CN113333913B - Residence state arc striking method for gas metal arc welding - Google Patents
Residence state arc striking method for gas metal arc welding Download PDFInfo
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- CN113333913B CN113333913B CN202110634256.8A CN202110634256A CN113333913B CN 113333913 B CN113333913 B CN 113333913B CN 202110634256 A CN202110634256 A CN 202110634256A CN 113333913 B CN113333913 B CN 113333913B
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- arc
- wire feeding
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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
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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
- B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
- B23K9/133—Means for feeding electrodes, e.g. drums, rolls, motors
-
- 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
- B23K9/16—Arc welding or cutting making use of shielding gas
Abstract
The invention provides a residence state arc striking method for gas metal arc welding, which comprises the following steps: starting a power supply and starting wire feeding, wherein the wire feeding speed is in a slow wire feeding state, and waiting for a welding wire to contact a workpiece; detecting a contact workpiece, and immediately stopping wire feeding; the power supply starts to output arc striking current pulses to establish electric arcs; the wire feed speed is initiated after a fixed time until the arc and wire feed speed are normal operating conditions. The resident arc striking method for gas metal arc welding can achieve the effect of improving the success rate of arc striking under the condition of not improving the requirement of a motor.
Description
Technical Field
The invention relates to a residence state arc striking method for gas metal arc welding, which is applied to the technical field of gas metal arc welding.
Background
The arc starting method of the traditional gas metal arc welding (hereinafter referred to as 'gas shielded welding'): before establishing electric arc, a welding power supply is started in advance, the voltage reaches no-load voltage, generally dozens of volts, and then wire feeding is started; at the moment, the wire feeding speed is low, when the welding wire slowly reaches a workpiece and short circuit occurs, the current suddenly changes, arc striking is successfully established under the default condition, and then the wire feeding speed is changed into the normal wire feeding speed; if the arc is not successfully established, the starting state of the power supply is maintained, the wire feeding speed still returns to the 'slow wire feeding' state, and the arc striking is carried out again until the arc striking is successful.
In recent years, gas shielded welding has appeared a method called 'drawing wire arc striking', which is adopted in arc striking control of welding as early as decades ago, is frequently seen in foreign products, and has a history of decades in domestic submerged arc automatic welding equipment.
At present, the arc striking success rate becomes an important index of gas shielded welding products, and nowadays, a multi-arc cooperative work system is generally adopted in digitalized and large-scale production, so that a higher requirement is provided for the arc striking success rate.
Therefore, there is a need for a new method of dwell arc initiation for gas metal arc welding to overcome the above-mentioned problems.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a resident arc striking method for gas metal arc welding, which realizes the effect of improving the success rate of arc striking under the condition of not improving the requirement of a motor (not adopting a drawing wire to strike the arc).
The invention is realized by the following steps:
a dwell-state arc striking method for gas metal arc welding comprises the following steps:
the method comprises the following steps: starting a power supply and starting wire feeding, wherein the wire feeding speed is in a slow wire feeding state, and waiting for a welding wire to contact a workpiece;
step two: detecting the contact of the workpieces, and immediately stopping feeding the wires;
step three: the power supply starts to output arc striking current pulses to establish an electric arc;
step four: the wire feed speed is started after a fixed time until the arc and wire feed speed are in normal operation. .
Further, in step four, when the arc striking success is not detected for a long time, the operations of step one to step four are restarted.
Further, the wire feeding speed in the slow wire feeding state is lower than that in the normal working wire feeding state.
Further, the no-load voltage in the slow wire feeding state is larger than the arcing voltage in the normal working wire feeding state.
Further, in the process from the second step to the fourth step, the welding current is gradually increased to the arc striking current from the contact current, the arc striking current is kept until the arc striking is successful, then is gradually decreased, and is increased to the normal working current in a short time, wherein the contact current is smaller than the normal working current, and the normal working current is smaller than the arc striking current.
Further, in the process from the second step to the fourth step, the stay time of the wire feeding is a fixed value corrected according to the material of the welding wire, and the stay time is longer as the welding wire is thicker.
The invention has the following beneficial effects:
the dwell-state arc striking method for gas metal arc welding provided by the invention has the advantages that when arc striking current acts, the wire feeding is in a dwell state, no wire feeding is carried out, the continuously increased pre-pressure on a workpiece during slow wire feeding is reduced, favorable conditions are created for one-time ignition of pulse current, meanwhile, the wire feeding dwell control method is adopted, the difficulty of welding wire control is reduced, the consistency of a welding system is improved, the arc striking success rate can be effectively improved, and the cost is reduced.
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, and 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 these drawings without inventive exercise.
FIG. 1 is a schematic diagram of a stationary wire feed arc ignition process provided by an embodiment of the present invention;
fig. 2 is a schematic diagram of a time sequence of a stationary wire feeding arc striking process according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and 2, the present invention provides a dwell-state arc striking method for gas metal arc welding, comprising the steps of:
the method comprises the following steps: starting a power supply, starting a motor to work, starting wire feeding, keeping the wire feeding speed in a slow wire feeding state (the wire feeding speed is S1 at the moment), and waiting for a welding wire to contact a workpiece; the slow wire feeding state is a no-load voltage, which is represented by V1 in the figure. In fig. 1, a welding gun nozzle 1 is further included, a welding wire 2 is located in the welding gun nozzle 1, an arc 3 is established on a workpiece 100 by the front end of the welding wire 2, wherein the welding wire 2 side is connected with a positive electrode of a power supply, and the workpiece 100 side is connected with a negative electrode of the power supply, so that the welding gun can complete normal welding work.
Step two: when the contact of the workpiece is detected (at the moment t 0), the wire feeding is immediately stopped, and the wire feeding speed is zero (at the moment, the wire feeding speed is represented by S2 in the figure, the size is 0, and the wire feeding is in a standing state); at this time, the voltage is the short-circuit voltage V2, and the voltage value is 0. Because the welding wire is too thin, in the conventional MIG welding mode, after the electric arc is established, the motor cannot be started to feed the electric arc, and the electric arc is broken; therefore, an advance is needed, that is, the wire is not fed again until the arc is "existed", but the wire is fed when the arc is determined to exist in advance, and this time is defined as time t0 in this embodiment. The method provided by the invention has a little smaller contact pressure than the welding wire in the traditional mode without pause, so that the arc striking success rate is high.
Step three: the power supply starts to output arc striking current pulses and establishes an electric arc (at the moment of t1 and the moment of opening arc striking pulse current); the welding current at this time is the contact current I1.
Step four: when the voltage is output to the arcing voltage (namely, the voltage is increased from 0 to V3), when the arc striking is successful (at the moment of t2, the moment of successful arc guiding and the arc striking current at the moment are I2), the arc striking is matched with the wire feeding speed started at the moment of t3 (fixed time), until the wire feeding speed is in a normal working wire feeding state, the voltage value at the moment is the arcing voltage V3, the current is the normal working current I3, and the electric arc is normal.
In the case that a single arc striking failure still exists in the actual work, the invention adds a foolproof design, and in the fourth step, when the arc striking success is not detected for a long time (namely, the t2 signal cannot be detected for a long time), the operation from the first step to the fourth step is restarted, namely, the initial wire feeding speed is returned, and the arc striking program is restarted (the operation is started from the time t 0).
Specifically, the wire feeding speed S1 in the slow wire feeding state is lower than the wire feeding speed S3 in the normal working wire feeding state. The no-load voltage V1 in the slow wire feeding state is greater than the arcing voltage V3 in the normal working wire feeding state.
As shown in fig. 1 and fig. 2, further, in the process from step two to step four, the welding current is gradually increased from the contact current I1 to the arc striking current I2, the arc striking current I2 is maintained until the arc striking success time (t 2), then gradually decreased (the current minimum value decreased to be greater than the contact current I1 and less than the normal operating current I3), and increased to the normal operating current I3 again in a short time, wherein the contact current I1 is less than the normal operating current I3, and the normal operating current I3 is less than the arc striking current I2.
In the process from the second step to the fourth step, the time of the wire feeding stay (stay state) is a fixed value corrected according to the material of the welding wire, and the thicker the welding wire, the longer the stay time.
Compared with the prior art, the dwell-state arc striking method for gas metal arc welding provided by the invention has the advantages that when arc striking current acts, the wire feeding is in a dwell state, and the wire feeding speed is not high during arc striking, so that the continuously increased prepressing force of a welding wire and a workpiece is eliminated, and arc striking pulse is convenient for establishing electric arc. The motor is in a 'resident state' under the low-speed condition, the requirement on the inertia of the system is not high, and the response speed of the motor is higher than that of the back-drawing wire. The inertia requirement of the system is lower than that of a withdrawal filament arc ignition system. Compared with the traditional arc striking mode, when the arc striking pulse works, the contact between the welding wire and the workpiece is determined, so that the occurrence of secondary arc striking (the primary arc striking is unsuccessful and the secondary arc striking is carried out) is greatly reduced.
In conclusion, the stay-state arc striking method for gas metal arc welding provided by the invention has the advantages that when arc striking current acts, wire feeding is 'stay-state' without wire feeding, the continuously increased pre-pressure on a workpiece during slow wire feeding is reduced, favorable conditions are created for one-time ignition of pulse current, meanwhile, the difficulty of welding wire control is reduced by adopting a wire feeding stay control method, the consistency of a welding system is improved, the arc striking success rate can be effectively improved, and the cost is reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. A dwell-state arc striking method for gas metal arc welding is characterized by comprising the following steps:
the method comprises the following steps: starting a power supply and starting wire feeding, wherein the wire feeding speed is in a slow wire feeding state, and waiting for a welding wire to contact a workpiece;
step two: detecting the contact of the workpieces, and immediately stopping feeding the wires;
step three: after the system waits for the contact force to be stable, the power supply starts to output arc striking current pulses to establish electric arcs;
step four: starting the wire feeding speed after a fixed time until the electric arc and the wire feeding speed are in normal working state;
in the process from the second step to the fourth step, the welding current is gradually increased to the arc striking current from the contact current, an arc is established during the arc striking current, the arc voltage is increased, then the welding current is gradually reduced and is increased to the normal working current in a short time, wherein the contact current is smaller than the normal working current, and the normal working current is smaller than the arc striking current.
2. The dwell state arc initiation method of gas metal arc welding as claimed in claim 1, wherein: in step four, when the arc striking success is not detected for a long time, the operations of step one to step four are restarted.
3. The dwell state arc initiation method of gas metal arc welding as claimed in claim 1, wherein: the wire feeding speed in the slow wire feeding state is lower than that in the normal working wire feeding state.
4. The dwell state arc initiation method of gas metal arc welding as claimed in claim 1, wherein: the no-load voltage in the slow wire feeding state is larger than the arcing voltage in the normal working wire feeding state.
5. The dwell state arc initiation method of gas metal arc welding as claimed in claim 1, wherein: in the process from the second step to the fourth step, the stay time of the wire feeding is a fixed value corrected according to the material of the welding wire, and the stay time is longer as the welding wire is thicker.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110634256.8A CN113333913B (en) | 2021-06-07 | 2021-06-07 | Residence state arc striking method for gas metal arc welding |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110634256.8A CN113333913B (en) | 2021-06-07 | 2021-06-07 | Residence state arc striking method for gas metal arc welding |
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| CN113333913A CN113333913A (en) | 2021-09-03 |
| CN113333913B true CN113333913B (en) | 2023-03-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4312999B2 (en) * | 2002-06-27 | 2009-08-12 | 株式会社ダイヘン | Arc start control method. |
| CN1186161C (en) * | 2002-06-27 | 2005-01-26 | 上海交通大学 | Arc stricking method for metal gas arc welding |
| CN106695071B (en) * | 2016-12-30 | 2018-09-04 | 唐山松下产业机器有限公司 | Arc start control method and device |
| CN109047990B (en) * | 2018-10-22 | 2020-11-10 | 唐山松下产业机器有限公司 | Control method for contact arc striking of gas metal arc welding |
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