CN1012044B - Single-power plasma welding method with molten electrode protected by gas - Google Patents
Single-power plasma welding method with molten electrode protected by gasInfo
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- CN1012044B CN1012044B CN 88102665 CN88102665A CN1012044B CN 1012044 B CN1012044 B CN 1012044B CN 88102665 CN88102665 CN 88102665 CN 88102665 A CN88102665 A CN 88102665A CN 1012044 B CN1012044 B CN 1012044B
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Abstract
The present invention relates to a plasma MIG welding method which comprises: power is supplied to a plasma electric arc and an MIG electric arc by only one power supply simultaneously; a nonmelt electrode is provided concentrically with a nozzle hole of a welding torch, and the plasma electric arc is combusted between the nonmelt electrode and a workpiece; a melt electrode is obliquely fed in the plasma arc from the wall of the nozzle hole, and the MIG electric arc is combusted between the workpiece and the melt electrode connected with a nozzle and surrounded by the plasma electric arc. The present invention has the advantages of simple equipment and convenient control; meanwhile, the electrode arranging mode of the present invention largely increases the allowable electric current of the plasma arc and gives prominence to the characteristics of the plasma arc welding; therefore, the present invention is suitable for high-speed welding with great fusion depth. In addition, since the electric arcs are very stable, no splash is generated in the welding process. The present invention not only can be used for single-pass welding, but also can be used for multi-pass welding and resurfacing welding.
Description
The present invention relates to a kind of plasma-consumable electrode gas protection welding method and special-purpose welding torch thereof.
Plasma-gas metal-arc welding (hereinafter to be referred as plasma MIG welding) method is at first invented by Dutch Philips company welding laboratory.Previous method adopts and is arranged vertically consumable electrode (welding wire), make it concentric with nozzle, the setover electrode arrangement mode of non-melt electrode (tungsten electrode) adopts a steep characteristic power supply to be connected between non-melt electrode and the workpiece, in order to produce and stabilized plasma electric arc.Adopt a flat characteristic power supply to be connected between consumable electrode and the workpiece, to produce MIG arc-melting welding wire, this just mode that patent GB1338866 and GB1276110 adopt.Because in use there are deficiencies such as plasma-arc instability, easy current interruption and plasma current are little in said method, patent GB1556145 and DT3426410 improve said method.Non-melt electrode is made hollow annular electrode and nozzle coaxial arrangement, and consumable electrode enters in the plasma arc after vertically passing non-melt electrode of ring-type and nozzle with one heart.This mode has improved the stability of plasma-arc.
Though more than two kinds of plasma MIG welding methods different on version because they have all used two power supplys to give two electric arcs power supplies separately, make the welding equipment complexity, the control difficulty; And its stability is subjected to interactional influence the between two arcs, thereby influenced the reliability of the work of plasma arc.Again because of adopting about bigger MIG electric current (greater than 250A) and less plasma current (100A), so gas metal-arc welding (hereinafter to be referred as the MIG weldering) is with conspicuous characteristics, and the characteristics of plasma welding do not obtain bringing into play.
The objective of the invention is to above-mentioned traditional plasma MIG welding method is improved, make it the characteristics of outstanding plasma welding, improve the stability of plasma arc; Simplify welding equipment simultaneously, seek the new using method that a kind of plasma MIG welding connects and the welding torch of this method of use.
The present invention is achieved in that
Have two electrodes, by the high-frequency arc strike mode, MIG arc between the plasma arc that produces between non-melt electrode and the workpiece and consumable electrode and workpiece is worked simultaneously, when MIG electric arc is in plasma MIG welding among the encirclement of plasma arc and connects, only power simultaneously to plasma arc and two electric arcs of MIG arc with a power supply.Non-melt electrode and torch-tip hole arranged concentric, plasma arc burns between non-melt electrode and workpiece, then the aperture from the nozzle hole wall is oblique sends into the plasma arc for consumable electrode, the MIG arc burning and is surrounded by plasma-arc between the consumable electrode and workpiece that link to each other with nozzle.In the present invention, the power supply and the current regulator that comprise a steep characteristic with a power supply simultaneously to the electric power system of two electric arc power supplies.One utmost point (negative pole) of power supply is divided into two-way, wherein one the tunnel links to each other with non-melt electrode, another road links to each other with nozzle through current regulator, consumable electrode retreads in sending into plasma arc through the wire feed hole on the nozzle wall again, another utmost point (positive pole) of power supply directly links to each other with workpiece, regulate the current regulator in this system, can regulate the size of current of the current potential and the MIG arc of welding wire.
Use single-power plasma MIG welding method and custom-designed special-purpose welding torch, non-melt electrode and nozzle all adopt direct water-cooling, and the compression aperture of nozzle is less, with the compression plasma-arc.In this special-purpose welding torch, non-melt electrode places the nozzle bore top coaxially; One wire feed aperture is arranged, in order to the oblique consumable electrode of sending on the water-cooled nozzle hole wall; Nozzle is used as the ignition tip of welding wire again both as the compression plasma-arc.
The present invention is because the steep characteristic power supply that only adopts a routine is given two electric arcs power supplies simultaneously, thereby makes simplified equipment, and control is convenient; Simultaneously owing on the arrangement of electrode, take the mode of non-melt electrode and nozzle bore arranged concentric, consumable electrode deflection layout, thereby the electric current allowable of plasma arc is increased greatly (Ip can reach more than the 400A), given prominence to the characteristics of PLASMA ARC WELDING.The mode of metal transfer of MIG arc has short circuit, drips shape and three kinds of forms of jet, and just can realize spray transfer when very little welding wire electric current (as Iw=20A).When adopting mode of the present invention to weld, electric arc is very stable, and the metal transfer under three kinds of forms does not all have and splashes.The penetration capacity of plasma arc is strong simultaneously, is suitable for the rapid welding of big fusion penetration.
The concrete scheme that realizes the inventive method is provided by accompanying drawing and embodiment.
Accompanying drawing is for realizing the installation drawing of the inventive method.
Below in conjunction with a kind of details and working condition thereof that realizes the device of the inventive method of description of drawings:
In welding torch lower gun body (18), non-melt electrode (6) (as tungsten-cerium electrode) is arranged on the axis of welding torch and is concentric with nozzle bore (19).Plasma arc burns between non-melt electrode (6) and workpiece (16), and is subjected to the compression of nozzle bore (19), to produce stronger plasma arc.The oblique layout of consumable electrode (welding wire) (14), driving wire feed rolls (13) by motor (12) sends into its wire feed hole (17) from the nozzle hole wall the plasma-arc (9), so just fix the contact point between plasma arc and the welding wire, thereby fixed the electric potential relation of the two.MIG arc (15) burning is between welding wire (14) and the workpiece (16) and be in etc. among the encirclement of arc of recess (9).Electric power system in the inventive method comprises power supply (1) and current regulator (11) (as the welding resistance box).One utmost point (positive pole) of steep characteristic power supply (1) is connected on the workpiece (16) through switch (8), and another utmost point (negative pole) is divided into two-way, wherein one the tunnel directly is connected on the cold water pipe (20) of non-melt electrode (6); Another road is connected on the welding torch lower gun body (18) through current regulator (11), switch (10), actual like this is to have received on the consumable electrode (14), non-melt electrode (6) and nozzle (7) are all by direct water-cooling, to improve the allowable value of plasma current, it is by the coaxial top that places nozzle bore.Power supply (1) has just realized being simultaneously plasma arc (9) and MIG arc (15) power supply like this.Nozzle (7) is used for compressing plasma arc (9), and the diameter of its compressing hole less (5mm) is in order to produce stronger plasma-arc.Nozzle adopts heat conduction red copper making preferably, and a wire feed aperture (17) is arranged on the nozzle hole wall, and in order to the oblique consumable electrode of sending into, nozzle is used as the ignition tip of welding wire (14) again both as the compression plasma-arc.Nozzle and non-melt electrode all adopt the recirculated water direct water-cooling.(20), (21) are respectively water inlet pipe among the figure, and (22), (23) are respectively outlet pipe.(24), (25) are respectively ion gas (Ar) that produces plasma arc and the air inlet pipe of protecting gas (Ar or Ar+CO).Upper cutting gun (26) is made for insulating materials, in order to guarantee the insulation between non-melt electrode (6) and nozzle (7) and the whole lower gun body (18).Protective cover (27) is in order to carry peripheral protective gas.
The striking mode of single-power plasma MIG weldering adopts new type of safe high-frequency arc strike mode.The connection mode of its radio-frequency generator (5) is as figure, and arc process is as follows:
After cooling water, ion gas, protection gas all enter welding torch; Closing Switch (2) and (3); the floating voltage of the source of welding current (1) has been added between non-melt electrode (6) and the nozzle (7) together through the high frequency voltage that resistance (4) and radio-frequency generator (5) are taken place, and non-transfer type plasma arc between non-melt electrode (6) and the nozzle (7) ignites.After high frequency stops, Closing Switch (8), transfevent plasma arc (9) between non-melt electrode (6) and the workpiece (16) again ignites.Cut-off switch (2) and (3) then, cut off non-transfevent electric arc, Closing Switch (10), connect wire feeding motor (12), wire feed rolls (13) is sent into the wire feed hole (17) of consumable electrode (14) on the nozzle hole wall in the plasma arc (9), MIG arc between consumable electrode (14) and the workpiece (16) just ignites voluntarily, and two electric arcs burn simultaneously, begins normal single-power plasma MIG welding operation.Owing to adopt above-mentioned high-frequency arc strike mode, high-frequency discharge only takes place at an end of power supply, and high frequency voltage can not be added between power supply two ends, thereby has avoided power supply by the danger of high frequency breakdown.
Adopt single-power plasma MIG soldering method of the present invention to possess plasma and weld the dual characteristics that connects with plasma MIG welding.But square groove once welds two-sides forming to the steel plate below the 8mm, is particularly suitable for the back welding of thick steel sheet, also is a desirable method for the rapid welding of cut deal and pipe, can not only carry out single-run welding, also can carry out multi-pass welding and built-up welding.
Claims (3)
1, a kind of have two electrodes, by the high-frequency arc strike mode, MIG arc between the plasma arc that produces between non-melt electrode and the workpiece and consumable electrode and workpiece is worked simultaneously, MIG electric arc is in the plasma-consumable electrode gas protection welding method among the encirclement of plasma arc, it is characterized in that, only power for plasma-arc (9) and (15) two electric arcs of MIG electric arc simultaneously with a power supply (1); Nozzle bore (19) arranged concentric of non-melt electrode (6) and welding torch (18), plasma-arc burns between non-melt electrode (6) and workpiece (16); Consumable electrode (14) is oblique sending in the plasma arc (9) from the nozzle hole wall, and the MIG arc burning and is surrounded by plasma-arc between consumable electrode that links to each other with nozzle (14) and workpiece (16); Comprise a steep characteristic power supply (1) and current regulator (11) to the electric power system of two electric arc power supplies simultaneously with a power supply, one utmost point (negative pole) of power supply is divided into two-way, wherein one the tunnel links to each other with non-melt electrode (6), another road links to each other with nozzle (7) through current regulator (11), consumable electrode (14) after nozzle wall is drawn, oblique sending in the plasma arc; Another utmost point (positive pole) of power supply (1) directly links to each other with workpiece (16); Transfer electric current transfer device (11) gets final product the current potential of transfer welding wire and the size of MIG arc current.
2, method according to claim 1, it is characterized in that, described safe high-frequency arc strike mode is the non-transfer type plasma arc between non-melt electrode (6) and the nozzle (7) of igniting earlier, transfevent plasma arc (9) between non-melt pole (6) and the workpiece (16) again ignites, consumable electrode (14) is in case be admitted in the plasma arc, and the MIG arc between it and the workpiece promptly can ignite voluntarily; So that high-frequency discharge is only taken place at an end of power supply, can not cause the danger of high frequency breakdown to power supply.
3, a kind of welding torch by the described method of claim 1, non-melt electrode and nozzle all adopt direct water-cooling; The compression aperture of nozzle is less, with the compression plasma-arc, it is characterized in that, non-melt electrode places the nozzle bore top coaxially; One wire feed aperture (17) is arranged, in order to the oblique consumable electrode of sending on the water-cooled nozzle hole wall; Nozzle is used as the ignition tip of welding wire again both as the compression plasma-arc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88102665 CN1012044B (en) | 1988-05-12 | 1988-05-12 | Single-power plasma welding method with molten electrode protected by gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88102665 CN1012044B (en) | 1988-05-12 | 1988-05-12 | Single-power plasma welding method with molten electrode protected by gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1039202A CN1039202A (en) | 1990-01-31 |
| CN1012044B true CN1012044B (en) | 1991-03-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88102665 Expired CN1012044B (en) | 1988-05-12 | 1988-05-12 | Single-power plasma welding method with molten electrode protected by gas |
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| Country | Link |
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| CN (1) | CN1012044B (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10175073A (en) * | 1996-12-17 | 1998-06-30 | Sansha Electric Mfg Co Ltd | Plasma arc utilizing machine |
| JP2009208137A (en) * | 2008-03-06 | 2009-09-17 | Daihen Corp | Plasma mig welding method |
| JP2010155251A (en) * | 2008-12-26 | 2010-07-15 | Daihen Corp | Plasma gma welding method |
| JP5314463B2 (en) * | 2009-03-11 | 2013-10-16 | 株式会社ダイヘン | Arc termination control method for two-electrode arc welding |
| TWI409119B (en) * | 2009-07-30 | 2013-09-21 | Nippon Steel & Sumikin Welding | Insert-chip, plasma torch and plasma processing device |
| CN101817112A (en) * | 2010-05-17 | 2010-09-01 | 哈尔滨工业大学 | Single power supply single-surface serial double-TIG (Tungsten Inert Gas) arc welding method |
| CN102409337B (en) * | 2011-08-11 | 2014-05-07 | 哈尔滨工业大学 | Plasma cladding method and automatic cladding equipment for manufacturing wear resistant clad steel plate |
| MX352896B (en) | 2011-11-13 | 2017-12-13 | Victor Equipment Co | Gas diffuser for gmaw manual/robotic arc welding mig apparatus apparatus and method with such gas diffusor. |
| CN102554424B (en) * | 2012-03-02 | 2014-10-22 | 北京工业大学 | High energy density cluster pulse arc welding gun |
| CN103111728B (en) * | 2013-02-05 | 2015-12-09 | 北京工业大学 | Separate type constrained arc welding method |
| CN103192185A (en) * | 2013-03-21 | 2013-07-10 | 杨迎元 | Composite welding method for overlap joint |
| CN104801866A (en) * | 2015-04-24 | 2015-07-29 | 哈尔滨工业大学 | Plasma and gas metal arc welding composite welding device with simple structure |
| CN106270989A (en) * | 2016-09-23 | 2017-01-04 | 卓拓精密工具（苏州）有限公司 | A kind of metal cutting welding plasma arc device |
| CN106312264B (en) * | 2016-11-01 | 2019-09-20 | 辽宁石油化工大学 | The hybrid welding torch and its welding method of pulse MIC welding and TIG weldering |
| CN106624402A (en) * | 2017-02-07 | 2017-05-10 | 王长春 | Double heat source hybrid welding torch and welding method |
| CN107243688A (en) * | 2017-07-13 | 2017-10-13 | 艾洛益(杭州)材料科技有限公司 | A kind of pair of tungsten electrode arc couples TIG weldering devices |
| CN108608126B (en) * | 2018-04-03 | 2021-01-05 | 哈尔滨工程大学 | Plasma shunting consumable electrode arc welding device and welding method |
| CN108817611A (en) * | 2018-06-29 | 2018-11-16 | 山东大学 | It is a kind of to force to restrain type electric arc metal increasing material manufacturing device |
-
1988
- 1988-05-12 CN CN 88102665 patent/CN1012044B/en not_active Expired
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| Publication number | Publication date |
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| CN1039202A (en) | 1990-01-31 |
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