Fish scale pattern welding method and device

Abstract

The invention provides a fish scale pattern welding method and device, and belongs to the technical field of fish scale pattern welding. The method mainly comprises the steps that in the welding process, high energy and low energy are switched according to preset high-energy cycle time and low-energy cycle time, the welding current of the high-energy cycle is pulse current, and the welding current of the low-energy cycle is direct-current short-circuit current; and if the polarities of the high energy and the low energy are different during switching of the high energy and the low energy, polarity switching is conducted during the short-circuit period of the welding wire in response to the welding wire short-circuit signal and the polarity switching signal, and it is guaranteed that the welding wire is still in the short-circuit state after polarity switching. According to the method, the welding heat in high and low energy periods can be effectively reduced, the overall welding heat input amount is further reduced, the low-energy period molten pool is easier to cool, and it can be guaranteed that the fish scale lines are formed clearly and beautifully.

Description

Technical Field

[0001] The present invention relates to a method and device for fish-scale pattern welding, belonging to the technical field of fish-scale pattern welding. Background Art

[0002] With the development of technology and the improvement of welding quality, welded products not only require satisfactory welding quality but also good appearance forming. Among them, the fish-scale pattern appearance of the weld seam is currently generally recognized as one of the best forming effects.

[0003] Currently, the more widely used fish-scale pattern welding methods include the double-pulse welding method, the MIX welding method with pulse and DC switching, the interrupted arc welding method of continuous spot welding, etc. Among them, the double-pulse welding method switches high-pulse current and low-pulse current according to the set frequency and duty cycle. Since the energy during the low-pulse period does not decrease significantly, the molten pool does not solidify during the low-pulse period, and the fish-scale pattern shape of the formed weld seam is not obvious, and the aesthetic degree is not high. The MIX welding method uses the method of switching between pulse and DC, reducing the heat input during DC welding to accelerate the solidification of the molten pool, and can form a relatively obvious fish-scale pattern. However, the effect of reducing the heat input is limited. The interrupted arc welding method uses the method of intermittent welding, which can effectively reduce the heat input, and the fish-scale pattern is clear and beautiful, and the forming is excellent. However, because arc striking is required again after each arc interruption, obvious spatter will be generated each time arc striking, and there is a certain probability of arc striking failure during arc striking, resulting in poor forming. Therefore, the interrupted arc welding cannot meet the on-site requirements in some occasions with high spatter requirements. Summary of the Invention

[0004] The purpose of the present invention is to provide a new type of fish-scale pattern welding method and device. On the basis of the MIX method, the pulse current and DC current are switched through a special control method to ensure that the polarity conversion must occur during the short circuit period, which can effectively reduce the welding heat in the high and low energy cycles, further reduce the overall welding heat input, and make the molten pool in the low energy cycle easier to cool. It can not only ensure the clear and beautiful forming of the fish-scale pattern but also avoid arc interruption, broaden its application range, and is more suitable for thin plate welding.

[0005] To achieve the above object / To solve the above technical problems, the present invention is implemented by the following technical solutions:

[0006] On the one hand, the present invention provides a fish-scale pattern welding method, characterized by including the following steps:

[0007] During the welding process, the high and low energy are switched according to the preset high energy cycle time and low energy cycle time. Among them, the welding current in the high energy cycle is a pulse current, and the welding current in the low energy cycle is a DC short circuit current;

[0008] If the polarities of the high and low energies are different when switching between high and low energies, then in response to the wire short - circuit signal and the polarity - switching signal, the polarity is switched during the wire short - circuit period and it is ensured that the wire remains in the short - circuit state after the polarity is switched.

[0009] Combined with the first aspect, further, if the polarities of the high and low energies are different when switching from the high - energy period to the low - energy period, control the wire to approach the base material. When the droplet at the tip of the wire touches the base material, the wire becomes short - circuited; in response to the wire short - circuit signal and the polarity - switching signal, switch the welding - current polarity during the wire short - circuit period, and continue to short - circuit for a period of time after the polarity switching is completed. At the same time, control the wire to move away from the base material and wait for arcing to occur; in response to the successful arcing signal, control the welding power source to output a direct - current, and perform welding according to the law of the arcing t2 time period and the short - circuit t3 time period until the low - energy period ends;

[0010] If the polarities of the high and low energies are different when switching from the low - energy period to the high - energy period, make the welding current continuously output as a direct - current, and at the same time control the wire to approach the base material. When the droplet at the tip of the wire touches the base material, the wire becomes short - circuited; in response to the wire short - circuit signal and the polarity - switching signal, switch the welding - current polarity during the wire short - circuit period, and continue to short - circuit for a period of time after the polarity switching is completed. At the same time, control the wire to move away from the base material and wait for arcing to occur; in response to the successful arcing signal, control the welding power source to output a pulsed current.

[0011] Combined with the first aspect, further, the welding current in the low - energy period is output in the straight - polarity connection mode.

[0012] Combined with the first aspect, further, the welding current in the high - energy period is output in the reverse - polarity connection mode.

[0013] Combined with the first aspect, further, when switching from the high - energy period to the low - energy period, make the welding current continuously output as a pulsed base current and wait for the wire to become short - circuited; in response to the wire short - circuit signal and the polarity - switching signal, convert the welding current from reverse - connection to straight - connection during the wire short - circuit period to complete the polarity switching; continue to short - circuit for a period of time and wait for arcing to occur; in response to the successful arcing signal, control the welding power source to output a direct - current, and perform welding according to the law of the arcing t2 time period and the short - circuit t3 time period until the low - energy period ends;

[0014] When switching from the low - energy period to the high - energy period, make the welding current continuously output as a direct - current and wait for the wire to become short - circuited; in response to the wire short - circuit signal and the polarity - switching signal, convert the welding current from straight - connection to reverse - connection during the wire short - circuit period to complete the polarity switching; continue to short - circuit for a period of time and wait for arcing to occur; in response to the successful arcing signal, control the welding power source to output an alternating - current pulsed current.

[0015] In combination with the first aspect, further, the welding current in the high-energy period adopts an alternating current pulse current.

[0016] In combination with the first aspect, further, when switching from the high-energy period to the low-energy period, if the alternating current pulse current is reverse-connected, first output continuously with the pulse base current, wait for the welding wire to short-circuit, in response to the welding wire short-circuit signal and the polarity switching signal, switch the welding current from reverse connection to forward connection during the short-circuit of the welding wire, continue to short-circuit for a period of time, and in response to the successful arc ignition signal, control the welding power source to output a direct current;

[0017] When switching from the high-energy period to the low-energy period, if the alternating current pulse current is forward-connected, first output continuously with the current at the current moment, wait for the welding wire to short-circuit, after short-circuiting for a period of time, in response to the successful arc ignition signal, control the welding power source to output a direct current.

[0018] In combination with the first aspect, further, the value range of the short-circuit time corresponding to the polarity switching is 0.5 - 5 ms.

[0019] In the second aspect, the present invention provides a fish-scale pattern welding device, including:

[0020] A welding control module, used for switching between high and low energies according to the preset high-energy period time and low-energy period time during the welding process, wherein the welding current in the high-energy period is a pulse current, and the welding current in the low-energy period is a direct current short-circuit current;

[0021] A polarity switching module, used for if the polarities of high and low energies are different when switching between high and low energies, then in response to the welding wire short-circuit signal and the polarity switching signal, perform polarity switching during the short-circuit of the welding wire and ensure that the welding wire is still in a short-circuit state after polarity switching.

[0022] In combination with the second aspect, further, the polarity switching module is specifically used for:

[0023] If the polarities of high and low energies are different when switching from the high-energy period to the low-energy period, control the welding wire to approach the base material, when the molten droplet at the tip of the welding wire contacts the base material, the welding wire short-circuits; in response to the welding wire short-circuit signal and the polarity switching signal, switch the polarity of the welding current during the short-circuit of the welding wire, and continue to short-circuit for a period of time after the polarity switching is completed, at the same time control the welding wire to move away from the base material and wait for arc ignition; in response to the successful arc ignition signal, control the welding power source to output a direct current, and perform welding according to the law of the arc ignition t2 time period and the short-circuit t3 time period until the low-energy period time ends;

[0024] If the polarities of high and low energy are different when switching from a low-energy cycle to a high-energy cycle, keep the welding current output continuously as a direct current, and at the same time control the welding wire to approach the base material. When the molten droplet at the tip of the welding wire contacts the base material, the welding wire will short-circuit; in response to the welding wire short-circuit signal and the polarity switching signal, switch the polarity of the welding current during the short-circuit of the welding wire, and continue the short-circuit for a period of time after the polarity switching is completed, and at the same time control the welding wire to move away from the base material and wait for arcing to occur; in response to the successful arcing signal, control the welding power source to output a pulsed current.

[0025] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0026] The present invention provides a fish-scale pattern welding method and device, which are improved on the basis of the MIX method. Aiming at the problem of high and low energy switching during the welding process, a control operation for switching the high and low energy polarities during short-circuit is proposed, which can effectively reduce the welding heat in the high and low energy cycles, further reduce the overall welding heat input, make the molten pool in the low energy cycle easier to cool, ensure the clear and beautiful formation of the fish-scale pattern. By switching the high and low energy through the method of the present invention, there is no zero-crossing problem, so there is no arc-breaking problem, which can avoid the poor formation caused by arc-breaking and further improve the fish-scale pattern welding effect. Compared with the traditional welding process, the present invention broadens the applicable range of fish-scale pattern welding and is more suitable for thin plate welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The figure shows a step schematic diagram of a fish-scale pattern welding method provided by the present invention;

[0028] Figure 2 The figure shows a current timing diagram of the fish-scale pattern welding method in an embodiment of the present invention;

[0029] Figure 3 The figure shows a current switching schematic diagram of welding with alternating direct current reverse pulse current and direct current straight-through short-circuit current in an embodiment of the present invention;

[0030] Figure 4 The figure shows a current switching schematic diagram of alternating current pulse current switching from straight-through to reverse and then switching to direct current straight-through short-circuit current in an embodiment of the present invention;

[0031] Figure 5 The figure shows a current switching schematic diagram of alternating current pulse current switching to direct current straight-through short-circuit current when in the pulse base value stage in an embodiment of the present invention;

[0032] Figure 6 The figure shows a current switching schematic diagram of alternating current pulse current switching to direct current straight-through short-circuit current when in the pulse falling edge stage in an embodiment of the present invention;

[0033] Figure 7The figure shows a schematic diagram of current switching from the positive peak stage of the alternating current pulse current to the direct current positive connection short - circuit current in the embodiment of the present invention;

[0034] Figure 8 The figure shows a schematic diagram of current switching from the pulse rising - edge stage of the alternating current pulse current to the direct current positive connection short - circuit current in the embodiment of the present invention;

[0035] Figure 9 The figure shows a schematic structural diagram of a fish - scale pattern welding device provided by the embodiment of the present invention. Detailed implementation manners

[0036] The technical solution of the present invention will be described in detail below with reference to the drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solution of the present invention, rather than limitations on the technical solution of the present invention. Without conflict, the technical features in the embodiments of the present invention and the embodiments can be combined with each other.

[0037] Embodiment 1

[0038] This embodiment introduces a fish - scale pattern welding method. As Figure 1 shown, it specifically includes the following steps:

[0039] Step A: Switch between high - energy and low - energy according to the preset high - energy cycle time and low - energy cycle time. The welding current in the high - energy cycle is a pulse current, and the welding current in the low - energy cycle is a direct - current short - circuit current. The high - energy and low - energy switching timing diagram of the method of the present invention is as Figure 2 shown, where the high - energy cycle time is T - A, the low - energy cycle time is T - B, the pulse current is I - A, and the direct - current short - circuit current is I - B.

[0040] Step B: When it is necessary to switch between high - energy and low - energy, wait for the molten droplet at the tip of the welding wire to contact the base material and cause a short - circuit. In response to the welding - wire short - circuit signal, perform high - energy and low - energy switching (switching from the pulse current to the direct - current short - circuit current) during the short - circuit. At the same time, if the polarity of the pulse current is different from the polarity of the direct - current short - circuit current, in response to the polarity - switching signal, perform polarity switching during the welding - wire short - circuit, and ensure that the welding wire is still in a short - circuit state after polarity switching.

[0041] In the embodiment of the present invention, the welding current in the low - energy cycle is output in the form of direct - current straight polarity. In the form of direct - current straight polarity, due to the cathode spot acting on the consumable electrode, the amount of welding - wire melting is large, while the heat received by the base material is small, thus effectively reducing the heat input to the base material during the low - energy cycle, making the molten pool easier to cool during the low - energy period. While reducing the heat input, the formed fish - scale pattern effect is more beautiful.

[0042] During the pulse and short - circuit switching processes, as long as polarity switching is involved, whether it is switching from positive connection to negative connection or from negative connection to positive connection, there will be a problem of zero - crossing. When the arc passes through the zero - crossing during combustion, since the current drops to near zero, the small instantaneous current is very difficult to maintain the arc combustion, so the arc - breaking phenomenon is particularly likely to occur, that is, the arc goes out. Once the arc goes out, the welding process will be interrupted and it is necessary to re - strike the arc. If the frequency of arc - breaking is high, a stable welding cannot be formed. For the above reasons, the present invention designs a brand - new polarity - switching control method, and uses the method of switching polarity during short - circuit to carry out welding. When high - and low - energy switching is accompanied by polarity switching, the welding wire is controlled to approach the base material. When the molten droplet at the tip of the welding wire contacts the base material, a short - circuit occurs. At this time, there is no arc, and the welding wire and the base material are in a conducting state. Switching the polarity (that is, switching from positive connection to negative connection or from negative connection to positive connection) in this state will not have the arc - breaking phenomenon. After the polarity switching is completed, the short - circuit continues for a period of time, and then the welding wire is controlled to move away from the base material, and the arc reignites. Since the polarity switching is completed in the short - circuit state, there is no arc - breaking, which can effectively ensure the stability of the arc and form a stable welding process.

[0043] In an embodiment of the present invention, the welding current in the high - energy period can adopt a DC pulse current and is output in the DC reverse - polarity connection mode. Take Figure 3 as an example to explain the specific control operations of polarity switching during the process of welding by alternating DC reverse - polarity pulse current and DC straight - polarity short - circuit current:

[0044] First, in the high - energy period, use the pulse current to weld for T - A time with a current value of I - A in the DC reverse - polarity connection mode. Secondly, enter the low - energy period and start timing for T - B time. Since the current is still in the reverse - polarity connection state at this time, if it is directly switched to the straight - polarity connection, there will be a zero - crossing problem. Therefore, in the present invention, it is not directly switched to the straight - polarity connection mode, but the pulse base current is continuously output, and at the same time, the welding wire is controlled to approach the base material and wait for the short - circuit to occur. Figure 3 The t0 time period in is the time period from entering the low - energy period to the occurrence of the short - circuit; when the short - circuit occurs, the t1 time period is the time period of the short - circuit occurrence. In the embodiment of the present invention, the polarity is switched at the start of the second slope of the t1 time period, switched from the DC reverse - polarity connection mode to the DC straight - polarity connection. Each time the switching is made, it is necessary to ensure that it is still in the short - circuit state after switching to the DC straight - polarity connection; continue the short - circuit for a period of time, and at the same time, control the welding wire to move away from the base material and wait for the arc to reignite. At this time, it has been switched to the DC straight - polarity connection mode, and there is no zero - crossing problem during the arc - reigniting period, so the switching is smooth; Figure 3 The t2 time period in is the arc - reigniting time period after the DC straight - polarity connection, and the t3 time period is the short - circuit time period after the straight - polarity connection. After the polarity switching is completed, the welding operation is carried out according to the rules of the arc - reigniting t2 time period and the short - circuit t3 time period using the DC straight - polarity current until the T - B time counting is completed.

[0045] After the low energy cycle is completed with the DC positive short circuit welding method and the IB current welding time TB, it enters the high energy cycle and starts the TA time again. Figure 3 At this time, the current does not directly switch to the reverse connection mode, nor does it immediately switch to the pulse welding mode, but waits for the t0' period to wait for the short circuit to occur again. Figure 3 As shown in the t4 time period in the figure; at the beginning of the second slope during the short circuit period of t4, the polarity is switched from DC positive connection to DC reverse connection. Each switch should ensure that it is still in the short circuit state after the switch; after the polarity switch is completed, the short circuit is continued for a period of time to wait for arcing. At this time, it has been switched to DC reverse connection. After the arcing ends, the DC reverse connection pulse current is output for welding. The fish scale pattern formed by the alternating operation is beautiful and the welding process is stable.

[0046] In the embodiment of the present invention, the t0 time is not a fixed value, but the time to wait for the welding wire to contact the base material to short-circuit after the TA time ends. Its specific value is related to the speed at which the welding wire approaches the base material. When the polarity needs to be switched, the t1 / t4 timing starts from the time when the welding wire contacts the base material to short-circuit. t1 / t4 is the short-circuit time corresponding to the polarity switching. The value range of t1 / t4 time is 0.5-5ms. If the time is too short, it is not conducive to completing the polarity switching. If the time is too long, it will affect the welding. The t2 time starts from the time when the welding wire separates from the base material and the arc is re-ignited until the welding wire contacts the base material again and short-circuits; the t3 time starts from the time when the welding wire contacts the base material and short-circuits until the welding wire separates from the base material. Both t2 and t3 are passive quantities. Their specific values are related to the moving speed of the welding wire, etc., and are not a specific set value.

[0047] Figure 3 During the short circuit period, a two-stage current control method of the first slope and the second slope is adopted. Depending on the welding material and the shielding gas, the current slope during the short circuit period can also be a single-stage, multi-stage or even a curve.

[0048] During the welding process, when the polarity is switched (i.e., switching from positive connection to reverse connection or from reverse connection to positive connection), it must be switched during the short circuit period. It can be switched during the first slope period, at the intersection of the first slope and the second slope, or at the second slope position. Of course, if it is divided into multiple slopes or curve slopes, it can be switched at any time in the multiple slopes and the curve slopes, as long as it is ensured that the switching is performed during the short circuit period and it is still in the short circuit state after the switching is completed.

[0049] exist Figure 3Among them, the current change during polarity switching is an instantaneous change. Depending on the current differences between straight polarity and reverse polarity, as well as the characteristics of welding materials, gases, etc., the current change may not be instantaneously switched during the actual operation process. It may also have a certain slope change. However, the total time of the slope change should be less than the short-circuit duration time.

[0050] In the embodiments of the present invention, only the mutual switching mode where DC reverse polarity is pulsed and DC straight polarity is short-circuited is listed. According to this rule, it can also be extended to the fish-scale pattern welding method where DC straight polarity is pulsed and DC reverse polarity is short-circuited, and the mutual switching is also within the protection scope of the present invention.

[0051] Embodiment 2

[0052] Different from Embodiment 1, in this embodiment, the welding current in the high-energy period adopts an AC pulsed current. Compared with the DC pulsed current, the welding heat of the AC pulsed current is lower, and the melting amount of the welding wire is larger. Taking Figure 4 as an example, the specific control operation of polarity switching during the welding process using the alternating welding of AC pulsed current and DC straight polarity short-circuit current is explained:

[0053] First of all, in the high-energy period, weld for T-A time with an AC pulsed current at a current value of I-A. Secondly, enter the low-energy period and start timing for T-B time. Since the switching position is exactly after the AC pulsed current switches from straight polarity to reverse polarity at this time, if directly switched to DC straight polarity, a zero-crossing problem will occur. Therefore, the present invention does not directly switch to the straight polarity mode, but continuously outputs the pulsed base current for t0 time until a short circuit occurs; the t1 time period is the time period when the short circuit occurs. When a short circuit occurs, the polarity is switched at the start of the second slope in the t1 time period, switching from the DC reverse polarity mode to DC straight polarity. Each time the switching must ensure that it is still in the short-circuit state after switching to DC straight polarity; after short-circuiting for a period of time, the welding wire moves away from the base material and arcing occurs. At this time, it has been switched to the DC straight polarity mode, and there is no zero-crossing problem during the arcing period, so the switching is smooth. After that, the welding operation is carried out according to the rules of arcing for t2 time period and short-circuiting for t3 time period until the T-B time timing is completed.

[0054] When the low-energy period is welded for T-B time with the DC straight polarity short-circuit welding method at a current of I-B, enter the high-energy period and start timing for T-A time again, starting from Figure 4It can be seen that at this time, the current is not directly switched to the reverse connection mode, nor immediately switched to the pulsed welding mode. Instead, it waits for a period of time t0' first, waiting for the welding wire to contact the base material and short-circuit again. A short circuit occurs during the t4 time period, and the polarity is switched at the start of the second slope during the t4 short circuit. It is switched from DC straight polarity to DC reverse polarity, and each switch must ensure that it remains in the short-circuit state after switching; after the polarity switch is completed, it continues to short-circuit for a period of time and then reignites. At this time, it has been switched to the DC reverse polarity mode. After the arc ignition ends, the DC reverse polarity AC pulsed current is output for welding.

[0055] In addition, since the AC pulsed current has a straight polarity and a reverse polarity part, and the T-A time and T-B time are determined according to the switching period and duty cycle set before welding, therefore, when the T-A time period arrives, the actual current waveform may be at any stage of the AC pulse cycle. In Figure 4 , the arrival moment of T-A is exactly in the stage after switching from straight polarity to reverse polarity, while in actual operation, the arrival moment of T-A may also appear in other stages. In the AC pulse waveform diagram given in the present invention, it mainly includes the pulse rising edge stage (such as the number 5 in Figure 4 ), the peak stage (such as the number 4 in Figure 4 ), the pulse falling edge stage (such as the number 3 in Figure 4 ), the pulse base value stage (such as the number 2 in Figure 4 ), etc.

[0056] When the T-A arrival moment, the AC pulse waveform is exactly before the pulse base value stage. At this time, it is necessary to wait until the pulse timing reaches the base value and then wait for the short circuit to occur. After the short circuit occurs, the polarity is switched according to the aforementioned control operation. The switching waveform diagram at this time is as shown in Figure 5 .

[0057] When the T-A arrival moment, the AC pulse waveform is exactly in the straight polarity state. Figure 4 At the numbers 3, 4, and 5 in Figures 6 - 8 , at this time, the current output at this moment is continued to wait for the short circuit to occur. Since the polarity has been switched to the straight polarity, when the short circuit occurs, there is no need to switch the polarity again, and only the output according to the straight polarity short circuit waveform is required. The current waveform diagram is as shown in

[0058] The embodiments of the present invention only list the mutual switching methods between AC pulses and DC straight polarity short circuits. According to this rule, it can also be extended to the fish scale pattern welding method of mutual switching between AC pulses and DC reverse polarity short circuits. The method of its switching timing is the same, so it is also within the protection scope of the present invention.

[0059] Embodiment 3

[0060] Based on the same inventive concept as in Embodiments 1 and 2, this embodiment introduces a fish-scale pattern welding device, as Figure 9 shown, mainly including a welding control module and a polarity switching module.

[0061] The welding control module is used to switch between high and low energies during the welding process according to the preset high-energy cycle time and low-energy cycle time. Among them, the welding current in the high-energy cycle is a pulsed current, and the welding current in the low-energy cycle is a DC short-circuit current.

[0062] The polarity switching module is used to, if the polarities of the high and low energies are different when switching between high and low energies, respond to the wire short-circuit signal and the polarity switching signal to perform polarity switching during the wire short-circuit period and ensure that the wire remains in the short-circuit state after polarity switching.

[0063] If the polarities of the high and low energies are different when switching from the high-energy cycle to the low-energy cycle, control the wire to approach the base material. When the molten droplet at the tip of the wire touches the base material, the wire short-circuits; in response to the wire short-circuit signal and the polarity switching signal, switch the welding current polarity during the wire short-circuit period, continue to short-circuit for a period of time after the polarity switching is completed, and at the same time control the wire to move away from the base material and wait for arcing to occur; in response to the successful arcing signal, control the welding power source to output a DC current and perform welding according to the law of the arcing t2 time period and the short-circuit t3 time period until the low-energy cycle time ends.

[0064] If the polarities of the high and low energies are different when switching from the low-energy cycle to the high-energy cycle, make the welding current continuously output as a DC current, and at the same time control the wire to approach the base material. When the molten droplet at the tip of the wire touches the base material, the wire short-circuits; in response to the wire short-circuit signal and the polarity switching signal, switch the welding current polarity during the wire short-circuit period, continue to short-circuit for a period of time after the polarity switching is completed, and at the same time control the wire to move away from the base material and wait for arcing to occur; in response to the successful arcing signal, control the welding power source to output a pulsed current.

[0065] In summary of the above embodiments, the present invention is improved on the basis of the MIX method. Aiming at the problem of high and low energy switching during the welding process, a control operation of switching the polarities of high and low energies during the short-circuit period is proposed, which can effectively reduce the welding heat in the high and low energy cycles, further reduce the overall welding heat input, make the molten pool in the low-energy cycle easier to cool, ensure the clear and beautiful formation of the fish-scale pattern. By switching the high and low energies through the method of the present invention, there is no zero-crossing problem, so there is no arc-breaking problem, which can avoid the poor formation caused by arc-breaking and further improve the fish-scale pattern welding effect. Compared with the traditional welding process, the present invention broadens the applicable range of fish-scale pattern welding and is more suitable for thin plate welding.

[0066] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) that contain computer-usable program code.

[0067] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices produce means for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0068] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory produce a manufactured article including instruction means that implement the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0069] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0070] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the spirit and scope protected by the present invention and the claims. These all fall within the protection scope of the present invention.

Claims

1. A fish-scale pattern welding method, characterized in that, It includes the following steps: During the welding process, high and low energy are switched according to the preset high-energy cycle time and low-energy cycle time. Among them, the welding current in the high-energy cycle is a pulsed current, and the welding current in the low-energy cycle is a DC short-circuit current; If the polarities of high and low energy are different when switching between high and low energy, in response to the wire short-circuit signal and the polarity switching signal, the polarity is switched during the wire short-circuit period and it is ensured that the wire remains in the short-circuit state after the polarity is switched.

2. The fish-scale pattern welding method according to claim 1, characterized in that If the polarities of high and low energy are different when switching from the high-energy cycle to the low-energy cycle, control the wire to approach the base material. When the droplet at the tip of the wire touches the base material, the wire will short-circuit; In response to the wire short-circuit signal and the polarity switching signal, switch the welding current polarity during the wire short-circuit period, continue to short-circuit for a period of time after the polarity switching is completed, and at the same time control the wire to move away from the base material and wait for arcing to occur. In response to the successful arcing signal, control the welding power source to output a DC current and perform welding according to the law of the arcing t2 time period and the short-circuit t3 time period until the low-energy cycle time ends; If the polarities of high and low energy are different when switching from the low-energy cycle to the high-energy cycle, let the welding current continuously output as a DC current, and at the same time control the wire to approach the base material. When the droplet at the tip of the wire touches the base material, the wire will short-circuit; In response to the wire short-circuit signal and the polarity switching signal, switch the welding current polarity during the wire short-circuit period, continue to short-circuit for a period of time after the polarity switching is completed, and at the same time control the wire to move away from the base material and wait for arcing to occur. In response to the successful arcing signal, control the welding power source to output a pulsed current.

3. The fish-scale pattern welding method according to claim 1, wherein The welding current in the low-energy cycle is output in the DC straight polarity connection mode.

4. The fish-scale pattern welding method according to claim 3, characterized in that, The welding current in the high-energy cycle is output in the DC reverse polarity connection mode.

5. The fish-scale pattern welding method according to claim 4, wherein When switching from the high-energy cycle to the low-energy cycle, let the welding current continuously output as the pulsed base current and wait for the wire to short-circuit; In response to the wire short-circuit signal and the polarity switching signal, convert the welding current from reverse connection to straight connection during the wire short-circuit period to complete the polarity switching; continue to short-circuit for a period of time and wait for arcing to occur. In response to the successful arcing signal, control the welding power source to output a DC current and perform welding according to the law of the arcing t2 time period and the short-circuit t3 time period until the low-energy cycle time ends; When switching from the low-energy cycle to the high-energy cycle, let the welding current continuously output as a DC current and wait for the wire to short-circuit; In response to the wire short-circuit signal and the polarity switching signal, convert the welding current from straight connection to reverse connection during the wire short-circuit period to complete the polarity switching; continue to short-circuit for a period of time and wait for arcing to occur. In response to the successful arcing signal, control the welding power source to output an AC pulsed current.

6. The fish-scale pattern welding method according to claim 3, characterized in that, The welding current in the high-energy cycle is an AC pulsed current.

7. The fish scale pattern welding method according to claim 6, wherein When switching from the high-energy cycle to the low-energy cycle, if the AC pulsed current is in reverse connection, first continuously output as the pulsed base current and wait for the wire to short-circuit. In response to the wire short-circuit signal and the polarity switching signal, convert the welding current from reverse connection to straight connection during the wire short-circuit period, continue to short-circuit for a period of time, and then in response to the successful arcing signal, control the welding power source to output a DC current; When switching from a high-energy cycle to a low-energy cycle, if the alternating current pulse current is in the straight polarity connection, the current at the current moment is continuously output first, and the wire is waited for to short-circuit. After short-circuiting for a period of time, in response to the successful arc ignition signal, the welding power source is controlled to output a direct current.

8. The fish-scale pattern welding method according to claim 5 or 7, characterized in that, The value range of the short-circuit time corresponding to the polarity switch is 0.5 - 5 ms.

9. A fish-scale pattern welding device, characterized in that, It includes: A welding control module, which is used to switch between high and low energies according to the preset high-energy cycle time and low-energy cycle time during the welding process. Among them, the welding current in the high-energy cycle is a pulse current, and the welding current in the low-energy cycle is a direct current short-circuit current; A polarity switching module, which is used to, if the polarities of high and low energies are different when switching between high and low energies, in response to the wire short-circuit signal and the polarity switching signal, perform polarity switching during the wire short-circuit period and ensure that the wire remains in a short-circuit state after polarity switching.

10. The fish-scale pattern welding device according to claim 9, characterized in that, The polarity switching module is specifically used for: If the polarities of high and low energies are different when switching from a high-energy cycle to a low-energy cycle, control the wire to approach the base material. When the molten droplet at the tip of the wire contacts the base material, the wire short-circuits; In response to the wire short-circuit signal and the polarity switching signal, switch the polarity of the welding current during the wire short-circuit period, continue to short-circuit for a period of time after the polarity switching is completed, and at the same time control the wire to move away from the base material and wait for arc ignition; in response to the successful arc ignition signal, control the welding power source to output a direct current, and perform welding according to the rule of the arc ignition t2 time period and the short-circuit t3 time period until the low-energy cycle time ends; If the polarities of high and low energies are different when switching from a low-energy cycle to a high-energy cycle, make the welding current continuously output as a direct current, and at the same time control the wire to approach the base material. When the molten droplet at the tip of the wire contacts the base material, the wire short-circuits; In response to the wire short-circuit signal and the polarity switching signal, switch the polarity of the welding current during the wire short-circuit period, continue to short-circuit for a period of time after the polarity switching is completed, and at the same time control the wire to move away from the base material and wait for arc ignition; in response to the successful arc ignition signal, control the welding power source to output a pulse current.

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