Pulse type direct current electric arc welder and control method thereof

Abstract

The invention provides a pulse type direct current arc welding machine and a control method thereof. The pulse type direct current arc welding machine comprises an input module, a control module and an output module. The input module is used for inputting the thickness of a workpiece to be welded; according to the thickness, input by the input module, of the workpiece to be welded, the control module is used for matching corresponding preset quantities, the preset quantities comprise multiple groups, and each group of preset quantities comprise basic peak current, basic basic value current, basic pulse frequency and basic duty ratio; and the output module is used for outputting pulse welding current according to the matched basic peak current, basic base current, basic pulse frequency and basic duty ratio. According to the method, welding can be completed only by inputting the thickness of the workpiece to be welded by an operator, so that the method is simpler to operate.

Description

Technical Field

[0001] The invention belongs to the technical field of pulsed DC arc welding, and in particular relates to a pulsed DC arc welding machine and a control method thereof. Background Art

[0002] Pulsed DC arc welding is an advanced welding technology that is widely used due to its high welding quality. However, the welding current of pulsed DC arc welding includes peak current, base current, pulse frequency and duty cycle, and its control method is relatively complex, requiring experienced operators to achieve high-quality welds.

[0003] A Chinese patent document with publication number CN112894079A provides a digital pulsed DC manual arc welding method, the basic principle of which is: the user inputs the peak current and pulse frequency according to the actual welding requirements; the preset base current is automatically matched according to the peak current, and the duty cycle is a preset fixed value; in this way, the operator only needs to input the peak current and pulse frequency, and the welding current will be automatically output, which includes the input peak current, the preset base current matching the peak current, the input pulse frequency and the preset fixed value duty cycle.

[0004] The above control method only needs to input the peak current and pulse frequency, which simplifies the control method of pulsed DC arc welding to a certain extent. However, it is still difficult for inexperienced operators to input the appropriate peak current according to the actual welding situation. If the peak current input is too high, the workpiece to be welded will be welded through; if the peak current input is too low, the welding of the workpiece to be welded will not be firm. Summary of the invention

[0005] One of the purposes of the present invention is to provide a pulsed DC arc welding machine, which can match the appropriate pulse welding current and output the pulse welding current to complete the welding, only requiring the operator to input the thickness of the workpiece to be welded, thereby reducing the difficulty of using the pulsed DC arc welding machine for inexperienced operators.

[0006] To achieve one of the purposes of the present invention, a pulsed DC arc welding machine includes an input module, a control module and an output module; the input module is used to input the thickness of the workpiece to be welded; according to the thickness of the workpiece to be welded input by the input module, the control module is used to match the corresponding preset quantities, and the preset quantities include multiple groups, each group of the preset quantities includes a basic peak current, a basic base current, a basic pulse frequency and a basic duty cycle; the output module is used to output a pulse welding current according to the matched basic peak current, basic base current, basic pulse frequency and basic duty cycle.

[0007] Preferably, the pulsed DC arc welding machine further comprises a peak current regulating module, wherein the peak current regulating module is connected to the control module, and the peak current regulating module is used to regulate the basic peak current.

[0008] Preferably, the pulsed DC arc welding machine further comprises a pulse frequency regulating module, wherein the pulse frequency regulating module is connected to the control module, and the pulse frequency regulating module is used to regulate the basic pulse frequency.

[0009] Preferably, the pulsed DC arc welding machine further comprises a base current regulating module, wherein the base current regulating module is connected to the control module and is used for regulating the basic base current.

[0010] Preferably, the pulsed DC arc welding machine further comprises a duty cycle adjustment module, wherein the duty cycle adjustment module is connected to the control module, and the duty cycle adjustment module is used to adjust the basic duty cycle.

[0011] Preferably, the pulsed DC arc welding machine further comprises a storage module, wherein the storage module is connected to the control module, and the storage module is used to store the pulse welding current.

[0012] Preferably, the pulsed DC arc welding machine further comprises a display module, wherein the display module is connected to the control module, and the display module is used to display the pulse welding current.

[0013] Preferably, the preset amount also includes a welding rod diameter.

[0014] The second purpose of the present invention is to provide a control method for pulsed DC arc welding, which can match the appropriate pulse welding current and output the pulse welding current to complete the welding, thereby reducing the difficulty of using the pulsed DC arc welding machine for inexperienced operators.

[0015] To achieve the second object of the present invention, a control method for pulsed DC arc welding comprises the following steps:

[0016] Step 1: Determine the thickness of the workpiece to be welded;

[0017] Step 2: Input the thickness of the workpiece to be welded through the input module;

[0018] Step 3: According to the thickness of the workpiece to be welded input by the input module, the control module matches the corresponding preset quantity; the preset quantity includes multiple groups, and each group of the preset quantity includes a basic peak current, a basic base current, a basic pulse frequency and a basic duty cycle;

[0019] Step 4: The output module outputs the pulse welding current according to the matching basic peak current, basic base current, basic pulse frequency and basic duty cycle.

[0020] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, the operator inputs the thickness of the workpiece to be welded within a certain range, and the database pre-stores preset quantities that match the different thicknesses of the workpiece to be welded, and the preset quantities include basic peak current, basic base current, basic pulse frequency, and basic duty cycle. Therefore, according to the actual thickness of the workpiece to be welded, when the operator inputs a certain thickness value into the input module, the database automatically matches the corresponding basic peak current, basic base current, basic pulse frequency, and basic duty cycle. The matched values ​​are the preferred values ​​that have been verified by experiments in advance, which can avoid short circuits, poor stability of the welding process, and low welding quality during the welding process, making the weld formation more beautiful and the welding quality better. The present invention only requires the operator to input the thickness of the workpiece to be welded to complete the welding, making the present invention simpler in operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the module structure of the arc welding machine of the present invention.

[0022] Figure 2 is a flow chart of the control method of the present invention. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element, or there may be an element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element, or there may be an element centered thereon. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0025] Unless otherwise defined, all technical terms and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0026] See also Figure 1-2The present invention provides a pulsed DC arc welding machine, comprising an input module, a control module and an output module; the input module is used to input the thickness of a workpiece to be welded; according to the thickness of the workpiece to be welded input by the input module, the control module is used to match corresponding preset quantities, the preset quantities include multiple groups, each group of preset quantities includes basic peak current, basic base current, basic pulse frequency and basic duty cycle; the output module is used to output pulse welding current according to the matched basic peak current, basic base current, basic pulse frequency and basic duty cycle.

[0027] Pulse current welding requires the following values: peak current, base current, pulse frequency and duty cycle, which together determine the output of the pulse welding current. In the present invention, the operator inputs the thickness of the workpiece to be welded within a certain range, and the database pre-stores preset quantities that match the different thicknesses of the workpiece to be welded, and the preset quantities include basic peak current, basic base current, basic pulse frequency and basic duty cycle. Therefore, according to the actual thickness of the workpiece to be welded, when the operator inputs a certain thickness value into the input module, the database automatically matches the corresponding basic peak current, basic base current, basic pulse frequency and basic duty cycle. The matched values ​​are the preferred values ​​that have been verified by experiments in advance, which can avoid short circuits, poor stability of the welding process and low welding quality during welding, making the weld formation more beautiful and the welding quality better. This full-volume automatic matching method makes the electric welding machine of the present invention simpler to operate.

[0028] Furthermore, a pulsed DC arc welding machine also includes a peak current regulating module, which is connected to the control module and is used to regulate the basic peak current. By adding the peak current regulating module, the basic peak current can be further regulated according to the actual welding conditions to prevent the workpiece to be welded from being welded through or the welding from being loose.

[0029] Furthermore, the peak current adjustment module is provided with 11 gears distributed in an arithmetic progression from 0 to 10. When the operator selects different gears, the value of the peak current = basic peak current + NK; K is a fixed value, indicating the difference in peak currents between adjacent gears, and N represents the gear. For example, K = 1A, when N = 0, the value of the peak current = basic peak current + 0; when N = 3 (with gear 0 as the original gear, rotated 3 gears to the right), the value of the peak current = basic pulse current + 3; when N = -3 (with gear 0 as the original gear, rotated 3 gears to the left), the value of the peak current = basic peak current - 3.

[0030] Furthermore, a pulsed DC arc welding machine further includes a pulse frequency adjustment module, which is connected to the control module and is used to adjust the basic pulse frequency. Through the pulse frequency adjustment module, the basic pulse frequency can be further adjusted according to the actual welding conditions, so as to adjust the density of the weld.

[0031] Furthermore, the pulse frequency adjustment module is provided with 11 gears distributed in an arithmetic progression from 0 to 10. When the operator selects different gears, the value of the pulse frequency = basic pulse frequency + NK; K is a fixed value, indicating the difference in pulse frequency between adjacent gears, and N represents the gear. For example, K = 1HZ, when N = 0, the value of the pulse frequency = basic pulse frequency + 0; when N = 3 (with gear 0 as the original gear, rotated 3 gears to the right), the value of the pulse frequency = basic pulse frequency + 3; when N = -3 (with gear 0 as the original gear, rotated 3 gears to the left), the value of the pulse frequency = basic pulse frequency - 3.

[0032] Furthermore, a pulsed DC arc welding machine also includes a base current adjustment module, which is connected to the control module and is used to adjust the basic base current. Through the base current adjustment module, the basic base current can be further adjusted according to the actual welding situation, which can further improve the welding quality.

[0033] Furthermore, the base current regulating module is provided with 11 gears distributed in an arithmetic progression from 0 to 10. When the operator selects different gears, the value of the base current = basic base current + NK; K is a fixed value, indicating the difference between the base currents of adjacent gears, and N represents the gear. For example, K = 1A, when N = 0, the value of the base current = basic base current + 0; when N = 3 (with the 0 gear as the original gear, rotated 3 gears to the right), the value of the base current = basic base current + 3; when N = -3 (with the 0 gear as the original gear, rotated 3 gears to the left), the value of the base current = basic base current - 3.

[0034] Furthermore, a pulsed DC arc welding machine also includes a duty cycle adjustment module, which is connected to the control module and is used to adjust the basic duty cycle. Through the duty cycle adjustment module, the basic duty cycle can be further adjusted according to the actual welding conditions, and the welding speed can be adjusted.

[0035] The duty cycle adjustment module is provided with 11 gears distributed in an arithmetic progression from 0 to 10. When the operator selects different gears, the value of the duty cycle = basic duty cycle + NK; K is a fixed value, indicating the difference in duty cycles between adjacent gears, and N represents the gear. For example, K = 1%, when N = 0, the value of the duty cycle = basic duty cycle + 0; when N = 3 (with gear 0 as the original gear, rotated 3 gears to the right), the value of the duty cycle = basic duty cycle + 3%; when N = -3 (with gear 0 as the original gear, rotated 3 gears to the left), the value of the duty cycle = basic duty cycle - 3%.

[0036] Furthermore, a pulsed DC arc welding machine further includes a storage module, which is connected to the control module and is used to store the pulse welding current. The storage module stores the adjusted basic peak current, basic base current, basic pulse frequency and basic duty cycle, so that in subsequent use, when welding workpieces of the same thickness, the peak current, base current, pulse frequency and duty cycle in the storage module can be matched, thereby making the operation more intelligent and more in line with the operator's habits.

[0037] Furthermore, a pulsed DC arc welding machine further includes a display module, which is connected to the control module and is used to display the pulse welding current. The display module displays the peak current, base current, pulse frequency and duty cycle of the pulse welding current, so that the operator can intuitively monitor various data of the welding current.

[0038] Furthermore, the preset amount also includes the welding rod diameter. In the database, the welding rod diameter matching the workpiece to be welded is pre-stored and displayed through the display module, which can further reduce the difficulty of operating the electric welder of the present invention; the operator only needs to input the thickness of the workpiece to be welded, and can select the welding rod diameter displayed by the display module, so that the operation mode of the electric welder can realize the "one-button" mode.

[0039] Some of the preset values ​​in the database are optimal values ​​obtained through a large number of experiments, as shown in the following table.

[0040]

[0041]

[0042] The pulse welding current in the above table is selected from 20 groups of values ​​in the database that match the thickness of different workpieces to be welded. For example, when the operator inputs the thickness of the workpiece to be welded as 8.0mm through the input module, the database automatically matches the basic peak current of 150A, the basic base current of 120A, the basic pulse frequency of 1Hz, the basic duty cycle of 55%, and the electrode diameter of 3.2mm. The operator does not need to enter any other values, thereby ensuring the convenience of pulse current welding operation and the quality of welding. For example, 6.0mm<When the thickness of the workpiece to be welded is <7.0mm, the "small principle" is adopted, that is, the operator inputs the thickness of the workpiece to be welded as 6.0mm through the input module, and the database automatically matches the basic peak current of 130A, the basic base current of 100A, the basic pulse frequency of 1Hz, the basic duty cycle of 55%, and the electrode diameter of 3.2mm.

[0043] The control method of the pulsed DC arc welding machine comprises the following steps:

[0044] Step 1: Determine the thickness of the workpiece to be welded;

[0045] Step 2: Input the thickness of the workpiece to be welded through the input module;

[0046] Step 3: According to the thickness of the workpiece to be welded input by the input module, the control module matches the corresponding preset quantity; the preset quantity includes multiple groups, and each group of the preset quantity includes a basic peak current, a basic base current, a basic pulse frequency and a basic duty cycle;

[0047] Step 4: The output module outputs the pulse welding current according to the matched basic peak current, basic base current, basic pulse frequency and basic duty cycle.

[0048] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A pulsed DC arc welding machine, characterized in that: include: An input module, the input module is used to input the thickness of the workpiece to be welded; A control module, according to the thickness of the workpiece to be welded input by the input module, the control module is used to match the corresponding preset amount, the preset amount includes multiple groups, each group of the preset amount includes a basic peak current, a basic base current, a basic pulse frequency and a basic duty cycle; An output module is used to output a pulse welding current according to a matched basic peak current, basic base current, basic pulse frequency and basic duty cycle.

2. The pulsed DC arc welding machine according to claim 1, characterized in that: Also includes: A peak current regulating module, wherein the peak current regulating module is connected to the control module and is used to regulate the basic peak current.

3. The pulsed DC arc welding machine according to claim 1, characterized in that: Also includes: A pulse frequency adjustment module, wherein the pulse frequency adjustment module is connected to the control module, and the pulse frequency adjustment module is used to adjust the basic pulse frequency.

4. The pulsed DC arc welding machine according to claim 1, characterized in that: Also includes: A base current regulating module, wherein the base current regulating module is connected to the control module and is used to regulate the basic base current.

5. The pulsed DC arc welding machine according to claim 1, characterized in that: Also includes: Duty cycle adjustment module; The duty cycle adjustment module is connected to the control module, and the duty cycle adjustment module is used to adjust the basic duty cycle.

6. The pulsed DC arc welding machine according to any one of claims 2 to 5, characterized in that: Also includes: A storage module is connected to the control module, and the storage module is used to store the pulse welding current.

7. The pulsed DC arc welding machine according to any one of claims 1 to 5, characterized in that: Also includes: A display module is connected to the control module, and is used to display the pulse welding current.

8. The pulsed DC arc welding machine according to claim 7, characterized in that: The preset amount also includes the welding rod diameter.

9. The control method of a pulsed DC arc welding machine according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Determine the thickness of the workpiece to be welded; Step 2: Input the thickness of the workpiece to be welded through the input module; Step 3: According to the thickness of the workpiece to be welded input by the input module, the control module matches the corresponding preset quantity; the preset quantity includes multiple groups, and each group of the preset quantity includes a basic peak current, a basic base current, a basic pulse frequency and a basic duty cycle; Step 4: The output module outputs the pulse welding current according to the matching basic peak current, basic base current, basic pulse frequency and basic duty cycle.

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