CN111633303B - Aluminum alloy variable polarity plasma arc piercing welding arc starting and stopping quality control method and system - Google Patents

Aluminum alloy variable polarity plasma arc piercing welding arc starting and stopping quality control method and system Download PDF

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CN111633303B
CN111633303B CN202010367422.8A CN202010367422A CN111633303B CN 111633303 B CN111633303 B CN 111633303B CN 202010367422 A CN202010367422 A CN 202010367422A CN 111633303 B CN111633303 B CN 111633303B
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welding
arc
stage
current
welding gun
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CN111633303A (en
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黄宁
韩建超
张铁民
张亚霄
姜坤
陈树君
高立征
张又升
李博毅
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Beijing Satellite Manufacturing Factory Co Ltd
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Beijing Satellite Manufacturing Factory Co Ltd
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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
    • B23K9/16—Arc welding or cutting making use of shielding gas
    • 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
    • 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
    • B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
    • B23K9/1006—Power supply
    • B23K9/1012—Power supply characterised by parts of the process
    • 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
    • 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
    • B23K9/124—Circuits or methods for feeding welding wire
    • 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
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/08—Non-ferrous metals or alloys
    • B23K2103/10—Aluminium or alloys thereof

Abstract

The invention relates to a method and a system for controlling starting and stopping arc quality of aluminum alloy variable polarity plasma arc perforation welding, which comprises the following steps of (1) establishing a pilot arc between a tungsten electrode of a welding gun and a nozzle, adjusting the distance between the nozzle of the welding gun and a workpiece to 3-5mm after the arc is stabilized, and then establishing a main arc between the welding gun and the sheet workpiece; (2) a first section, main arc establishment; (3) in the second stage, the welding current is gradually increased to 50% -80% of the current of the normal working stage, and the walking speed of the welding gun is gradually increased; (4) and in the third stage, when the welding gun travels to 30-50mm, the front melting width of the welding pool gradually grows to 6-12mm when the melting width is perforated, and the ion gas flow is increased from the initial value of 1-2L/min to 3-5L/min. According to the invention, by matching the current waveform rising curve, the welding gun walking speed and the wire feeding parameters, the welding process is gradually preheated to form a perforation molten pool, the first-time qualification rate of the arc starting and closing of the welding seam is effectively improved, and the operation difficulty is reduced.

Description

Aluminum alloy variable polarity plasma arc piercing welding arc starting and stopping quality control method and system
Technical Field
The invention belongs to the technical field of mechanical engineering, and relates to an aluminum alloy variable polarity plasma arc piercing welding starting and stopping quality control method and system.
Background
The Variable Polarity Plasma Arc (VPPA) welding method has the characteristics of energy concentration, high arc stiffness, small deformation after welding and the like. The VPPA welding usually adopts a perforation vertical welding process, and is more favorable for eliminating welding defects such as air holes, and the like, so the VPPA welding method is widely applied to the welding of aluminum alloy of a manned spacecraft sealing shell structure.
The polarity-variable plasma arc perforation welding is one of the mainstream welding processes of a spacecraft sealed cabin structure, but due to the vertical operation mode and numerous welding process parameters, the quality control difficulty is high, particularly the reliable establishment of a perforation molten pool in the arcing stage is the key for the smooth proceeding of the aluminum alloy polarity-variable plasma arc perforation welding, and once the welding seam is cut, the whole welding seam fails. In the traditional arc starting and arc stopping control, fixed-point arc starting is adopted, namely, the arc starting is waited for 5-7s, a welding gun is moved to walk after the arc is perforated, and welding beading and other defects are easily formed on the front side or the back side of a welding line and possibly cause welding piece scrapping depending on the empirical judgment of a welder on the state of a molten pool.
Disclosure of Invention
The technical problem solved by the invention is as follows: the method and the system overcome the defects of the prior art and provide the arc starting and closing quality control method and the system for the variable-polarity plasma arc perforation welding of the aluminum alloy.A welding gun immediately walks after an electric arc is established between the welding gun and a sheet workpiece, and the welding process is gradually preheated to form a perforation molten pool by matching a current waveform climbing curve, the welding gun walking speed and the parameters of wire feeding; meanwhile, during arc-closing, the small hole is gradually closed by the welding wire to gradually fill the molten pool by matching the current attenuation curve, the welding gun walking speed and the wire feeding parameters, so that the primary qualification rate of the welding seam for arc-closing is effectively improved, the difficulty of operators is reduced, and the quality of automatic welding is effectively improved.
The technical scheme of the invention is as follows:
a variable polarity plasma arc perforation welding starting and stopping arc quality control method for aluminum alloy comprises the following steps:
(1) establishing a pilot arc between a tungsten electrode of a welding gun and a nozzle, adjusting the distance between the nozzle of the welding gun and a workpiece to 3-5mm after the electric arc is stabilized, and then establishing a main arc between the welding gun and the sheet workpiece;
(2) in the first stage, a main arc is established, the welding current is 10% -30% of the current of the normal working stage, the welding current stays for 2-3s in situ, a welding gun starts to walk, and running arcing is started;
(3) in the second stage, the welding current is gradually increased to 50% -80% of the current of the normal working stage, and the walking speed of the welding gun is gradually increased;
(4) in the third stage, when the welding gun travels to 30-50mm, the front melting width of the welding pool gradually grows to 6-12mm when the melting width is perforated, the ion gas flow is increased from 1-2L/min to 3-5L/min, the wire feeding is started, and meanwhile, the welding current and the welding speed are still gradually increased;
(5) in the fourth stage, the plasma arc penetrates through the welded plate to form a perforation molten pool, the normal wire feeding speed is adjusted to 0.8-1.2m/min at the moment of perforation, and normal welding is started;
(6) a fifth section, a normal welding section, wherein the wire feeding position and the welding gun position are finely adjusted according to the stability condition of a molten pool, electric arcs are stabilized, when the front side and the back side of a welding seam monitor the position of an arcing welding seam, the distance between the welding gun and a workpiece is increased to 4-5mm, and when the welding gun walks to exceed the point of a perforation of arcing to be more than 10mm, a running arc-retracting action is started;
(7) a sixth section, starting the running arc-retracting action, gradually reducing the welding current and the ionic gas flow, attenuating to 60-80% of the parameters of the normal working section, simultaneously increasing the welding speed to 0.15-0.20m/min instantly, and increasing the wire feeding speed to 1.5-2.0m/min instantly;
(8) in the seventh stage, after the welding gun walks in place, the welding current and the ion gas flow are rapidly reduced to 40-60% of the parameters of the normal working stage;
(9) the eighth stage, the welding gun stops walking, the welding speed is zero, the welding current is continuously reduced and is attenuated to 20% -40% of the parameters of the normal working stage, the wire feeding speed is adjusted to 0.6-1.0m/min, and the filling of small holes is completed;
(10) in the ninth stage, the welding current is continuously reduced to be attenuated to 20-30% of the parameters of the normal working stage, and the wire feeding speed is continuously reduced to 0.3-0.6 m/min;
(11) and in the tenth stage, maintaining the welding arc for 3-5 seconds, then stopping the welding current and the ion gas, and turning off the power supply.
Preferably, in step (2), the perforation time is delayed with the increase of the duration of the ascending phase, and the optimum perforation time is the middle and later stages of the ascending phase.
Preferably, in the step (5), the welding speed is 0.12-0.18 m/min.
Preferably, in step (7), the welding gun travels a distance equal to half the diameter of the molten pool to be perforated during the process.
Preferably, in step (8), the arc energy is momentarily reduced and the keyhole of the molten pool is closed.
Preferably, in the step (10), the wire feeding is stopped after the full weld reinforcement is formed, that is, the welding wire speed is zero.
An arc starting and closing quality control system for aluminum alloy variable polarity plasma arc perforation welding comprises a welding power supply, a wire feeder, a welding gun walking mechanism, a welding seam front visual sensor, a welding seam back visual sensor, an ionic gas flow sensor, a welding current sensor, a workpiece to be welded and a controller,
the welding current generated by the welding power supply provides a welding pilot arc and a main arc;
the wire feeder feeds the welding wire into the molten pool, and the wire feeding amount is adjusted by adjusting the rotating speed of the motor;
the welding gun walking mechanism clamps the welding gun and adjusts the welding speed by adjusting the rotating speed of the motor;
monitoring the perforation and closing state of a welding pool by visual sensors on the front side and the back side of the welding line;
monitoring the real-time flow of the ion gas through an ion gas flow sensor, and introducing argon gas through a welding gun to serve as protective gas in the welding process;
a welding current sensor monitors the real-time current value of the welding process;
the controller executes the control and communication functions of all parts of the whole welding process, and performs segmented program control on four main parameters of welding current, ionic gas flow, welding gun walking speed and wire feeding speed.
Compared with the prior art, the invention has the beneficial effects that:
(1) the traditional starting and stopping control adopts fixed-point arc starting, namely, the arc starting is waited for 5-7s, the welding gun is moved to walk after the arc is perforated, and the defects of welding beading and the like are easily formed on the front side or the back side of a welding seam and the like depending on the empirical judgment of a welder on the state of a molten pool;
(2) the invention provides a program curve of welding current, ion gas flow, welding gun walking and wire feeding speed, when the energy of a molten pool is accumulated to a certain degree, the acting force (i.e. the ion gas flow) on the molten pool is increased to quickly form a perforation, and the perforation is stabilized at the stage of increasing the welding current and the ion gas; the punching time is delayed along with the extension of the duration time of the rising stage, the optimal punching time is the middle and later stages of the rising stage, and the first-time yield of arc striking can be obviously improved.
Drawings
FIG. 1 is a logic diagram of the time sequence of welding parameters during run start and arc strike in accordance with the present invention.
Detailed Description
The invention will be further illustrated with reference to examples in which a 3mm 5xxx aluminium alloy is selected as the welding workpiece.
(1) Establishing pilot arc between the tungsten electrode and the nozzle of the welding gun, adjusting the distance between the nozzle of the welding gun and the workpiece to be 4mm after the electric arc is stabilized, and t in figure 10At any moment, then establishing a main arc between a welding gun and a thin plate workpiece;
(2) first stage, i.e. t in FIG. 10-t1At the moment, a main arc is established, the welding current is 30% of the current of a normal working section, the main arc stays for 2-3s in the original position, a welding gun starts to walk, and running arcing is started;
(3) second segment, t in FIG. 11-t2At that moment, the welding current is gradually increased to 60% of the normal operating range current, andthe walking speed of the welding gun is gradually increased;
(4) third, t in FIG. 12-t3At the moment, when the welding gun travels to 35mm and the melting width of the front surface of the welding molten pool gradually grows to 8mm when the melting width is perforated, the ion gas flow is increased from an initial value of 1L/min to 3L/min, the wire feeding is started, and meanwhile, the welding current and the welding speed are still gradually increased. With the extension of the duration of the rising stage, the perforation time is delayed, and the optimal perforation time is the middle and later stages of the rising stage;
(5) fourth, i.e. t in FIG. 13-t4At the moment, a plasma arc penetrates through a welded plate to form a perforation molten pool, the normal wire feeding speed is adjusted to 1.2m/min at the moment of perforation, a stable perforation molten pool is formed by matching multiple parameters such as welding current, ionic gas flow, welding speed, wire feeding speed and the like, normal welding is started, and the welding speed is 0.16 m/min;
(6) fifth section, t in FIG. 14-t5At any moment, in a normal welding section, the wire feeding position and the welding gun position can be finely adjusted according to the stability condition of a molten pool, electric arcs are stabilized, when the front side and the back side of a welding seam monitor the position of an arcing welding seam, the distance between the welding gun and a workpiece is increased by 4.5mm, and when the welding gun walks beyond the point of perforation of arcing to be more than 10mm, a running arc-retracting action is started;
(7) sixth segment, t in FIG. 15-t6Starting a running arc-withdrawing action at the moment, gradually reducing the welding current and the ionic gas flow (attenuating to 70 percent of the parameters of a normal working section), simultaneously and instantly increasing the welding speed to be 0.20m/min and the wire feeding speed to be 1.8m/min, wherein the welding gun walking distance is half of the diameter of a perforation molten pool in the process of the section;
(8) seventh stage, i.e. t in FIG. 16-t7At any moment, after the welding gun walks in place, the welding current and the ionic gas flow are rapidly reduced (the flow is attenuated to 50 percent of the parameters of a normal working section), namely the electric arc energy is instantly reduced, and a small hole of a perforation molten pool is closed;
(9) eighth paragraph, t in FIG. 17-t8At that time, the welding torch stops moving, the welding speed is zero, and the welding current continues to decrease (decaying to the normal operating range parameters)30 percent), adjusting the wire feeding speed to 0.8m/min to complete the filling of the small holes;
(10) ninth paragraph, t in FIG. 18-t9At the moment, the welding current is continuously reduced (attenuated to 25% of the parameters of the normal working section), the wire feeding speed is continuously reduced to 0.6m/min, the wire feeding is stopped after full weld reinforcement is formed, namely the welding wire speed is zero;
(11) the tenth paragraph, t in FIG. 19-t10At the moment, the welding arc is maintained for 3-5 seconds, then the welding current and the ion gas are stopped, and the power supply is turned off.
An arc starting and closing quality control system for aluminum alloy variable polarity plasma arc perforation welding comprises a welding power supply, a wire feeder, a welding gun walking mechanism, a welding seam front visual sensor, a welding seam back visual sensor, an ionic gas flow sensor, a welding current sensor, a workpiece to be welded and a controller,
the welding current generated by the welding power supply provides a welding pilot arc and a main arc;
the wire feeder feeds the welding wire into the molten pool, and the wire feeding amount is adjusted by adjusting the rotating speed of the motor;
the welding gun walking mechanism clamps the welding gun and adjusts the welding speed by adjusting the rotating speed of the motor;
monitoring the perforation and closing state of a welding pool by visual sensors on the front side and the back side of the welding line;
monitoring the real-time flow of the ion gas through an ion gas flow sensor, and introducing argon gas through a welding gun to serve as protective gas in the welding process;
a welding current sensor monitors the real-time current value of the welding process;
the controller executes the control and communication functions of all parts in the whole welding process, and performs subsection program control on four main parameters of welding current, ionic gas flow, welding gun walking speed and wire feeding speed, wherein the specific control process is the subsection control process.
The invention provides a program curve of welding current, ion gas flow, welding gun walking and wire feeding speed, when the energy of a molten pool is accumulated to a certain degree, the acting force (i.e. the ion gas flow) on the molten pool is increased to quickly form a perforation, and the perforation is stabilized at the stage of increasing the welding current and the ion gas; the punching time is delayed along with the extension of the duration time of the rising stage, the optimal punching time is the middle and later stages of the rising stage, and the first-time yield of arc striking can be obviously improved.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.

Claims (9)

1. The variable polarity plasma arc piercing welding starting and stopping quality control method for the aluminum alloy is characterized by comprising the following steps of:
(1) establishing a pilot arc between a tungsten electrode of a welding gun and a nozzle, adjusting the distance between the nozzle of the welding gun and a workpiece to 3-5mm after the electric arc is stabilized, and then establishing a main arc between the welding gun and the sheet workpiece;
(2) in the first stage, a main arc is established, the welding current is 10% -30% of the current of the normal working stage, the welding current stays for 2-3s in situ, a welding gun starts to walk, and running arcing is started;
(3) in the second stage, the welding current is gradually increased to 50% -80% of the current of the normal working stage, and the walking speed of the welding gun is gradually increased;
(4) in the third stage, when the welding gun travels to 30-50mm, the front melting width of the welding pool gradually grows to 6-12mm when the melting width is perforated, the ion gas flow is increased from 1-2L/min to 3-5L/min, the wire feeding is started, and meanwhile, the welding current and the welding speed are still gradually increased;
(5) in the fourth stage, the plasma arc penetrates through the welded plate to form a perforation molten pool, the normal wire feeding speed is adjusted to 0.8-1.2m/min at the moment of perforation, and normal welding is started;
(6) a fifth section, a normal welding section, wherein the wire feeding position and the welding gun position are finely adjusted according to the stability condition of a molten pool, electric arcs are stabilized, when the front side and the back side of a welding seam monitor the position of an arcing welding seam, the distance between the welding gun and a workpiece is increased to 4-5mm, and when the welding gun walks to exceed the point of a perforation of arcing to be more than 10mm, a running arc-retracting action is started;
(7) a sixth section, starting the running arc-retracting action, gradually reducing the welding current and the ionic gas flow, attenuating to 60-80% of the parameters of the normal working section, simultaneously increasing the welding speed to 0.15-0.20m/min instantly, and increasing the wire feeding speed to 1.5-2.0m/min instantly;
(8) in the seventh stage, after the welding gun walks in place, the welding current and the ion gas flow are rapidly reduced to 40-60% of the parameters of the normal working stage;
(9) the eighth stage, the welding gun stops walking, the welding speed is zero, the welding current is continuously reduced and is attenuated to 20% -40% of the parameters of the normal working stage, the wire feeding speed is adjusted to 0.6-1.0m/min, and the filling of small holes is completed;
(10) in the ninth stage, the welding current is continuously reduced to be attenuated to 20-30% of the parameters of the normal working stage, and the wire feeding speed is continuously reduced to 0.3-0.6 m/min;
(11) and in the tenth stage, maintaining the welding arc for 3-5 seconds, then stopping the welding current and the ion gas, and turning off the power supply.
2. The method of claim 1, wherein in step (2), the piercing time is delayed with the duration of the ascending phase, and the optimal piercing time is the middle and later stages of the ascending phase.
3. The method of claim 1, wherein in step (5), the welding speed is 0.12-0.18 m/min.
4. The method of claim 1, wherein in step (7), the distance traveled by the welding torch during the welding process is half the diameter of the molten pool of the piercing hole.
5. The method of claim 1, wherein in step (8), the arc energy is momentarily reduced and the keyhole of the keyhole molten pool is closed.
6. The method for controlling the arc starting and stopping quality of the aluminum alloy through the plasma arc perforation welding in the variable polarity manner according to claim 1, wherein in the step (10), the wire feeding is stopped after the full weld bead is formed, namely the welding wire speed is zero.
7. An arc starting and stopping quality control system for aluminum alloy variable polarity plasma arc perforation welding is characterized by comprising a welding power supply, a wire feeder, a welding gun walking mechanism, a welding seam front visual sensor, a welding seam back visual sensor, an ionic gas flow sensor, a welding current sensor, a workpiece to be welded and a controller,
the welding current generated by the welding power supply provides a welding pilot arc and a main arc;
the wire feeder feeds the welding wire into the molten pool, and the wire feeding amount is adjusted by adjusting the rotating speed of the motor;
the welding gun walking mechanism clamps the welding gun and adjusts the welding speed by adjusting the rotating speed of the motor;
monitoring the perforation and closing state of a welding pool by visual sensors on the front side and the back side of the welding line;
monitoring the real-time flow of the ion gas through an ion gas flow sensor, and introducing argon gas through a welding gun to serve as protective gas in the welding process;
a welding current sensor monitors the real-time current value of the welding process;
the controller executes the control and communication functions of each part of the whole welding process, and performs segmented program control on four main parameters of welding current, ionic gas flow, welding gun walking speed and wire feeding speed;
the control process of the segmentation program comprises the following steps:
(1) in the first stage, a main arc is established, the welding current is 10% -30% of the current of the normal working stage, the welding current stays for 2-3s in situ, a welding gun starts to walk, and running arcing is started;
(2) in the second stage, the welding current is gradually increased to 50% -80% of the current of the normal working stage, and the walking speed of the welding gun is gradually increased;
(3) in the third stage, when the welding gun travels to 30-50mm, the front melting width of the welding pool gradually grows to 6-12mm when the melting width is perforated, the ion gas flow is increased from 1-2L/min to 3-5L/min, the wire feeding is started, and meanwhile, the welding current and the welding speed are still gradually increased;
(4) in the fourth stage, the plasma arc penetrates through the welded plate to form a perforation molten pool, the normal wire feeding speed is adjusted to 0.8-1.2m/min at the moment of perforation, and normal welding is started;
(5) a fifth section, a normal welding section, wherein the wire feeding position and the welding gun position are finely adjusted according to the stability condition of a molten pool, electric arcs are stabilized, when the front side and the back side of a welding seam monitor the position of an arcing welding seam, the distance between the welding gun and a workpiece is increased to 4-5mm, and when the welding gun walks to exceed the point of a perforation of arcing to be more than 10mm, a running arc-retracting action is started;
(6) a sixth section, starting the running arc-retracting action, gradually reducing the welding current and the ionic gas flow, attenuating to 60-80% of the parameters of the normal working section, simultaneously increasing the welding speed to 0.15-0.20m/min instantly, and increasing the wire feeding speed to 1.5-2.0m/min instantly;
(7) in the seventh stage, after the welding gun walks in place, the welding current and the ion gas flow are rapidly reduced to 40-60% of the parameters of the normal working stage;
(8) the eighth stage, the welding gun stops walking, the welding speed is zero, the welding current is continuously reduced and is attenuated to 20% -40% of the parameters of the normal working stage, the wire feeding speed is adjusted to 0.6-1.0m/min, and the filling of small holes is completed;
(9) in the ninth stage, the welding current is continuously reduced to be attenuated to 20-30% of the parameters of the normal working stage, and the wire feeding speed is continuously reduced to 0.3-0.6 m/min;
(10) and in the tenth stage, maintaining the welding arc for 3-5 seconds, then stopping the welding current and the ion gas, and turning off the power supply.
8. The plasma arc piercing welding starting and stopping quality control system of aluminum alloy according to claim 7, wherein in the step (4), the welding speed is 0.12-0.18 m/min.
9. The plasma arc piercing welding arc starting and stopping quality control system of aluminum alloy according to claim 7, wherein in step (6), the welding gun travels a distance of half the diameter of the piercing molten pool during the period.
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