CN103658947A - Protective control method for welding device - Google Patents
Protective control method for welding device Download PDFInfo
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- CN103658947A CN103658947A CN201310367103.7A CN201310367103A CN103658947A CN 103658947 A CN103658947 A CN 103658947A CN 201310367103 A CN201310367103 A CN 201310367103A CN 103658947 A CN103658947 A CN 103658947A
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- temperature sensor
- welding
- temperature
- contact
- welding torch
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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
- B23K9/095—Monitoring or automatic control of welding parameters
- B23K9/0956—Monitoring or automatic control of welding parameters using sensing means, e.g. optical
-
- 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
-
- 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
- B23K10/00—Welding or cutting by means of a plasma
- B23K10/006—Control circuits therefor
-
- 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
- B23K9/24—Features related to electrodes
- B23K9/28—Supporting devices for electrodes
- B23K9/285—Cooled electrode holders
-
- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding Control (AREA)
- Arc Welding In General (AREA)
Abstract
The present invention provides a protective control method for a welding device, thereby preventing number increase of wirings for connecting a welding power supply (PS) and a welding torch (WT) in arranging a temperature sensor (HD) in the welding torch (WT) for preventing burndown. When a starting switch (SW) is changed to a switched-on state, welding current (Iw) is introduced. The temperature sensor (HD) detects temperature of reflux water (62) in the water-cooled welding torch (WT). When the temperature of the reflux water (62) is above a reference temperature value, a contact (HR) of the temperature sensor (HD) is changed to a switched-off state for stopping energization of the welding current (Iw). The contact (HR) of the temperature sensor (HD) is connected with the starting switch (SW) in series. Switching-on state or switching-off state of the starting switch (SW) and the contact of the temperature sensor are determined based on variation of resistance of a serial circuit between the starting switch (SW) and the contact (HR) of the temperature sensor (HD). Therefore, number of wirings of a welding torch cable is not increased, thereby preventing cost increase of the welding torch (WT).
Description
Technical field
The present invention relates to by temperature sensor detect water-cooled welding torch recirculation water temperature and when the temperature of this recirculation water has reached temperature reference value, stop the protection control method of welder of the energising of welding current.
Background technology
At Plasma Welding, TIG welding, co3 gas arc welding, connect, MAG welds, MIG welds etc. among the welding torch using in arc welding, have water-cooled welding torch.It is inner that this water-cooled welding torch makes the cooling fluids such as water (hereinafter referred to as cooling water) flow into welding torch, and make to flow out after its circulation, thus cooling welding torch main body, nozzle etc.Among the circulation of this cooling water, the situation that cooling water circulation machine carries out is set more.In the case, by the cooled cooling water of cooling water circulation machine, be sent to welding torch, the recirculation water having warmed when welding torch inner loop is back to cooling water circulation machine.
If because the surpassing of utilization rate, the rising of environment temperature, the welding torches such as underfed of cooling water become over temperature, welding torch can scaling loss and is become and can not use sometimes.In order to prevent from becoming such state, by temperature sensor, detected the temperature of recirculation water of welding torch the protection control method of welder of energising that stops welding current when the temperature of this recirculation water has reached predetermined temperature reference value from just carry out (for example, with reference to patent documentation 1) in the past.By this protection control method, the time point that has reached the temperature reference value of welding torch not burning due to the recirculation water temperature rising relevant to the temperature of welding torch just stops welding forcibly, therefore can prevent the scaling loss of welding torch.
Look-ahead technique document
Patent documentation
Patent documentation 1: TOHKEMY 2008-229644 communique
(problem that invention will solve)
Welding torch is connected with the source of welding current by welding torch cable, also comprises and carry water pipe and backflow water pipe in this welding torch cable.In addition, the source of welding current is connected by conveying water pipe and backflow water pipe with cooling water circulation machine.Therefore, carry water according to the sequential flowing of cooling water circulation machine → source of welding current → welding torch, recirculation water returns according to the order of welding torch → source of welding current → cooling water circulation machine.
In order to detect exactly the temperature of welding torch, rise, temperature sensor need to detect the temperature of the recirculation water of welding torch inside.This be due to, if detect the temperature of recirculation water in the inside of the source of welding current or cooling water circulation machine, because temperature during returning at recirculation water can decline, thereby the temperature that can not detect exactly welding torch rises.Yet, if temperature sensor is arranged to the inside of welding torch,, for the state of temperature sensor (whether the temperature of recirculation water is more than temperature reference value) is notified to the source of welding current, need in welding torch cable, append 2 control cables that the source of welding current is connected with temperature sensor.If the quantity of control cables increases, the cost that produces welding torch cable uprises such problem.And then if the quantity of control cables increases, the cut-out accident due to roundabout grade also becomes and easily occurs.
Summary of the invention
For this reason; the object of the invention is to; even if provide a kind of at the inside of welding torch set temperature sensor, also can not make the wiring number of welding torch cable that the source of welding current is connected with welding torch increase by the state notifying of temperature sensor the protection control method to the welder of the source of welding current.
(for solving the means of problem)
In order to solve above-mentioned problem, the invention of technical scheme 1 is a kind of protection control method of welder, wherein, in using the arc welding of water-cooled welding torch, when being arranged at the firing switch of described welding torch, when being changed to closure state, off-state starts the energising of welding current, and by temperature sensor, detected the temperature of the recirculation water of described welding torch, when the temperature of this recirculation water becomes predetermined temperature reference value when above, the contact of described temperature sensor is changed to off-state from closure state, stop the energising of described welding current, the protection control method of described welder is characterised in that, described temperature sensor is arranged to the position that the temperature of the described recirculation water of welding torch inside is detected, and be connected in series the contact of described temperature sensor with described firing switch, the variation of the resistance value of the series circuit that the contact based on described firing switch and described temperature sensor forms, differentiate the disconnection closure state of the contact of described firing switch and described temperature sensor.
The invention of technical scheme 2 is on the basis of the protection control method of the welder of technical scheme 1 record, with the contact of described temperature sensor, resistor is set in parallel.
(invention effect)
According to the present invention, even at the inside of welding torch set temperature sensor, also can not make the wiring number of welding torch cable that the source of welding current is connected with welding torch increase by the state notifying of temperature sensor to the source of welding current.So the cost that can suppress welding torch uprises, and the probability of happening of cut-out accident that can suppress wiring uprises.
Accompanying drawing explanation
Fig. 1 is for implementing the pie graph of the plasma welding device of the related protection control method of embodiments of the present invention 1.
Fig. 2 is the equivalent circuit diagram of the series circuit that forms of the contact HR of firing switch SW in Fig. 1 and temperature sensor HD.
Fig. 3 is for implementing the pie graph of the plasma welding device of the related protection control method of embodiments of the present invention 2.
Fig. 4 is the equivalent circuit diagram of the series circuit that forms of the contact HR of firing switch SW in Fig. 3 and temperature sensor HD.
The specific embodiment
Below, with reference to accompanying drawing, embodiments of the present invention are described.
In the following description, take the plasma welding device of scaling loss that welding torch especially easily occurs is example.That is, in Plasma Welding, by son, by plasma nozzle constraint arc, carry out high density energy, therefore have the risk that can cause at once the scaling loss of welding torch when the cooling effect of welding torch declines.So, need to carry out protection fully and control.
[embodiment 1]
Fig. 1 is for implementing the pie graph of the plasma welding device of the related protection control method of embodiments of the present invention 1.Therefore in this Fig. 1, pipe arrangement and the present invention of plasma gas and protective gas do not have direct relation, in order to make accompanying drawing understandable and omit.Below, with reference to this Fig. 1, each construct is described.
The welding torch WT that dotted line surrounds consists of electrode 1, the protection nozzle 5 that surrounds the plasma nozzle 4 of this electrode 1 and surround this plasma nozzle 4.Electrode 1 is non-deflection type electrode, uses the situation of tungsten electrode more.The interior mobile plasma gas of plasma nozzle 4 (omitting diagram).In addition, the interior mobile protective gas of protection nozzle 5 (omitting diagram).Plasma gas and protective gas are used argon gas more.Plasma-arc 3 is retrained and is tightened up by plasma nozzle 4, between electrode 1 and mother metal 2, produces.Plasma nozzle 4 is made of copper, is provided with the stream that cooling water 6 is flowed through in inside.In addition, at welding torch WT, be provided with firing switch SW.This firing switch SW is the contact that normal off is opened, and becomes closure state when weld job person manually connects.In addition, in order to detect the temperature of the recirculation water 62 flowing out from plasma nozzle 4, in the inside of welding torch WT, be provided with temperature sensor HD.This temperature sensor HD is built-in with normally closed contact HR, in the temperature of recirculation water, becomes predetermined temperature reference value Ht when above, and contact HR becomes off-state.For this temperature sensor HD, can use thermostat, thermal protector etc.Temperature reference value Ht is configured to be less than because the surpassing of utilization rate, the rising of environment temperature are, the welding torch WT such as underfed of cooling water surpass the value of temperature not burning.Temperature reference value Ht is intrinsic value in the temperature sensor HD arranging.Temperature sensor HD has hysteresis quality, so temporary variations compares to and when temperature reference value Ht has declined set-point, returns to closure state in the temperature of recirculation water to the contact HR of off-state.
Cooling water circulation machine WC carries the conveying water pipe 71 that water 61 flows through to be connected with source of welding current PS by making, and the backflow water pipe 72 that recirculation water 62 is flow through is connected with source of welding current PS.The recirculation water 62 that the temperature that makes this cooling water circulation machine WC has risen is undertaken cooling and again as carrying water 61 to circulate by being located at inner pressure fan.The cooling water 6 of circulation is divided into carries water 61 and recirculation water 62.
Source of welding current PS is the power supply with constant current characteristic or droop characteristic, negative output is connected with the electrode 1 of welding torch WT with cable 83 via electric power, H output is connected with mother metal 2 via used for welding cable 9, and output welding current Iw and weldingvoltage Vw produce plasma-arc 3.In addition, carry water 61 from source of welding current PS via carrying water pipe 81 to flow into the stream of plasma nozzles 4, and via backflow water pipe 82, be back to source of welding current PS from the recirculation water 62 that the stream of plasma nozzle 4 flows out.Therefore, carry water 61 according to the sequential flowing of cooling water circulation machine WC → source of welding current PS → plasma nozzle 4, recirculation water 62 returns according to the order of plasma nozzle 4 → source of welding current PS → cooling water circulation machine WC.
With control cables 84, carry out connecting welding power ps and be located between the firing switch SW of welding torch WT, the contact HR of the other end of firing switch SW and temperature sensor HD is connected in series, and the other end of the contact HR of temperature sensor HD is connected with source of welding current PS by control cables 85.That is, the contact HR of firing switch SW and temperature sensor HD is connected in series.As mentioned above, firing switch SW is the contact that normal off is opened, and becomes closure state when being switched on.The contact HR of temperature sensor D is normally closed contact, and being becomes in recirculation water temperature the contact that temperature reference value Ht becomes off-state when above.The variation of the resistance value of the series circuit that the contact HR based on firing switch SW and temperature sensor HD forms, controls the output of source of welding current PS as follows.
1) when switching starting SW in order to start welding by weld job person, firing switch SW is changed to closure state from off-state.Now, because recirculation water temperature is less than temperature reference value Ht, so the contact HR of temperature sensor HD is kept closed.Therefore, the resistance value of the series circuit of the contact HR based on firing switch SW and temperature sensor HD roughly becomes 0 Ω.By resistance value, roughly become 0 Ω, thereby flow through control electric current in firing switch SW.Source of welding current PS differentiates to start output to it, and starts the energising (for the purpose of simplifying the description, having omitted striking when electric arc starts) of welding current Iw.
2) thus while keep to connect continuing welding due to firing switch SW, if more than recirculation water temperature becomes temperature reference value Ht, the contact HR of temperature sensor HD is changed to off-state.So the resistance value of the series circuit of the contact HR based on firing switch SW and temperature sensor HD becomes infinity.Therefore, the obstructed control electric current that becomes in firing switch SW.Source of welding current PS differentiates it, stops the energising that output stops welding current Iw.Thus, thus having obtained protection makes can not become and surpasses the situation that temperature melts scaling loss welding torch WT because of plasma nozzle 4.
) drop to than till the temperature of the low set-point of temperature reference value Ht to recirculation water temperature, the contact HR of temperature sensor HD remains open state, even if therefore switch starting SW, also obstructed welding current Iw.Thereby at the decline contact HR. of temperature sensor HD of recirculation water temperature, return to after closure state the right side switch starting SW, logical welding current Iw.
The welding torch cable that welding power ps is connected with welding torch WT comprises: carry water pipe 81, backflow water pipe 82, cable 83 and control cables 84,85 for electric power.
Fig. 2 is the equivalent circuit diagram of the series circuit that forms of the contact HR of firing switch SW in above-mentioned Fig. 1 and temperature sensor HD.The control power supply of constant voltage (for example 24V) for example, is connected with the 1st resistor R1 (10k Ω).The other end of the 1st resistor R1 is connected with one end of firing switch SW.The other end of firing switch SW is connected with one end of the normally closed contact HR of temperature sensor HD.The other end ground connection of contact HR.To between the 1st resistor R1 and firing switch SW, be made as test point.The resistance value of the series circuit that the contact HR of firing switch SW and temperature sensor D is formed is called series circuit resistance value.The voltage of test point is called to detection magnitude of voltage, the current value that flows through test point is called to detection current value.Control the inside that power supply, the 1st resistor R1 and setting position have been located at source of welding current PS.
While being off state due to firing switch SW, become off-state, therefore irrelevant with the state of the contact HR of temperature sensor HD, series circuit resistance value becomes infinity, and detecting magnitude of voltage becomes 24V, and detecting current value becomes 0A.When this state, the output of source of welding current PS will stop.When recirculation water temperature is less than temperature reference value Ht, the contact HR of temperature sensor HD is in closure state, if therefore think that under this state, firing switch SW is switched on and becomes closure state, series circuit resistance value roughly becomes 0 Ω, detecting magnitude of voltage becomes 0V, and detecting current value becomes 2.4mA.When this state, source of welding current PS becomes output and starts.At firing switch SW, be switched on and during in closure state, if thereby becoming the contact HR of the above temperature sensor HD of temperature reference value Ht, recirculation water temperature becomes off-state, series circuit resistance value becomes infinity, and detecting magnitude of voltage becomes 24V, and detecting current value becomes 0A.When this state, the output of source of welding current PS will stop.Therefore the state that, source of welding current PS can differentiate the contact HR of firing switch SW and temperature sensor HD by detection magnitude of voltage or the detection current value of the variation based on series circuit resistance value.Source of welding current PS can based on this differentiate result to output stop or starting control.
[embodiment 2]
Fig. 3 is for implementing the pie graph of the plasma welding device of the related protection control method of embodiments of the present invention 2.This Fig. 3 is corresponding with Fig. 1.This Fig. 3 has appended in parallel the figure after the 2nd resistor R2 with the contact HR of temperature sensor HD in Fig. 1.In addition identical with Fig. 1, description will be omitted.
Fig. 4 is the equivalent circuit diagram of the series circuit that forms of the contact HR of firing switch SW in above-mentioned Fig. 3 and temperature sensor HD.This Fig. 4 is corresponding with Fig. 2.This Fig. 4 has appended in parallel for example, figure after the 2nd resistor (10k Ω) with contact HR in Fig. 2, in addition identical with Fig. 2.
Firing switch SW becomes off-state while being off state, therefore irrelevant with the state of the contact HR of temperature sensor HD, series circuit resistance value becomes infinity, and detecting magnitude of voltage becomes 24V, and detecting current value becomes 0A.When this state, the output of source of welding current PS will stop.When recirculation water temperature is less than temperature reference value Ht, the contact HR of temperature sensor HD is in closure state, therefore if under this state, firing switch SW is switched on and becomes closure state, series circuit resistance value roughly becomes 0 Ω, and detecting magnitude of voltage becomes 0V, and detecting current value becomes 2.4mA.When this state, source of welding current PS becomes output and starts.At firing switch SW, be switched on and during in closure state, if thereby becoming the contact HR of the above temperature sensor HD of temperature reference value Ht, recirculation water temperature becomes off-state, different during from Fig. 2, series circuit resistance value becomes 10k Ω, detecting magnitude of voltage becomes 12V, and detecting current value becomes 1.2mA.When this state, temperature protection is moved, so the output of source of welding current PS will stop.So, the in the situation that of Fig. 4, different from the situation of Fig. 2, source of welding current PS can differentiate temperature protection and move.So source of welding current PS, except the control that stops or starting of output, can also move by reporting temperature protection based on the lighting of abnormal show lamp, audible alarm etc.
According to present embodiment, temperature sensor is arranged to the position that the temperature of the described recirculation water of welding torch inside is detected, the contact of described temperature sensor and firing switch are connected in series, and the disconnection closure state of the contact of firing switch and temperature sensor is differentiated in the variation of the resistance value of the series circuit of the composition of the contact based on firing switch and temperature sensor.Thus, the source of welding current can not make the wiring number of welding torch cable increase the state of differentiating the contact of firing switch and temperature sensor.Therefore, in the present embodiment, even at the inside of welding torch set temperature sensor, also can not make the wiring number of welding torch cable that the source of welding current is connected with welding torch increase by the state notifying of temperature sensor to the source of welding current.So the cost that can suppress welding torch uprises, the probability of happening that can suppress the cut-out accident of wiring uprises.
Although illustrated that in the above-described embodiment arc welding is the situation as the Plasma Welding of on-consumable formula electrode arc welding, the present invention can also be applied to use other on-consumable formula electrode arc welding, the welding of deflection type electrode arc of water-cooled welding torch.
Symbol description
1 electrode
2 mother metals
3 plasma-arcs
4 plasma nozzles
5 protection nozzles
6 cooling waters
9 used for welding cables
61 carry water
62 recirculation waters
71 carry water pipe
72 backflow water pipes
81 carry water pipe
82 backflow water pipes
83 electric power cables
84,85 control cables
HD temperature sensor
The contact of HR temperature sensor
Ht temperature reference value
Iw welding current
The PS source of welding current
R1 the 1st resistor
R2 the 2nd resistor
SW firing switch
Vw weldingvoltage
WC cooling water circulation machine
WT welding torch
Claims (2)
1. the protection control method of a welder; wherein; in using the arc welding of water-cooled welding torch; when being arranged at the firing switch of described welding torch, when being changed to closure state, off-state starts the energising of welding current; by temperature sensor, detected the temperature of the recirculation water of described welding torch, when the temperature of this recirculation water becomes predetermined temperature reference value when above, the contact of described temperature sensor is changed to off-state from closure state; stop the energising of described welding current
The protection control method of described welder is characterised in that,
Described temperature sensor is arranged to the position that the temperature of the described recirculation water of welding torch inside is detected, and be connected in series the contact of described temperature sensor with described firing switch, the variation of the resistance value of the series circuit that contact based on described firing switch and described temperature sensor forms, differentiates the disconnection closure state of the contact of described firing switch and described temperature sensor.
2. the protection control method of welder according to claim 1, is characterized in that,
With the contact of described temperature sensor, resistor is set in parallel.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012202390A JP2014054665A (en) | 2012-09-14 | 2012-09-14 | Protection control method of welding device |
| JP2012-202390 | 2012-09-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103658947A true CN103658947A (en) | 2014-03-26 |
| CN103658947B CN103658947B (en) | 2017-03-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310367103.7A Active CN103658947B (en) | 2012-09-14 | 2013-08-21 | The protection control method of welder |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2014054665A (en) |
| KR (1) | KR102053464B1 (en) |
| CN (1) | CN103658947B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4230928A (en) * | 1978-12-18 | 1980-10-28 | Wolff Manufacturing Company | Method and machine for rebuilding track roller assemblies |
| DE3434701A1 (en) * | 1984-09-21 | 1986-06-05 | Messer Griesheim Gmbh, 6000 Frankfurt | Burner, in particular electric arc and/or plasma burner for welding and cutting |
| JPH09192842A (en) * | 1996-01-08 | 1997-07-29 | Nippon Steel Weld Prod & Eng Co Ltd | Plasma machine |
| US20050016978A1 (en) * | 2003-07-23 | 2005-01-27 | Stein Alan E. | Method and apparatus to adaptively cool a welding-type system |
| US20050205542A1 (en) * | 2004-03-17 | 2005-09-22 | Decoster Albert J | Torch connection detection system and method |
| JP2008229644A (en) * | 2007-03-19 | 2008-10-02 | Matsushita Electric Ind Co Ltd | Electric equipment |
| JP2008279489A (en) * | 2007-05-14 | 2008-11-20 | Daihen Corp | Arc machining apparatus |
| KR20120005085A (en) * | 2010-07-08 | 2012-01-16 | 대우조선해양 주식회사 | A cooling device for plasma arc welding |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000084668A (en) * | 1998-09-11 | 2000-03-28 | Hitachi Via Mechanics Ltd | Water cooled torch for arc welding |
-
2012
- 2012-09-14 JP JP2012202390A patent/JP2014054665A/en active Pending
-
2013
- 2013-08-21 CN CN201310367103.7A patent/CN103658947B/en active Active
- 2013-09-10 KR KR1020130108327A patent/KR102053464B1/en active IP Right Grant
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4230928A (en) * | 1978-12-18 | 1980-10-28 | Wolff Manufacturing Company | Method and machine for rebuilding track roller assemblies |
| DE3434701A1 (en) * | 1984-09-21 | 1986-06-05 | Messer Griesheim Gmbh, 6000 Frankfurt | Burner, in particular electric arc and/or plasma burner for welding and cutting |
| JPH09192842A (en) * | 1996-01-08 | 1997-07-29 | Nippon Steel Weld Prod & Eng Co Ltd | Plasma machine |
| US20050016978A1 (en) * | 2003-07-23 | 2005-01-27 | Stein Alan E. | Method and apparatus to adaptively cool a welding-type system |
| US20050205542A1 (en) * | 2004-03-17 | 2005-09-22 | Decoster Albert J | Torch connection detection system and method |
| JP2008229644A (en) * | 2007-03-19 | 2008-10-02 | Matsushita Electric Ind Co Ltd | Electric equipment |
| JP2008279489A (en) * | 2007-05-14 | 2008-11-20 | Daihen Corp | Arc machining apparatus |
| KR20120005085A (en) * | 2010-07-08 | 2012-01-16 | 대우조선해양 주식회사 | A cooling device for plasma arc welding |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2014054665A (en) | 2014-03-27 |
| KR20140035833A (en) | 2014-03-24 |
| KR102053464B1 (en) | 2019-12-06 |
| CN103658947B (en) | 2017-03-01 |
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