CN108176915B - Multi-state double-wire welding device and arc starting control method of multi-state double-wire welding device - Google Patents
Multi-state double-wire welding device and arc starting control method of multi-state double-wire welding device Download PDFInfo
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- CN108176915B CN108176915B CN201711305494.4A CN201711305494A CN108176915B CN 108176915 B CN108176915 B CN 108176915B CN 201711305494 A CN201711305494 A CN 201711305494A CN 108176915 B CN108176915 B CN 108176915B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/06—Arrangements or circuits for starting the arc, e.g. by generating ignition voltage, or for stabilising the arc
- B23K9/067—Starting the arc
- B23K9/0671—Starting the arc by means of brief contacts between the electrodes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
Abstract
The invention discloses a multi-state double-wire welding device and an arc starting control method thereof, wherein the device comprises a welding gun, a power supply, a main control circuit, a wire feeding circuit and a full-bridge inverter circuit, wherein the welding gun is used for installing a first welding wire and a second welding wire; the full-bridge inverter circuit correspondingly adjusts welding wire current and welding current of the first welding wire and the second welding wire according to the current output by the power supply under the control of the main control circuit; when the main control circuit receives a welding instruction, the main control circuit controls the power supply to output to a first welding wire and controls the wire feeding circuit to feed the first welding wire to a workpiece, so that the first welding wire is ignited to form an ionization region when contacting the workpiece; after the first welding wire is determined to be stable in arcing, controlling the wire feeding circuit to feed a second welding wire to the workpiece, and enabling the second welding wire to be in contact with an ionization region of the first welding wire to form an ionization loop; and when the second power supply current is determined to be constant, switching the power supply to output to the second welding wire and igniting the second welding wire to finish the double-wire arcing action. The invention avoids the problem of explosion of the welding wire in the process of arc striking of the welding wire.
Description
Technical Field
The invention relates to the field of automatic welding, in particular to a multi-state double-wire welding device and an arc starting control method of the multi-state double-wire welding device.
Background
The multi-state double-wire welding device is a welding mode with low heat input and high deposition rate, is particularly suitable for the high-end automatic welding field, can improve the welding efficiency under the same power platform, and has strong market competitiveness.
The existing multi-state double-wire welding device consists of a welding machine and a power supply part, as shown in figure 1, wherein the welding machine is provided with two welding guns 4-1 and 4-2, the power supply part mainly comprises two power supplies 1 and 2, a main control circuit, a wire feeding circuit and a full-bridge inverter circuit, wherein the two power supplies output power supply signals with the phase difference of 180 degrees, and the full-bridge inverter circuit outputs the two power supplies to the welding guns under the control of the main control circuit so as to heat and ignite welding wires 6-1 and 6-2, which is also called as arcing; the wire feeding circuit drives the welding gun to perform welding action under the control of the main control circuit so as to realize welding with the workpiece 7. It should be noted that the arcing effect is a very important index in the field of automated welding, and determines the quality of the welded workpiece after forming.
The existing multi-state double-wire welding device has poor arc starting effect, the welding wire can normally work after multiple times of explosion breaking of the welding wire occur during each arc starting, the working process of the arc starting and the explosion breaking is shown in a figure 2, and when the multi-state double-wire welding device works, two wires simultaneously send wires such as Step 1; by checking the working equivalent circuit (figure 1) of the device, the L1 and the L2 are respectively and independently connected with different power supplies 1 and 2, the phase difference of the two power supplies is 180 degrees, after the welding wire contacts the workpiece 7, like Step 2, L1 forms a loop, and a large current I1 flows through the loop, and simultaneously, as the two welding wires 6-1 and 6-2 are short-circuited through the workpiece 7, the power supply between the two welding wires 6-1 and 6-2 works to form a current Im; the current at L1 is now equal to I1+ Im; due to the excessive current on L1, the wire pops off the arc such as Step 3; when the power supplies at the two ends of the L2 work after the phase change of the power supplies, the instantaneous energy on the L2 is still too large, and therefore, the arc striking can be also broken.
Disclosure of Invention
The invention mainly aims to provide a multi-state double-wire welding device and an arc striking control method of the multi-state double-wire welding device, and aims to solve the problem that a welding wire is broken in the arc striking process of the welding wire.
In order to achieve the above object, the present invention provides a multi-state twin-wire welding device, which comprises a welding gun, a first power supply, a second power supply, a main control circuit, a wire feeding circuit and a full-bridge inverter circuit, wherein the welding gun is used for mounting a first welding wire and a second welding wire; the master control circuit is used for controlling the bridge arm switching state of the full-bridge inverter circuit; the full-bridge inverter circuit is used for correspondingly adjusting the welding wire current and the welding current of the first welding wire and the second welding wire according to the currents output by the first power supply and the second power supply under the control of the main control circuit; the wire feeding circuit drives the welding gun to feed wires to the workpiece under the control of the main control circuit so as to weld the workpiece;
the master control circuit is configured to:
when a welding instruction is received, controlling a first power supply to output power to a first welding wire, and controlling the first welding wire to perform wire feeding operation on a workpiece, so that the first welding wire is ignited when being in contact with the workpiece, and an ionization region is formed;
after the first welding wire is determined to be stable in arcing, controlling the wire feeding circuit to perform wire feeding operation on a second welding wire to the workpiece, and enabling the second welding wire to be in contact with an ionization region of the first welding wire to form an ionization loop;
and when the second power supply current is determined to be constant, switching the power supply output to the first welding wire to output to the second welding wire so as to ignite the second welding wire and finish the double-wire arcing action.
Preferably, the first power supply is a constant voltage dc power supply, and the second power supply is a constant current dc power supply.
Preferably, the number of the welding guns is two, and the welding guns are respectively a first welding gun provided with the first welding wire and a second welding gun provided with the second welding wire; the full-bridge inverter circuit comprises a first upper bridge arm electronic switch, a first lower bridge arm electronic switch, a second upper bridge arm electronic switch and a second lower bridge arm electronic switch, wherein the first ends of the first upper bridge arm electronic switch and the second upper bridge arm electronic switch are connected with the anode of the constant-voltage direct-current power supply and the anode of the constant-current direct-current power supply; the second end of the first upper bridge arm electronic switch and the first end of the first lower bridge arm electronic switch are interconnected and are connected with a first welding gun; the second end of the second upper bridge arm electronic switch and the first end of the second lower bridge arm electronic switch are interconnected and are connected with a second welding gun; the second ends of the second upper bridge arm electronic switch and the second lower bridge arm electronic switch are connected with the negative electrode of the constant-voltage direct-current power supply; the controlled ends of the first upper bridge arm electronic switch, the first lower bridge arm electronic switch, the second upper bridge arm electronic switch and the second lower bridge arm electronic switch are all connected with the master control circuit; the cathode of the constant-current direct-current power supply is connected with a welding workpiece;
the step of controlling the first power supply to output power to the first welding wire is specifically as follows:
controlling the first upper bridge arm electronic switch and the second lower bridge arm electronic switch to be turned on, and controlling the second upper bridge arm electronic switch and the first lower bridge arm electronic switch to be turned off;
the switching of the power supply output to the first welding wire to the second welding wire is specifically as follows:
and controlling the first upper bridge arm electronic switch and the second lower bridge arm electronic switch to be turned off, and controlling the second upper bridge arm electronic switch and the first lower bridge arm electronic switch to be turned on.
Preferably, the main control circuit is configured to determine that the first welding wire is stable in arcing specifically:
and detecting the voltage of the first power supply, and determining that the first welding wire is stable in arcing when the voltage of the first power supply is determined to be in a preset voltage interval.
Preferably, the determining that the second power supply current is constant specifically includes:
and detecting the current of the second power supply, and determining that the current of the second power supply is constant when the current of the second power supply is determined to be in a preset current interval.
Preferably, the main control circuit is used for controlling the speed of the second welding wire to perform wire feeding operation on the workpiece to be more than 1.5 meters per minute and less than 24 meters per minute.
In order to achieve the above object, the present invention further provides an arc starting control method for a multi-state twin-wire welding apparatus, including the steps of:
preparing a first welding wire and a second welding wire on a welding gun of the multi-state double-wire welding device;
when the multi-state double-wire welding device receives a welding instruction, outputting a power supply to a first welding wire, and controlling the first welding wire to perform wire feeding operation on a workpiece, so that the first welding wire is ignited when contacting the workpiece, and an ionization region is formed;
after the first welding wire is determined to be stable in arcing, controlling a second welding wire to perform wire feeding operation on the workpiece, and enabling the second welding wire to be in contact with an ionization region of the first welding wire to form an ionization loop;
and when the power supply current is determined to be constant, switching the power supply output to the first welding wire to output to the second welding wire so as to ignite the second welding wire and finish the double-wire arcing action.
Preferably, the determining that the first welding wire is stable includes:
and when the power supply voltage of the multi-state double-wire welding device is determined to be in a preset voltage interval, determining that the first welding wire is stable in arcing.
Preferably, the determining that the power supply current is constant specifically includes:
and when the power supply current of the multi-state double-wire welding device is determined to be in a preset current interval, determining that the power supply current is constant.
Preferably, the controlling the second welding wire to perform the wire feeding operation to the workpiece includes:
and controlling a second welding wire to perform wire feeding operation on the workpiece at a first preset speed, wherein the first preset speed is greater than 1.5 m/min and less than 24 m/min.
When welding, firstly, controlling a first power supply to output power to a first welding wire, and then controlling the first welding wire to perform wire feeding operation on a workpiece, so that the first welding wire is ignited when contacting the workpiece, and an ionization region is formed; and after the first welding wire is determined to be stable in arc burning, controlling the second welding wire to perform wire feeding operation on the workpiece, enabling the second welding wire to be in contact with an ionization region of the first welding wire to form an ionization loop, and switching and outputting a power supply output to the first welding wire to the second welding wire when the second power supply current is determined to be constant so as to ignite the second welding wire and finish the double-wire arc starting action. So, at the in-process of arcing, avoided two welding wires simultaneously with the work piece contact and produce great uncontrollable short-circuit current in the twinkling of an eye, just so avoided the in-process of welding wire arcing to appear the problem that the welding wire explodes absolutely.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic equivalent circuit diagram of a prior art multi-state twin-wire welding apparatus;
FIG. 2 is a schematic view of a prior art welding arc starting step of a multi-state twin-wire welding apparatus;
FIG. 3 is a functional block diagram of the multi-state twin wire welding apparatus of the present invention;
FIG. 4 is a schematic diagram of the electrical circuit configuration of the multi-state twin-wire bonding apparatus of the present invention;
FIG. 5 is a schematic view of a welding arc starting step of the multi-state twin-wire welding apparatus of the present invention;
FIG. 6 is a schematic flow chart of an arc starting control method of the multi-state twin-wire welding device.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a multi-state double-wire welding device which is mainly used for solving the problem that a welding wire is frequently broken in an arc striking stage in a welding process.
Referring to fig. 3-5, in one embodiment, the multi-state twin-wire welding apparatus includes: the welding gun comprises a welding gun 50, a first power supply 100, a second power supply 200, a main control circuit 300, a wire feeding circuit 400 and a full-bridge inverter circuit 500, wherein the welding gun 50 is used for installing a first welding wire L1 and a second welding wire L2; the main control circuit 300 is configured to control a bridge arm switching state of the full-bridge inverter circuit 500; the full-bridge inverter circuit 500 is used for correspondingly adjusting the welding wire current and the welding current of the first welding wire L1 and the second welding wire L2 according to the current output by the first power supply 100 and the second power supply 200 under the control of the main control circuit 300; the wire feeding circuit 400 drives the welding gun 50 to feed wire to the workpiece 700 under the control of the main control circuit 300, so as to weld the workpiece 700. The welding guns 50 are two in number, and are a first welding gun for mounting the first welding wire L1 and a second welding gun for mounting the second welding wire L2, respectively.
In this embodiment, the main control circuit 300 is configured to: upon receiving a welding command, controlling the first power source 100 to output power to the first welding wire L1 and controlling the first welding wire L1 to perform a wire feeding operation to the workpiece 700 such that the first welding wire L1 ignites upon contact with the workpiece 700 and an ionization region is formed; after the first welding wire L1 is determined to be stable in arcing, the second welding wire L2 is controlled to perform a wire feeding operation on the workpiece 700, and the second welding wire L2 is in contact with the ionization region of the first welding wire L1 to form an ionization loop; when the current of the second power source 200 is determined to be constant, the power source output to the first welding wire L1 is switched to be output to the second welding wire L2 to ignite the second welding wire L2, and the double-wire arcing action is completed, wherein the time of the power source output to the first welding wire L1 is the same as the time of the power source output to the first welding wire L1, namely, the phase of the power source output to the first welding wire L1 is 180 degrees different from that of the power source output to the second welding wire L2 in the same known period.
Specifically, as will be described in detail below with reference to fig. 4, first, two welding wires L1 and L2 are prepared on the welding gun 50, and in the initial state shown in fig. 4, one welding wire L1, e.g., Step 1, is fed first, so that the welding wire L1 is short-circuited with the workpiece 700 to generate a large current I1, and the welding wire L1 is ignited, and at this time, the welding wires L2 and L1 cannot form a loop, so that there is no Im current, e.g., Step 2. Then, by controlling the I1 current to make the L1 enter a stable arcing state, and then feeding the L2 welding wire to the workpiece 700, a low speed, such as Step 3, can be used, when the welding wire contacts the arc formed by the L1, the L1 and the L2 can form an ionization loop, at this time, Im current is formed, and the ionization loop has a much larger impedance than a short circuit loop, therefore, the Im current is easy to control, a large current without overshoot is generated to blow off the welding wire, at this time, after the second power source 200 current is constant, the power source output to the first welding wire L1 is switched and output to the second welding wire L2 to ignite the second welding wire L2, so that double-wire welding arcing is realized, which is also called as a double-wire three-arc welding process. It can be understood that, in the process of arc striking, the problem that the welding wire is broken in the process of arc striking is avoided because two welding wires are simultaneously contacted with the workpiece 700 to generate large uncontrollable short-circuit current instantly.
In an alternative embodiment, the first power source 100 is a constant voltage dc power source, and the second power source 200 is a constant current dc power source, so as to improve the welding stability and improve the arcing effect.
In this embodiment, optionally, the full-bridge inverter circuit 500 includes a first upper bridge arm electronic switch K1, a first lower bridge arm electronic switch K3, a second upper bridge arm electronic switch K2, and a second lower bridge arm electronic switch K4, where first ends of the first upper bridge arm electronic switch K1 and the second upper bridge arm electronic switch K2 are both connected to the positive electrode of the constant-voltage dc power supply and the positive electrode of the constant-current dc power supply; the second end of the first upper bridge arm electronic switch K1 and the first end of the first lower bridge arm electronic switch K3 are interconnected and are both connected with a first welding gun 50; the second end of the second upper bridge arm electronic switch K2 and the first end of the second lower bridge arm electronic switch K4 are interconnected and are both connected with a second welding gun 50; the second ends of the second upper bridge arm electronic switch K2 and the second lower bridge arm electronic switch K4 are both connected with the negative electrode of the constant-voltage direct-current power supply; the controlled ends of the first upper bridge arm electronic switch K1, the first lower bridge arm electronic switch K3, the second upper bridge arm electronic switch K2 and the second lower bridge arm electronic switch K4 are all connected with the main control circuit 300; the negative electrode of the constant current dc power supply is connected to the welding workpiece 700.
In this embodiment, the controlling the first power source 100 to output power to the first welding wire L1 specifically includes: and controlling the first upper bridge arm electronic switch K1 and the second lower bridge arm electronic switch K4 to be opened, and controlling the second upper bridge arm electronic switch K2 and the first lower bridge arm electronic switch K3 to be turned off. When the first upper arm electronic switch K1 and the second lower arm electronic switch K4 are turned on, the first power source 100 outputs power to the first bonding wire L1.
In this embodiment, the switching the power output to the first bonding wire L1 to the second bonding wire L2 specifically includes: and controlling the first upper bridge arm electronic switch K1 and the second lower bridge arm electronic switch K4 to be turned off, and controlling the second upper bridge arm electronic switch K2 and the first lower bridge arm electronic switch K3 to be turned on. When the first upper arm electronic switch K1 and the second lower arm electronic switch K4 are turned off, the power supply to the first bonding wire L1 is cut off, and when the second upper arm electronic switch K2 and the first lower arm electronic switch K3 are turned on, the power supply from the first power supply 100 is supplied to the second bonding wire L2.
The arcing control principle based on the present embodiment is that when the welding machine is working, the welding wire L1 is fed first through the wire feeding circuit 400, and the first power source 100 and the second power source 200 are pulsed simultaneously, and the switches K1 and K4 are turned on. When the L1 wire contacts the workpiece, the first power supply 100 forms a loop, which arcs the L1 wire similar to the normal gas shield welding operation, and the second power supply 200 has no output because the L1 and the L2 fail to form a loop. When the L1 welding wire is detected to be stable in arcing, the wire feeding circuit 400 controls the L2 welding wire to feed, and the second power source 200 forms a loop when the L2 welding wire penetrates into the L1 arc, so that an M arc is generated between the two wires. When the second power source 200 detects a steady current, the system can be considered to be in steady operation, and at this time, the switches K2 and K3 can be controlled to be turned on, and the switches K1 and K4 are turned off, that is, the first power source 100 is switched to supply power to the welding wire L2, so that the welding wire L2 is arcing, and thus, double-wire arcing is realized.
In this embodiment, optionally, the main control circuit 300 is configured to determine that the first welding wire L1 is stable in arcing specifically as:
the voltage of the first power source 100 is detected, and when it is determined that the voltage of the first power source 100 is in the preset voltage interval, it is determined that the arc of the first welding wire L1 is stable. It should be noted that the arc length is proportional to the voltage, and the arc striking length can be known by detecting the voltage of the first power supply 100, so as to further determine whether the arc is stable. Wherein the preset voltage interval corresponds to the approximate length of the striking arc when the striking arc is stable.
In this embodiment, optionally, the second power supply 200 with a constant current specifically includes:
the current of the second power source 200 is detected, and when it is determined that the current of the second power source 200 is in the preset current interval, the current of the second power source 200 is constant. It can be understood that when the second welding wire L2 is in the ionization region formed by the arcing of the first welding wire L1, a current is formed on the second welding wire L2, and since the second power supply 200 is a constant current power supply, after the arcing is stabilized, the current is not influenced by the arcing fluctuation any more, the current of the second power supply 200 gradually tends to be constant, and at the moment, the arcing of the second welding wire L2 is controlled, the current is easy to control, and the arc can not be broken. Wherein the preset voltage interval corresponds to the current of the second power supply 200 when the arc is stable.
In this embodiment, optionally, the main control circuit 300 is configured to control the second welding wire L2 to perform the wire feeding operation on the workpiece 700 at a speed greater than 1.5 m/min and less than 24 m/min. As the speed becomes slower, the current becomes more stable and the second wire L2 is less likely to explode and strike the arc when it approaches the ionization region of the first wire L1.
The invention also provides an arc starting control method of the multi-state double-wire welding device, wherein the multi-state double-wire welding device can be a hardware part of the multi-state double-wire welding device, and can also be a multi-state double-wire welding device with other different hardware structures, and the invention is not limited in the embodiment.
Referring to fig. 3 to 6, in an embodiment, the arc starting control method of the multi-state twin-wire welding device comprises the following steps:
step S10, preparing a first welding wire L1 and a second welding wire L2 on the welding gun 50 of the multi-state twin-wire welding device;
step S20, outputting power to the first welding wire L1 by the multi-state double-wire welding device when receiving a welding instruction, and controlling the first welding wire L1 to perform wire feeding operation on the workpiece 700, so that the first welding wire L1 is ignited when contacting the workpiece 700, and an ionization region is formed;
step S30, after the first welding wire L1 is determined to be stable in arcing, the second welding wire L2 is controlled to perform wire feeding operation on the workpiece 700, and the second welding wire L2 is made to contact with the ionization region of the first welding wire L1 to form an ionization loop;
and step S40, when the power current is determined to be constant, switching the power output to the first welding wire L1 to output to the second welding wire L2 to ignite the second welding wire L2, and completing the double-wire arcing action.
In this embodiment, the power output to the first wire L1 is the same as the power output to the first wire L1, i.e., the power output to the first wire L1 and the power output to the second wire L2 are different in phase by 180 degrees in the same known period.
Specifically, as will be described in detail below with reference to fig. 2, first, two welding wires L1 and L2 are prepared on the welding gun 50, and in an initial state shown in fig. 2, one welding wire L1, e.g., Step 1, is fed first, so that the welding wire L1 is short-circuited with the workpiece 700 to generate a large current I1, and the welding wire L1 is ignited, and at this time, the welding wires L2 and L1 cannot form a loop, so that there is no Im current, e.g., Step 2. Then, by controlling the I1 current to make the L1 enter a stable arcing state, and then feeding the L2 welding wire to the workpiece 700, a low speed, such as Step 3, can be used, when the welding wire contacts the arc formed by the L1, the L1 and the L2 can form an ionization loop, at this time, Im current is formed, and the ionization loop has a much larger impedance than a short circuit loop, therefore, the Im current is easy to control, a large current without overshoot is generated to blow off the welding wire, at this time, after the second power source 200 current is constant, the power source output to the first welding wire L1 is switched and output to the second welding wire L2 to ignite the second welding wire L2, so that double-wire welding arcing is realized, which is also called as a double-wire three-arc welding process. It can be understood that, in the process of arc striking, the problem that the welding wire is broken in the process of arc striking is avoided because two welding wires are simultaneously contacted with the workpiece 700 to generate large uncontrollable short-circuit current instantly.
In this embodiment, optionally, the determining that the first welding wire L1 is stable in arcing specifically includes:
when the power supply voltage of the multi-state twin-wire welding device is determined to be in the preset voltage interval, the first welding wire L1 is determined to be stable in arcing. It should be noted that the arc length is proportional to the voltage, and the arc striking length can be known by detecting the voltage of the first power supply 100, so as to further determine whether the arc is stable. Wherein the preset voltage interval corresponds to the approximate length of the striking arc when the striking arc is stable.
In this embodiment, optionally, the determining that the power supply current is constant specifically includes:
and when the power supply current of the multi-state double-wire welding device is determined to be in a preset current interval, determining that the power supply current is constant. It can be understood that when the second welding wire L2 is in the ionization region formed by the arcing of the first welding wire L1, a current is formed on the second welding wire L2, and since the second power supply 200 is a constant current power supply, after the arcing is stabilized, the current is not influenced by the arcing fluctuation any more, the current of the second power supply 200 gradually tends to be constant, and at the moment, the arcing of the second welding wire L2 is controlled, the current is easy to control, and the arc can not be broken. Wherein the preset voltage interval corresponds to the current of the second power supply 200 when the arc is stable.
In an alternative embodiment, the controlling the second welding wire L2 to perform the wire feeding operation on the workpiece 700 includes:
the second welding wire L2 is controlled to perform a wire feeding operation to the workpiece 700 at a first preset speed, which is greater than 1.5 m/min and less than 24 m/min. Note that, as the speed is lower, the current becomes more stable and the explosion arc is less likely to occur when the second wire L2 approaches the ionization region of the first wire L1.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A multi-state double-wire welding device is characterized by comprising a welding gun, a first power supply, a second power supply, a main control circuit, a wire feeding circuit and a full-bridge inverter circuit, wherein the welding gun is used for mounting a first welding wire and a second welding wire; the master control circuit is used for controlling the bridge arm switching state of the full-bridge inverter circuit; the full-bridge inverter circuit is used for correspondingly adjusting the welding wire current and the welding current of the first welding wire and the second welding wire according to the currents output by the first power supply and the second power supply under the control of the main control circuit; the wire feeding circuit drives the welding gun to feed wires to the workpiece under the control of the main control circuit so as to weld the workpiece;
the master control circuit is configured to:
when a welding instruction is received, controlling a first power supply to output power to a first welding wire, and controlling a wire feeding circuit to perform wire feeding operation on the first welding wire to a workpiece, so that the first welding wire is ignited when contacting the workpiece, and an ionization region is formed;
after the first welding wire is determined to be stable in arcing, controlling the wire feeding circuit to perform wire feeding operation on a second welding wire to the workpiece, and enabling the second welding wire to be in contact with an ionization region of the first welding wire to form an ionization loop;
when the second power supply current is determined to be constant, switching the power supply output to the first welding wire to output to the second welding wire so as to ignite the second welding wire and complete the double-wire arcing action;
the first power supply is a constant-voltage direct-current power supply, and the second power supply is a constant-current direct-current power supply;
the main control circuit is used for determining that the first welding wire is stable in arcing:
and detecting the voltage of the first power supply, and determining that the first welding wire is stable in arcing when the voltage of the first power supply is determined to be in a preset voltage interval.
2. A multi-state twin-wire welding apparatus according to claim 1, wherein the number of welding guns is two, and is a first welding gun that mounts the first welding wire and a second welding gun that mounts the second welding wire, respectively; the full-bridge inverter circuit comprises a first upper bridge arm electronic switch, a first lower bridge arm electronic switch, a second upper bridge arm electronic switch and a second lower bridge arm electronic switch, wherein the first ends of the first upper bridge arm electronic switch and the second upper bridge arm electronic switch are connected with the anode of the constant-voltage direct-current power supply and the anode of the constant-current direct-current power supply; the second end of the first upper bridge arm electronic switch and the first end of the first lower bridge arm electronic switch are interconnected and are connected with a first welding gun; the second end of the second upper bridge arm electronic switch and the first end of the second lower bridge arm electronic switch are interconnected and are connected with a second welding gun; the second ends of the second upper bridge arm electronic switch and the second lower bridge arm electronic switch are connected with the negative electrode of the constant-voltage direct-current power supply; the controlled ends of the first upper bridge arm electronic switch, the first lower bridge arm electronic switch, the second upper bridge arm electronic switch and the second lower bridge arm electronic switch are all connected with the master control circuit; the cathode of the constant-current direct-current power supply is connected with a welding workpiece;
the step of controlling the first power supply to output power to the first welding wire is specifically as follows:
controlling the first upper bridge arm electronic switch and the second lower bridge arm electronic switch to be turned on, and controlling the second upper bridge arm electronic switch and the first lower bridge arm electronic switch to be turned off;
the switching of the power supply output to the first welding wire to the second welding wire is specifically as follows:
and controlling the first upper bridge arm electronic switch and the second lower bridge arm electronic switch to be turned off, and controlling the second upper bridge arm electronic switch and the first lower bridge arm electronic switch to be turned on.
3. A multi-state twin-wire welding apparatus as set forth in claim 1 wherein said determining that the second supply current is constant specifically comprises:
and detecting the current of the second power supply, and determining that the current of the second power supply is constant when the current of the second power supply is determined to be in a preset current interval.
4. A multi-state twin wire welding apparatus as defined in any one of claims 1 to 3 wherein said main control circuit is configured to control the second welding wire to perform a wire feed operation on the workpiece at a speed greater than 1.5 meters per minute and less than 24 meters per minute.
5. The arc starting control method of the multi-state double-wire welding device is characterized by comprising the following steps of:
preparing a first welding wire and a second welding wire on a welding gun of the multi-state double-wire welding device;
when the multi-state double-wire welding device receives a welding instruction, outputting a power supply to a first welding wire, and controlling the first welding wire to perform wire feeding operation on a workpiece, so that the first welding wire is ignited when contacting the workpiece, and an ionization region is formed;
after the first welding wire is determined to be stable in arcing, controlling a second welding wire to perform wire feeding operation on the workpiece, and enabling the second welding wire to be in contact with an ionization region of the first welding wire to form an ionization loop;
when the power supply current is determined to be constant, switching the power supply output to the first welding wire to output to the second welding wire so as to ignite the second welding wire and finish the double-wire arcing action;
the determining that the first welding wire is stable includes:
and when the power supply voltage of the multi-state double-wire welding device is determined to be in a preset voltage interval, determining that the first welding wire is stable in arcing.
6. The method for arc starting control of a multi-state twin-wire welding apparatus according to claim 5, wherein said determining that the power supply current is constant specifically comprises:
and when the power supply current of the multi-state double-wire welding device is determined to be in a preset current interval, determining that the power supply current is constant.
7. The arc starting control method of the multi-state twin wire welding apparatus according to claim 5 or 6, wherein said controlling the second welding wire to perform a wire feeding operation to the workpiece comprises:
and controlling a second welding wire to perform wire feeding operation on the workpiece at a first preset speed, wherein the first preset speed is greater than 1.5 m/min and less than 24 m/min.
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| JP5489274B2 (en) * | 2010-02-22 | 2014-05-14 | 株式会社神戸製鋼所 | Arc start method for multi-electrode single-side welding apparatus and multi-electrode single-side welding apparatus |
| CN102248253A (en) * | 2011-06-23 | 2011-11-23 | 山东奥太电气有限公司 | Arc ignition cooperation control method for twin-wire welding device system |
| AT512836B1 (en) * | 2012-03-29 | 2014-02-15 | Fronius Int Gmbh | Welding device with two welding torches and welding process with two welding processes |
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