Fish scale pattern welding method

Abstract

The invention relates to a fish scale pattern welding method and a welding machine, and belongs to the technical field of fish scale pattern welding, the method comprises a plurality of welding periods, each period comprises a pulse stage and an arc breaking stage, and the arc breaking stage comprises the steps that in response to the end of the last pulse of the pulse stage, forward wire feeding is carried out to enable a welding wire to stretch into a molten pool; after the welding wire extends into the molten pool, the welding wire is continuously fed in the forward direction for a first time; wire feeding is stopped after the first time, so that the welding wire stays and is kept in contact with the molten pool; the welding wire stays for a second time; and after the second time, reverse wire drawing is carried out to enable the welding wire to leave the molten pool so as to carry out the next welding period. The stability of the molten pool is guaranteed by the process that the welding wire extends into the molten pool and is kept, and the situation that the fish scale surface does not have fine textures due to oscillation is avoided; and meanwhile, the welding wire can also play a role in heat dissipation on the molten pool, and the purpose of reducing heat input is achieved. And on the whole, the welded fish scale patterns are clearer and more attractive, the welding heat is lower, and the device is suitable for welding occasions with high appearance requirements.

Description

Technical Field

[0001] The invention relates to a fish scale welding method and belongs to the technical field of fish scale welding. Background Art

[0002] In the actual application of MIG / MAG welding, low heat input control and beautiful fish scale pattern formation are one of the goals that everyone is constantly pursuing. Lower welding heat input can weld thinner plates and reduce welding costs. Beautiful fish scale pattern formation can eliminate the post-weld processing process and increase the appearance of the product after welding. However, most of the existing technologies use pulse welding, the molten pool stability is poor during the welding process, and fine textures are likely to exist on the surface of the fish scale pattern. Summary of the invention

[0003] The object of the present invention is to provide a fish-scale welding method, which can calm the molten pool and accelerate heat dissipation by adding an arc breaking stage and corresponding wire feeding control, so as to achieve the purpose of improving the stability of the molten pool and making the fish-scale pattern clearer.

[0004] To achieve the above object, the present invention is implemented by adopting the following technical solutions.

[0005] In a first aspect, the present invention provides a fish scale welding method, the method comprising a plurality of welding cycles, each cycle comprising a pulse phase and an arc breaking phase, the arc breaking phase comprising: In response to the end of the last pulse of the pulse stage, forward wire feeding causes the welding wire to extend into the molten pool; After the welding wire is extended into the molten pool, the wire is continuously fed forward for a first time; After the first time, the wire feeding is stopped so that the welding wire stays and keeps in contact with the molten pool; the welding wire stays for a second time; After the second time, the wire is reversely drawn to make the welding wire leave the molten pool so as to carry out the next welding cycle.

[0006] Optionally, the wire feeding speed in the pulse stage is 0-25m / min; the wire feeding speed when the forward wire feeding causes the welding wire to extend into the molten pool is 0-15m / min, and the wire drawing speed when the reverse wire drawing causes the welding wire to leave the molten pool is 5-50m / min.

[0007] Optionally, the calculation formula of the second time is: t2=bI0+c*f+d*K+m, Among them, t2 is the second time, b, c, d, m are coefficients, I0 is the pulse current; f is the frequency, and K is the duty cycle.

[0008] Optionally, after the second time, reversely drawing the wire to make the welding wire leave the molten pool to perform the next welding cycle includes: Reverse drawing for a third time causes the welding wire to leave the molten pool; After the welding wire leaves the molten pool, it continues to be drawn in the reverse direction for a fourth time; After the fourth time, the spinning is stopped, and the stopping of spinning continues for a fifth time; After the fifth time, the wire feeding speed is increased to a preset pulse wire feeding speed to enter the pulse stage of the next cycle.

[0009] Optionally, the first time is 10-200ms; the third time is 0-20ms; and the fourth time is 0-20ms.

[0010] Optionally, the fifth time is calculated as follows: t5=T B -(t1+t2+t3+t4) T B is the time of arc breaking stage, t1 is the first time, t2 is the second time, t3 is the third time, and t4 is the fourth time; Optionally, in response to the end of the last pulse of the pulse stage, the welding voltage is changed from the pulse voltage to the first voltage; When the welding wire extends into the molten pool, the welding voltage changes from the first voltage to the second voltage; When the welding wire leaves the molten pool, the welding voltage changes from the second voltage to the third voltage; The second voltage is lower than the first voltage; the second voltage is lower than the third voltage.

[0011] Optionally, in response to the end of the last pulse of the pulse stage, the welding current is changed from the pulse current to the first current; In response to the welding wire extending into the molten pool, the welding current is changed from a first current to a second current; In response to the wire feeding being stopped for a second time, the welding current is changed from the second current to a third current; The second current is smaller than the first current; and the second current is smaller than the third current.

[0012] Optionally, each time the wire feeding speed is adjusted, it changes linearly, and the slope of the linear change is 0.1-10.

[0013] In a second aspect, the present invention provides a welding machine, comprising: A memory for storing instructions; The processor is used to execute the instructions so that the welding machine performs operations to implement the welding control method.

[0014] Compared with the prior art, the invention has the following beneficial effects: the process of the welding wire extending into the molten pool and maintaining the molten pool ensures the stability of the molten pool, avoids vibration, and makes the fish scale pattern surface free of fine textures; at the same time, the welding wire can also dissipate heat for the molten pool, thereby achieving the purpose of reducing heat input. Overall, the welded fish scale pattern is clearer and more beautiful, the welding heat is lower, and it is suitable for welding occasions with high requirements for the appearance of thin plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Shown is a schematic diagram of the welding method in Example 1; DETAILED DESCRIPTION

[0016] It should be noted that: The technical solution of the present invention is described in detail below through the accompanying 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. The embodiments of the present invention and the technical features in the embodiments may be combined with each other unless there is a conflict.

[0017] The term "and / or" is only a description of the association relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " generally indicates that the related objects are in an "or" relationship. Example

[0018] This embodiment introduces a fish scale welding method, which includes a plurality of welding cycles, each cycle including a pulse stage and an arc breaking stage performed sequentially.

[0019] The pulse phase time T in each welding cycle A and the arc breaking stage time T B Determined according to the pre-acquired pulse parameters, for example: the pulse parameters include pulse current, frequency and duty cycle, the reciprocal of the frequency is the period, and the duty cycle refers to the proportion of pulse welding in a welding cycle. The specific calculation method can be determined according to existing technology or based on a large number of test results, and this embodiment does not make specific restrictions. The wire feeding speed V0 in the pulse stage remains unchanged, and V0 is determined according to the pulse current, and the calculation method is as follows: V0=aI0 Wherein a is the first coefficient, I0 is the pulse current; in a specific embodiment, the wire feeding speed V0 in the pulse stage is 0-25m / min; When the pulse welding reaches T A After the pulse stage, a welding control method involving wire feeding speed, welding current and welding voltage is performed, the method comprising: Step S1: In response to the end of the last pulse of the pulse stage, the welding wire is fed forward to extend into the molten pool.

[0020] After the welding wire is extended into the molten pool, a short circuit occurs, thereby extinguishing the arc and reducing the heat generation to calm the molten pool. In a specific embodiment, after the pulse stage is over, the welding voltage and welding current are adjusted to the determined first voltage U1 and first current I1 respectively, and the wire feeding speed is adjusted from V0 to the first speed V1 with an acceleration of k1. The forward wire feeding keeps the wire feeding speed at the first speed V1 when the welding wire is extended into the molten pool. In actual operation, the first speed V1 is 0-15m / min. Before the forward wire feeding wire is extended into the molten pool, the welding current is the first current I1, and the welding voltage is the first voltage U1. The first current I1 and the first voltage U1 are mainly used to maintain the burning of the arc, and can be lower values, and can be 0 in extreme cases. This embodiment does not make specific limitations.

[0021] Step S2: After the welding wire is inserted into the molten pool, the forward wire feeding is continued for a first time; the continuous wire feeding during the first time is to ensure that the welding wire is fully in contact with the molten pool, thereby achieving a better sedation effect. In a specific embodiment, the forward wire feeding makes the wire feeding speed when the welding wire is inserted into the molten pool be 0-15m / min, and the first time is 10-200ms.

[0022] Furthermore, after the welding wire is inserted into the molten pool, the welding voltage and welding current are both adjusted downward, the welding voltage is reduced from the first voltage U1 to the second voltage U2 by a preset value, and the welding current is reduced from the first current I1 to the second current I2 by a preset value; the purpose of such adjustment is to avoid high heat causing the welding wire to melt and affect the sedation effect. The preset values ​​of the welding voltage and welding current are all pre-set, and the specific values ​​can be determined based on a large number of tests, and are not specifically limited in this embodiment.

[0023] It is understandable that after the welding wire enters the molten pool, if the welding current and the welding voltage are relatively large, the high heat will cause more welding wire to be melted. Once the part of the welding wire extending into the molten pool is completely melted, a new arc will be formed to cause the welding wire to separate from the molten pool. If the welding wire separates from the molten pool, it will be difficult to achieve the effect of stabilizing the molten pool.

[0024] Step S3: stop feeding the wire after the first time t1, so that the welding wire stays and keeps in contact with the molten pool; the welding wire stays for a second time t2. In a specific embodiment, the first speed V1 decreases to zero with the acceleration of k2 to stop feeding the wire. Generally, k2 can be a linear adjustment with a constant slope, or a multi-stage adjustment with a variable slope. In a more specific embodiment, the slope of the linear adjustment is 0.1-10, which is not specifically limited in this embodiment.

[0025] The purpose of the wire dwell in this embodiment is to calm the molten pool continuously under the premise that the wire is in full contact with the molten pool, so as to avoid molten pool vibration, thereby ensuring the welding quality of fish scale pattern. The second time t2 in this embodiment cannot be too short or too long. In the actual welding process, if the second time t2 is too short, it will be difficult to calm the molten pool and reduce the heat input because the wire stays in the molten pool for too short a time; on the contrary, if the second time t2 is too long, the molten pool gradually cools down during the wire dwelling process, and the wire may stick to the molten pool and cause poor welding. Therefore, the second time t2 of the wire dwelling needs to be calculated by a certain formula to achieve the expected effect.

[0026] In a specific embodiment, the second time t2 is calculated by the following formula: t2=bI0+c*f+d*K+m Among them, t2 is the second time, b, c, d, m are the second coefficient, the third coefficient, the fourth coefficient and the fifth coefficient respectively, I0 is the pulse current; f is the frequency, and K is the duty cycle. The reciprocal of the frequency is the period, and the duty cycle refers to the proportion of pulse welding in a welding cycle.

[0027] In addition, the value of the second time t2 will be different for different types of welding workpieces. For example, the second time t2 can be set to different values ​​for plate thickness and material type. The heat dissipation effect of different plate thicknesses is different. The thicker the plate thickness, the better the heat dissipation, and the easier it is for the molten pool to cool. The value of the second time t2 needs to be set smaller. Different materials have different thermal conductivity and the cooling speed of the molten pool is also different. The faster the cooling speed, the shorter the setting time of the second time t2 needs to be, so as to avoid excessive cooling of the molten pool and cause the welding wire to stick to the molten pool. Therefore, the second time t2 for different plate thicknesses and material types is also different. In the actual process, the second coefficient, the third coefficient, the fourth coefficient and the fifth coefficient in the aforementioned second time t2 calculation formula can be adjusted according to the actual situation to adapt to different welding conditions.

[0028] Step S4: After the second time, the wire is reversely drawn to make the welding wire leave the molten pool for the next welding cycle. The reverse wire drawing causes the arc to reignite after the welding wire leaves the molten pool, and the molten pool no longer continues to cool, so as to facilitate the next welding cycle. In a specific embodiment, the wire drawing speed of the reverse wire drawing to make the welding wire leave the molten pool is 5-50m / min. The wire feeding speed after the second time is adjusted from zero to the acceleration of the reverse wire drawing, which is k3. The k3 can be a linear adjustment of a single slope or a multi-stage adjustment of multiple slopes. In a more specific embodiment, the slope of the linear adjustment is 0.1-10, which is not specifically limited in this embodiment.

[0029] And in step S4, when the welding wire leaves the molten pool, the welding voltage is adjusted up by a preset value from the second voltage U2 to the third voltage U3; the purpose of the welding voltage increase is to accelerate the arc re-ignition and provide heat to the molten pool as a transition before entering the next pulse stage. In addition, in response to the stop of wire feeding for the second time t2, the welding current is increased from the second current I2 to the third current I3, and the welding current is increased when the welding wire stay time reaches the second time t2, thereby accelerating the melting of the welding wire to re-form the arc so as to enter the next pulse stage.

[0030] In a specific embodiment, the step S4 specifically includes: step S41: reverse wire drawing for the third time t3 to make the welding wire leave the molten pool; step S42: continue reverse wire drawing for the fourth time t4 after the welding wire leaves the molten pool; step S43: stop wire drawing after the fourth time t4, and the stopping of wire drawing lasts for the fifth time t5; step S44: increase the wire feeding speed to the preset pulse wire feeding speed V0 after the fifth time to enter the pulse stage of the next cycle.

[0031] The third time and the fourth time are both preset, and the specific values ​​can be adjusted according to different welding conditions based on test adaptability. In a specific embodiment, the third time is 0-20ms; the fourth time is 0-20ms; and the calculation method of the fifth time is: t5=T B -(t1+t2+t3+t4) T B is the preset arc breaking stage time, t1 is the first time, t2 is the second time, t3 is the third time, and t4 is the fourth time.

[0032] In addition, the accelerator for reverse wire drawing until stopping in step S43 is k4, and the acceleration for increasing the wire feeding speed to the preset pulse wire feeding speed V0 is k5. Both k4 and k5 are pre-set, and the specific values ​​can be set according to the actual welding conditions, which are not specifically limited in this embodiment.

[0033] In this embodiment, welding is performed according to the above process. The process of the welding wire extending into the molten pool and maintaining the welding wire ensures the stability of the molten pool and avoids vibration, so that there is no fine texture on the fish scale surface; at the same time, the welding wire can also dissipate heat for the molten pool, thereby achieving the purpose of reducing heat input. Overall, the welded fish scale is clearer and more beautiful, and the welding heat is lower, which is suitable for welding occasions with high requirements for the appearance of thin plates. Example

[0034] Based on the same inventive concept as in Example 1, in one embodiment of the present application, the present application further discloses a welding machine, comprising: a memory for storing instructions; a processor for executing the instructions, so that the welding machine performs the operation of the welding control method of any of the above embodiments. The components of the welding machine may include, but are not limited to: the above at least one processor, the above at least one memory, and a bus connecting different system components (including the memory and the processor). Among them, the processor may be connected to the welding part of the welding machine, and the welding part is used to generate heat in response to the welding current output by the processor to achieve welding of the workpiece.

[0035] The memory stores program codes, which can be executed by the processor, so that the processor performs the steps of various exemplary embodiments of the present invention described in the above "Exemplary Method" section of this specification. For example, the processor can perform the following steps: Figure 1 The steps shown. The memory may include a readable medium in the form of a volatile memory, such as a random access memory (RAM) and / or a cache memory, and may further include a read-only memory (ROM). The memory may also include a program / utility having a set (at least one) of program modules, such program modules including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of these examples or some combination may include the implementation of a network environment. The bus may represent one or more of several types of bus structures, including a memory bus or a memory controller, a peripheral bus, a graphics acceleration port, a processing unit, or a local bus using any of a variety of bus structures.

[0036] The welder may also communicate with one or more external devices (e.g., keyboards, pointing devices, Bluetooth devices, etc.), one or more devices that enable a user to interact with the welder, and / or any device that enables the welder to communicate with one or more other computing devices (e.g., routers, modems, etc.). Such communication may be performed via an input / output (I / O) interface. Furthermore, the welder may also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) via a network adapter. The network adapter communicates with other modules of the welder via a bus.

[0037] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0038] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes 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 a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0039] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0040] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0041] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the protection of the present invention.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A fish scale welding method, characterized in that: The method comprises a plurality of welding cycles, each cycle comprising a pulse phase and an arc breaking phase, wherein the arc breaking phase comprises: In response to the end of the last pulse of the pulse stage, forward wire feeding causes the welding wire to extend into the molten pool; After the welding wire is extended into the molten pool, the wire is continuously fed forward for a first time; After the first time, the wire feeding is stopped so that the welding wire stays and keeps in contact with the molten pool; the welding wire stays for a second time; After the second time, the wire is reversely drawn to make the welding wire leave the molten pool so as to carry out the next welding cycle.

2. The fish scale welding method according to claim 1, characterized in that: The wire feeding speed in the pulse stage is 0-25 m / min; the wire feeding speed when the forward wire feeding makes the welding wire extend into the molten pool is 0-15 m / min, and the wire drawing speed when the reverse wire drawing makes the welding wire leave the molten pool is 5-50 m / min.

3. The fish scale welding method according to claim 1, characterized in that: The calculation formula of the second time is: t2=bI0+c*f+d*K+m, Among them, t2 is the second time, b, c, d, m are coefficients, I0 is the pulse current; f is the frequency, and K is the duty cycle.

4. The fish scale welding method according to claim 3, characterized in that: After the second time, reverse wire drawing makes the welding wire leave the molten pool to carry out the next welding cycle, which includes: Reverse drawing for a third time causes the welding wire to leave the molten pool; After the welding wire leaves the molten pool, it continues to be drawn in the reverse direction for a fourth time; After the fourth time, the spinning is stopped, and the stopping of spinning continues for a fifth time; After the fifth time, the wire feeding speed is increased to a preset pulse wire feeding speed to enter the pulse stage of the next cycle.

5. The fish scale welding method according to claim 4, characterized in that: The first time is 10-200ms; the third time is 0-20ms; and the fourth time is 0-20ms.

6. The fish scale welding method according to claim 5, characterized in that: The calculation method of the fifth time is: t5=T B -(t1+t2+t3+t4) T B is the time of the arc breaking stage, t1 is the first time, t2 is the second time, t3 is the third time, and t4 is the fourth time.

7. The fish scale welding method according to claim 1, characterized in that: In response to the end of the last pulse of the pulse stage, the welding voltage is changed from the pulse voltage to the first voltage; When the welding wire extends into the molten pool, the welding voltage changes from the first voltage to the second voltage; When the welding wire leaves the molten pool, the welding voltage changes from the second voltage to the third voltage; The second voltage is lower than the first voltage; the second voltage is lower than the third voltage.

8. The fish scale welding method according to claim 1, characterized in that: In response to the end of the last pulse of the pulse stage, the welding current is changed from the pulse current to the first current; In response to the welding wire extending into the molten pool, the welding current is changed from a first current to a second current; In response to the wire feeding being stopped for a second time, the welding current is changed from the second current to a third current; The second current is smaller than the first current; and the second current is smaller than the third current.

9. The fish scale welding method according to claim 1, characterized in that: Each time the wire feeding speed is adjusted, it changes linearly, and the slope of the linear change is 0.1-10.

10. A welding machine, characterized in that: include: A memory for storing instructions; The processor is used to execute the instruction so that the welding machine performs the operation of implementing the welding control method as described in any one of claims 1 to 9.

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