Arc starting method for argon arc welding machine and argon arc welding machine using the method

Abstract

At least one embodiment of the present disclosure provides an arc starting method for a argon arc welding machine, the argon arc welding machine includes a power supply, the method includes: monitoring the output current of the power supply; generating a voltage signal according to the output current; determining the previous welding time and the time interval between the current arc starting and the end of the previous welding according to the voltage pulse; and determining the current arc starting time and the current arc starting current according to the previous welding time, the previous welding current and the time interval. A argon arc welding machine using the arc starting method is also provided.

Description

Technical Field

[0001] The present disclosure relates to the field of electric welding, and more specifically, to an arc starting method for a argon arc welding machine and a argon arc welding machine using the method. Background Art

[0002] Argon arc welding machine is a machine that uses argon arc welding, which adopts the arc starting method of high-voltage breakdown. Argon arc welding, that is, tungsten inert gas shielded arc welding, uses industrial tungsten or active tungsten as an infusible electrode, inert gas (argon) as protection, and uses high current to melt the welding material into a liquid on the welded substrate to form a molten pool, so that the parent material and the solder can achieve metallurgical bonding. A welding technology, referred to as TIG. Because argon is continuously supplied during high-temperature molten welding, the solder cannot contact the oxygen in the air, thereby preventing the oxidation of the parent material and the solder. Therefore, it can be used for welding Al, Mg, Ti and their alloys and stainless steel. It is generally used for welding thin plates of 6 to 10 mm and single-sided welding and double-sided forming of thick plates. It has irreplaceable advantages. The argon arc welding arc burns stably, the heat is concentrated, the arc column temperature is high, the welding production efficiency is high, the heat-affected zone is narrow, and the welded weldment has little stress, deformation, and crack tendency.

[0003] However, argon arc welding also has disadvantages such as high work requirements and low work efficiency. The tungsten electrode used in argon arc welding will be consumed under the condition of frequent high-current and high-frequency arc initiation. Especially in AC argon arc welding, negative current is generally used for arc initiation, which requires a long time to heat the tungsten electrode, making the molten ball at the end of the tungsten electrode larger. The arc spots on the surface of the molten ball are easily disturbed by external factors and move, causing the arc to drift and become unstable, and even the tungsten electrode is partially melted and falls into the molten pool, affecting the welding quality. At the same time, due to the consumption of the tungsten electrode, the tungsten electrode needs to be replaced or ground regularly, which is an important factor leading to the low efficiency of argon arc welding. Summary of the invention

[0004] In order to reduce the consumption of tungsten electrode and improve the working efficiency of argon arc welding, the present disclosure provides an arc starting method for an argon arc welding machine and an argon arc welding machine using the method.

[0005] At least one embodiment of the present disclosure provides an arc starting method for a argon arc welding machine, the argon arc welding machine comprising a power supply, the method comprising:

[0006] monitoring an output current of the power supply;

[0007] generating a voltage signal according to the output current;

[0008] Determine the last welding time and the time interval between the current arc initiation and the end of the last welding according to the voltage signal; and

[0009] The current arc striking time and the current arc striking current are determined according to the previous welding time, the previous welding current and the time interval.

[0010] In one embodiment of the present disclosure, determining the previous welding time according to the voltage pulse includes:

[0011] generating a first voltage signal when the power supply starts to output current;

[0012] generating a second voltage signal when the power supply stops outputting current; and

[0013] The previous welding time is determined according to the time difference between the generation of the first voltage signal and the second voltage signal.

[0014] In one embodiment of the present disclosure, determining the time interval between the current arc initiation and the end of the previous welding according to the voltage signal includes:

[0015] generating a second voltage signal when the power supply stops outputting current;

[0016] generating a third voltage signal during the current arc ignition; and

[0017] The time interval between the end of the previous welding and the current arc initiation is determined according to the time difference between the generation of the second voltage signal and the third voltage signal.

[0018] In one embodiment of the present disclosure, the arc striking method further comprises:

[0019] receiving externally set welding parameters, the welding parameters including welding voltage, welding current, and a diameter of a tungsten electrode connected to a negative pole of a power source; and

[0020] Determine the standard arc striking time and standard arc striking current according to the welding parameters;

[0021] Wherein, determining the current arc striking time and the current arc striking current according to the previous welding time, the previous welding current and the time interval comprises:

[0022] When the previous welding time is long, the welding current is large, and the interval between this arc ignition and the previous welding is short, a time and current smaller than the standard arc ignition time and the standard arc ignition current are determined as the current arc ignition time and the current.

[0023] In one embodiment of the present disclosure, the arc striking method further comprises:

[0024] receiving externally set welding parameters, the welding parameters including welding voltage, welding current, and a diameter of a tungsten electrode connected to a negative pole of a power source; and

[0025] Determine the standard arc striking time and standard arc striking current according to the welding parameters;

[0026] Wherein, determining the current arc striking time and the current arc striking current according to the previous welding time, the previous welding current and the time interval comprises:

[0027] When the previous welding time is short, or the previous welding current is large and the time interval between this arc ignition and the previous welding is long, the time and current equivalent to the standard arc ignition time and the standard arc ignition current are determined as the current arc ignition time and the current.

[0028] In one embodiment of the present disclosure, the arc striking method further includes, after determining the current arc striking time and the current arc striking current, the power supply outputting the current arc striking current within the current arc striking time to strike the arc.

[0029] At least one embodiment of the present disclosure further provides a argon arc welding machine, including a power supply, and further comprising:

[0030] a feedback unit configured to monitor the output current of the power supply and generate a pulse voltage when the output current changes;

[0031] The control unit is configured to receive the pulse voltage from the feedback unit, determine the previous welding time and the time interval between the current arc initiation and the end of the previous welding according to the pulse voltage, and determine the current arc initiation time and the current arc initiation current according to the previous welding time, the previous welding machine current and the time interval.

[0032] In one embodiment of the present disclosure, the feedback unit includes a Hall sensor connected to an output terminal of the power supply and configured to generate the pulse voltage when the output current changes.

[0033] In one embodiment of the present disclosure, the control unit further includes a timing unit, which is configured to perform timing upon receiving the pulse voltage to determine the previous welding time and the time interval between the current arc initiation and the end of the previous welding.

[0034] In one embodiment of the present disclosure, the argon arc welding machine also includes a setting unit, which is configured to receive welding parameters input from the outside, and the welding parameters include welding voltage, welding current, and the diameter of a tungsten electrode connected to the negative pole of a power supply; wherein the control unit receives the welding parameters from the setting unit, and determines a standard arc starting time and a standard arc starting current according to the welding parameters.

[0035] In one embodiment of the present disclosure, the control unit is also configured to determine a time and current that are smaller than the standard arc ignition time and the standard arc ignition current as the current arc ignition time and the current arc ignition current when the previous welding time is long, the welding current is large, and the interval between this arc ignition and the previous welding is short.

[0036] In one embodiment of the present disclosure, the control unit is also configured to determine a time and current equivalent to the standard arc ignition time and the standard arc ignition current as the current arc ignition time and the current arc ignition current when the previous welding time is short, or the previous welding current is large and the time interval between this arc ignition and the previous welding is long.

[0037] In one embodiment of the present disclosure, the argon arc welding machine also includes a driving unit, which is configured to receive the current arc starting time and the current arc starting current from the control unit, and drive the power supply to start the arc within the current arc starting time and with the current arc starting current according to the current arc starting time.

[0038] In the welding arc starting method according to the embodiment of the present disclosure and the argon arc welding machine using the arc starting method, the previous welding time, the previous welding current and the time interval from the end of the previous welding to the current arc starting can be determined by monitoring the output current of the power supply. When the previous welding time is long, the previous welding current is large, and the time interval from the end of the previous welding to the current arc starting is small, arc starting is performed with an arc starting time and an arc starting current that are smaller than the standard arc starting time and the standard arc starting current. When the previous welding time is short, or the previous welding current is small, and the time interval from the end of the previous welding to the current arc starting is large, arc starting is performed with an arc starting current and an arc starting time that are equivalent to or larger than the standard arc starting time and the standard arc starting current. This ensures the arc starting success rate while reducing tungsten electrode consumption and improves the working efficiency of the welding machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A flow chart of an arc starting method for a argon arc welding machine according to an embodiment of the present disclosure is shown;

[0040] Figure 2 A flow chart of determining the previous welding time in an arc starting method for a argon arc welding machine according to an embodiment of the present disclosure is shown;

[0041] Figure 3 A flow chart of determining the time interval between the end of the previous welding and the current arc ignition in an arc ignition method for a argon arc welding machine according to an embodiment of the present disclosure is shown;

[0042] Figure 4 A flow chart of an arc starting method for a argon arc welding machine according to another embodiment of the present disclosure is shown;

[0043] Figure 5 A structural block diagram of a argon arc welding machine according to an embodiment of the present disclosure is shown; and

[0044] Figure 6 A structural block diagram of a argon arc welding machine according to another embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0045] The present application is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present application will become clearer and more specific.

[0046] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0047] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0048] TIG welding (Tungsten Inert Gas Welding), also known as non-melting inert gas shielded arc welding. Whether it is manual welding or automatic welding of 0.5-4.0mm thick stainless steel, TIG welding is the most commonly used welding method. During the welding process, the workpiece is connected to the positive pole of the power supply, and the tungsten electrode in the welding torch is used as the negative pole. The inert gas is generally argon.

[0049] The traditional argon arc welding arc burns between the non-melting electrode (usually tungsten electrode) and the base material, and an inert gas (usually argon gas) that does not react chemically with the metal flows around the welding arc to form a protective gas cover, which prevents the tungsten electrode tip, arc, molten pool and metal at high temperature from contacting the air, preventing oxidation and absorption of harmful gases. Thus, a dense welded joint is formed with very good mechanical properties.

[0050] The argon arc welding machine usually includes a power supply, a setting unit, a control unit, and a driving unit. When the welding preparation begins, the setting unit receives the welding voltage and welding current for welding input from the outside. The control unit determines the arc starting current and arc starting time according to the welding voltage and the welding current to ensure successful arc starting, and sends the arc starting current, the arc starting time and the welding current to the driving unit. The driving unit drives the power supply to input the arc starting current within the arc starting time according to the arc starting current and the arc starting time to form an arc (also called arc starting). The formed arc is used to melt the solder, form a weld pool, and perform welding. At the end of welding, the driving unit drives the power supply to extinguish the arc. At the next welding, if the welding voltage and welding current have not changed, the above process is repeated to start the arc and perform welding.

[0051] The argon arc welding machine uses a negative output mode. The output negative pole is connected to the electrode needle, and the positive pole is connected to the workpiece. At the beginning of welding, an arc is formed between the tungsten electrode and the base material. The process of forming an arc is called arc initiation. In the actual welding process, high current and high frequency arc initiation are frequently used. In this case, the tungsten electrode will be heated for a long time, the welding quality will be affected, and the tungsten electrode needs to be replaced or ground, resulting in low efficiency of the argon arc welding machine.

[0052] To this end, an embodiment of the present disclosure provides an arc striking control method, which can dynamically adjust the arc striking current and arc striking time when the argon arc welding machine is restarted according to the working condition of the argon arc welding machine, which is beneficial to improving the arc striking success rate and effectively reducing the consumption of tungsten electrode, thereby improving welding efficiency and ensuring normal welding.

[0053] At least one embodiment of the present disclosure provides a welding arc initiation method, such as Figure 1 As shown, the welding control method is applicable to a welding machine including a power supply, and the method includes: S1, monitoring the output current of the power supply; S2, generating a voltage signal according to the output current; S3, determining the previous welding time and the time interval between the current arc initiation and the end of the previous welding according to the voltage signal; S4, determining the current arc initiation time and the current arc initiation current according to the previous welding time, the previous welding current and the time interval.

[0054] The output end of the power supply of the welding machine is connected to a Hall sensor, which generates an output voltage signal when an alternating magnetic field passes through it. When the power supply starts to output current (i.e., arc pulse), the current flows through the Hall sensor, and at this time, a voltage signal is generated in the Hall sensor. The magnitude of the welding current can be determined based on the magnitude of the voltage signal. When the power supply stops outputting current (i.e., welding ends), another voltage signal is generated in the Hall sensor. By determining the time interval between the two voltage signals, the previous welding time can be obtained.

[0055] In one embodiment of the present disclosure, Figure 2 As shown, the method also includes: S11, generating a first voltage signal when the power supply starts to output current; S12, generating a second voltage signal when the power supply stops outputting current; and S13, determining the previous welding time based on the time difference between generating the first voltage signal and the second voltage signal.

[0056] In one embodiment of the present disclosure, Figure 3 As shown, the method also includes: S12, generating a second voltage signal when the power supply stops outputting current; S101, generating a third voltage signal during the current arc initiation; and S102, determining the time interval between the end of the previous welding and the current arc initiation based on the time difference between the generation of the second voltage signal and the third voltage signal.

[0057] According to the current output characteristics of welding, the current starts to be output when the arc is struck, stops when the arc is extinguished, and outputs the current again when the arc is started next time. Since the output end of the power supply is connected to a Hall sensor, a voltage signal will be generated in the Hall sensor when the current passes through, and the magnitude of the voltage signal is proportional to the magnitude of the current flowing through the Hall sensor. Therefore, by setting the Hall sensor, the start time of the previous arc strike, the end time of the previous arc extinguishing, and the start time of this arc strike can be determined, thereby determining the previous welding time and the time interval between the end of the previous welding and the current arc strike.

[0058] When the current welding needs to be struck, the tungsten electrode will be in different states due to the difference in the previous welding time, the previous welding current and the time interval between the two weldings. For example, if the previous welding time is long, the previous welding current is large, and the time interval between the two weldings is short, the tungsten electrode is at a higher temperature. At this time, the arc is struck with an arc current and arc time that are much smaller than the standard arc current and the standard arc time, and there is also a high arc striking success rate. If the previous welding time is short, or the previous welding current is small, or the time interval between the two weldings is long, the tungsten electrode is at a lower temperature. At this time, the arc is struck with an arc current and arc time determined according to the welding parameters, or with an arc current or arc time that is larger than the standard arc current and the standard arc time, which helps to improve the arc striking success rate and ensure the normal progress of welding. The standard arc striking current and the standard arc striking time are determined according to the welding parameters. Before welding starts, the welding parameters can be set on the welding machine, and the welding parameters include welding voltage and welding current. According to the set welding voltage and welding current, the standard arc striking time and standard arc striking current for arc striking are determined.

[0059] In one embodiment of the present disclosure, Figure 4 As shown, before monitoring the output current of the power supply, the method further includes: S0, receiving externally set welding parameters.

[0060] The welding machine can determine the welding current and welding voltage according to the externally set welding parameters, and can also determine the standard arc striking current and standard arc striking time for arc striking.

[0061] In one embodiment of the present disclosure, determining the current arc starting time and the current arc starting current includes: when the previous welding time is long, the previous welding current is large, and the time interval between the two weldings is short, using a current and time that are smaller than the standard arc starting current and the standard arc starting time as the current arc starting current and the current arc starting time.

[0062] In one embodiment of the present disclosure, the method includes: when the previous welding time is short, the previous welding current is small, or the time interval between the two weldings is long, the time and current that are equivalent to or greater than the standard arc starting current and the standard arc starting time are used as the current arc starting time and the current arc starting current.

[0063] By determining the last welding time, the last welding current and the time interval from the end of the last welding to the current arc starting, the state of the tungsten electrode can be determined, and then the current arc starting current and the current arc starting time can be dynamically adjusted according to the state of the tungsten electrode to reduce tungsten electrode consumption.

[0064] After the arc striking time and the arc striking current are determined, the power supply outputs the arc striking current within the arc striking time to strike the arc.

[0065] In the welding arc starting method according to the embodiment of the present disclosure, the previous welding time, the previous welding current and the time interval from the end of the previous welding to the current arc starting can be determined by monitoring the output current of the power supply. When the previous welding time is long, the previous welding current is large and the time interval from the end of the previous welding to the current arc starting is short, arc starting is performed with an arc starting time and an arc starting current that are smaller than the standard arc starting time and the standard arc starting current. When the previous welding time is short, or the previous welding current is small, and the time interval from the end of the previous welding to the current arc starting is large, arc starting is performed with an arc starting current and an arc starting time that are equivalent to or larger than the standard arc starting time and the standard arc starting current. This ensures the arc starting success rate while reducing tungsten electrode consumption and improves the working efficiency of the welding machine.

[0066] According to at least one embodiment of the present disclosure, a argon arc welding machine is provided. Figure 5As shown, the argon arc welding machine includes a power supply, a control unit and a feedback unit. The argon arc welding machine also includes a feedback unit, the feedback unit is configured to monitor the output current of the power supply and generate a feedback signal, the control unit is configured to determine the time interval between the current arc striking time point and the previous arc extinguishing time point according to the feedback signal, and determine the current arc striking time and arc striking current according to the time interval, the previous welding current and the welding duration.

[0067] The feedback unit includes a Hall sensor connected to the output end of the power supply. The Hall sensor is a sensor that generates an output voltage signal when an alternating magnetic field passes through. When the welder starts to strike an arc, the power supply outputs a current (i.e., an arc striking pulse), and the current passes through the Hall sensor and is output from the output end of the power supply. Due to the passage of the current, a first voltage signal is generated in the Hall sensor, and the first voltage signal is sent to the feedback unit. After receiving the first voltage signal, the feedback unit determines the magnitude of the current based on the first voltage signal and generates a first current feedback signal, and the first current feedback signal indicates the magnitude of the pulse current. The feedback unit sends the first current feedback signal to the control unit, and the control unit records the time when the current feedback signal is received.

[0068] At the end of arc closure, the power supply stops outputting current. At this time, no current passes through the Hall sensor, the Hall sensor will no longer generate a voltage signal, and the feedback unit will no longer receive a voltage signal from the Hall sensor. At this time, the feedback unit will generate a no-current feedback signal and send the no-current feedback signal to the control unit. The control unit records the time when the no-current feedback signal is received. At this time, the control unit can determine the previous welding time based on the time when the current feedback signal is received and the time when the no-current feedback is received.

[0069] The welding machine also includes a setting unit. Figure 6 As shown, the setting unit is connected to the control unit. The setting unit is configured to receive welding parameters input from the outside and send the welding parameters to the control unit.

[0070] The setting unit receives the welding parameters input by the user and sends the welding parameters to the control unit. For example, the welding parameters include welding voltage, welding current and the diameter of the tungsten electrode. The control unit determines arc striking parameters and welding parameters based on the welding parameters to ensure the arc striking success rate. The arc striking parameters include arc striking time and arc striking current, and the arc striking parameters are related to the diameter of the tungsten electrode. The welding parameters include welding voltage and welding current. The welding voltage refers to the voltage output by the power supply during welding, and the welding current refers to the current output by the power supply during welding.

[0071] like Figure 6 As shown, the welding machine further includes a driving unit, which is configured to receive the arc striking parameters from the control unit and drive the power supply output according to the arc striking parameters. For example, after determining the welding parameters, the control unit sends the welding parameters to the driving unit. The driving unit drives the power supply to output the arc striking current within the arc striking time according to the received welding parameters to ensure the arc striking success rate and ensure the normal progress of welding.

[0072] After a period of welding, the welding machine extinguishes the arc and no longer outputs welding pulses. At this time, when the welding machine is needed to work again, after pressing the welding switch, the driving unit controls the power supply to output the arc striking pulse within the arc striking time. The control unit determines the time interval between the start time of this arc striking and the end time of the previous arc closing according to the time point of outputting the arc striking pulse, and determines the arc striking time and arc striking current according to the recorded current duration and pulse current size. The control unit sends the determined arc striking time and arc striking current to the driving unit, and the driving unit drives the power supply output according to the arc striking time and arc striking current.

[0073] The meaning of the driving unit driving the power supply to output according to the current arc striking time and the current arc striking current is that the driving unit drives the power supply to output the current arc striking current within the current arc striking time to strike an arc.

[0074] If the previous welding time is long and the welding current is large, the tungsten electrode absorbs more energy and the temperature is high. If the interval between this welding and the previous welding is short, the tungsten electrode is still at a high temperature. If the arc is struck at this time, the energy required is low and the arc can be struck with a lower arc striking current and arc striking time. For example, the arc can be struck with an arc striking current and arc striking time that are much smaller than the arc striking current and arc striking time in the previous arc striking stage.

[0075] If the previous welding time is short, or the welding current is small, the heating time of the tungsten electrode in the previous welding is short or the heating heat is small, the temperature of the tungsten electrode will be relatively low during the current arc starting, and the required energy will be higher. It is necessary to start the arc with the current arc starting current and the current arc starting time that are equal to or even larger than the previous arc starting time and the previous arc starting current, so as to improve the arc starting success rate and ensure the normal progress of welding.

[0076] In one embodiment of the present disclosure, the control unit includes a timing unit, which is configured to start timing when the control unit receives the current feedback signal and end timing when the control unit receives the no-current feedback signal to determine the previous welding time.

[0077] The timing unit is also configured to start timing when the control unit receives the no-current feedback signal, and end timing when the control unit receives the current feedback signal from the feedback unit again, so as to determine the welding time interval between this welding and the previous welding.

[0078] In one embodiment of the present disclosure, the control unit is configured to control the driving unit to drive the power supply to strike an arc with a current arc striking time and a current arc striking current that are significantly smaller than the previous arc striking time and the previous arc striking current when the welding time interval is short and the welding current is large.

[0079] The current arc ignition time is significantly smaller than the previous arc ignition time, which means that the current arc ignition time is at most a fraction of the previous arc ignition time. For example, the current arc ignition time may be half, one third, or even smaller than the previous arc ignition time.

[0080] In one embodiment of the present disclosure, the control unit is configured to control the driving unit to drive the power supply to strike an arc with a current arc striking time and a current arc striking current that are equivalent to or greater than a previous arc striking time and a previous arc striking current when the welding time interval is large or the welding current is small.

[0081] The current arc ignition time is equivalent to the previous arc ignition time, which means that the current arc ignition time is similar to the previous arc ignition time, and the difference between the two is less than a threshold value. For example, the current arc ignition time can be equal to the previous arc ignition time, or greater than the previous arc ignition time, and the difference between the two is less than a threshold value, or smaller than the previous arc ignition time, and the difference between the two is less than a threshold value.

[0082] The current arc-starting current is equivalent to the previous arc-starting current, which means that the current arc-starting current is similar to the previous arc-starting current, and the difference between the two is less than a threshold value. For example, the current arc-starting current can be equal to the previous arc-starting current, or larger than the previous arc-starting current, and the difference between the two is less than a threshold value, or smaller than the previous arc-starting current, and the difference between the two is less than a threshold value.

[0083] In the argon arc welding machine according to the embodiment of the present disclosure, by monitoring the time of the previous welding and the time interval between the previous welding and the current arc striking, the arc striking current and arc striking time are adjusted. This can effectively reduce the loss of tungsten electrode and improve the working efficiency of the argon arc welding machine while improving the arc striking success rate and ensuring normal welding.

[0084] In the description of the present application, it should be noted that the terms "upper", "lower", "inside", "outside", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships in the working state of the present application. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.

[0085] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect" and "connect" should be understood in a broad sense. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0086] The present application has been described above in conjunction with preferred embodiments, but these embodiments are only exemplary and serve only as an illustration. On this basis, various replacements and improvements may be made to the present application, all of which fall within the scope of protection of the present application.

Claims

1. An arc starting method for a argon arc welding machine, the argon arc welding machine comprising a power supply, the method comprising: monitoring an output current of the power supply; generating a voltage signal according to the output current; Determine the last welding time and the time interval between the current arc initiation and the end of the last welding according to the voltage signal; as well as Determine the current arc striking time and the current arc striking current according to the previous welding time, the previous welding current and the time interval; Among them, it also includes: receiving externally set welding parameters, the welding parameters including welding voltage, welding current, and a diameter of a tungsten electrode connected to a negative pole of a power source; and Determining a standard arc striking time and a standard arc striking current according to the welding parameters; Wherein, determining the current arc striking time and the current arc striking current according to the previous welding time, the previous welding current and the time interval comprises: When the previous welding time is long, the welding current is large, and the interval between this arc ignition and the previous welding is short, a time and current smaller than the standard arc ignition time and the standard arc ignition current are determined as the current arc ignition time and the current.

2. The arc striking method according to claim 1, wherein: Determining the previous welding time according to the voltage signal comprises: generating a first voltage signal when the power supply starts to output current; generating a second voltage signal when the power supply stops outputting current; and The previous welding time is determined according to the time difference between the generation of the first voltage signal and the second voltage signal.

3. The arc striking method according to claim 1, wherein: Determining the time interval between the current arc initiation and the end of the previous welding according to the voltage signal includes: generating a second voltage signal when the power supply stops outputting current; generating a third voltage signal during the current arc ignition; and The time interval between the end of the previous welding and the current arc initiation is determined according to the time difference between the generation of the second voltage signal and the third voltage signal.

4. The method according to claim 1, further comprising: When the previous welding time is short, the previous welding current is small, or the time interval between this arc ignition and the previous welding is long, the time and current equivalent to the standard arc ignition time and the standard arc ignition current are determined as the current arc ignition time and the current arc ignition current.

5. The method according to claim 1 or 4, wherein: After determining the current arc striking time and the current arc striking current, the power supply outputs the current arc striking current within the current arc striking time to strike the arc.

6. A argon arc welding machine, comprising a power source, and further comprising: a feedback unit configured to monitor the output current of the power supply and generate a pulse voltage when the output current changes; A control unit configured to receive the pulse voltage from the feedback unit, determine the previous welding time and the time interval between the current arc initiation and the end of the previous welding according to the pulse voltage, and determine the current arc initiation time and the current arc initiation current according to the previous welding time, the previous welding machine current and the time interval; It also includes a setting unit configured to receive externally input welding parameters, wherein the welding parameters include welding voltage, welding current, and a diameter of a tungsten electrode connected to a negative pole of a power source; Wherein, the control unit receives the welding parameters from the setting unit, and determines a standard arc starting time and a standard arc starting current according to the welding parameters; In which, the control unit is also configured to determine a time and current that are smaller than the standard arc ignition time and the standard arc ignition current as the current arc ignition time and the current arc ignition current when the previous welding time is long, the welding current is large, and the interval between this arc ignition and the previous welding is short.

7. The argon arc welding machine according to claim 6, wherein: The feedback unit includes a Hall sensor connected to an output terminal of the power supply and configured to generate the pulse voltage when the output current changes.

8. The argon arc welding machine according to claim 6, wherein: The control unit further comprises a timing unit, which is configured to perform timing upon receiving the pulse voltage, and determine the previous welding time and the time interval between the current arc initiation and the end of the previous welding.

9. The argon arc welding machine according to claim 6, wherein: The control unit is also configured to determine a time and current equivalent to the standard arc starting time and the standard arc starting current as the current arc starting time and the current arc starting current when the previous welding time is short, the previous welding current is small, or the time interval between the current arc starting and the previous welding is long.

10. The argon arc welding machine according to claim 6 or 9, further comprising a driving unit, wherein the driving unit is configured to receive a current arc striking time and a current arc striking current from the control unit, and drive the power supply to strike an arc within the current arc striking time and with the current arc striking current according to the current arc striking time and the current arc striking current.

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