CN101077546B - Arc welding equipment and method - Google Patents

Arc welding equipment and method Download PDF

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Publication number
CN101077546B
CN101077546B CN2006100826572A CN200610082657A CN101077546B CN 101077546 B CN101077546 B CN 101077546B CN 2006100826572 A CN2006100826572 A CN 2006100826572A CN 200610082657 A CN200610082657 A CN 200610082657A CN 101077546 B CN101077546 B CN 101077546B
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arc
circuit
welding
electric current
base material
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CN101077546A (en
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石井秀雄
池田哲朗
壇上谦三
木下敦史
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Sansha Electric Manufacturing Co Ltd
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Sansha Electric Manufacturing Co Ltd
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Abstract

The arc welding apparatus includes one main power source circuit to output arc current, one control circuit for controlling the main power source circuit and one high frequency voltage generator circuit. During the apparatus is powered on, the operation switch is turned, the control circuit triggers the main power source circuit to output high voltage and triggers the high frequency voltage generator circuit to generate high frequency voltage. With the superposing of the high voltage on the high frequency voltage, the control circuit makes the welding arc current flow through the welding torch and the base material. Then, the operation switch is turned off and the control circuit makes the arc striking current flow through the welding torch and the base material. After that, the operation switch is turned on, and the control circuit triggers the main power source circuit to output high voltage to allow smooth arc transition.

Description

Arc welding equipment and method
Technical field
The present invention relates to weld the equipment and the method for the for example substrate of iron (base) material.The invention particularly relates to convenient arc welding equipment and method of on base material, checking pad.
Background technology
According to the type of arc welding method, non-consumable (nonconsumable) electrode is moved and approaches base material, between electrode and base material, has applied the high voltage that is superimposed with high frequency voltage on it.Then, move to electrode and leave base material, between electrode and base material, form electric arc, use its heat melts base material thus.Yet such method needs skilled operative skill, because its intrinsic difficulty is the establishment molten puddle (molten weld pool) at required pad place.
Consider the problems referred to above, JP H10-006006A discloses a kind of arc welding equipment, and it is suitable for indicating the pad on the workpiece to the operator.
Prior art equipment provides slit (slit) light source of the pad that is used to throw light on, and is used to monitor the arc monitor of molten puddle, and image synthesizer.The equipment of prior art is suitable for the operator and on the display screen of arc monitor, observes pad.
Yet prior art equipment has following problem.It is complicated that the outfit of slit and arc monitor has prior art equipment, and therefore expensive structure.And the equipment of prior art makes the operator during welding operation, to replace and checks repeatedly and each watch-dog and base material caused relatively poor operability.
Consider the problems referred to above, characteristics of the present invention provide a kind of cheap and exercisable arc welding equipment and method, and its permission is suitably indicated the pad on the base material to the operator.
Another characteristics of the present invention provide a kind of arc welding equipment and method, and it prevents to produce the high-frequency noise in arc welding operating period.
Another characteristics of the present invention provide a kind of arc welding equipment and method, and it allows to have electric arc transition stably (transition) in arc welding operating period.
Summary of the invention
Arc welding equipment according to an aspect of inventing comprises main power circuit, console switch, control circuit.Main power circuit is suitable between welding torch (welding torch) and base material, applying arc voltage, has therefore flow through the welding arc electric current therein.Console switch is suitable for the operator to be used, so that the indication that produces welding arc (hereinafter being called the starting the arc (arc start) indication) to be provided.Control circuit is suitable for controlling main power circuit, and (pilot arc current) flows through welding torch (torch) and base material thereby main power circuit makes the striking electric current, up to starting the arc indication is provided.The striking electric current has the value littler than welding arc electric current.
Along with the striking electric current flows through welding torch and base material, striking is established, and with the illumination base material, allows the operator can observe the pad on the base material thus.
According to invention on the other hand, this equipment comprises that further high frequency voltage produces circuit, to produce high frequency voltage.Control Current Control high frequency voltage produces circuit, makes to have only when behind the opening of device, when through console switch first starting the arc indication being provided, and high frequency voltage produces circuit and just produces the high frequency voltage that is superimposed upon on the arc voltage.
When first starting the arc indication is provided, between welding torch and base material, apply the arc voltage that is superimposed with high frequency voltage, therefore be convenient to produce welding arc.The striking current paths continues to exist, up to another starting the arc indication is provided.Therefore, when another starting the arc indication was provided, therefore the striking electric current allowed to form do not have high frequency voltage to be superimposed upon the smooth transition from the striking to the welding arc on the arc voltage.Particularly, this equipment is feasible to be had only after device start, and how frequently high frequency voltage just is superimposed upon on the arc voltage, and need not consider the starting the arc and end the repetition of arc (arc stop) indication quilt.Therefore, this equipment has prevented the generation of high frequency noise.
Description of drawings
Fig. 1 shows the circuit diagram according to the arc welding equipment of inventive embodiment;
Fig. 2 shows the operation of being carried out by arc welding equipment;
Fig. 3 shows the operation of carrying out by according to the arc welding equipment of another embodiment that invents.
The specific embodiment
Fig. 1 shows the circuit diagram of electric arc welding equipment 20 according to an embodiment of the invention.
With reference to this figure, equipment 20 comprises the main power circuit 21 that is used to export arc current, and the control circuit 22 that is used for control circuit 21.
Circuit 21 has power switch SW, rectifier circuit 1, phase inverter (inverter) circuit 2 and output circuit 23.The power supply input from AC power supplies is opened or closed to switch SW.The AC power supplies voltage that 1 pair in circuit is input to input INPUT carries out rectification.Circuit 2 comprises the conversion element that is used to change commutating voltage.Circuit 23 is provided, is used for passing to output 7 and output 8 to the output of circuit 2.Base material 10 links to each other with output 7, and welding torch 9 links to each other with output 8.Should be noted that semiconductor control element replacement circuit 1 alternatively.
Circuit 23 has inverter transformer 3, output rectifier 4, and smoothing circuit.Transformer 3 converts the output voltage of circuit 2 to predetermined voltage.The output voltage of 4 pairs of transformers 3 of rectifier carries out rectification.Smoothing circuit has reactor 5 and capacitor 6, for the steady output voltage of rectifier 4 provides level and smooth.
Equipment 20 comprises that further high frequency voltage produces circuit 13, transformer 14, magnetic test coil 16, and arc current testing circuit 17.Circuit 13 produces high frequency voltage.Transformer 14 is superimposed upon this high frequency voltage in the output of circuit 2, just the output HIGH voltage of circuit 23.Coil 16 is in series with output 8.Circuit 17 detects the electric current that flows through coil 16, confirms the value of arc current thus.
Circuit 22 has first control circuit 11, second control circuit 12 and the 3rd control circuit 18.Circuit 11 is suitable for the work of control circuit 1 and 2.Circuit 12 is suitable for the work of control circuit 13.Whether circuit 18 is in the state that opens or closes and exports control signals to circuit 11 and 12 according to arc current value and the console switch FS (will be described later) that circuit 17 detects.Circuit 11 opens or closes conversion element in response to pulsewidth modulation (PWM) control circuit to be controlled at through PWM in the circuit 2.
Equipment 20 has coupled console switch FS.Switch FS is the floor push (foot switch) with pedal, is used for the operator and depresses, so that the indication that produces welding arc (hereinafter being known as starting the arc indication) to be provided.Switch FS perhaps ends the arc signal to starting the arc signal and sends to circuit 18.Be in closed condition under the switch FS normal condition, send out only arc signal.When the operator depressed pedal, switch FS was unlocked, and sent out starting the arc signal.
Equipment 20 is worked in the following manner.
Fig. 2 shows the operation of being carried out by equipment 20.
When switch SW was opened, AC power supplies voltage was imported into circuit 1 and by circuit 1 rectification.Voltage after the rectification then is input to circuit 2.At this moment, switch FS is in the closed condition that pedal is not depressed.Therefore, circuit 11 circuits for triggering 2 not.
When making switch FS be in opening when depressing pedal, starting the arc signal is sent to circuit 18.Then, circuit 18 confirms whether switch FS is after equipment 20 is opened, to be unlocked for the first time.Particularly, circuit 18 confirms whether circuit 17 detects the null value arc current.The detection of null value arc current means that switch FS is unlocked for the first time after equipment 20 is opened.
Detect the null value arc current in case confirm circuit 17, circuit 18 just sends the control letter that is used to produce welding arc and number gives circuit 11 and 12.Therefore, circuit 11 and 12 difference circuits for triggering 2 and 13.The circuit 2 that is triggered has caused the high voltage output of the circuit 23 that between welding torch 9 and base material 10, applies.Simultaneously, the circuit 13 that is triggered makes transformer 14 be added to high frequency voltage on the high voltage.The high frequency voltage stack high voltage on it allows between welding torch 9 and base material 10, to have the steady foundation of the welding arc 15 of high temperature, produces the welding arc electric current I A of tens amperes (among the embodiment shown in Fig. 4 being 50 amperes) thus.The heat melts of electric arc 15 base material 10.So welding rod is placed in the electric arc 15 and is melted, thereby make base material 10 fusings.Circuit 12 almost removes the excitation of circuit 13 when electric arc 15 produces.
When closing switch FS, end the arc signal and be sent to circuit 18 through the relieving pedal.Circuit 18 then sends to circuit 11 to this control signal, thus promote to produce from about 0.5 ampere to about 2 amperes striking electric current I B.As the PWM control in 11 cycles time of implementation of circuit of pwm control circuit, wherein the conversion element in the circuit 2 is in for this time cycle and opens or closed condition, allow thus circuit 23 outputs from about 0.5 ampere to about 2 amperes small (minute) electric current.Circuit 18 also sends to circuit 12 to control signal, is used to remove the excitation of circuit 13.Therefore, 50 amperes welding arc electric current I A reduce to from about 0.5 ampere to about 2 amperes striking electric current I B.Striking electric current I B produces striking, and it has the insufficient heat for arc welding, but the adequate illumination of the pad on the base material 10 that is provided for throwing light on.Therefore, striking allows the operator in welding operation afterwards, clearly to observe pad.And molten metal is cured.
Then, when switch FS was unlocked once more, starting the arc signal was sent to circuit 18.Circuit 18 confirms whether circuit 17 detects the null value arc current.At this moment, 17 pairs of striking electric current I of circuit B detects.Therefore, circuit 18 sends to circuit 11 to the control signal that is used to produce welding arc, but does not send to circuit 12 to the control signal that is used for circuits for triggering 13.Yet in case circuit 11 circuits for triggering 2, the striking of between welding torch 9 and base material 10, having set up just carries out the transition to main welding arc immediately.
Repeat above-mentioned step, on the required part of base material 10, to realize welding.
FS is closed along with switch, sets up striking, with the pad on the illumination base material 10.Therefore, arc welding equipment 20 allows the operator when opening switch FS, easily to observe pad next time.And in the welding operation that relates to repeat switch switch FS, only after equipment 20 was unlocked, high frequency voltage produced circuit 13 and just is triggered.Therefore, equipment 20 produces very limited high frequency noise amount.In addition, when switch FS opened, high frequency voltage was applied in the striking of having set up.The steady formation of welding arc when therefore, equipment 20 is guaranteed on high pressure overlapped high-frequency voltage not.
Fig. 3 shows the method for controlling through according to the 3rd control circuit 18 of another embodiment that invents.
Work as switch SW, and switch FS subsequently is when opening, the 3rd control circuit 18 sends to second control circuit 12 to control signal, is used to trigger high frequency voltage and produces circuit 13.Simultaneously, circuit 18 sends to first control circuit 11 to this control signal, thereby promotes the output of striking electric current I B through output circuit 23.Be different from the embodiment shown in Fig. 2, circuit 11 triggers phase inverter circuit 2, thereby makes circuit 23 output striking electric current I B.Therefore form striking immediately, transmit striking electric current I B thus.Almost when high frequency voltage began to be superimposed upon on the high voltage, striking electric current I B rose.Be triggered from circuit 13, after the scheduled time T that is measured by the timer (not shown), circuit 18 sends to circuit 12 to control signal, is used to remove the excitation of circuit 13.
At this moment, circuit 18 also sends to circuit 11 to this control signal, thereby transmits the welding arc electric current I A from circuit 23.The striking smooth transition of therefore, between welding torch 9 and base material 10, having set up is to welding arc.The step of back is similar to the content among the embodiment shown in Fig. 2.
Scheduled time T can artificially be provided with alternatively.
Invention described here clearly can change with multiple mode.Such variation is not considered to depart from the spirit and scope of the present invention, and all this modifications all are conspicuous to those skilled in the art, and hopes to be included in the scope of accompanying claims.

Claims (7)

1. an arc welding equipment is used for through making the welding arc electric current carry out the arc welding process through welding torch and base material, and this equipment comprises;
Main power circuit, thus it is suitable for exporting and is used between welding torch and base material, producing the high voltage that welding arc flows through the welding arc electric current;
Console switch, it is suitable for being used by the operator, the starting the arc indication that produces welding arc to be provided or to end the arc indication; And
Control circuit, it is suitable for controlling main power circuit, thereby main power circuit makes its striking electric current flow through welding torch and base material, provide from console switch only arc indication to provide once more starting the arc indication during, the striking electric current has the value littler than welding arc electric current.
2. arc welding equipment according to claim 1 further comprises the high frequency voltage generation circuit that is suitable for producing high frequency voltage; And detection is through the checkout equipment of welding arc electric current between above-mentioned welding torch and the base material;
Wherein, Control circuit control high frequency voltage produces circuit; Thereby when console switch provides the starting the arc indication that produces welding arc; When the detected welding arc electric current of above-mentioned checkout equipment is zero, the indication of the starting the arc for the first time is provided after being judged as electric power starting, makes high frequency voltage produce the high frequency voltage that circuit produces and be superimposed upon on the above-mentioned high voltage.
3. arc welding equipment according to claim 1,
Wherein, main power circuit comprises:
Rectifier circuit is used for rectifier power source voltage;
Phase inverter circuit has the conversion element that is used to change commutating voltage;
Output circuit is used for sending to each output that is used for welding torch and connected base material to the output of phase inverter circuit, and
Wherein, control circuit comprises pwm control circuit, and it is suitable for opening or close conversion element according to pwm control signal.
4. arc welding equipment according to claim 1,
Wherein, control circuit control main power circuit is so that the scope of striking electric current is from 0.5 to 2 ampere.
5. one kind through making the welding arc electric current flow through the equipment that welding torch and base material are carried out the arc welding process, and this equipment comprises:
Main power circuit comprises:
Rectifier circuit is used for rectifier power source voltage;
Phase inverter circuit is used to change commutating voltage; And
Output circuit is used for sending to each output that is used for welding torch and connected base material to the output of phase inverter circuit;
High frequency voltage produces circuit, is used to produce high frequency voltage;
Overlapping portion is used for overlapped high-frequency voltage in the output of phase inverter circuit;
The test section is used to detect the arc electric current through welding torch and base material, and the test section links to each other with output circuit:
Console switch is suitable for being used by the operator, so that the starting the arc that produces welding arc indication to be provided, perhaps is used to extinguish the only arc indication of welding arc; And
Control circuit is suitable for controlling main power circuit and high frequency voltage generation circuit according to each output of test section and console switch;
Wherein:
The null value arc current is detected in the test section when starting the arc indication is provided through console switch; Control circuit triggers high frequency voltage in the preset time section and produces circuit; Make overlapping portion overlapped high-frequency voltage on phase inverter circuit; Simultaneously also trigger phase inverter circuit, make phase inverter circuit output welding arc electric current;
When only arc indication was provided through console switch, control circuit triggered phase inverter circuit, the striking electric current that makes phase inverter circuit output have littler value than arc-welding electric current;
The striking electric current is detected in the test section when starting the arc indication is provided through console switch, and control circuit triggers phase inverter circuit, makes phase inverter circuit output arc-welding electric current, does not produce circuit and do not trigger high frequency voltage.
6. arc welding method, through making the welding arc electric current flow through welding torch and base material is carried out the arc welding process, this method may further comprise the steps:
Provide only from the operator that the arc indication makes the striking electric current flow through welding torch and base material from main power circuit to providing between starting the arc prescribed phase once more, the striking electric current has the value littler than welding arc electric current; And
When the operator transmits starting the arc indication, make the welding arc electric current flow through welding torch and base material from main power circuit.
7. arc welding method according to claim 6 further may further comprise the steps:
When the operator provides the starting the arc that does not have the striking electric current to pass through to indicate, overlapped high-frequency voltage in the output of main power circuit, thus produce the high voltage that is used to generate welding arc; And
Between welding torch and base material, apply high voltage, thereby make the welding arc electric current flow through welding torch and base material.
CN2006100826572A 2006-05-24 2006-05-24 Arc welding equipment and method Active CN101077546B (en)

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Application Number Priority Date Filing Date Title
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CN101077546B true CN101077546B (en) 2012-05-23

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101986370B (en) * 2009-07-29 2012-06-13 上海工程技术大学 Arc striking method for electric arc welding simulation training machine
CN101696987B (en) * 2009-10-16 2011-12-28 无锡市南方电器制造有限公司 Device for detecting voltage of TIG welding with high frequency striking arc
US9333582B2 (en) * 2012-11-07 2016-05-10 Lincoln Global, Inc. Method and system to control heat input in a welding operation
CN111761170A (en) * 2019-10-31 2020-10-13 哈尔滨工业大学（威海） Special observation protection device and method for electric arc additive process

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3696227A (en) * 1970-09-21 1972-10-03 Weld Record Corp Stud welding gun method
CN2034493U (en) * 1988-05-07 1989-03-22 齐宝华 Energy-saving arc welding machine
CN1044426A (en) * 1989-12-01 1990-08-08 镇江船舶学院 Transistorized arch welding inverter
DD300866A7 (en) * 1990-03-09 1992-08-20 Finsterwalde Schweisstechnik CIRCUIT ARRANGEMENT FOR CONTROLLING WELDING CURRENTS
CN2145087Y (en) * 1992-10-27 1993-11-03 上海工程技术大学 Electric-arc welding device
CN2258445Y (en) * 1996-02-26 1997-07-30 齐军 Arc strike device for electric arc welding
CN1597222A (en) * 2004-09-21 2005-03-23 王梅丰 Method of tungsten electrode argon arc welding using carbon dioxide welding power source and welding device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3696227A (en) * 1970-09-21 1972-10-03 Weld Record Corp Stud welding gun method
CN2034493U (en) * 1988-05-07 1989-03-22 齐宝华 Energy-saving arc welding machine
CN1044426A (en) * 1989-12-01 1990-08-08 镇江船舶学院 Transistorized arch welding inverter
DD300866A7 (en) * 1990-03-09 1992-08-20 Finsterwalde Schweisstechnik CIRCUIT ARRANGEMENT FOR CONTROLLING WELDING CURRENTS
CN2145087Y (en) * 1992-10-27 1993-11-03 上海工程技术大学 Electric-arc welding device
CN2258445Y (en) * 1996-02-26 1997-07-30 齐军 Arc strike device for electric arc welding
CN1597222A (en) * 2004-09-21 2005-03-23 王梅丰 Method of tungsten electrode argon arc welding using carbon dioxide welding power source and welding device

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