Pulse control method for welding machine and welding machine

Abstract

At least one embodiment of the present disclosure provides a pulse control method for a welding machine, including: determining whether a difference between an inductance of a welding circuit and an inductance of a welding line is greater than a first threshold; and when the difference between the inductance of the welding circuit and the inductance of the welding line is greater than the first threshold, adjusting the second pulse according to an effective value of the energy of the first pulse to obtain an adjusted pulse, where the first pulse represents a standard pulse output in a normal welding state, and the second pulse represents a currently output pulse. A welding machine is also disclosed. In the pulse control method for a welding machine and the welding machine according to an embodiment of the present disclosure, when a relatively large inductance is introduced into the welding circuit, the effective energy value of the output pulse is adjusted, and various welding defects can be effectively eliminated.

Description

Technical Field

[0001] The present disclosure relates to the field of welding technology, and more particularly, to a pulse control method for a welding machine and a welding machine. Background Art

[0002] With the development of welding technology, the technology of gas metal arc welding has become more and more mature and is more and more widely used in actual welding operations. The pulsed welding method is widely used in welding operations in different industries because it is easy to operate and has less spatter. In actual welding, due to the differences in welding conditions, the base metal wire in the circuit, that is, the grounding wire, may be relatively long. If the wiring is improper or affected by the construction site, a large inductance may be generated in the circuit. During welding operation, a large part of the energy will be consumed in the circuit, resulting in insufficient short energy of the arc output, abnormal welding, and large welding defects. Summary of the Invention

[0003] In view of the above technical problems, at least one embodiment of the present disclosure provides a pulse control method for a welding machine and a welding machine.

[0004] At least one embodiment of the present disclosure provides a pulse control method for a welding machine, including:

[0005] Determining whether the difference between the welding loop inductance and the welding line inductance is greater than a first threshold; and

[0006] When the difference between the welding loop inductance and the welding line inductance is greater than the first threshold, adjusting the second pulse according to the effective value of the energy of the first pulse to obtain an adjusted pulse, where the first pulse represents a standard pulse output in a normal welding state, and the second pulse represents the currently output pulse.

[0007] In one embodiment of the present disclosure, determining whether the difference between the welding loop inductance and the welding circuit inductance is greater than the first threshold includes:

[0008] Real-time measuring the rise time of the second pulse; and

[0009] When the increase in the rise time of the second pulse relative to the rise time of the first pulse exceeds a second threshold, determining that the difference between the welding loop inductance and the welding line inductance is greater than the first threshold.

[0010] In one embodiment of the present disclosure, determining whether the difference between the welding loop inductance and the welding circuit inductance is greater than the first threshold includes:

[0011] Real-time measuring the peak duration of the second pulse; and

[0012] In the case where the difference between the peak duration of the second pulse and the peak duration of the first pulse exceeds a third threshold, it is determined that the difference between the welding loop inductance and the welding line inductance is greater than a first threshold.

[0013] In one embodiment of the present disclosure, determining whether the difference between the welding loop inductance and the welding line inductance is greater than a first threshold includes:

[0014] Measuring the fall time of the second pulse in real time; and,

[0015] In the case where the difference between the fall time of the second pulse and the fall time of the first pulse exceeds a fourth threshold, it is determined that the welding loop inductance has increased by a first threshold relative to the welding line inductance.

[0016] In one embodiment of the present disclosure, adjusting the first pulse to obtain an adjusted pulse such that the effective energy value of the adjusted pulse is equal to the effective energy value of the second pulse includes:

[0017] Determining a first effective energy value of the first pulse and a second effective energy value of the second pulse; and

[0018] Adjusting at least one of the peak current, peak duration, and base current of the first pulse according to the deviation between the first effective energy value and the second effective energy value, so that the effective energy value of the adjusted pulse is equal to the effective energy value of the second pulse.

[0019] In one embodiment of the present disclosure, the welding method further includes: determining the pulse parameters of the first pulse according to the voltage and current for welding input externally.

[0020] In one embodiment of the present disclosure, the welding method further includes determining the first threshold according to the welding requirements.

[0021] In one embodiment of the present disclosure, the welding method further includes outputting a pulse for welding according to the pulse parameters of the adjusted pulse.

[0022] At least one embodiment of the present disclosure provides a welding machine, including a power supply, and further including:

[0023] A setting unit configured to receive welding parameters input externally;

[0024] A control unit configured to determine the pulse parameters of the first pulse according to the welding parameters, where the first pulse represents a standard pulse corresponding to the welding parameters; and

[0025] A driving unit configured to drive the power supply to output a second pulse according to the pulse parameters of the first pulse;

[0026] Wherein, the control unit is further configured to determine whether the difference between the welding loop inductance and the welding line inductance is greater than a first threshold, and adjust the second pulse based on the effective energy value of the first pulse to obtain an adjusted pulse when the difference between the welding loop inductance and the welding line inductance is greater than the first threshold.

[0027] In an embodiment of the present disclosure, the welding machine further includes: a sampling unit configured to sample the second pulse output by the power supply, determine the pulse parameters of the second pulse, and send the pulse parameters of the second pulse to the control unit.

[0028] In an embodiment of the present disclosure, the parameters for which the sampling unit samples the second pulse include the rise time, the peak current duration, and the fall time.

[0029] In an embodiment of the present disclosure, the control unit compares the pulse parameters of the second pulse with the pulse parameters of the first pulse to determine whether the difference between the welding loop inductance and the welding line inductance is greater than a first threshold.

[0030] In an embodiment of the present disclosure, the control unit compares the pulse parameters of the second pulse with the pulse parameters of the first pulse to determine whether the difference between the welding loop inductance and the welding line inductance is greater than a first threshold, including:

[0031] In at least one of the following cases, it is determined that the difference between the welding loop inductance and the welding line inductance is greater than the first threshold:

[0032] The difference between the rise time of the first pulse and the rise time of the second pulse is greater than a second threshold;

[0033] The difference between the peak duration of the first pulse and the peak duration of the second pulse is greater than a third threshold; and

[0034] The difference between the fall time of the first pulse and the fall time of the second pulse is greater than a fourth threshold.

[0035] In an embodiment of the present disclosure, the control unit is further configured to: when the difference between the welding loop inductance and the welding line inductance is greater than the first threshold, adjust the waveform parameters of the first pulse based on the difference between the effective energy value of the first pulse and the effective energy value of the second pulse to generate an adjusted pulse.

[0036] In one embodiment of the present disclosure, the waveform parameters of the first pulse include at least one of the base current, peak current, and peak duration of the first pulse, and the effective energy value of the adjustment pulse is equal to the effective energy value of the first pulse.

[0037] In one embodiment of the present disclosure, the control unit sends the pulse parameters of the adjustment pulse to the drive unit, and the drive unit drives the power supply to output the adjustment pulse according to the pulse parameters of the adjustment pulse.

[0038] In one embodiment of the present disclosure, the first threshold is determined according to welding requirements.

[0039] In the pulse control method and the welding machine according to the embodiments of the present disclosure, by determining the difference between the waveform parameters of the currently output pulse and the waveform parameters of the standard pulse, it is determined that a relatively large inductance is introduced into the welding circuit. Furthermore, by adjusting the effective energy value of the output pulse, welding defects caused by weak output energy are reduced, and the welding quality is improved. Description of the Drawings

[0040] Figure 1 Shows the pulse waveform output according to the pulse command of the built-in expert data in the normal welding state.

[0041] Figure 2 Shows the influence of the inductance of the welding circuit on the pulse parameters of the output pulse.

[0042] Figure 3 Shows the flowchart of the pulse control method for a welding machine according to one embodiment of the present disclosure.

[0043] Figure 4 Shows the flowchart of the pulse control method for a welding machine according to another embodiment of the present disclosure.

[0044] Figure 5 Shows the flowchart of determining whether the difference between the inductance of the welding circuit and the inductance of the welding circuit is greater than the first threshold according to one embodiment of the present disclosure.

[0045] Figure 6 Shows the flowchart of determining whether the difference between the inductance of the welding circuit and the inductance of the welding circuit is greater than the first threshold according to another embodiment of the present disclosure.

[0046] Figure 7 Shows the flowchart of determining whether the difference between the inductance of the welding circuit and the inductance of the welding circuit is greater than the first threshold according to still another embodiment of the present disclosure.

[0047] Figure 8 Shows the waveform comparison between the adjustment pulse and the second pulse according to one embodiment of the present disclosure.

[0048] Figure 9 Figure 1 schematically shows a waveform diagram of an adjustment pulse according to an embodiment of the present disclosure.

[0049] Figure 10 Figure 2 shows a schematic structural diagram of a welding machine according to an embodiment of the present disclosure. Detailed Embodiments

[0050] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. Through these descriptions, the features and advantages of the present application will become more clearly defined.

[0051] As used herein, the term "exemplary" means "serving as an example, embodiment, or illustration". Any embodiment described herein as "exemplary" is not necessarily to be construed as superior or better than other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0052] 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.

[0053] When the welding power supply leaves the factory, according to the different wire diameters of the welding wire and the shielding gas, expert data will be built in to ensure good welding effects. Figure 1 Figure 3 shows the pulse waveform output according to the built-in expert data in the normal welding state. The relatively important parameters in the pulse waveform include time parameters, slope parameters, and current parameters. As Figure 1 shown, the time parameters include the pulse rise time T1, the peak duration T2, and the pulse fall time T3, the slope parameters include the pulse rise slope ISL1 and the pulse fall slope ISL2, and the current parameters include the peak current and the base current. The normally output pulse waveform is the same as the standard pulse waveform.

[0054] The welding circuit refers to the current loop in the standard state, in which inductive devices such as transformers and inductors are provided. The line parameters of the welding circuit have inductance, and this inductance is called the line inductance. However, in the actual welding process, due to the relatively long welding loop (referring to the loop formed by the welding circuit, welding wire, base material, and ground, that is, the circuit loop during actual welding), and there may be bends and coils in the base material wire in the welding loop, or due to improper wiring of the welding loop, etc., the loop inductance in the welding loop will be larger than the line inductance of the welding circuit. Note that the welding circuit refers to the circuit inside the welding machine, and the welding loop refers to the loop formed by the welding machine, welding wire, base material, and ground. When the difference between the welding loop inductance and the welding circuit inductance is large, with the pulse command unchanged, the waveform of the actual output pulse will have a large change relative to the standard pulse waveform.

[0055] AsFigure 2 As shown, due to the presence of the inductance in the welding circuit, the pulse rising slope ISL1 and the pulse falling slope ISL2 are affected by the circuit inductance and decrease, resulting in an increase in both the pulse rising time T1 and the pulse falling time T3. When the pulse time remains unchanged, that is, from the start of the rise of the pulse base current to the peak current until the peak current drops to the base current again (T 13 , T 13 = T1 + T2 + T3), the increase in the pulse rising time T1 and the pulse falling time T3 means that the peak duration T2 of the pulse decreases. The length of the peak duration T2 of the pulse determines the magnitude of the arc output energy. The decrease in the peak duration T2 results in a reduction in the actually output energy.

[0056] In this way, since the inductance of the welding circuit varies greatly relative to the inductance of the welding line, during the pulsed welding operation of the melting electrode of the welding machine, the increase in the circuit inductance hinders the normal rise and fall of the pulse waveform. The peak duration of the pulse is short, which directly affects the output energy of the pulsed arc. A large part of the energy output by the welding power supply will be consumed in the circuit, and the energy output to the arc end is insufficient. The welding wire cannot be melted normally, affecting the normal formation of molten droplets, resulting in a large amount of spatter during the welding process. Moreover, there are welding quality problems such as poor post-weld forming, shallow penetration, and low cladding amount.

[0057] In response to this, the present disclosure provides a pulse control method to adjust the effective energy value of the output pulse when there is a large inductance in the circuit, so as to achieve a good welding effect.

[0058] At least one embodiment of the present disclosure provides a pulse control method for a welding machine, as Figure 3 shown, which includes: S10, determining whether the difference between the inductance of the welding circuit and the inductance of the welding line is greater than a first threshold; and S20, when the difference between the inductance of the welding circuit and the inductance of the welding line is greater than the first threshold, adjusting the second pulse according to the effective energy value of the first pulse to obtain an adjusted pulse, where the first pulse represents the standard pulse output under the normal welding state, and the second pulse represents the currently output pulse.

[0059] In an embodiment of the present disclosure, the method further includes S30, outputting a pulse according to the pulse parameters of the adjusted pulse for welding.

[0060] Figure 4 shows a pulse control method for a welding machine according to an embodiment of the present disclosure. As Figure 4As shown, the welding control method further includes S00. Before welding starts, the pulse welding mode is selected as needed, and the welding voltage and current are input. After the user selects the pulse welding mode, the welding machine power supply determines the parameters of the standard pulse for welding based on the user's selection or input, and sends the parameters of the standard pulse to the built-in expert system. The parameters of the standard pulse include the pulse rise time of the standard pulse or the peak duration of the standard pulse. When the wire feeding speed of the welding machine reaches the preset value, the welding machine power supply outputs a pulse according to the parameters of the standard pulse. At this time, the welding machine power supply collects the waveform of the second pulse (i.e., the currently output pulse) and determines the parameters of the second pulse. The parameters of the second pulse include the pulse rise time of the second pulse or the peak duration of the second pulse.

[0061] The inductor will impede the change of the pulsed current, which can slow down the current change. The slowdown of the current change will be reflected in the pulse waveform, and its rise time will increase. The change amount of the pulse rise time can be used to characterize the change of the welding loop inductance relative to the welding circuit inductance. Similarly, the change of the pulse fall time can also be used to characterize the change of the welding loop inductance relative to the welding circuit inductance.

[0062] When the pulse rise time of the second pulse (i.e., the currently output pulse) increases by a second time threshold relative to the rise time of the first pulse (i.e., the standard pulse), it corresponds to the welding loop inductance increasing by a first threshold relative to the welding line inductance. As Figure 5 shown, in an embodiment of the present disclosure, determining whether the difference between the welding loop inductance and the welding circuit inductance is greater than the first threshold includes: S101, measuring the rise time of the second pulse in real time; and S102, when the increase amount of the rise time of the second pulse relative to the rise time of the first pulse exceeds the second threshold, it can be determined that the difference between the welding loop inductance and the welding line inductance is greater than the first threshold.

[0063] During welding, the welding machine power supply outputs pulses according to the parameters of the standard pulse. Due to the presence of other inductors in the welding loop, when the pulse starts to rise or fall, the actually output pulse also starts to rise or fall. That is to say, the change amount of the peak duration of the pulse is the same as the change amount of the rise time of the pulse. In an embodiment of the present disclosure, as Figure 6 shown, determining whether the difference between the welding loop inductance and the welding circuit inductance is greater than the first threshold includes: S1001, measuring the peak duration of the second pulse in real time; and S1002, when the difference between the peak duration of the second pulse and the peak duration of the first pulse exceeds the third threshold, determining that the difference between the welding loop inductance and the welding line inductance is greater than the first threshold.

[0064] In one embodiment of the present disclosure, the waveform parameters of the first pulse are determined according to the externally set voltage and current for welding.

[0065] The increase in the welding loop inductance relative to the welding circuit inductance will also impede the change in the pulse current decline, making the pulse current decline time longer. The change amount of the pulse decline time can also be used to characterize the change in the welding loop inductance relative to the welding circuit inductance.

[0066] As Figure 7 shown, in one embodiment of the present disclosure, determining whether the difference between the welding loop inductance and the welding line inductance is greater than a first threshold includes: S10001, measuring the decline time of the second pulse in real time; and, S10002, when the increase amount of the decline time of the second pulse relative to the decline time of the first pulse exceeds a fourth threshold, determining that the welding loop inductance has increased by a first threshold relative to the welding line inductance.

[0067] In actual measurement, in order to reduce the influence of pulse fluctuations on the measurement results, the time when the current of the second pulse rises from IBA + 0.1*(IPA - IBA) to IBA + 0.9*(IPA - IBA) can be measured as the rise time of the second pulse, and the time when the current of the second pulse drops from IBA + 0.9*(IPA - IBA) to IBA + 0.1*(IPA - IBA) can be measured as the decline time of the second pulse. At the same time, the time when the current of the first pulse rises from IBA + 0.1*(IPA - IBA) to IBA + 0.9*(IPA - IBA) is used as the rise time of the first pulse, and the time when the current of the first pulse drops from IBA + 0.9*(IPA - IBA) to IBA + 0.1*(IPA - IBA) is used as the decline time of the first pulse.

[0068] When the difference between the welding loop inductance and the welding line inductance is greater than the first threshold, the second pulse is adjusted to ensure the welding quality.

[0069] In each welding, due to the different materials of the base material, the solder, the shape of the weld seam, and the requirements for welding quality, the influence of the inductance introduced by the welding loop on the welding result is different. Under different welding requirements, for the inductance introduced by the welding loop, the adjustment threshold is different. In one embodiment of the present disclosure, the first threshold is determined according to the welding requirements. Correspondingly, the second threshold, the third threshold, and the fourth threshold will all change with the change of the first threshold.

[0070] When a relatively large inductance is introduced into the welding loop, in order to compensate for the energy decline of the first pulse (the power output pulse), it is necessary to increase the effective energy value of the first pulse. As Figure 8As shown, in an embodiment of the present disclosure, obtaining an adjusted pulse by adjusting the first pulse so that the effective energy value of the adjusted pulse is equal to the effective energy value of the second pulse includes: S201, determining the first effective energy value of the first pulse and the second effective energy value of the second pulse; and S202, adjusting at least one of the peak current, peak duration, and base current of the first pulse according to the deviation between the first effective energy value and the second effective energy value, so that the effective energy value of the adjusted pulse is equal to the effective energy value of the second pulse.

[0071] The pulse waveform is divided into a rising stage, a peak duration stage, a falling stage, and a base duration stage, and the parameters of each stage have an impact on the effective energy value. In the present disclosure, the root mean square method is used to characterize the effective energy value of the pulse.

[0072] The second pulse corresponds to a standard pulse of the voltage and current set before welding, and its pulse waveform is built into the expert data. The effective energy value of the second pulse, that is, the effective energy value of the standard pulse output in the normal welding state, can be determined according to the root mean square method.

[0073] The first pulse corresponds to the pulse output by the welding machine when the welding circuit is formed (i.e., when welding starts). When there is a relatively large inductance in the welding circuit relative to the welding circuit, its rise time, fall time, peak duration, and base duration all change relative to the second pulse, which will cause the effective energy value of the first pulse to decrease relative to the effective energy value of the second pulse, and further cause the output short energy to decrease, resulting in welding defects.

[0074] Figure 9 The waveform diagram of the adjusted pulse is schematically shown, and the comparison between the adjusted pulse waveform and the first pulse waveform is shown. As Figure 9 shown, the peak current, base current, and peak duration of the adjusted pulse are all increased relative to the peak current, base current, and peak duration of the first pulse. In this way, the effective energy value of the adjusted pulse rises relative to the effective energy value of the first pulse. By adjusting the peak current, base current, and peak duration of the adjusted pulse, the effective energy value of the adjusted pulse can be made equal to the effective energy value of the second pulse. At this time, the output adjusted pulse eliminates the influence of the inductance in the welding circuit on the output pulse, so that the energy output by the arc meets the welding requirements and eliminates welding defects.

[0075] It should be noted that during the entire welding process, the output pulse only needs to be adjusted once. The output pulse is adjusted at the beginning of welding, and the parameters of the adjusted pulse are used for subsequent welding. In this way, it is possible to prevent the output pulse from being adjusted during the welding process, resulting in unstable welding arcs and welding defects.

[0076] At least one embodiment of the present disclosure further provides a welding machine 100, as Figure 10 shown, including a power supply 140, and further including: a setting unit 110 configured to receive welding parameters input externally; a control unit 120 configured to determine pulse parameters of a first pulse according to the welding parameters, where the first pulse represents a standard pulse corresponding to the welding parameters; a driving unit 130 configured to drive the power supply to output a second pulse according to the pulse parameters of the first pulse; wherein, the control unit 120 is further configured to determine whether a difference between a welding loop inductance and a welding line inductance is greater than a first threshold, and adjust the second pulse according to an effective value of energy of the first pulse to obtain an adjusted pulse when the difference between the welding loop inductance and the welding line inductance is greater than the first threshold.

[0077] The welding parameters include voltage and current for welding. After receiving the voltage and current for welding input externally, the setting unit 110 sends the voltage and the current to the control unit 120, and the control unit 120 determines pulse parameters of a standard pulse for welding according to the voltage and the current. The standard pulse for welding determined according to the voltage and the current is called the first pulse. The control unit 120 may determine the pulse parameters of the first pulse according to a preset algorithm according to the voltage and the current. The control unit 120 may also determine the pulse parameters of the first pulse based on expert data and according to the voltage and the current.

[0078] In an embodiment of the present disclosure, the welding machine 100 further includes a sampling unit 150, and the sampling unit 150 samples the second pulse output by the power supply 140, determines pulse parameters of the second pulse, and sends the pulse parameters of the second pulse to the control unit 120. The pulse parameters of the second pulse sampled by the sampling unit 150 include a rise time, a peak current duration, and a fall time. The control unit 120 compares the pulse parameters of the second pulse with the pulse parameters of the first pulse to determine whether the difference between the welding loop inductance and the welding line inductance is greater than the first threshold.

[0079] The pulse parameters of the first pulse and the pulse parameters of the second pulse both include a rise time, a peak current duration, and a fall time. The control unit 120 compares the pulse parameters of the second pulse with the pulse parameters of the first pulse to determine whether the difference between the welding loop inductance and the welding line inductance is greater than the first threshold, including:

[0080] When the difference between the rise time of the first pulse and the rise time of the second pulse is greater than a second threshold, or when the difference between the peak duration of the first pulse and the peak duration of the second pulse is greater than a third threshold, or when the difference between the fall time of the first pulse and the fall time of the second pulse is greater than a fourth threshold, it is determined that the difference between the inductance of the welding circuit and the inductance of the welding line is greater than the first threshold.

[0081] When the difference between the inductance of the welding circuit and the inductance of the welding line is greater than the first threshold, the control circuit 120 adjusts the waveform parameters of the first pulse based on the difference between the effective energy value of the first pulse and the effective energy value of the second pulse, and generates an adjustment pulse so that the effective energy value of the adjustment pulse is equal to the effective energy value of the first pulse.

[0082] As described in the method embodiment, the adjustment of the waveform parameters of the first pulse includes adjusting at least one of the base current, peak current, and peak duration of the first pulse to form an adjustment pulse so that the effective energy value of the adjustment pulse is equal to the effective energy value of the first pulse.

[0083] After the adjustment pulse is formed, the control unit 120 sends the pulse parameters of the adjustment pulse to the drive unit, and the drive unit drives the power supply to output the adjustment pulse according to the pulse parameters of the adjustment pulse.

[0084] Due to the different materials of the base material, solder material, weld shape, and welding quality requirements in each welding, the influence of the inductance introduced by the welding circuit on the welding result is different. Under different welding requirements, the output pulse will be adjusted only when different amounts of inductance are introduced into the welding circuit. That is to say, for different welding requirements, the first threshold is different.

[0085] It should be noted that during the entire welding process, the output pulse needs to be adjusted only once. The output pulse is adjusted at the beginning of welding, and then the parameters of the adjustment pulse are used for welding. In this way, it is possible to prevent the adjustment of the output pulse during welding, which may cause the welding arc to be unstable and generate welding defects.

[0086] Embodiments of the present disclosure provide a pulse control method for a welding machine and a welding machine. By determining whether the inductance introduced by the welding loop relative to the welding circuit is greater than a certain threshold, and adjusting the waveform of the output pulse when the inductance introduced by the welding loop relative to the welding circuit is greater than the threshold to generate an adjusted pulse, so that the effective energy value of the adjusted pulse is equal to the effective energy value of the standard pulse, and the effective energy of the arc is sufficient to normally melt the solder, the influence of the inductance introduced by the welding loop on the output energy of the output pulse is eliminated, and the welding quality is guaranteed.

[0087] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship in the working state of the present application. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0088] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0089] The above describes the present application in combination with preferred embodiments. However, these embodiments are exemplary only and only serve an illustrative purpose. On this basis, various substitutions and improvements can be made to the present application, and these all fall within the protection scope of the present application.

Claims

1. A pulse control method for a welding machine, comprising: Determining whether the difference between the welding circuit inductance and the welding line inductance is greater than a first threshold; And When the difference between the welding circuit inductance and the welding line inductance is greater than the first threshold, adjusting a second pulse according to the effective energy value of a first pulse to obtain an adjusted pulse, wherein the first pulse represents a standard pulse output in a normal welding state, and the second pulse represents the currently output pulse; Wherein, determining whether the difference between the welding circuit inductance and the welding circuit inductance is greater than the first threshold includes: Measuring the rise time of the second pulse in real time; and When the increase in the rise time of the second pulse relative to the rise time of the first pulse exceeds a second threshold, determining that the difference between the welding circuit inductance and the welding line inductance is greater than the first threshold; or Wherein, determining whether the difference between the welding circuit inductance and the welding circuit inductance is greater than the first threshold includes: Measuring the peak duration of the second pulse in real time; and When the difference between the peak duration of the second pulse and the peak duration of the first pulse exceeds a third threshold, determining that the difference between the welding circuit inductance and the welding line inductance is greater than the first threshold; or Wherein, determining whether the difference between the welding circuit inductance and the welding line inductance is greater than the first threshold includes: Measuring the fall time of the second pulse in real time; and When the difference between the fall time of the second pulse and the fall time of the first pulse exceeds a fourth threshold, determining that the welding circuit inductance has increased by the first threshold relative to the welding line inductance.

2. The pulse control method according to claim 1, wherein, Adjusting the first pulse to obtain an adjusted pulse such that the effective energy value of the adjusted pulse is equal to the effective energy value of the second pulse includes: Determining a first effective energy value of the first pulse and a second effective energy value of the second pulse; and Adjusting at least one of the peak current, peak duration, and base current of the first pulse according to the deviation between the first effective energy value and the second effective energy value such that the effective energy value of the adjusted pulse is equal to the effective energy value of the second pulse.

3. The pulse control method according to claim 1 further includes: Determining the pulse parameters of the first pulse according to the voltage and current for welding input externally.

4. The pulse control method according to claim 1, further comprising determining the first threshold according to welding requirements.

5. The pulse control method according to any one of claims 1 to 4, further comprising: Outputting a pulse for welding according to the pulse parameters of the adjusted pulse.

6. A welding machine, comprising a power supply, and further comprising: A setting unit configured to receive welding parameters input externally; A control unit configured to determine the pulse parameters of a first pulse according to the welding parameters, the first pulse representing a standard pulse corresponding to the welding parameters; And A driving unit configured to drive the power supply to output a second pulse according to the pulse parameters of the first pulse; Wherein, the control unit is further configured to determine whether the difference between the welding circuit inductance and the welding line inductance is greater than a first threshold, and when the difference between the welding circuit inductance and the welding line inductance is greater than the first threshold, adjusting the second pulse according to the effective energy value of the first pulse to obtain an adjusted pulse; The control unit is further configured to compare the pulse parameters of the second pulse with those of the first pulse to determine whether the difference between the inductance of the welding loop and the inductance of the welding line is greater than a first threshold value; The control unit is further configured to compare the pulse parameters of the second pulse with those of the first pulse to determine whether the difference between the inductance of the welding loop and the inductance of the welding line is greater than a first threshold value, including: Determining that the difference between the inductance of the welding loop and the inductance of the welding line is greater than the first threshold value in at least one of the following cases: The difference between the rise time of the first pulse and the rise time of the second pulse is greater than a second threshold value; The difference between the peak duration of the first pulse and the peak duration of the second pulse is greater than a third threshold value; and The difference between the fall time of the first pulse and the fall time of the second pulse is greater than a fourth threshold value.

7. The welding machine according to claim 6 further comprises: A sampling unit, which is configured to sample the second pulse output by the power supply, determine the pulse parameters of the second pulse, and send the pulse parameters of the second pulse to the control unit.

8. The welding machine according to claim 7, wherein, The parameters for which the sampling unit samples the second pulse include the rise time, the peak current duration, and the fall time.

9. The welding machine according to claim 8, wherein, The control unit is further configured to: when the difference between the inductance of the welding loop and the inductance of the welding line is greater than the first threshold value, adjust the waveform parameters of the first pulse based on the difference between the effective energy value of the first pulse and the effective energy value of the second pulse to generate an adjusted pulse.

10. The welding machine according to claim 9, wherein, The waveform parameters of the first pulse include at least one of the base current, the peak current, and the peak duration of the first pulse, and the effective energy value of the adjusted pulse is equal to the effective energy value of the first pulse.

11. The welding machine according to any one of claims 6 to 10, wherein, The control unit sends the pulse parameters of the adjusted pulse to the drive unit, and the drive unit drives the power supply to output the adjusted pulse according to the pulse parameters of the adjusted pulse.

12. The welding machine according to claim 6, wherein, The first threshold value is determined according to the welding requirements.

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