CN109202217B - Gas shielded welding machine convenient to strike arc - Google Patents
Gas shielded welding machine convenient to strike arc Download PDFInfo
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- CN109202217B CN109202217B CN201811135190.2A CN201811135190A CN109202217B CN 109202217 B CN109202217 B CN 109202217B CN 201811135190 A CN201811135190 A CN 201811135190A CN 109202217 B CN109202217 B CN 109202217B
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- 238000003466 welding Methods 0.000 title claims abstract description 149
- 230000002596 correlated effect Effects 0.000 claims abstract description 15
- 238000002844 melting Methods 0.000 claims abstract description 9
- 230000008018 melting Effects 0.000 claims abstract description 9
- 230000001960 triggered effect Effects 0.000 claims abstract description 6
- 230000001276 controlling effect Effects 0.000 claims abstract description 4
- 230000007547 defect Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 32
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Classifications
-
- 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
- B23K9/09—Arrangements or circuits for arc welding with pulsed current or voltage
- B23K9/091—Arrangements or circuits for arc welding with pulsed current or voltage characterised by the circuits
- B23K9/092—Arrangements or circuits for arc welding with pulsed current or voltage characterised by the circuits characterised by the shape of the pulses produced
-
- 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
- B23K9/32—Accessories
Abstract
The invention discloses a gas shielded welding machine convenient for arc striking, which comprises an inverter rectification circuit, a current feedback circuit, a welding machine arc striking switch and a controller, wherein the inverter rectification circuit is connected with the controller; the output of the inverter rectifying circuit is connected with an arc electrode of the welding machine; the current feedback circuit is used for collecting the current of the arc electrode of the welding machine; the controller is used for controlling the inverter rectifying circuit to supply power to the arc electrode of the welding machine; when the arc starting switch of the welding machine is triggered, the controller controls the inverter rectifying circuit to output arc starting pulses to the arc electrode, and the pulse current and/or the pulse width of the arc starting pulses are positively correlated with the welding stopping interval t. The gas shielded welding machine convenient for arc striking can lead the melting amount of the cold-state welding wire and the melting amount of the hot-state welding wire to be the same, and avoid the arc length inconsistency at the moment of arc striking to cause the arc striking welding defect of a welding seam.
Description
Technical Field
The invention relates to a welding technology, in particular to a gas shielded welding machine convenient for arc striking.
Background
The gas shielded welding machine (cogas protective welding wire) does not use welding wire for welding rod, uses mixed gas of CO2, CO2 and argon, mixed gas of CO2 and helium as protective gas, and includes power supply, wire-feeding motor and other parts, and the welding current of gas shielded welding can be output into rectangular pulse waveform to achieve jet transition, so that it is easy to weld at all positions.
The arc striking mode of the consumable electrode pulse current gas shielded welding generally has three types: breaking the arc (the welding wire contacts the workpiece, electrifying to melt the contact part of the welding wire and the workpiece, and igniting the arc after the welding wire is broken); slow wire feed arc initiation (the wire is fed slowly toward the workpiece until the arc ignites, then the wire feed speed is increased) and draw-back arc initiation (the wire contacts the workpiece, and the wire is drawn back after power is applied to ignite the arc).
In the existing arc starting method of gas shielded welding, a fixed pulse (the size and the width of the peak current of the pulse are related to the material and the diameter of a welding wire) is output by a gas shielded welding machine at the moment when the welding wire contacts a workpiece, the welding wire is instantly melted off, and then the welding state is entered. When the arc is started in the welding, if a long time is separated from the last welding, the welding wire is in a cold state; if the interval is short from the last weld, the wire is hot. When the welding wire is in a cold state and a hot state, the same fixed pulse is used, the melting amount of the welding wire is different, if the pulse is proper in melting amount when in the cold state, the welding wire is slightly melted when in the hot state, and conversely, the pulse is proper in melting when in the hot state and is not enough when in the cold state, so that the arc length at the arc striking moment is inconsistent, and the arc striking welding defect of the welding wire is caused.
Disclosure of Invention
The invention aims to solve the technical problem of providing a gas shielded welding machine convenient for arc striking, which can ensure that the melting quantities of a cold-state welding wire and a hot-state welding wire are the same, and avoid the arc striking welding defects of welding seams caused by inconsistent arc lengths at the moment of arc striking.
In order to solve the technical problem, the invention provides a gas shielded welding machine convenient for arc striking, which comprises an inverter rectification circuit, a current feedback circuit, a welding machine arc striking switch and a controller, wherein the inverter rectification circuit is connected with the controller;
the output of the inverter rectifying circuit is connected with an arc electrode of the welding machine;
the current feedback circuit is used for collecting the current of the arc electrode of the welding machine;
the controller is used for controlling the inverter rectifying circuit to supply power to the arc electrode of the welding machine;
when the welder arc starting switch is triggered, the controller controls the inverter rectifying circuit to output arc starting pulses to the arc electrode, the pulse current and/or the pulse width of the arc starting pulses are positively correlated with a welding stopping interval t, and the welding stopping interval t is a time period from the beginning of 0 current of the welder arc electrode to the time period when the welder arc starting switch is triggered.
Preferably, the pulse current of the arc starting pulse is positively correlated with the welding stopping interval t, and the pulse width is not changed.
Preferably, the pulse width of the arc starting pulse is positively correlated with the welding stop interval t, and the pulse current is not changed.
Preferably, the pulse current and the pulse width of the arc starting pulse are positively correlated with the welding stop interval t.
Preferably, M = t0*i0 ；
When t isR≤t，M=MR ；
When t < tR，M=MS；
MS＜MR ；
i0Is a pulse current, t0Is the pulse width, tRThe initial cold welding threshold duration, M is the pulse area, MSIs a standard pulse area, MRThe pulse area is set for the initial cold welding.
Preferably, M = t0*i0 ；
When t isn≤t＜tn+1 ，M=Mn ；
When t isK+1≤t，M=MK+1 ；
When t < tR，M=MS；
tR＜tn＜tn+1，MS＜Mn＜Mn+1 ；
K is a positive integer, n is a positive integer less than or equal to K, i0Is a pulse current, t0Is the pulse width, tRTo initiate a cold welding threshold duration, tnSetting the duration for the nth, M is the pulse area, MSIs a standard pulse area, MnSetting the pulse area for the nth, Mn+1The pulse area is set for the n +1 th.
Preferably, K is 1 or 2.
Preferably, M = t0*i0 ；
When t < tR，M=MS ；
When t isR≤t＜tL ，M=ML；
When t isH≤t，M=MH；
When t isL≤t＜tH，M= MH–(d*（MH-ML）/（tH-tL）)；
tR＜tL＜tH ，MS＜ML＜MH ；
i0Is a pulse current, t0Is the pulse width, tRTo initiate a cold welding threshold duration, tLFor cold welding a low threshold duration, tHFor cold welding, the threshold length is high, M is the pulse area, MSIs a standard pulse area, MLSetting pulse area, M, for low cold weldingHThe pulse area is set for high cold welding and d is the coefficient.
Preferably, the pulse current and/or pulse width of the arc starting pulse is in positive exponential correlation with the welding stopping interval t.
Preferably, the pulse current i of the arcing pulse0Greater than 180A and less than 300A, pulse width t0Greater than 400us and less than 600 us.
The invention relates to a gas shielded welding machine convenient for arc striking, wherein the arc striking is carried out by adjusting the pulse current and/or the pulse width of the arc striking pulse of the gas shielded welding machine at the current time according to the welding stopping interval t between the arc striking start of the gas shielded welding machine at the current time and the welding stopping interval t of the gas shielded welding machine at the last welding end of the gas shielded welding machine, so that the pulse current and/or the pulse width of the arc striking pulse of the gas shielded welding machine at the current time are positively correlated with the welding stopping interval t, the pulse during the arc striking is automatically adjusted according to the length of the welding stopping interval t, the melting quantities of cold-state welding wires and hot-state welding wires are the same, and the arc striking defect caused by the inconsistent arc.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the present invention are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of a gas shielded welding machine for facilitating arc starting according to the present application.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
Example one
As shown in fig. 1, the gas shielded welding machine convenient for arc striking comprises an inverter rectification circuit, a current feedback circuit, a welding machine arc striking switch and a controller;
the output of the inverter rectifying circuit is connected with an arc electrode of the welding machine;
the current feedback circuit is used for collecting the current of the arc electrode of the welding machine;
the controller is used for controlling the inverter rectifying circuit to supply power to the arc electrode of the welding machine;
when the welder arc starting switch is triggered, the controller controls the inverter rectifying circuit to output arc starting pulses to the arc electrode, the pulse current and/or the pulse width of the arc starting pulses are positively correlated with a welding stopping interval t, and the welding stopping interval t is a time period from the beginning of 0 current of the welder arc electrode to the time period when the welder arc starting switch is triggered.
Preferably, the pulse current of the arc starting pulse is positively correlated with the welding stopping interval t, and the pulse width is not changed.
Preferably, the pulse width of the arc starting pulse is positively correlated with the welding stop interval t, and the pulse current is not changed.
Preferably, the pulse current and the pulse width of the arc starting pulse are positively correlated with the welding stop interval t.
The gas shielded welding machine convenient for arc striking of the embodiment I is characterized in that the arc striking is carried out according to the welding stopping interval t between the beginning of arc striking of the current welding of the gas shielded welding machine and the last welding end of the gas shielded welding machine, the pulse current and/or the pulse width of the arc striking pulse of the current welding of the gas shielded welding machine are/is adjusted, the pulse current and/or the pulse width of the arc striking pulse of the current welding of the gas shielded welding machine are/is positively correlated with the welding stopping interval t, the pulse during arc striking is automatically adjusted according to the length of the welding stopping interval t, the melting quantities of cold-state welding wires and hot-state welding wires are the same, and the arc length at the moment of arc striking is prevented from being inconsistent, so that.
Example two
Gas shielded welding machine convenient for arc striking based on embodiment one, M = t0*i0 ；
When t isR≤t，M=MR ；
When t < tR，M=MS；
MS＜MR ；
i0Is a pulse current, t0Is the pulse width, tRThe initial cold welding threshold duration, M is the pulse area, MSIs a standard pulse area, MRThe pulse area is set for the initial cold welding.
The gas shielded welding machine convenient for arc striking of the second embodiment adopts a single-step type to adjust the arc striking pulse, and the time length t is the cold welding threshold when the welding stopping interval t reachesRIncreasing the pulse area of the arcing pulse to the set pulse area M for cold welding by increasing the pulse current and/or pulse width of the arcing pulseR。
EXAMPLE III
Gas shielded welding machine based on embodiment one, M = t0*i0 ；
When t isn≤t＜tn+1 ，M=Mn ；
When t isK+1≤t，M=MK+1 ；
When t < tR，M=MS；
tR＜tn＜tn+1，MS＜Mn＜Mn+1 ；
K is a positive integer, n is a positive integer less than or equal to K, i0Is a pulse current, t0Is the pulse width, tRTo initiate a cold welding threshold duration, tnFor the nth setting of duration, M is pulseArea of impact, MSIs a standard pulse area, MnSetting the pulse area for the nth, Mn+1The pulse area is set for the n +1 th.
Preferably, K is 1 or 2.
In the gas shielded welding machine convenient for arc striking in the third embodiment, the arc striking pulse is adjusted in a multi-step manner, and the welding stopping interval t reaches different set time lengths tnThe pulse area of the arcing pulse is increased to the corresponding set pulse area M by adjusting the pulse current and/or the pulse width of the arcing pulsen。
Example four
Gas shielded welding machine based on embodiment one, M = t0*i0 ；
When t < tR，M=MS ；
When t isR≤t＜tL ，M=ML；
When t isH≤t，M=MH；
When t isL≤t＜tH，M= MH–(d*（MH-ML）/（tH-tL）)；
tR＜tL＜tH ，MS＜ML＜MH ；
i0Is a pulse current, t0Is the pulse width, tRTo initiate a cold welding threshold duration, tLFor cold welding a low threshold duration, tHFor cold welding, the threshold length is high, M is the pulse area, MSIs a standard pulse area, MLSetting pulse area, M, for low cold weldingHThe pulse area is set for high cold welding, and d is a coefficient (which can be set according to different welding wire materials and welding wire diameters).
The gas shielded welding machine convenient for arc striking of the fourth embodiment adopts a step linear type to adjust the arc striking pulse.
EXAMPLE five
The gas shielded welding machine convenient for arc striking is based on the first embodiment, the pulse current and/or the pulse width of the arc striking pulse is in positive exponential correlation with the welding stopping interval t;
it is preferable thatPulse current i of the arcing pulse0Greater than 180A and less than 800A, pulse width t0Greater than 0.4ms and less than 100 ms.
The above are merely preferred embodiments of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (7)
1. A gas shielded welding machine convenient for arc striking is characterized by comprising an inverter rectification circuit, a current feedback circuit, a welding machine arc striking switch and a controller;
the output of the inverter rectifying circuit is connected with an arc electrode of the welding machine;
the current feedback circuit is used for collecting the current of the arc electrode of the welding machine;
the controller is used for controlling the inverter rectifying circuit to supply power to the arc electrode of the welding machine;
when the welder arc starting switch is triggered, the controller controls the inverter rectifying circuit to output arc starting pulses to the arc electrode, the pulse current and/or the pulse width of the arc starting pulses are positively correlated with a welding stopping interval t, so that the melting quantities of cold-state welding wires and hot-state welding wires are the same, and the welding stopping interval t is a period from the beginning of 0 current of the welder arc electrode to the triggering of the welder arc starting switch;
the pulse area M is:
M=t0*i0(ii) a When t isR≤t，M=MR(ii) a When t < tR，M=MS；MS＜MR ；
Alternatively, the first and second electrodes may be,
M=t0*i0(ii) a When t isn≤t＜tn+1 ，M=Mn(ii) a When t isK+1≤t，M=MK+1(ii) a When t < tR，M=MS；
tR＜tn＜tn+1，MS＜Mn＜Mn+1 ；
Alternatively, the first and second electrodes may be,
M=t0*i0 (ii) a When t < tR，M=MS(ii) a When t isR≤t＜tL ，M=ML(ii) a When t isH≤t，M=MH；
When t isL≤t＜tH，M= MH–(d*（MH-ML）/（tH-tL）)；tR＜tL＜tH ，MS＜ML＜MH ；
i0Is a pulse current, t0Is the pulse width, tRTo initiate the cold welding threshold duration, MSIs a standard pulse area, MRSetting a pulse area for initial cold welding; k is a positive integer, n is a positive integer less than or equal to K, tnFor the nth setting of the duration, MnSetting the pulse area for the nth, Mn+1Setting the pulse area, t, for the n +1 th pulseLFor cold welding a low threshold duration, tHFor cold welding a high threshold length of time, MLSetting pulse area, M, for low cold weldingHThe pulse area is set for high cold welding and d is the coefficient.
2. The gas shielded welding machine facilitating arc starting as set forth in claim 1,
the pulse current of the arc starting pulse is positively correlated with the welding stopping interval t, and the pulse width is unchanged.
3. The gas shielded welding machine facilitating arc starting as set forth in claim 1,
the pulse width of the arc starting pulse is positively correlated with the welding stopping interval t, and the pulse current is unchanged.
4. The gas shielded welding machine facilitating arc starting as set forth in claim 1,
the pulse current and the pulse width of the arc starting pulse are positively correlated with the welding stopping interval t.
5. The gas shielded welding machine facilitating arc starting as set forth in claim 1,
k is 1 or 2.
6. The gas shielded welding machine facilitating arc starting as set forth in claim 1,
the pulse current and/or pulse width of the arc starting pulse is in positive exponential correlation with the welding stopping interval t.
7. The gas shielded welding machine facilitating arc starting as set forth in claim 1,
pulse current i of arcing pulses0Greater than 180A and less than 800A, and pulse width t0 greater than 400us and less than 100 ms.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811135190.2A CN109202217B (en) | 2018-09-28 | 2018-09-28 | Gas shielded welding machine convenient to strike arc |
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| CN201811135190.2A CN109202217B (en) | 2018-09-28 | 2018-09-28 | Gas shielded welding machine convenient to strike arc |
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| CN111347127B (en) * | 2020-02-27 | 2021-03-23 | 广州亦高电气设备有限公司 | Cold welding control circuit and method and argon arc welding machine |
| CN116441674B (en) * | 2023-06-14 | 2023-08-15 | 苏芯物联技术(南京)有限公司 | High-precision welding airflow control system and control method |
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| JP4995698B2 (en) * | 2007-11-12 | 2012-08-08 | 株式会社ダイヘン | Stitch pulse welding equipment |
| JP5450221B2 (en) * | 2010-04-14 | 2014-03-26 | 株式会社神戸製鋼所 | High current density gas shielded arc welding method |
| CN102275029B (en) * | 2011-07-19 | 2013-05-15 | 江苏科技大学 | Rocking-arc narrow-gap vertical gas metal arc welding method |
| CN104493329B (en) * | 2014-11-20 | 2016-08-31 | 上海沪临重工有限公司 | Back chipping backing weld method is exempted from a kind of modulation pulse |
| CN106735746A (en) * | 2016-12-29 | 2017-05-31 | 上海通用重工集团有限公司 | Gas-shielded welder |
| CN206464675U (en) * | 2016-12-29 | 2017-09-05 | 上海通用重工集团有限公司 | Gas-shielded welder |
| 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 |
| CN106862731B (en) * | 2017-02-21 | 2021-06-25 | 上海通用重工集团有限公司 | DC pulse argon arc welding machine |
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Denomination of invention: Gas shielded welding machine for easy arc starting Effective date of registration: 20231026 Granted publication date: 20210305 Pledgee: Bank of Shanghai Co.,Ltd. Jing'an Sub branch Pledgor: SHANGHAI TAYOR WELDING MACHINE Co.,Ltd. Registration number: Y2023310000676 |