CN101396756A - Double-electrode arc welding method - Google Patents
Double-electrode arc welding method Download PDFInfo
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- CN101396756A CN101396756A CNA2008101491274A CN200810149127A CN101396756A CN 101396756 A CN101396756 A CN 101396756A CN A2008101491274 A CNA2008101491274 A CN A2008101491274A CN 200810149127 A CN200810149127 A CN 200810149127A CN 101396756 A CN101396756 A CN 101396756A
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Abstract
The present invention provides a double-electrode electric arc welding method which can reduce the dissolved oxygen amount in the welding part. A welding gun which is provided with thread (W) for feeding the welded parent metal (P) and non-consumable electrodes that are collocated to a concentric shape with a mode of surrounding the thread (W) is used for generating GMA electrical arc (6a) between the thread and the welded parent metal (P). Furthermore a plasma arc (6b) is formed between the non-consumable electrode and welded parent metal (P). The central gas (Gc) is supplied with a mode of directly surrounding the GMA electrical arc (6a). The protecting gas (Gs) is supplied to the outside of a concentric shaft for the central gas (Gc) which is an insert gas, and the protecting gas (Gs) is the mixture of insert gas and reducing gas. According to the composition, the oxygen dissolved into the fused bath (Mp) can be eliminated for reducing the dissolved oxygen amount of the welding seam (Wp), thereby increasing the low-temperature flexibility of the welding seam (Wp).
Description
Technical field
The present invention relates to use the welding gun of consumable electrode and non-melt electrode, produce the double-electrode arc welding method of consumable electrode electric arc and non-melt electrode arc.
Background technology
Now propose to have and carry out the limit simultaneously as consumable electrode supply silk limit generation consumable electrode electric arc, the scheme (for example, with reference to patent documentation 1) that connects with the double-electrode arc welding that uses plasma gas such as Ar for example to surround the non-melt electrode arc of consumable electrode electric arc.This method of silk after the two provides heat and supply with fusing welding base metal from consumable electrode electric arc and non-melt electrode arc is applicable to the high efficiency welding of welding with than speed of welding faster.In the formation that patent documentation 1 is put down in writing, its purpose is to shield above-mentioned consumable electrode electric arc by air, and produces above-mentioned non-melt electrode arc, supplies with plasma gas in the mode of surrounding above-mentioned consumable electrode electric arc.In addition, supply with protective gas in the mode of surrounding above-mentioned non-melt electrode arc.Plasma gas and protective gas as these usually use inert gases such as Ar.
For example, storage as the liquefied natural gas body of cryogenic substance (below, LNG container LNG), the low-temperature flexibility of having relatively high expectations.Be meant under low temperature that as low-temperature flexibility certain parts is received when impacting and is difficult to break, or viscosity is strong far below normal temperature.Therefore, when building the LNG container, when using welding as the joint method of iron and steel, the low-temperature flexibility that this weld part is also had relatively high expectations.In order to improve the low-temperature flexibility of weld part, the amount (soluble oxygen content) that the oxygen of dissolving remains in the weld part when welding is low more good more.But, in welding process, being in the molten bath of molten state in the part of mother metal, the oxygen of being introduced by above-mentioned plasma gas or protective gas in the deposite metal of high temperature dissolves easily.Therefore, even use inert gas such as Ar as above-mentioned plasma gas and protective gas, the soluble oxygen content of weld part is almost greater than 70ppm, and for example the junction surface of LNG container is abundant inadequately.
Patent documentation 1: Japanese kokai publication sho 63-168283 communique
Summary of the invention
The present invention considers the problems referred to above and makes that its purpose is to provide a kind of double-electrode arc welding method that can reduce the soluble oxygen content of weld part.
Double-electrode arc welding method provided by the present invention, use possesses the welding gun of consumable electrode and non-melt electrode, this consumable electrode is fed to the welding object thing, this non-melt electrode is configured to concentric shape according to the mode of surrounding this consumable electrode, between above-mentioned consumable electrode and welding object thing, produce consumable electrode electric arc, and between above-mentioned non-melt electrode and welding object thing, produce non-melt electrode arc, and the mode with the above-mentioned consumable electrode electric arc of direct encirclement is supplied with the 1st gas, and above-mentioned relatively the 1st gas is supplied with the 2nd gas in the concentric shafts outside, it is characterized in that, above-mentioned the 1st gas is inert gas, and above-mentioned the 2nd gas is the mist of inert gas and reducibility gas.
According to such formation,, spray above-mentioned the 2nd gas to by above-mentioned consumable electrode electric arc and the formed molten bath of above-mentioned non-melt electrode arc.The ratio that oxygen is dissolved in the molten bath of being made up of the deposite metal of high temperature is big.But,, can suitably remove the oxygen that is dissolved in the molten bath owing to be included in the reduction of the reducibility gas in above-mentioned the 2nd gas.Therefore, can reduce the soluble oxygen content of weld part, improve the low-temperature flexibility of weld part.
Other features and advantages of the present invention are described in detail following with reference to accompanying drawing, thus will be clearer and more definite.
Description of drawings
Fig. 1 is the system pie graph of an example of employed welder in the relevant double-electrode arc welding method of expression the present invention.
Fig. 2 is the ideograph of an example of the relevant double-electrode arc welding method of expression the present invention.
Symbol description among the figure:
The A welder
The B welding gun
Gc center gas (the 1st gas)
The Gp plasma gas
Gs protective gas (the 2nd gas)
Iwa GMA arc welding electric current
Iwb plasma arc welding current
The P welding base metal
PSM GMA electric arc welding power supply
The PSP plasma arc source of welding current
The VR voltage setting circuit
Vrm, the Vrp voltage setting signal
VwaGMA arc welding voltage
Vwb plasma arc weldingvoltage
W silk (consumable electrode)
1 contact core
2 plasma electrodes (non-melt electrode)
3 plasma nozzles
4 protective gas nozzles
5 thread delivering rollers
6a GMA electric arc (consumable electrode electric arc)
6b plasma arc (non-melt electrode arc)
Concrete form of implementation
Below, with reference to accompanying drawing to the specific description of preferred embodiment carrying out of the present invention.
Fig. 1 represents an example of employed welder in the relevant double-electrode arc welding method of the present invention.The welder A of present embodiment possesses welding gun B, GMA electric arc welding power supply (consumable electrode arc welding power source) PSM and the plasma arc source of welding current (the non-melt electrode arc source of welding current) PSP.Welding gun B be in protective gas nozzle 4 on concentric shafts the structure of configuring plasma nozzle 3, plasma electrode (non-melt electrode) 2 and contact core 1.
Between plasma electrode 2 and contact core 1, for example supply with center gas (the 1st gas) Gc such as Ar.Between plasma nozzle 3 and plasma electrode 2, supply with plasma gas Gp.From the gap between protective gas nozzle 4 and the plasma nozzle 3, supply with protective gas (the 2nd gas) Gs.In present embodiment,, supply with inert gases such as Ar as center gas Gc and plasma gas Gp.On the other hand, supply with the H that in inert gases such as Ar, sneaks into about 3%
2Or CH
4Mist behind the reducibility gas such as (methane) is as protective gas Gs.
From being arranged on the through hole of contact core 1, supply with silk W as consumable electrode.1 couple of silk W of contact core conducting.Silk W is by giving as the thread delivering roller 5 of drive source with motor M.Plasma electrode 2 for example is made of Cu or Cu alloy, by by the cooling water in the outer path of figure indirectly by water-cooled.Plasma nozzle 3 for example is made of Cu or Cu alloy, forms the passage by cooling water, thus by direct water-cooling.Welding gun B, under the state that is kept by robot (diagram slightly), P moves with respect to welding base metal usually.
GMA electric arc welding power supply PSM is to apply GMA arc welding voltage Vwa by contact core 1 between silk W and welding base metal P, thereby flows through the power supply of GMA arc welding electric current I wa.From voltage setting circuit VR voltage setting signal Vrm is sent to GMA electric arc welding power supply PSM.From GMA electric arc welding power supply PSM motor M is sent wire feed control signal Fc.When applying GMA arc welding voltage Vwa from GMA electric arc welding power supply PSM, silk W is+side.
Plasma arc source of welding current PSP is by apply the power supply that plasma arc weldingvoltage Vwb flows through plasma arc welding current Iwb between plasma electrode 2 and welding base metal P.From voltage setting circuit VR voltage setting signal Vrp is sent to plasma arc source of welding current PSP.When plasma arc source of welding current PSP applies plasma arc weldingvoltage Vwb, plasma electrode 2 is+side.
Then, the effect to the double-electrode arc welding method of present embodiment describes.
As shown in Figure 2, molten bath Mp is the part from the welding base metal P after the input heat melts of GMA electric arc 6a and plasma arc 6b, further becomes the part that the silk W that makes after the fusing accumulates.In such molten bath Mp, be in the state in the deposite metal that the oxygen that is involved in by center gas Gc, plasma gas Gp and protective gas Gs is dissolved into high temperature easily.Therefore, the denseer part of color among the Mp of molten bath is for having dissolved the part of more oxygen.
But,, in protective gas Gs, contain the H of reducibility gas in present embodiment
2Or CH
4These H
2Or CH
4When blowing to molten bath Mp, make the deposite metal reduction, remove the oxygen of dissolving.Thus, the lighter part of color in the Mp of molten bath, the oxygen amount of dissolving is obviously little.Its result, molten bath Mp is owing to the soluble oxygen content that solidifies the weld seam Wp that forms for example is lower than about 50ppm.Therefore, can improve the low-temperature flexibility of weld seam Wp, for example be suitable for the construction of LNG container.
When in protective gas Gs, sneaking into reducibility gas, increase the effect of so-called cleaning, removed oxide-film from the welding position easily.At this moment, exist to make GMA electric arc 6a and plasma arc 6b instability easily, make the misgivings of plasma arc 6b diffusion.But, as shown in Figure 1, stipulate its emission direction by plasma gas Gp, plasma nozzle 3.Because plasma nozzle 3 is a water-cooling structure,, tighten the effect of plasma arc 6b so bringing into play throttling plasma gas Gp.Thus, can make GMA electric arc 6a stable.Therefore, weld seam Wp becomes near the good shape of balance of sharply deepening the center at the section shape of width, and prevents that weld seam Wp from welding direction deviation undeservedly relatively.
The double-electrode arc welding method that the present invention is relevant is not to be confined to above-mentioned embodiment.The concrete formation of the double-electrode arc welding method that the present invention is relevant can freely be designed to various.
Being not limited to only sneak in protective gas Gs the formation of reducibility gas, also can be the formation of sneaking into reducibility gas in protective gas Gs and plasma gas Gp.Preferred backbone gas Gc, plasma gas Gp and protective gas Gs; obtain the outward appearance of good weld seam Wp; but the present invention is not limited thereto, also can only for example sneak into constituting of the center gas Gc that is made of inert gas and the protective gas Gs behind the reducibility gas for only supplying with.H
2And CH
4It is an example of reducibility gas.As the said reducibility gas of the present invention, use the gas that the oxygen that is dissolved among the Mp of molten bath can suitably reduce to be got final product by reduction.
Claims (1)
1, a kind of double-electrode arc welding method,
Use possesses the welding gun of consumable electrode and non-melt electrode, and this consumable electrode is fed to the welding object thing, and this non-melt electrode is configured to concentric shape according to the mode of surrounding this consumable electrode,
Between above-mentioned consumable electrode and welding object thing, produce consumable electrode electric arc, and between above-mentioned non-melt electrode and welding object thing, produce non-melt electrode arc, and the mode with the above-mentioned consumable electrode electric arc of direct encirclement is supplied with the 1st gas, and above-mentioned relatively the 1st gas is supplied with the 2nd gas in the concentric shafts outside, it is characterized in that
Above-mentioned the 1st gas is inert gas,
Above-mentioned the 2nd gas is the mist of inert gas and reducibility gas.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007247074 | 2007-09-25 | ||
| JP2007247074A JP5134325B2 (en) | 2007-09-25 | 2007-09-25 | Two-electrode arc welding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101396756A true CN101396756A (en) | 2009-04-01 |
Family
ID=40515732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101491274A Pending CN101396756A (en) | 2007-09-25 | 2008-09-12 | Double-electrode arc welding method |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5134325B2 (en) |
| CN (1) | CN101396756A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102029464A (en) * | 2010-12-30 | 2011-04-27 | 马国红 | Hot dip galvanized thin plate butt welding method |
| CN102126077A (en) * | 2010-01-12 | 2011-07-20 | 株式会社大亨 | Plasma metal inert gas arc welding method |
| CN110870389A (en) * | 2017-06-07 | 2020-03-06 | 爱克瑞威亚公司 | Plasma cutting method and cutting torch for implementing the method |
| CN110860691A (en) * | 2018-08-28 | 2020-03-06 | 蒋锐 | 3D printing nozzle for deposition extrusion of consumable material of plasma torch molten metal wire |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114226911A (en) * | 2021-12-22 | 2022-03-25 | 浙江巴顿焊接技术研究院 | Plasma-arc hybrid welding method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL166871C (en) * | 1969-04-04 | 1981-10-15 | Philips Nv | IMPROVEMENT OF ARC WELDING METHOD. |
| JPS49119847A (en) * | 1973-03-19 | 1974-11-15 | ||
| JPS59134600A (en) * | 1983-01-24 | 1984-08-02 | オリジン電気株式会社 | Method of removing coolant of plasma arc generator |
| JPS61262470A (en) * | 1985-05-16 | 1986-11-20 | Mitsubishi Heavy Ind Ltd | Gas shielded welding method |
| JPS63168283A (en) * | 1986-12-29 | 1988-07-12 | Toshiba Corp | Plasma mig welding equipment |
| JP3365720B2 (en) * | 1997-03-10 | 2003-01-14 | 日鐵溶接工業株式会社 | Swing type plasma torch |
-
2007
- 2007-09-25 JP JP2007247074A patent/JP5134325B2/en not_active Expired - Fee Related
-
2008
- 2008-09-12 CN CNA2008101491274A patent/CN101396756A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102126077A (en) * | 2010-01-12 | 2011-07-20 | 株式会社大亨 | Plasma metal inert gas arc welding method |
| CN102029464A (en) * | 2010-12-30 | 2011-04-27 | 马国红 | Hot dip galvanized thin plate butt welding method |
| CN110870389A (en) * | 2017-06-07 | 2020-03-06 | 爱克瑞威亚公司 | Plasma cutting method and cutting torch for implementing the method |
| CN110860691A (en) * | 2018-08-28 | 2020-03-06 | 蒋锐 | 3D printing nozzle for deposition extrusion of consumable material of plasma torch molten metal wire |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5134325B2 (en) | 2013-01-30 |
| JP2009078274A (en) | 2009-04-16 |
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Application publication date: 20090401 |