argon arc welding apparatus 10 provided by the present disclosure will be described in detail below with reference to specific contact arc ignition methods in the present disclosure.

As shown in fig. 2, the contact arc striking in the present disclosure includes a first current phase, a second current phase, an arc striking current phase, and a welding current phase in sequence, where the first current is smaller than the second current, and the second current is smaller than the arc striking current, and the auxiliary controller 500 controls the auxiliary circuit 120 to output the auxiliary voltage in the first current phase and the second current phase. Specifically, when the tungsten electrode contacts the base metal to form a short circuit, the main circuit 110 outputs a first current, which is a first current phase. The first current is small, typically about 4A, for about 100ms, and does not melt but merely preheats the tungsten electrode and the parent metal. After the first current phase is finished, the output current of the main circuit 110 increases to a second current, which is a second current phase, and the second current value is larger and is about 20A. After the tungsten electrode is pulled, the arc striking current stage is started, and then the welding current stage is continuously started, so that the process from arc striking to welding of the alternating current TIG is realized.

As shown in fig. 3, the argon arc welding apparatus 10 provided by the present disclosure further includes a memory 600 for storing preset contact arc-striking parameters, which include a first current, a second current, an arc-striking current, a welding current and a determination voltage.

When the argon arc welding device 10 is used for contact arc striking, the use steps comprise:

(1) starting the argon arc welding device 10;

(2) setting contact arc striking parameters such as a first current, a second current, an arc striking current, a contact current and a judgment voltage;

(3) performing contact arc striking, wherein the detector 200 detects the voltage between the tungsten electrode and the parent metal in the process; the processor 300 determines the magnitude of the direct current to be output by the main circuit 110 according to the detection result of the detector 200; the main controller 400 controls the main circuit 110 according to the processing result output from the processor 300.

When the tungsten electrode is in contact short circuit with the parent metal, the detector 200 detects that the voltage between the tungsten electrode and the parent metal is almost 0V and is less than the judgment voltage 5V, therefore, the processor 300 judges that the contact arc striking is in a first current stage at the moment according to the detection result, the current output by the main circuit 110 is a first current, and the main controller 400 controls the main circuit 110 to output the first current according to the processing result;

after the first current phase is finished, for example, after 100ms is output (the specific time can be set according to the actual situation, for example, 80-120ms can be output), the first current phase is finished. The main circuit 110 then starts to output a second current, and enters a second current stage, in the process, the detector 200 continues to detect the voltage between the tungsten electrode and the parent metal, when the voltage between the tungsten electrode and the parent metal is detected to be rapidly increased (greater than the determination voltage by 5V), the processor 300 determines that the tungsten electrode is pulled according to the detection result, and at this time, an arc striking stage should be entered, the current output by the main circuit 110 should be an arc striking current, the main controller 400 controls the main circuit 110 to output the arc striking current according to the processing result, and then outputs the welding current, so that the arc striking is completed and the normal welding stage is entered.

In the contact arc striking process, the auxiliary controller 500 controls the auxiliary circuit 120 to supply the auxiliary voltage between the tungsten electrode and the base material in the first current stage and the second current stage. Specifically, one end of the auxiliary controller 500 may be connected to the processor 300, and when the processor 300 determines that the tungsten electrode is pulled according to the detection result, the auxiliary controller 500 may control the auxiliary circuit 120 to be turned off according to the detection result, so as not to provide the auxiliary voltage between the tungsten electrode and the base material.

It is to be understood that the disclosure is not limited in its application to the details of construction and the arrangements of the components set forth in the specification. The present disclosure is capable of other embodiments and of being practiced and carried out in various ways. The foregoing variations and modifications are within the scope of the present disclosure. It should be understood that the disclosure disclosed and defined in this specification extends to all alternative combinations of two or more of the individual features mentioned or evident from the text and/or drawings. All of these different combinations constitute various alternative aspects of the present disclosure. The embodiments of this specification illustrate the best mode known for carrying out the disclosure and will enable those skilled in the art to utilize the disclosure.

Claims (7)

1. An argon arc welding device is characterized by comprising:

the input end of the power supply circuit is connected with an external power supply, the output end of the power supply circuit is connected with a positive/negative output interface of the argon arc welding device, the power supply circuit comprises a main circuit and an auxiliary circuit which are mutually independent, the main circuit inverts direct current after external alternating current is rectified into alternating current and then rectifies the alternating current into low-voltage direct current for output, the auxiliary circuit is used for converting the external alternating current into low-voltage electricity and then rectifies the low-voltage alternating current for output, and the auxiliary circuit is used for providing auxiliary voltage between a tungsten electrode and a base metal;

a detector for detecting a voltage between the tungsten electrode and the base material and outputting a detection result;

the input end of the processor is connected with the output end of the detector, and the processor is used for determining the direct current which should be output by the main circuit according to the detection result of the detector;

the input end of the main controller is connected with the output end of the processor, the output end of the main controller is connected with the main circuit, and the main controller is used for controlling the main circuit according to a processing result output by the processor.

2. The argon arc welding device according to claim 1, wherein the main circuit comprises an insulated gate bipolar transistor, and the main controller controls a conduction width of the insulated gate bipolar transistor.

3. The argon arc welding device according to claim 2, wherein the main circuit comprises:

the input end of the first rectifying circuit is connected with an external power supply, and the first rectifying circuit rectifies externally input alternating current and then outputs the rectified alternating current;

the input end of the inverter circuit is connected with the output end of the first rectifying circuit, and the inverter circuit inverts the direct current rectified by the first rectifying circuit into alternating current and outputs the alternating current;

the input end of the first transformer is connected with the output end of the inverter circuit, and the first transformer converts the alternating current inverted by the inverter circuit into low-voltage power and outputs the low-voltage power;

and the input end of the second rectifying circuit is connected with the output end of the first transformer, and the second rectifying circuit rectifies the alternating current output by the first transformer after the alternating current is output.

4. The argon arc welding device according to claim 3, wherein the inverter circuit and the second rectifying circuit both comprise the insulated gate bipolar transistor.

5. The argon arc welding device according to claim 1, wherein the auxiliary circuit comprises:

the input end of the second transformer is connected with an external power supply, and the second transformer converts the externally input alternating current into low voltage and outputs the low voltage;

and the input end of the rectification voltage stabilizing circuit is connected with the output end of the second transformer, and the rectification voltage stabilizing circuit rectifies the low-voltage electricity converted by the second transformer into direct current for output.

6. The argon arc welding device of claim 2, further comprising an auxiliary controller, wherein the auxiliary controller is connected to the auxiliary circuit, and the auxiliary controller is used for controlling the auxiliary circuit.

7. The argon arc welding apparatus of claim 6, wherein the processor comprises:

the input end of the comparison unit is connected with the output end of the detector, and the comparison unit is used for comparing the detection result output by the detector with the judgment voltage and outputting the comparison result;

the input end of the judging unit is connected with the output end of the comparing unit, and the judging unit judges the magnitude of the direct current which should be output by the main circuit according to the comparison result output by the comparing unit and outputs a judgment result;

and the input end of the operation unit is connected with the output end of the judgment unit, and the operation unit calculates the conduction width of the insulated gate bipolar transistor corresponding to the direct current which should be output by the main circuit according to the judgment result output by the judgment unit.

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